Merge commit 'rails/master'

62 files changed, 2595 insertions, 4019 deletions

diff --git a/actionmailer/test/fixtures/helpers/example_helper.rb b/actionmailer/test/fixtures/helpers/example_helper.rb
index d66927aa60..f6a6a49ced 100644
--- a/actionmailer/test/fixtures/helpers/example_helper.rb
+++ b/actionmailer/test/fixtures/helpers/example_helper.rb
@@ -1,5 +1,5 @@
 module ExampleHelper
   def example_format(text)
-    "<em><strong><small>#{text}</small></strong></em>"
+    "<em><strong><small>#{h(text)}</small></strong></em>".html_safe!
   end
 end
diff --git a/actionpack/Gemfile b/actionpack/Gemfile
index 60d24104d2..8ee7026f05 100644
--- a/actionpack/Gemfile
+++ b/actionpack/Gemfile
@@ -1,5 +1,7 @@
 rails_root = Pathname.new(File.dirname(__FILE__)).join("..")
 
+Gem.sources.each { |uri| source uri }
+
 gem "rack", "~> 1.0.0"
 gem "rack-test", "~> 0.5.0"
 gem "activesupport", "3.0.pre", :vendored_at => rails_root.join("activesupport")
diff --git a/actionpack/lib/abstract_controller/callbacks.rb b/actionpack/lib/abstract_controller/callbacks.rb
index 379eaf6d8e..ee496dadc5 100644
--- a/actionpack/lib/abstract_controller/callbacks.rb
+++ b/actionpack/lib/abstract_controller/callbacks.rb
@@ -1,13 +1,11 @@
-require "active_support/new_callbacks"
-
 module AbstractController
   module Callbacks
     extend ActiveSupport::Concern
 
-    # Uses ActiveSupport::NewCallbacks as the base functionality. For
+    # Uses ActiveSupport::Callbacks as the base functionality. For
     # more details on the whole callback system, read the documentation
-    # for ActiveSupport::NewCallbacks.
-    include ActiveSupport::NewCallbacks
+    # for ActiveSupport::Callbacks.
+    include ActiveSupport::Callbacks
 
     included do
       define_callbacks :process_action, :terminator => "response_body"
@@ -16,7 +14,7 @@ module AbstractController
     # Override AbstractController::Base's process_action to run the
     # process_action callbacks around the normal behavior.
     def process_action(method_name)
-      _run_process_action_callbacks(method_name) do
+      run_callbacks(:process_action, method_name) do
         super
       end
     end
diff --git a/actionpack/lib/action_controller/metal/session_management.rb b/actionpack/lib/action_controller/metal/session_management.rb
index ffce8e1bd1..654aa08cd3 100644
--- a/actionpack/lib/action_controller/metal/session_management.rb
+++ b/actionpack/lib/action_controller/metal/session_management.rb
@@ -16,7 +16,7 @@ module ActionController #:nodoc:
           self.session_store = ActiveRecord::SessionStore
         else
           @@session_store = store.is_a?(Symbol) ?
-            Session.const_get(store.to_s.camelize) :
+            ActionDispatch::Session.const_get(store.to_s.camelize) :
             store
         end
       end
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index cc989d6625..e85823d8db 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -10,7 +10,12 @@ module Mime
     %w(<< concat shift unshift push pop []= clear compact! collect!
     delete delete_at delete_if flatten! map! insert reject! reverse!
     replace slice! sort! uniq!).each do |method|
-      define_method(method) {|*args| @symbols = nil; super(*args) }
+      module_eval <<-CODE
+        def #{method}(*args)
+          @symbols = nil
+          super
+        end
+      CODE
     end
   end
 
diff --git a/actionpack/lib/action_dispatch/middleware/callbacks.rb b/actionpack/lib/action_dispatch/middleware/callbacks.rb
index 56d6da1706..49bc20f11f 100644
--- a/actionpack/lib/action_dispatch/middleware/callbacks.rb
+++ b/actionpack/lib/action_dispatch/middleware/callbacks.rb
@@ -1,6 +1,6 @@
 module ActionDispatch
   class Callbacks
-    include ActiveSupport::NewCallbacks
+    include ActiveSupport::Callbacks
 
     define_callbacks :call, :terminator => "result == false", :rescuable => true
     define_callbacks :prepare, :scope => :name
@@ -37,12 +37,12 @@ module ActionDispatch
 
     def initialize(app, prepare_each_request = false)
       @app, @prepare_each_request = app, prepare_each_request
-      _run_prepare_callbacks
+      run_callbacks(:prepare)
     end
 
     def call(env)
-      _run_call_callbacks do
-        _run_prepare_callbacks if @prepare_each_request
+      run_callbacks(:call) do
+        run_callbacks(:prepare) if @prepare_each_request
         @app.call(env)
       end
     end
diff --git a/actionpack/lib/action_view/base.rb b/actionpack/lib/action_view/base.rb
index 82b419d846..31e9c5ef9d 100644
--- a/actionpack/lib/action_view/base.rb
+++ b/actionpack/lib/action_view/base.rb
@@ -236,15 +236,15 @@ module ActionView #:nodoc:
       # they are in AC.
       if controller.class.respond_to?(:_helper_serial)
         klass = @views[controller.class._helper_serial] ||= Class.new(self) do
-          name = controller.class.name.gsub(/::/, '__')
-
-          Subclasses.class_eval do
-            if method(:const_defined?).arity == 1
-              remove_const(name) if const_defined?(name)        # Ruby 1.8.x
-            else
-              remove_const(name) if const_defined?(name, false) # Ruby 1.9.x
-            end
-            const_set(name, self)
+          const_set(:CONTROLLER_CLASS, controller.class)
+
+          # Try to make stack traces clearer
+          def self.name
+            "ActionView for #{CONTROLLER_CLASS}"
+          end
+
+          def inspect
+            "#<#{self.class.name}>"
           end
 
           if controller.respond_to?(:_helpers)
diff --git a/actionpack/lib/action_view/helpers/record_tag_helper.rb b/actionpack/lib/action_view/helpers/record_tag_helper.rb
index 0cdb70e217..31411dc08a 100644
--- a/actionpack/lib/action_view/helpers/record_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/record_tag_helper.rb
@@ -15,7 +15,7 @@ module ActionView
       def div_for(record, *args, &block)
         content_tag_for(:div, record, *args, &block)
       end
-  
+
       # content_tag_for creates an HTML element with id and class parameters
       # that relate to the specified Active Record object. For example:
       #
@@ -34,7 +34,7 @@ module ActionView
       #    <% content_tag_for(:tr, @person, :foo) do %> ...
       #
       # produces:
-      #    
+      #
       #    <tr id="foo_person_123" class="person">...
       #
       # content_tag_for also accepts a hash of options, which will be converted to
@@ -50,7 +50,7 @@ module ActionView
       def content_tag_for(tag_name, record, *args, &block)
         prefix  = args.first.is_a?(Hash) ? nil : args.shift
         options = args.extract_options!
-        options.merge!({ :class => "#{dom_class(record)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
+        options.merge!({ :class => "#{dom_class(record, prefix)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
         content_tag(tag_name, options, &block)
       end
     end
diff --git a/actionpack/lib/action_view/paths.rb b/actionpack/lib/action_view/paths.rb
index 5524a3219a..23bde61f9c 100644
--- a/actionpack/lib/action_view/paths.rb
+++ b/actionpack/lib/action_view/paths.rb
@@ -1,8 +1,11 @@
 module ActionView #:nodoc:
   class PathSet < Array #:nodoc:
-    def self.type_cast(obj)
+    def self.type_cast(obj, cache = nil)
+      # TODO: Clean this up
       if obj.is_a?(String)
-        cache = !defined?(Rails) || !Rails.respond_to?(:configuration) || Rails.configuration.cache_classes
+        if cache.nil?
+          cache = !defined?(Rails) || Rails.application.config.cache_classes
+        end
         FileSystemResolverWithFallback.new(obj, :cache => cache)
       else
         obj
diff --git a/actionpack/lib/action_view/render/partials.rb b/actionpack/lib/action_view/render/partials.rb
index 4f60566a09..2eb88ae3e5 100644
--- a/actionpack/lib/action_view/render/partials.rb
+++ b/actionpack/lib/action_view/render/partials.rb
@@ -296,7 +296,10 @@ module ActionView
       end
       
       def _find_template(path)
-        prefix = @view.controller.controller_path unless path.include?(?/)
+        if controller = @view.controller
+          prefix = controller.controller_path unless path.include?(?/)
+        end
+
         @view.find(path, {:formats => @view.formats}, prefix, true)
       end
 
diff --git a/actionpack/lib/action_view/render/rendering.rb b/actionpack/lib/action_view/render/rendering.rb
index 0cab035ede..b6f5b9b6d1 100644
--- a/actionpack/lib/action_view/render/rendering.rb
+++ b/actionpack/lib/action_view/render/rendering.rb
@@ -14,6 +14,7 @@ module ActionView
       case options
       when Hash
         layout = options[:layout]
+        options[:locals] ||= {}
 
         if block_given?
           return concat(_render_partial(options.merge(:partial => layout), &block))
@@ -25,11 +26,11 @@ module ActionView
 
         if file = options[:file]
           template = find(file, {:formats => formats})
-          _render_template(template, layout, :locals => options[:locals] || {})
+          _render_template(template, layout, :locals => options[:locals])
         elsif inline = options[:inline]
           _render_inline(inline, layout, options)
         elsif text = options[:text]
-          _render_text(text, layout, options)
+          _render_text(text, layout, options[:locals])
         end
       when :update
         update_page(&block)
@@ -80,16 +81,19 @@ module ActionView
 
     def _render_inline(inline, layout, options)
       handler = Template.handler_class_for_extension(options[:type] || "erb")
-      template = Template.new(options[:inline], "inline #{options[:inline].inspect}", handler, {})
-      locals = options[:locals] || {}
+      template = Template.new(options[:inline],
+        "inline #{options[:inline].inspect}", handler, {})
+
+      locals = options[:locals]
       content = template.render(self, locals)
-      content = layout.render(self, locals) {|*name| _layout_for(*name) { content } } if layout
-      content
+      _render_text(content, layout, locals)
     end
 
-    def _render_text(text, layout, options)
-      text = layout.render(self, options[:locals]) { text } if layout
-      text
+    def _render_text(content, layout, locals)
+      content = layout.render(self, locals) do |*name|
+        _layout_for(*name) { content }
+      end if layout
+      content
     end
 
     # This is the API to render a ViewContext's template from a controller.
diff --git a/actionpack/test/controller/routing_test.rb b/actionpack/test/controller/routing_test.rb
index edf243337f..7c88520bac 100644
--- a/actionpack/test/controller/routing_test.rb
+++ b/actionpack/test/controller/routing_test.rb
@@ -240,18 +240,6 @@ class LegacyRouteSetTests < Test::Unit::TestCase
                  x.send(:home_url))
   end
 
-  def test_basic_named_route_with_relative_url_root
-    rs.draw do |map|
-      map.home '', :controller => 'content', :action => 'list'
-    end
-    x = setup_for_named_route
-    ActionController::Base.relative_url_root = "/foo"
-    assert_equal("http://test.host/foo/",
-                 x.send(:home_url))
-    assert_equal "/foo/", x.send(:home_path)
-    ActionController::Base.relative_url_root = nil
-  end
-
   def test_named_route_with_option
     rs.draw do |map|
       map.page 'page/:title', :controller => 'content', :action => 'show_page'
@@ -307,19 +295,6 @@ class LegacyRouteSetTests < Test::Unit::TestCase
                  x.send(:users_url))
   end
 
-  def test_optimised_named_route_call_never_uses_url_for
-    rs.draw do |map|
-      map.users 'admin/user', :controller => '/admin/user', :action => 'index'
-      map.user 'admin/user/:id', :controller=>'/admin/user', :action=>'show'
-    end
-    x = setup_for_named_route
-    x.expects(:url_for).never
-    x.send(:users_url)
-    x.send(:users_path)
-    x.send(:user_url, 2, :foo=>"bar")
-    x.send(:user_path, 3, :bar=>"foo")
-  end
-
   def test_optimised_named_route_with_host
     rs.draw do |map|
       map.pages 'pages', :controller => 'content', :action => 'show_page', :host => 'foo.com'
@@ -984,9 +959,6 @@ class RouteSetTest < ActiveSupport::TestCase
       end
 
       assert_equal 1, set.routes.size
-      route = set.routes.first
-
-      assert route.segments.last.optional?
 
       assert_equal '/users/show/10', set.generate(:controller => 'users', :action => 'show', :id => 10)
       assert_equal '/users/index/10', set.generate(:controller => 'users', :id => 10)
diff --git a/actionpack/test/lib/controller/fake_controllers.rb b/actionpack/test/lib/controller/fake_controllers.rb
index 9ec7f330b8..c993836a61 100644
--- a/actionpack/test/lib/controller/fake_controllers.rb
+++ b/actionpack/test/lib/controller/fake_controllers.rb
@@ -7,6 +7,7 @@ module Admin
   class << self; alias_method :const_available?, :const_defined?; end
   class UserController < ActionController::Base; end
   class NewsFeedController < ActionController::Base; end
+  class StuffController < ActionController::Base; end
 end
 
 module Api
@@ -26,6 +27,7 @@ class HiController < ActionController::Base; end
 class ImageController < ActionController::Base; end
 class PeopleController < ActionController::Base; end
 class SessionsController  < ActionController::Base; end
+class StuffController < ActionController::Base; end
 class SubpathBooksController < ActionController::Base; end
 class WeblogController < ActionController::Base; end
 
diff --git a/actionpack/test/template/record_tag_helper_test.rb b/actionpack/test/template/record_tag_helper_test.rb
index 77d1374020..1cd18c0692 100644
--- a/actionpack/test/template/record_tag_helper_test.rb
+++ b/actionpack/test/template/record_tag_helper_test.rb
@@ -27,7 +27,7 @@ class RecordTagHelperTest < ActionView::TestCase
   end
 
   def test_content_tag_for_prefix
-    expected = %(<ul class="post" id="archived_post_45"></ul>)
+    expected = %(<ul class="archived_post" id="archived_post_45"></ul>)
     actual = content_tag_for(:ul, @post, :archived) { }
     assert_dom_equal expected, actual
   end
diff --git a/actionpack/test/view/safe_buffer_test.rb b/actionpack/test/template/safe_buffer_test.rb
index 2236709627..6a18201d16 100644
--- a/actionpack/test/view/safe_buffer_test.rb
+++ b/actionpack/test/template/safe_buffer_test.rb
@@ -26,7 +26,7 @@ class SafeBufferTest < ActionView::TestCase
   end
 
   test "Should not mess with a previously escape test" do
-    @buffer << CGI.escapeHTML("<script>")
+    @buffer << ERB::Util.html_escape("<script>")
     assert_equal "&lt;script&gt;", @buffer
   end
 
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index edeb508a08..0f178a07c8 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -1,12 +1,10 @@
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/hash/keys'
-require 'active_support/concern'
-require 'active_support/callbacks'
 
 module ActiveModel
   module Validations
     extend ActiveSupport::Concern
-    include ActiveSupport::NewCallbacks
+    include ActiveSupport::Callbacks
 
     included do
       define_callbacks :validate, :scope => :name
@@ -99,7 +97,7 @@ module ActiveModel
     def invalid?
       !valid?
     end
-    
+
     protected
       # Hook method defining how an attribute value should be retieved. By default this is assumed
       # to be an instance named after the attribute. Override this method in subclasses should you
@@ -110,9 +108,9 @@ module ActiveModel
       #     def initialize(data = {})
       #       @data = data
       #     end
-      #     
+      #
       #     private
-      #     
+      #
       #     def read_attribute_for_validation(key)
       #       @data[key]
       #     end
diff --git a/activerecord/lib/active_record/associations/association_collection.rb b/activerecord/lib/active_record/associations/association_collection.rb
index 1b7bf42b91..25e329c0c1 100644
--- a/activerecord/lib/active_record/associations/association_collection.rb
+++ b/activerecord/lib/active_record/associations/association_collection.rb
@@ -476,7 +476,7 @@ module ActiveRecord
 
         def callback(method, record)
           callbacks_for(method).each do |callback|
-            ActiveSupport::Callbacks::Callback.new(method, callback, record).call(@owner, record)
+            ActiveSupport::DeprecatedCallbacks::Callback.new(method, callback, record).call(@owner, record)
           end
         end
 
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb
index 40a25811c4..b25893a1c3 100644
--- a/activerecord/lib/active_record/callbacks.rb
+++ b/activerecord/lib/active_record/callbacks.rb
@@ -20,7 +20,7 @@ module ActiveRecord
   # * (6) <tt>after_save</tt>
   #
   # That's a total of eight callbacks, which gives you immense power to react and prepare for each state in the
-  # Active Record lifecycle. The sequence for calling <tt>Base#save</tt> for an existing record is similar, except that each 
+  # Active Record lifecycle. The sequence for calling <tt>Base#save</tt> for an existing record is similar, except that each
   # <tt>_on_create</tt> callback is replaced by the corresponding <tt>_on_update</tt> callback.
   #
   # Examples:
@@ -210,7 +210,7 @@ module ActiveRecord
   # instead of quietly returning +false+.
   module Callbacks
     extend ActiveSupport::Concern
-    include ActiveSupport::NewCallbacks
+    include ActiveSupport::Callbacks
 
     CALLBACKS = [
       :after_initialize, :after_find, :before_validation, :after_validation,
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 78c7a4b697..cdf0aebfee 100755
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -32,7 +32,7 @@ module ActiveRecord
     class AbstractAdapter
       include Quoting, DatabaseStatements, SchemaStatements
       include QueryCache
-      include ActiveSupport::Callbacks
+      include ActiveSupport::DeprecatedCallbacks
       define_callbacks :checkout, :checkin
 
       @@row_even = true
@@ -75,7 +75,7 @@ module ActiveRecord
       def supports_ddl_transactions?
         false
       end
-      
+
       # Does this adapter support savepoints? PostgreSQL and MySQL do, SQLite
       # does not.
       def supports_savepoints?
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index ec6c02db38..edcf547e01 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -3,11 +3,14 @@ require 'active_support/core_ext/object/try'
 
 module ActiveRecord
   module NestedAttributes #:nodoc:
+    class TooManyRecords < ActiveRecordError
+    end
+
     extend ActiveSupport::Concern
 
     included do
-      class_inheritable_accessor :reject_new_nested_attributes_procs, :instance_writer => false
-      self.reject_new_nested_attributes_procs = {}
+      class_inheritable_accessor :nested_attributes_options, :instance_writer => false
+      self.nested_attributes_options = {}
     end
 
     # == Nested Attributes
@@ -203,6 +206,12 @@ module ActiveRecord
       #   do not have a <tt>_destroy</tt> value that evaluates to true.
       #   Passing <tt>:all_blank</tt> instead of a Proc will create a proc
       #   that will reject a record where all the attributes are blank.
+      # [:limit]
+      #   Allows you to specify the maximum number of the associated records that
+      #   can be processes with the nested attributes. If the size of the
+      #   nested attributes array exceeds the specified limit, NestedAttributes::TooManyRecords
+      #   exception is raised. If omitted, any number associations can be processed.
+      #   Note that the :limit option is only applicable to one-to-many associations.
       #
       # Examples:
       #   # creates avatar_attributes=
@@ -214,7 +223,7 @@ module ActiveRecord
       def accepts_nested_attributes_for(*attr_names)
         options = { :allow_destroy => false }
         options.update(attr_names.extract_options!)
-        options.assert_valid_keys(:allow_destroy, :reject_if)
+        options.assert_valid_keys(:allow_destroy, :reject_if, :limit)
 
         attr_names.each do |association_name|
           if reflection = reflect_on_association(association_name)
@@ -227,10 +236,10 @@ module ActiveRecord
 
             reflection.options[:autosave] = true
 
-            self.reject_new_nested_attributes_procs[association_name.to_sym] = if options[:reject_if] == :all_blank
-              proc { |attributes| attributes.all? {|k,v| v.blank?} }
-            else
-              options[:reject_if]
+            self.nested_attributes_options[association_name.to_sym] = options
+
+            if options[:reject_if] == :all_blank
+              self.nested_attributes_options[association_name.to_sym][:reject_if] = proc { |attributes| attributes.all? {|k,v| v.blank?} }
             end
 
             # def pirate_attributes=(attributes)
@@ -238,7 +247,7 @@ module ActiveRecord
             # end
             class_eval %{
               def #{association_name}_attributes=(attributes)
-                assign_nested_attributes_for_#{type}_association(:#{association_name}, attributes, #{options[:allow_destroy]})
+                assign_nested_attributes_for_#{type}_association(:#{association_name}, attributes)
               end
             }, __FILE__, __LINE__
           else
@@ -282,7 +291,8 @@ module ActiveRecord
     # If the given attributes include a matching <tt>:id</tt> attribute _and_ a
     # <tt>:_destroy</tt> key set to a truthy value, then the existing record
     # will be marked for destruction.
-    def assign_nested_attributes_for_one_to_one_association(association_name, attributes, allow_destroy)
+    def assign_nested_attributes_for_one_to_one_association(association_name, attributes)
+      options = self.nested_attributes_options[association_name]
       attributes = attributes.with_indifferent_access
 
       if attributes['id'].blank?
@@ -295,7 +305,7 @@ module ActiveRecord
           end
         end
       elsif (existing_record = send(association_name)) && existing_record.id.to_s == attributes['id'].to_s
-        assign_to_or_mark_for_destruction(existing_record, attributes, allow_destroy)
+        assign_to_or_mark_for_destruction(existing_record, attributes, options[:allow_destroy])
       end
     end
 
@@ -326,11 +336,17 @@ module ActiveRecord
     #     { :name => 'John' },
     #     { :id => '2', :_destroy => true }
     #   ])
-    def assign_nested_attributes_for_collection_association(association_name, attributes_collection, allow_destroy)
+    def assign_nested_attributes_for_collection_association(association_name, attributes_collection)
+      options = self.nested_attributes_options[association_name]
+
       unless attributes_collection.is_a?(Hash) || attributes_collection.is_a?(Array)
         raise ArgumentError, "Hash or Array expected, got #{attributes_collection.class.name} (#{attributes_collection.inspect})"
       end
 
+      if options[:limit] && attributes_collection.size > options[:limit]
+        raise TooManyRecords, "Maximum #{options[:limit]} records are allowed. Got #{attributes_collection.size} records instead."
+      end
+
       if attributes_collection.is_a? Hash
         attributes_collection = attributes_collection.sort_by { |index, _| index.to_i }.map { |_, attributes| attributes }
       end
@@ -343,7 +359,7 @@ module ActiveRecord
             send(association_name).build(attributes.except(*UNASSIGNABLE_KEYS))
           end
         elsif existing_record = send(association_name).detect { |record| record.id.to_s == attributes['id'].to_s }
-          assign_to_or_mark_for_destruction(existing_record, attributes, allow_destroy)
+          assign_to_or_mark_for_destruction(existing_record, attributes, options[:allow_destroy])
         end
       end
     end
@@ -372,7 +388,7 @@ module ActiveRecord
     end
 
     def call_reject_if(association_name, attributes)
-      callback = self.class.reject_new_nested_attributes_procs[association_name]
+      callback = self.nested_attributes_options[association_name][:reject_if]
 
       case callback
       when Symbol
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb
index ab79b520a2..e61b253192 100644
--- a/activerecord/lib/active_record/validations.rb
+++ b/activerecord/lib/active_record/validations.rb
@@ -59,15 +59,15 @@ module ActiveRecord
     end
 
     # Translates an error message in it's default scope (<tt>activerecord.errrors.messages</tt>).
-    # Error messages are first looked up in <tt>models.MODEL.attributes.ATTRIBUTE.MESSAGE</tt>, if it's not there, 
-    # it's looked up in <tt>models.MODEL.MESSAGE</tt> and if that is not there it returns the translation of the 
-    # default message (e.g. <tt>activerecord.errors.messages.MESSAGE</tt>). The translated model name, 
+    # Error messages are first looked up in <tt>models.MODEL.attributes.ATTRIBUTE.MESSAGE</tt>, if it's not there,
+    # it's looked up in <tt>models.MODEL.MESSAGE</tt> and if that is not there it returns the translation of the
+    # default message (e.g. <tt>activerecord.errors.messages.MESSAGE</tt>). The translated model name,
     # translated attribute name and the value are available for interpolation.
     #
     # When using inheritance in your models, it will check all the inherited models too, but only if the model itself
     # hasn't been found. Say you have <tt>class Admin < User; end</tt> and you wanted the translation for the <tt>:blank</tt>
     # error +message+ for the <tt>title</tt> +attribute+, it looks for these translations:
-    # 
+    #
     # <ol>
     # <li><tt>activerecord.errors.models.admin.attributes.title.blank</tt></li>
     # <li><tt>activerecord.errors.models.admin.blank</tt></li>
@@ -80,10 +80,10 @@ module ActiveRecord
       message, options[:default] = options[:default], message if options[:default].is_a?(Symbol)
 
       defaults = @base.class.self_and_descendants_from_active_record.map do |klass|
-        [ :"models.#{klass.name.underscore}.attributes.#{attribute}.#{message}", 
+        [ :"models.#{klass.name.underscore}.attributes.#{attribute}.#{message}",
           :"models.#{klass.name.underscore}.#{message}" ]
       end
-      
+
       defaults << options.delete(:default)
       defaults = defaults.compact.flatten << :"messages.#{message}"
 
@@ -104,7 +104,7 @@ module ActiveRecord
   module Validations
     extend ActiveSupport::Concern
 
-    include ActiveSupport::Callbacks
+    include ActiveSupport::DeprecatedCallbacks
     include ActiveModel::Validations
 
     included do
diff --git a/activerecord/test/cases/nested_attributes_test.rb b/activerecord/test/cases/nested_attributes_test.rb
index e57e361520..53fd168e1b 100644
--- a/activerecord/test/cases/nested_attributes_test.rb
+++ b/activerecord/test/cases/nested_attributes_test.rb
@@ -29,13 +29,13 @@ class TestNestedAttributesInGeneral < ActiveRecord::TestCase
     Pirate.accepts_nested_attributes_for :ship, :allow_destroy => true, :reject_if => proc { |attributes| attributes.empty? }
   end
 
-  def test_base_should_have_an_empty_reject_new_nested_attributes_procs
-    assert_equal Hash.new, ActiveRecord::Base.reject_new_nested_attributes_procs
+  def test_base_should_have_an_empty_nested_attributes_options
+    assert_equal Hash.new, ActiveRecord::Base.nested_attributes_options
   end
 
-  def test_should_add_a_proc_to_reject_new_nested_attributes_procs
+  def test_should_add_a_proc_to_nested_attributes_options
     [:parrots, :birds, :birds_with_reject_all_blank].each do |name|
-      assert_instance_of Proc, Pirate.reject_new_nested_attributes_procs[name]
+      assert_instance_of Proc, Pirate.nested_attributes_options[name][:reject_if]
     end
   end
 
@@ -603,3 +603,33 @@ class TestNestedAttributesOnAHasAndBelongsToManyAssociation < ActiveRecord::Test
 
   include NestedAttributesOnACollectionAssociationTests
 end
+
+class TestNestedAttributesLimit < ActiveRecord::TestCase
+  def setup
+    Pirate.accepts_nested_attributes_for :parrots, :limit => 2
+
+    @pirate = Pirate.create!(:catchphrase => "Don' botharrr talkin' like one, savvy?")
+  end
+
+  def teardown
+    Pirate.accepts_nested_attributes_for :parrots, :allow_destroy => true, :reject_if => proc { |attributes| attributes.empty? }
+  end
+
+  def test_limit_with_less_records
+    @pirate.attributes = { :parrots_attributes => { 'foo' => { :name => 'Big Big Love' } } }
+    assert_difference('Parrot.count') { @pirate.save! }
+  end
+
+  def test_limit_with_number_exact_records
+    @pirate.attributes = { :parrots_attributes => { 'foo' => { :name => 'Lovely Day' }, 'bar' => { :name => 'Blown Away' } } }
+    assert_difference('Parrot.count', 2) { @pirate.save! }
+  end
+
+  def test_limit_with_exceeding_records
+    assert_raises(ActiveRecord::NestedAttributes::TooManyRecords) do
+      @pirate.attributes = { :parrots_attributes => { 'foo' => { :name => 'Lovely Day' },
+                                                      'bar' => { :name => 'Blown Away' },
+                                                      'car' => { :name => 'The Happening' }} }
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/autoload.rb b/activesupport/lib/active_support/autoload.rb
index 423d5448c3..71f4b395ce 100644
--- a/activesupport/lib/active_support/autoload.rb
+++ b/activesupport/lib/active_support/autoload.rb
@@ -8,6 +8,7 @@ module ActiveSupport
   autoload :Concern, 'active_support/concern'
   autoload :ConcurrentHash, 'active_support/concurrent_hash'
   autoload :DependencyModule, 'active_support/dependency_module'
+  autoload :DeprecatedCallbacks, 'active_support/deprecated_callbacks'
   autoload :Deprecation, 'active_support/deprecation'
   autoload :Gzip, 'active_support/gzip'
   autoload :Inflector, 'active_support/inflector'
@@ -15,7 +16,6 @@ module ActiveSupport
   autoload :MessageEncryptor, 'active_support/message_encryptor'
   autoload :MessageVerifier, 'active_support/message_verifier'
   autoload :Multibyte, 'active_support/multibyte'
-  autoload :NewCallbacks, 'active_support/new_callbacks'
   autoload :OptionMerger, 'active_support/option_merger'
   autoload :Orchestra, 'active_support/orchestra'
   autoload :OrderedHash, 'active_support/ordered_hash'
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 25f9555388..a415686020 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -115,6 +115,13 @@ module ActiveSupport
         self
       end
 
+      def mute
+        previous_silence, @silence = defined?(@silence) && @silence, true
+        yield
+      ensure
+        @silence = previous_silence
+      end
+
       # Fetches data from the cache, using the given key. If there is data in
       # the cache with the given key, then that data is returned.
       #
diff --git a/activesupport/lib/active_support/cache/memory_store.rb b/activesupport/lib/active_support/cache/memory_store.rb
index 66ce1bc93a..e6085d97ec 100644
--- a/activesupport/lib/active_support/cache/memory_store.rb
+++ b/activesupport/lib/active_support/cache/memory_store.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/object/duplicable'
+
 module ActiveSupport
   module Cache
     # A cache store implementation which stores everything into memory in the
diff --git a/activesupport/lib/active_support/cache/strategy/local_cache.rb b/activesupport/lib/active_support/cache/strategy/local_cache.rb
index 3b5fccc737..5f6fe22416 100644
--- a/activesupport/lib/active_support/cache/strategy/local_cache.rb
+++ b/activesupport/lib/active_support/cache/strategy/local_cache.rb
@@ -44,7 +44,7 @@ module ActiveSupport
             nil
           elsif value.nil?
             value = super
-            local_cache.write(key, value || NULL) if local_cache
+            local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
             value.duplicable? ? value.dup : value
           else
             # forcing the value to be immutable
@@ -54,12 +54,12 @@ module ActiveSupport
 
         def write(key, value, options = nil)
           value = value.to_s if respond_to?(:raw?) && raw?(options)
-          local_cache.write(key, value || NULL) if local_cache
+          local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
           super
         end
 
         def delete(key, options = nil)
-          local_cache.write(key, NULL) if local_cache
+          local_cache.mute { local_cache.write(key, NULL) } if local_cache
           super
         end
 
@@ -76,7 +76,7 @@ module ActiveSupport
 
         def increment(key, amount = 1)
           if value = super
-            local_cache.write(key, value.to_s) if local_cache
+            local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
             value
           else
             nil
@@ -85,7 +85,7 @@ module ActiveSupport
 
         def decrement(key, amount = 1)
           if value = super
-            local_cache.write(key, value.to_s) if local_cache
+            local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
             value
           else
             nil
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 238d1b6804..21388d7a58 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -1,4 +1,6 @@
-require 'active_support/core_ext/array/extract_options'
+require 'active_support/core_ext/array/wrap'
+require 'active_support/core_ext/class/inheritable_attributes'
+require 'active_support/core_ext/kernel/reporting'
 
 module ActiveSupport
   # Callbacks are hooks into the lifecycle of an object that allow you to trigger logic
@@ -10,23 +12,23 @@ module ActiveSupport
   #   class Storage
   #     include ActiveSupport::Callbacks
   #
-  #     define_callbacks :before_save, :after_save
+  #     define_callbacks :save
   #   end
   #
   #   class ConfigStorage < Storage
-  #     before_save :saving_message
+  #     set_callback :save, :before, :saving_message
   #     def saving_message
   #       puts "saving..."
   #     end
   #
-  #     after_save do |object|
+  #     set_callback :save, :after do |object|
   #       puts "saved"
   #     end
   #
   #     def save
-  #       run_callbacks(:before_save)
-  #       puts "- save"
-  #       run_callbacks(:after_save)
+  #       run_callbacks :save do
+  #         puts "- save"
+  #       end
   #     end
   #   end
   #
@@ -44,28 +46,28 @@ module ActiveSupport
   #   class Storage
   #     include ActiveSupport::Callbacks
   #
-  #     define_callbacks :before_save, :after_save
+  #     define_callbacks :save
   #
-  #     before_save :prepare
+  #     set_callback :save, :before, :prepare
   #     def prepare
   #       puts "preparing save"
   #     end
   #   end
   #
   #   class ConfigStorage < Storage
-  #     before_save :saving_message
+  #     set_callback :save, :before, :saving_message
   #     def saving_message
   #       puts "saving..."
   #     end
   #
-  #     after_save do |object|
+  #     set_callback :save, :after do |object|
   #       puts "saved"
   #     end
   #
   #     def save
-  #       run_callbacks(:before_save)
-  #       puts "- save"
-  #       run_callbacks(:after_save)
+  #       run_callbacks :save do
+  #         puts "- save"
+  #       end
   #     end
   #   end
   #
@@ -77,205 +79,485 @@ module ActiveSupport
   #   saving...
   #   - save
   #   saved
+  #
   module Callbacks
-    class CallbackChain < Array
-      def self.build(kind, *methods, &block)
-        methods, options = extract_options(*methods, &block)
-        methods.map! { |method| Callback.new(kind, method, options) }
-        new(methods)
+    def self.included(klass)
+      klass.extend ClassMethods
+    end
+
+    def run_callbacks(kind, *args, &block)
+      send("_run_#{kind}_callbacks", *args, &block)
+    end
+
+    class Callback
+      @@_callback_sequence = 0
+
+      attr_accessor :chain, :filter, :kind, :options, :per_key, :klass
+
+      def initialize(chain, filter, kind, options, klass)
+        @chain, @kind, @klass = chain, kind, klass
+        normalize_options!(options)
+
+        @per_key              = options.delete(:per_key)
+        @raw_filter, @options = filter, options
+        @filter               = _compile_filter(filter)
+        @compiled_options     = _compile_options(options)
+        @callback_id          = next_id
+
+        _compile_per_key_options
+      end
+
+      def clone(chain, klass)
+        obj                  = super()
+        obj.chain            = chain
+        obj.klass            = klass
+        obj.per_key          = @per_key.dup
+        obj.options          = @options.dup
+        obj.per_key[:if]     = @per_key[:if].dup
+        obj.per_key[:unless] = @per_key[:unless].dup
+        obj.options[:if]     = @options[:if].dup
+        obj.options[:unless] = @options[:unless].dup
+        obj
       end
 
-      def run(object, options = {}, &terminator)
-        enumerator = options[:enumerator] || :each
+      def normalize_options!(options)
+        options[:if] = Array.wrap(options[:if])
+        options[:unless] = Array.wrap(options[:unless])
 
-        unless block_given?
-          send(enumerator) { |callback| callback.call(object) }
-        else
-          send(enumerator) do |callback|
-            result = callback.call(object)
-            break result if terminator.call(result, object)
+        options[:per_key] ||= {}
+        options[:per_key][:if] = Array.wrap(options[:per_key][:if])
+        options[:per_key][:unless] = Array.wrap(options[:per_key][:unless])
+      end
+
+      def name
+        chain.name
+      end
+
+      def next_id
+        @@_callback_sequence += 1
+      end
+
+      def matches?(_kind, _filter)
+        @kind == _kind && @filter == _filter
+      end
+
+      def _update_filter(filter_options, new_options)
+        filter_options[:if].push(new_options[:unless]) if new_options.key?(:unless)
+        filter_options[:unless].push(new_options[:if]) if new_options.key?(:if)
+      end
+
+      def recompile!(_options, _per_key)
+        _update_filter(self.options, _options)
+        _update_filter(self.per_key, _per_key)
+
+        @callback_id      = next_id
+        @filter           = _compile_filter(@raw_filter)
+        @compiled_options = _compile_options(@options)
+                            _compile_per_key_options
+      end
+
+      def _compile_per_key_options
+        key_options  = _compile_options(@per_key)
+
+        @klass.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+          def _one_time_conditions_valid_#{@callback_id}?
+            true #{key_options[0]}
           end
-        end
+        RUBY_EVAL
       end
 
-      # TODO: Decompose into more Array like behavior
-      def replace_or_append!(chain)
-        if index = index(chain)
-          self[index] = chain
-        else
-          self << chain
+      # This will supply contents for before and around filters, and no
+      # contents for after filters (for the forward pass).
+      def start(key=nil, object=nil)
+        return if key && !object.send("_one_time_conditions_valid_#{@callback_id}?")
+
+        # options[0] is the compiled form of supplied conditions
+        # options[1] is the "end" for the conditional
+        #
+        if @kind == :before || @kind == :around
+          if @kind == :before
+            # if condition    # before_save :filter_name, :if => :condition
+            #   filter_name
+            # end
+            filter = <<-RUBY_EVAL
+              unless halted
+                result = #{@filter}
+                halted = (#{chain.config[:terminator]})
+              end
+            RUBY_EVAL
+
+            [@compiled_options[0], filter, @compiled_options[1]].compact.join("\n")
+          else
+            # Compile around filters with conditions into proxy methods
+            # that contain the conditions.
+            #
+            # For `around_save :filter_name, :if => :condition':
+            #
+            # def _conditional_callback_save_17
+            #   if condition
+            #     filter_name do
+            #       yield self
+            #     end
+            #   else
+            #     yield self
+            #   end
+            # end
+            #
+            name = "_conditional_callback_#{@kind}_#{next_id}"
+            txt, line = <<-RUBY_EVAL, __LINE__ + 1
+              def #{name}(halted)
+                #{@compiled_options[0] || "if true"} && !halted
+                  #{@filter} do
+                    yield self
+                  end
+                else
+                  yield self
+                end
+              end
+            RUBY_EVAL
+            @klass.class_eval(txt, __FILE__, line)
+            "#{name}(halted) do"
+          end
         end
-        self
       end
 
-      def find(callback, &block)
-        select { |c| c == callback && (!block_given? || yield(c)) }.first
-      end
+      # This will supply contents for around and after filters, but not
+      # before filters (for the backward pass).
+      def end(key=nil, object=nil)
+        return if key && !object.send("_one_time_conditions_valid_#{@callback_id}?")
 
-      def delete(callback)
-        super(callback.is_a?(Callback) ? callback : find(callback))
+        if @kind == :around || @kind == :after
+          # if condition    # after_save :filter_name, :if => :condition
+          #   filter_name
+          # end
+          if @kind == :after
+            [@compiled_options[0], @filter, @compiled_options[1]].compact.join("\n")
+          else
+            "end"
+          end
+        end
       end
 
       private
-        def self.extract_options(*methods, &block)
-          methods.flatten!
-          options = methods.extract_options!
-          methods << block if block_given?
-          return methods, options
-        end
 
-        def extract_options(*methods, &block)
-          self.class.extract_options(*methods, &block)
+      # Options support the same options as filters themselves (and support
+      # symbols, string, procs, and objects), so compile a conditional
+      # expression based on the options
+      def _compile_options(options)
+        return [] if options[:if].empty? && options[:unless].empty?
+
+        conditions = []
+
+        unless options[:if].empty?
+          conditions << Array.wrap(_compile_filter(options[:if]))
         end
-    end
 
-    class Callback
-      attr_reader :kind, :method, :identifier, :options
+        unless options[:unless].empty?
+          conditions << Array.wrap(_compile_filter(options[:unless])).map {|f| "!#{f}"}
+        end
 
-      def initialize(kind, method, options = {})
-        @kind       = kind
-        @method     = method
-        @identifier = options[:identifier]
-        @options    = options
+        ["if #{conditions.flatten.join(" && ")}", "end"]
       end
 
-      def ==(other)
-        case other
-        when Callback
-          (self.identifier && self.identifier == other.identifier) || self.method == other.method
+      # Filters support:
+      #
+      #   Arrays::  Used in conditions. This is used to specify
+      #             multiple conditions. Used internally to
+      #             merge conditions from skip_* filters
+      #   Symbols:: A method to call
+      #   Strings:: Some content to evaluate
+      #   Procs::   A proc to call with the object
+      #   Objects:: An object with a before_foo method on it to call
+      #
+      # All of these objects are compiled into methods and handled
+      # the same after this point:
+      #
+      #   Arrays::  Merged together into a single filter
+      #   Symbols:: Already methods
+      #   Strings:: class_eval'ed into methods
+      #   Procs::   define_method'ed into methods
+      #   Objects::
+      #     a method is created that calls the before_foo method
+      #     on the object.
+      #
+      def _compile_filter(filter)
+        method_name = "_callback_#{@kind}_#{next_id}"
+        case filter
+        when Array
+          filter.map {|f| _compile_filter(f)}
+        when Symbol
+          filter
+        when String
+          "(#{filter})"
+        when Proc
+          @klass.send(:define_method, method_name, &filter)
+          return method_name if filter.arity <= 0
+
+          method_name << (filter.arity == 1 ? "(self)" : " self, Proc.new ")
         else
-          (self.identifier && self.identifier == other) || self.method == other
+          @klass.send(:define_method, "#{method_name}_object") { filter }
+
+          _normalize_legacy_filter(kind, filter)
+          scopes = Array.wrap(chain.config[:scope])
+          method_to_call = scopes.map{ |s| s.is_a?(Symbol) ? send(s) : s }.join("_")
+
+          @klass.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+            def #{method_name}(&blk)
+              #{method_name}_object.send(:#{method_to_call}, self, &blk)
+            end
+          RUBY_EVAL
+
+          method_name
         end
       end
 
-      def eql?(other)
-        self == other
+      def _normalize_legacy_filter(kind, filter)
+        if !filter.respond_to?(kind) && filter.respond_to?(:filter)
+          filter.metaclass.class_eval(
+            "def #{kind}(context, &block) filter(context, &block) end",
+            __FILE__, __LINE__ - 1)
+        elsif filter.respond_to?(:before) && filter.respond_to?(:after) && kind == :around
+          def filter.around(context)
+            should_continue = before(context)
+            yield if should_continue
+            after(context)
+          end
+        end
       end
+    end
 
-      def dup
-        self.class.new(@kind, @method, @options.dup)
+    # An Array with a compile method
+    class CallbackChain < Array
+      attr_reader :name, :config
+
+      def initialize(name, config)
+        @name = name
+        @config = {
+          :terminator => "false",
+          :rescuable => false,
+          :scope => [ :kind ]
+        }.merge(config)
       end
 
-      def hash
-        if @identifier
-          @identifier.hash
-        else
-          @method.hash
+      def compile(key=nil, object=nil)
+        method = []
+        method << "value = nil"
+        method << "halted = false"
+
+        each do |callback|
+          method << callback.start(key, object)
+        end
+
+        if config[:rescuable]
+          method << "rescued_error = nil"
+          method << "begin"
+        end
+
+        method << "value = yield if block_given? && !halted"
+
+        if config[:rescuable]
+          method << "rescue Exception => e"
+          method << "rescued_error = e"
+          method << "end"
         end
+
+        reverse_each do |callback|
+          method << callback.end(key, object)
+        end
+
+        method << "raise rescued_error if rescued_error" if config[:rescuable]
+        method << "halted ? false : (block_given? ? value : true)"
+        method.compact.join("\n")
       end
 
-      def call(*args, &block)
-        evaluate_method(method, *args, &block) if should_run_callback?(*args)
-      rescue LocalJumpError
-        raise ArgumentError,
-          "Cannot yield from a Proc type filter. The Proc must take two " +
-          "arguments and execute #call on the second argument."
+      def clone(klass)
+        chain = CallbackChain.new(@name, @config.dup)
+        callbacks = map { |c| c.clone(chain, klass) }
+        chain.push(*callbacks)
       end
+    end
 
-      private
-        def evaluate_method(method, *args, &block)
-          case method
-            when Symbol
-              object = args.shift
-              object.send(method, *args, &block)
-            when String
-              eval(method, args.first.instance_eval { binding })
-            when Proc, Method
-              method.call(*args, &block)
-            else
-              if method.respond_to?(kind)
-                method.send(kind, *args, &block)
-              else
-                raise ArgumentError,
-                  "Callbacks must be a symbol denoting the method to call, a string to be evaluated, " +
-                  "a block to be invoked, or an object responding to the callback method."
+    module ClassMethods
+      # Make the run_callbacks :save method. The generated method takes
+      # a block that it'll yield to. It'll call the before and around filters
+      # in order, yield the block, and then run the after filters.
+      #
+      # run_callbacks :save do
+      #   save
+      # end
+      #
+      # The run_callbacks :save method can optionally take a key, which
+      # will be used to compile an optimized callback method for each
+      # key. See #define_callbacks for more information.
+      #
+      def __define_runner(symbol) #:nodoc:
+        body = send("_#{symbol}_callbacks").compile(nil)
+
+        body, line = <<-RUBY_EVAL, __LINE__
+          def _run_#{symbol}_callbacks(key = nil, &blk)
+            if key
+              name = "_run__\#{self.class.name.hash.abs}__#{symbol}__\#{key.hash.abs}__callbacks"
+
+              unless respond_to?(name)
+                self.class.__create_keyed_callback(name, :#{symbol}, self, &blk)
               end
+
+              send(name, &blk)
+            else
+              #{body}
+            end
           end
+          private :_run_#{symbol}_callbacks
+        RUBY_EVAL
+
+        silence_warnings do
+          undef_method "_run_#{symbol}_callbacks" if method_defined?("_run_#{symbol}_callbacks")
+          class_eval body, __FILE__, line
         end
+      end
 
-        def should_run_callback?(*args)
-          [options[:if]].flatten.compact.all? { |a| evaluate_method(a, *args) } &&
-          ![options[:unless]].flatten.compact.any? { |a| evaluate_method(a, *args) }
+      # This is called the first time a callback is called with a particular
+      # key. It creates a new callback method for the key, calculating
+      # which callbacks can be omitted because of per_key conditions.
+      #
+      def __create_keyed_callback(name, kind, object, &blk) #:nodoc:
+        @_keyed_callbacks ||= {}
+        @_keyed_callbacks[name] ||= begin
+          str = send("_#{kind}_callbacks").compile(name, object)
+          class_eval "def #{name}() #{str} end", __FILE__, __LINE__
+          true
         end
-    end
+      end
 
-    def self.included(base)
-      base.extend ClassMethods
-    end
+      # This is used internally to append, prepend and skip callbacks to the
+      # CallbackChain.
+      #
+      def __update_callbacks(name, filters = [], block = nil) #:nodoc:
+        type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
+        options = filters.last.is_a?(Hash) ? filters.pop : {}
+        filters.unshift(block) if block
 
-    module ClassMethods
-      def define_callbacks(*callbacks)
-        callbacks.each do |callback|
-          class_eval <<-"end_eval", __FILE__, __LINE__ + 1
-            def self.#{callback}(*methods, &block)                             # def self.before_save(*methods, &block)
-              callbacks = CallbackChain.build(:#{callback}, *methods, &block)  #   callbacks = CallbackChain.build(:before_save, *methods, &block)
-              @#{callback}_callbacks ||= CallbackChain.new                     #   @before_save_callbacks ||= CallbackChain.new
-              @#{callback}_callbacks.concat callbacks                          #   @before_save_callbacks.concat callbacks
-            end                                                                # end
-                                                                               #
-            def self.#{callback}_callback_chain                                # def self.before_save_callback_chain
-              @#{callback}_callbacks ||= CallbackChain.new                     #   @before_save_callbacks ||= CallbackChain.new
-                                                                               #
-              if superclass.respond_to?(:#{callback}_callback_chain)           #   if superclass.respond_to?(:before_save_callback_chain)
-                CallbackChain.new(                                             #     CallbackChain.new(
-                  superclass.#{callback}_callback_chain +                      #       superclass.before_save_callback_chain +
-                  @#{callback}_callbacks                                       #       @before_save_callbacks
-                )                                                              #     )
-              else                                                             #   else
-                @#{callback}_callbacks                                         #     @before_save_callbacks
-              end                                                              #   end
-            end                                                                # end
-          end_eval
+        chain = send("_#{name}_callbacks")
+        yield chain, type, filters, options if block_given?
+
+        __define_runner(name)
+      end
+
+      # Set callbacks for a previously defined callback.
+      #
+      # Syntax:
+      #   set_callback :save, :before, :before_meth
+      #   set_callback :save, :after,  :after_meth, :if => :condition
+      #   set_callback :save, :around, lambda { |r| stuff; yield; stuff }
+      #
+      # Use skip_callback to skip any defined one.
+      #
+      # When creating or skipping callbacks, you can specify conditions that
+      # are always the same for a given key. For instance, in ActionPack,
+      # we convert :only and :except conditions into per-key conditions.
+      #
+      #   before_filter :authenticate, :except => "index"
+      # becomes
+      #   dispatch_callback :before, :authenticate, :per_key => {:unless => proc {|c| c.action_name == "index"}}
+      #
+      # Per-Key conditions are evaluated only once per use of a given key.
+      # In the case of the above example, you would do:
+      #
+      #   run_callbacks(:dispatch, action_name) { ... dispatch stuff ... }
+      #
+      # In that case, each action_name would get its own compiled callback
+      # method that took into consideration the per_key conditions. This
+      # is a speed improvement for ActionPack.
+      #
+      def set_callback(name, *filters, &block)
+        __update_callbacks(name, filters, block) do |chain, type, filters, options|
+          filters.map! do |filter|
+            chain.delete_if {|c| c.matches?(type, filter) }
+            Callback.new(chain, filter, type, options.dup, self)
+          end
+
+          options[:prepend] ? chain.unshift(*filters) : chain.push(*filters)
         end
       end
-    end
 
-    # Runs all the callbacks defined for the given options.
-    #
-    # If a block is given it will be called after each callback receiving as arguments:
-    #
-    #  * the result from the callback
-    #  * the object which has the callback
-    #
-    # If the result from the block evaluates to +true+, the callback chain is stopped.
-    #
-    # Example:
-    #   class Storage
-    #     include ActiveSupport::Callbacks
-    #
-    #     define_callbacks :before_save, :after_save
-    #   end
-    #
-    #   class ConfigStorage < Storage
-    #     before_save :pass
-    #     before_save :pass
-    #     before_save :stop
-    #     before_save :pass
-    #
-    #     def pass
-    #       puts "pass"
-    #     end
-    #
-    #     def stop
-    #       puts "stop"
-    #       return false
-    #     end
-    #
-    #     def save
-    #       result = run_callbacks(:before_save) { |result, object| result == false }
-    #       puts "- save" if result
-    #     end
-    #   end
-    #
-    #   config = ConfigStorage.new
-    #   config.save
-    #
-    # Output:
-    #   pass
-    #   pass
-    #   stop
-    def run_callbacks(kind, options = {}, &block)
-      self.class.send("#{kind}_callback_chain").run(self, options, &block)
+      # Skip a previously defined callback for a given type.
+      #
+      def skip_callback(name, *filters, &block)
+        __update_callbacks(name, filters, block) do |chain, type, filters, options|
+          chain = send("_#{name}_callbacks=", chain.clone(self))
+
+          filters.each do |filter|
+            filter = chain.find {|c| c.matches?(type, filter) }
+
+            if filter && options.any?
+              filter.recompile!(options, options[:per_key] || {})
+            else
+              chain.delete(filter)
+            end
+          end
+        end
+      end
+
+      # Reset callbacks for a given type.
+      #
+      def reset_callbacks(symbol)
+        send("_#{symbol}_callbacks").clear
+        __define_runner(symbol)
+      end
+
+      # Define callbacks types.
+      #
+      # ==== Example
+      #
+      #   define_callbacks :validate
+      #
+      # ==== Options
+      #
+      # * <tt>:terminator</tt> - Indicates when a before filter is considered
+      # to be halted.
+      #
+      #   define_callbacks :validate, :terminator => "result == false"
+      #
+      # In the example above, if any before validate callbacks returns false,
+      # other callbacks are not executed. Defaults to "false".
+      #
+      # * <tt>:rescuable</tt> - By default, after filters are not executed if
+      # the given block or an before_filter raises an error. Supply :rescuable => true
+      # to change this behavior.
+      #
+      # * <tt>:scope</tt> - Show which methods should be executed when a class
+      # is giben as callback:
+      #
+      #   define_callbacks :filters, :scope => [ :kind ]
+      #
+      # When a class is given:
+      #
+      #   before_filter MyFilter
+      #
+      # It will call the type of the filter in the given class, which in this
+      # case, is "before".
+      #
+      # If, for instance, you supply the given scope:
+      #
+      #   define_callbacks :validate, :scope => [ :kind, :name ]
+      #
+      # It will call "#{kind}_#{name}" in the given class. So "before_validate"
+      # will be called in the class below:
+      #
+      #   before_validate MyValidation
+      #
+      # Defaults to :kind.
+      #
+      def define_callbacks(*symbols)
+        config = symbols.last.is_a?(Hash) ? symbols.pop : {}
+        symbols.each do |symbol|
+          extlib_inheritable_accessor("_#{symbol}_callbacks") do
+            CallbackChain.new(symbol, config)
+          end
+
+          __define_runner(symbol)
+        end
+      end
     end
   end
 end
diff --git a/activesupport/lib/active_support/deprecated_callbacks.rb b/activesupport/lib/active_support/deprecated_callbacks.rb
new file mode 100644
index 0000000000..20fb03cbeb
--- /dev/null
+++ b/activesupport/lib/active_support/deprecated_callbacks.rb
@@ -0,0 +1,283 @@
+require 'active_support/core_ext/array/extract_options'
+
+module ActiveSupport
+  # Callbacks are hooks into the lifecycle of an object that allow you to trigger logic
+  # before or after an alteration of the object state.
+  #
+  # Mixing in this module allows you to define callbacks in your class.
+  #
+  # Example:
+  #   class Storage
+  #     include ActiveSupport::DeprecatedCallbacks
+  #
+  #     define_callbacks :before_save, :after_save
+  #   end
+  #
+  #   class ConfigStorage < Storage
+  #     before_save :saving_message
+  #     def saving_message
+  #       puts "saving..."
+  #     end
+  #
+  #     after_save do |object|
+  #       puts "saved"
+  #     end
+  #
+  #     def save
+  #       run_callbacks(:before_save)
+  #       puts "- save"
+  #       run_callbacks(:after_save)
+  #     end
+  #   end
+  #
+  #   config = ConfigStorage.new
+  #   config.save
+  #
+  # Output:
+  #   saving...
+  #   - save
+  #   saved
+  #
+  # Callbacks from parent classes are inherited.
+  #
+  # Example:
+  #   class Storage
+  #     include ActiveSupport::DeprecatedCallbacks
+  #
+  #     define_callbacks :before_save, :after_save
+  #
+  #     before_save :prepare
+  #     def prepare
+  #       puts "preparing save"
+  #     end
+  #   end
+  #
+  #   class ConfigStorage < Storage
+  #     before_save :saving_message
+  #     def saving_message
+  #       puts "saving..."
+  #     end
+  #
+  #     after_save do |object|
+  #       puts "saved"
+  #     end
+  #
+  #     def save
+  #       run_callbacks(:before_save)
+  #       puts "- save"
+  #       run_callbacks(:after_save)
+  #     end
+  #   end
+  #
+  #   config = ConfigStorage.new
+  #   config.save
+  #
+  # Output:
+  #   preparing save
+  #   saving...
+  #   - save
+  #   saved
+  module DeprecatedCallbacks
+    class CallbackChain < Array
+      def self.build(kind, *methods, &block)
+        methods, options = extract_options(*methods, &block)
+        methods.map! { |method| Callback.new(kind, method, options) }
+        new(methods)
+      end
+
+      def run(object, options = {}, &terminator)
+        enumerator = options[:enumerator] || :each
+
+        unless block_given?
+          send(enumerator) { |callback| callback.call(object) }
+        else
+          send(enumerator) do |callback|
+            result = callback.call(object)
+            break result if terminator.call(result, object)
+          end
+        end
+      end
+
+      # TODO: Decompose into more Array like behavior
+      def replace_or_append!(chain)
+        if index = index(chain)
+          self[index] = chain
+        else
+          self << chain
+        end
+        self
+      end
+
+      def find(callback, &block)
+        select { |c| c == callback && (!block_given? || yield(c)) }.first
+      end
+
+      def delete(callback)
+        super(callback.is_a?(Callback) ? callback : find(callback))
+      end
+
+      private
+        def self.extract_options(*methods, &block)
+          methods.flatten!
+          options = methods.extract_options!
+          methods << block if block_given?
+          return methods, options
+        end
+
+        def extract_options(*methods, &block)
+          self.class.extract_options(*methods, &block)
+        end
+    end
+
+    class Callback
+      attr_reader :kind, :method, :identifier, :options
+
+      def initialize(kind, method, options = {})
+        @kind       = kind
+        @method     = method
+        @identifier = options[:identifier]
+        @options    = options
+      end
+
+      def ==(other)
+        case other
+        when Callback
+          (self.identifier && self.identifier == other.identifier) || self.method == other.method
+        else
+          (self.identifier && self.identifier == other) || self.method == other
+        end
+      end
+
+      def eql?(other)
+        self == other
+      end
+
+      def dup
+        self.class.new(@kind, @method, @options.dup)
+      end
+
+      def hash
+        if @identifier
+          @identifier.hash
+        else
+          @method.hash
+        end
+      end
+
+      def call(*args, &block)
+        evaluate_method(method, *args, &block) if should_run_callback?(*args)
+      rescue LocalJumpError
+        raise ArgumentError,
+          "Cannot yield from a Proc type filter. The Proc must take two " +
+          "arguments and execute #call on the second argument."
+      end
+
+      private
+        def evaluate_method(method, *args, &block)
+          case method
+            when Symbol
+              object = args.shift
+              object.send(method, *args, &block)
+            when String
+              eval(method, args.first.instance_eval { binding })
+            when Proc, Method
+              method.call(*args, &block)
+            else
+              if method.respond_to?(kind)
+                method.send(kind, *args, &block)
+              else
+                raise ArgumentError,
+                  "Callbacks must be a symbol denoting the method to call, a string to be evaluated, " +
+                  "a block to be invoked, or an object responding to the callback method."
+              end
+          end
+        end
+
+        def should_run_callback?(*args)
+          [options[:if]].flatten.compact.all? { |a| evaluate_method(a, *args) } &&
+          ![options[:unless]].flatten.compact.any? { |a| evaluate_method(a, *args) }
+        end
+    end
+
+    def self.included(base)
+      base.extend ClassMethods
+    end
+
+    module ClassMethods
+      def define_callbacks(*callbacks)
+        ActiveSupport::Deprecation.warn('ActiveSupport::DeprecatedCallbacks has been deprecated in favor of ActiveSupport::Callbacks', caller)
+
+        callbacks.each do |callback|
+          class_eval <<-"end_eval", __FILE__, __LINE__ + 1
+            def self.#{callback}(*methods, &block)                             # def self.before_save(*methods, &block)
+              callbacks = CallbackChain.build(:#{callback}, *methods, &block)  #   callbacks = CallbackChain.build(:before_save, *methods, &block)
+              @#{callback}_callbacks ||= CallbackChain.new                     #   @before_save_callbacks ||= CallbackChain.new
+              @#{callback}_callbacks.concat callbacks                          #   @before_save_callbacks.concat callbacks
+            end                                                                # end
+                                                                               #
+            def self.#{callback}_callback_chain                                # def self.before_save_callback_chain
+              @#{callback}_callbacks ||= CallbackChain.new                     #   @before_save_callbacks ||= CallbackChain.new
+                                                                               #
+              if superclass.respond_to?(:#{callback}_callback_chain)           #   if superclass.respond_to?(:before_save_callback_chain)
+                CallbackChain.new(                                             #     CallbackChain.new(
+                  superclass.#{callback}_callback_chain +                      #       superclass.before_save_callback_chain +
+                  @#{callback}_callbacks                                       #       @before_save_callbacks
+                )                                                              #     )
+              else                                                             #   else
+                @#{callback}_callbacks                                         #     @before_save_callbacks
+              end                                                              #   end
+            end                                                                # end
+          end_eval
+        end
+      end
+    end
+
+    # Runs all the callbacks defined for the given options.
+    #
+    # If a block is given it will be called after each callback receiving as arguments:
+    #
+    #  * the result from the callback
+    #  * the object which has the callback
+    #
+    # If the result from the block evaluates to +true+, the callback chain is stopped.
+    #
+    # Example:
+    #   class Storage
+    #     include ActiveSupport::DeprecatedCallbacks
+    #
+    #     define_callbacks :before_save, :after_save
+    #   end
+    #
+    #   class ConfigStorage < Storage
+    #     before_save :pass
+    #     before_save :pass
+    #     before_save :stop
+    #     before_save :pass
+    #
+    #     def pass
+    #       puts "pass"
+    #     end
+    #
+    #     def stop
+    #       puts "stop"
+    #       return false
+    #     end
+    #
+    #     def save
+    #       result = run_callbacks(:before_save) { |result, object| result == false }
+    #       puts "- save" if result
+    #     end
+    #   end
+    #
+    #   config = ConfigStorage.new
+    #   config.save
+    #
+    # Output:
+    #   pass
+    #   pass
+    #   stop
+    def run_callbacks(kind, options = {}, &block)
+      self.class.send("#{kind}_callback_chain").run(self, options, &block)
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/deprecation/behaviors.rb b/activesupport/lib/active_support/deprecation/behaviors.rb
index c531a1aa58..0c065fb103 100644
--- a/activesupport/lib/active_support/deprecation/behaviors.rb
+++ b/activesupport/lib/active_support/deprecation/behaviors.rb
@@ -23,7 +23,7 @@ module ActiveSupport
          $stderr.puts callstack.join("\n  ") if debug
        },
       'development' => Proc.new { |message, callstack|
-         logger = defined?(Rails) ? Rails.logger : Logger.new($stderr)
+         logger = (Rails.logger if defined?(Rails)) || Logger.new($stderr)
          logger.warn message
          logger.debug callstack.join("\n  ") if debug
        }
diff --git a/activesupport/lib/active_support/memoizable.rb b/activesupport/lib/active_support/memoizable.rb
index b197fbc9bf..f810f53029 100644
--- a/activesupport/lib/active_support/memoizable.rb
+++ b/activesupport/lib/active_support/memoizable.rb
@@ -2,19 +2,6 @@ require 'active_support/core_ext/object/metaclass'
 require 'active_support/core_ext/module/aliasing'
 
 module ActiveSupport
-  module SafelyMemoizable
-    def safely_memoize(*symbols)
-      symbols.each do |symbol|
-        class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          def #{symbol}(*args)
-            memoized = @_memoized_#{symbol} || ::ActiveSupport::ConcurrentHash.new
-            memoized[args] ||= memoized_#{symbol}(*args)
-          end
-        RUBY
-      end
-    end
-  end
-  
   module Memoizable
     def self.memoized_ivar_for(symbol)
       "@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index fcdc09ff08..282346b1a6 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -29,7 +29,7 @@ module ActiveSupport
       raise InvalidSignature if signed_message.blank?
 
       data, digest = signed_message.split("--")
-      if secure_compare(digest, generate_digest(data))
+      if data.present? && digest.present? && secure_compare(digest, generate_digest(data))
         Marshal.load(ActiveSupport::Base64.decode64(data))
       else
         raise InvalidSignature
diff --git a/activesupport/lib/active_support/new_callbacks.rb b/activesupport/lib/active_support/new_callbacks.rb
deleted file mode 100644
index 2f0853d84a..0000000000
--- a/activesupport/lib/active_support/new_callbacks.rb
+++ /dev/null
@@ -1,563 +0,0 @@
-require 'active_support/core_ext/array/wrap'
-require 'active_support/core_ext/class/inheritable_attributes'
-require 'active_support/core_ext/kernel/reporting'
-
-module ActiveSupport
-  # Callbacks are hooks into the lifecycle of an object that allow you to trigger logic
-  # before or after an alteration of the object state.
-  #
-  # Mixing in this module allows you to define callbacks in your class.
-  #
-  # Example:
-  #   class Storage
-  #     include ActiveSupport::Callbacks
-  #
-  #     define_callbacks :save
-  #   end
-  #
-  #   class ConfigStorage < Storage
-  #     set_callback :save, :before, :saving_message
-  #     def saving_message
-  #       puts "saving..."
-  #     end
-  #
-  #     set_callback :save, :after do |object|
-  #       puts "saved"
-  #     end
-  #
-  #     def save
-  #       _run_set_callback :save,s do
-  #         puts "- save"
-  #       end
-  #     end
-  #   end
-  #
-  #   config = ConfigStorage.new
-  #   config.save
-  #
-  # Output:
-  #   saving...
-  #   - save
-  #   saved
-  #
-  # Callbacks from parent classes are inherited.
-  #
-  # Example:
-  #   class Storage
-  #     include ActiveSupport::Callbacks
-  #
-  #     define_callbacks :save
-  #
-  #     set_callback :save, :before, :prepare
-  #     def prepare
-  #       puts "preparing save"
-  #     end
-  #   end
-  #
-  #   class ConfigStorage < Storage
-  #     set_callback :save, :before, :saving_message
-  #     def saving_message
-  #       puts "saving..."
-  #     end
-  #
-  #     set_callback :save, :after do |object|
-  #       puts "saved"
-  #     end
-  #
-  #     def save
-  #       _run_set_callback :save,s do
-  #         puts "- save"
-  #       end
-  #     end
-  #   end
-  #
-  #   config = ConfigStorage.new
-  #   config.save
-  #
-  # Output:
-  #   preparing save
-  #   saving...
-  #   - save
-  #   saved
-  #
-  module NewCallbacks
-    def self.included(klass)
-      klass.extend ClassMethods
-    end
-
-    def run_callbacks(kind, options = {}, &blk)
-      send("_run_#{kind}_callbacks", &blk)
-    end
-
-    class Callback
-      @@_callback_sequence = 0
-
-      attr_accessor :chain, :filter, :kind, :options, :per_key, :klass
-
-      def initialize(chain, filter, kind, options, klass)
-        @chain, @kind, @klass = chain, kind, klass
-        normalize_options!(options)
-
-        @per_key              = options.delete(:per_key)
-        @raw_filter, @options = filter, options
-        @filter               = _compile_filter(filter)
-        @compiled_options     = _compile_options(options)
-        @callback_id          = next_id
-
-        _compile_per_key_options
-      end
-
-      def clone(chain, klass)
-        obj                  = super()
-        obj.chain            = chain
-        obj.klass            = klass
-        obj.per_key          = @per_key.dup
-        obj.options          = @options.dup
-        obj.per_key[:if]     = @per_key[:if].dup
-        obj.per_key[:unless] = @per_key[:unless].dup
-        obj.options[:if]     = @options[:if].dup
-        obj.options[:unless] = @options[:unless].dup
-        obj
-      end
-
-      def normalize_options!(options)
-        options[:if] = Array.wrap(options[:if])
-        options[:unless] = Array.wrap(options[:unless])
-
-        options[:per_key] ||= {}
-        options[:per_key][:if] = Array.wrap(options[:per_key][:if])
-        options[:per_key][:unless] = Array.wrap(options[:per_key][:unless])
-      end
-
-      def name
-        chain.name
-      end
-
-      def next_id
-        @@_callback_sequence += 1
-      end
-
-      def matches?(_kind, _filter)
-        @kind == _kind && @filter == _filter
-      end
-
-      def _update_filter(filter_options, new_options)
-        filter_options[:if].push(new_options[:unless]) if new_options.key?(:unless)
-        filter_options[:unless].push(new_options[:if]) if new_options.key?(:if)
-      end
-
-      def recompile!(_options, _per_key)
-        _update_filter(self.options, _options)
-        _update_filter(self.per_key, _per_key)
-
-        @callback_id      = next_id
-        @filter           = _compile_filter(@raw_filter)
-        @compiled_options = _compile_options(@options)
-                            _compile_per_key_options
-      end
-
-      def _compile_per_key_options
-        key_options  = _compile_options(@per_key)
-
-        @klass.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
-          def _one_time_conditions_valid_#{@callback_id}?
-            true #{key_options[0]}
-          end
-        RUBY_EVAL
-      end
-      
-      # This will supply contents for before and around filters, and no
-      # contents for after filters (for the forward pass).
-      def start(key=nil, object=nil)
-        return if key && !object.send("_one_time_conditions_valid_#{@callback_id}?")
-
-        # options[0] is the compiled form of supplied conditions
-        # options[1] is the "end" for the conditional
-        #
-        if @kind == :before || @kind == :around
-          if @kind == :before
-            # if condition    # before_save :filter_name, :if => :condition
-            #   filter_name
-            # end
-            filter = <<-RUBY_EVAL
-              unless halted
-                result = #{@filter}
-                halted = (#{chain.config[:terminator]})
-              end
-            RUBY_EVAL
-
-            [@compiled_options[0], filter, @compiled_options[1]].compact.join("\n")
-          else
-            # Compile around filters with conditions into proxy methods
-            # that contain the conditions.
-            #
-            # For `around_save :filter_name, :if => :condition':
-            #
-            # def _conditional_callback_save_17
-            #   if condition
-            #     filter_name do
-            #       yield self
-            #     end
-            #   else
-            #     yield self
-            #   end
-            # end
-            #
-            name = "_conditional_callback_#{@kind}_#{next_id}"
-            txt, line = <<-RUBY_EVAL, __LINE__ + 1
-              def #{name}(halted)
-                #{@compiled_options[0] || "if true"} && !halted
-                  #{@filter} do
-                    yield self
-                  end
-                else
-                  yield self
-                end
-              end
-            RUBY_EVAL
-            @klass.class_eval(txt, __FILE__, line)
-            "#{name}(halted) do"
-          end
-        end
-      end
-      
-      # This will supply contents for around and after filters, but not
-      # before filters (for the backward pass).
-      def end(key=nil, object=nil)
-        return if key && !object.send("_one_time_conditions_valid_#{@callback_id}?")
-
-        if @kind == :around || @kind == :after
-          # if condition    # after_save :filter_name, :if => :condition
-          #   filter_name
-          # end
-          if @kind == :after
-            [@compiled_options[0], @filter, @compiled_options[1]].compact.join("\n")
-          else
-            "end"
-          end
-        end
-      end
-
-      private
-
-      # Options support the same options as filters themselves (and support
-      # symbols, string, procs, and objects), so compile a conditional
-      # expression based on the options
-      def _compile_options(options)
-        return [] if options[:if].empty? && options[:unless].empty?
-
-        conditions = []
-
-        unless options[:if].empty?
-          conditions << Array.wrap(_compile_filter(options[:if]))
-        end
-
-        unless options[:unless].empty?
-          conditions << Array.wrap(_compile_filter(options[:unless])).map {|f| "!#{f}"}
-        end
-
-        ["if #{conditions.flatten.join(" && ")}", "end"]
-      end
-
-      # Filters support:
-      #
-      #   Arrays::  Used in conditions. This is used to specify
-      #             multiple conditions. Used internally to
-      #             merge conditions from skip_* filters
-      #   Symbols:: A method to call
-      #   Strings:: Some content to evaluate
-      #   Procs::   A proc to call with the object
-      #   Objects:: An object with a before_foo method on it to call
-      #
-      # All of these objects are compiled into methods and handled
-      # the same after this point:
-      #
-      #   Arrays::  Merged together into a single filter
-      #   Symbols:: Already methods
-      #   Strings:: class_eval'ed into methods
-      #   Procs::   define_method'ed into methods
-      #   Objects:: 
-      #     a method is created that calls the before_foo method
-      #     on the object.
-      #
-      def _compile_filter(filter)
-        method_name = "_callback_#{@kind}_#{next_id}"
-        case filter
-        when Array
-          filter.map {|f| _compile_filter(f)}
-        when Symbol
-          filter
-        when String
-          "(#{filter})"
-        when Proc
-          @klass.send(:define_method, method_name, &filter)
-          return method_name if filter.arity <= 0
-
-          method_name << (filter.arity == 1 ? "(self)" : " self, Proc.new ")
-        else
-          @klass.send(:define_method, "#{method_name}_object") { filter }
-
-          _normalize_legacy_filter(kind, filter)
-          scopes = Array.wrap(chain.config[:scope])
-          method_to_call = scopes.map{ |s| s.is_a?(Symbol) ? send(s) : s }.join("_")
-
-          @klass.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
-            def #{method_name}(&blk)
-              #{method_name}_object.send(:#{method_to_call}, self, &blk)
-            end
-          RUBY_EVAL
-
-          method_name
-        end
-      end
-
-      def _normalize_legacy_filter(kind, filter)
-        if !filter.respond_to?(kind) && filter.respond_to?(:filter)
-          filter.metaclass.class_eval(
-            "def #{kind}(context, &block) filter(context, &block) end",
-            __FILE__, __LINE__ - 1)
-        elsif filter.respond_to?(:before) && filter.respond_to?(:after) && kind == :around
-          def filter.around(context)
-            should_continue = before(context)
-            yield if should_continue
-            after(context)
-          end
-        end
-      end
-    end
-
-    # An Array with a compile method
-    class CallbackChain < Array
-      attr_reader :name, :config
-
-      def initialize(name, config)
-        @name = name
-        @config = {
-          :terminator => "false",
-          :rescuable => false,
-          :scope => [ :kind ]
-        }.merge(config)
-      end
-
-      def compile(key=nil, object=nil)
-        method = []
-        method << "value = nil"
-        method << "halted = false"
-
-        each do |callback|
-          method << callback.start(key, object)
-        end
-
-        if config[:rescuable]
-          method << "rescued_error = nil"
-          method << "begin"
-        end
-
-        method << "value = yield if block_given? && !halted"
-
-        if config[:rescuable]
-          method << "rescue Exception => e"
-          method << "rescued_error = e"
-          method << "end"
-        end
-
-        reverse_each do |callback|
-          method << callback.end(key, object)
-        end
-
-        method << "raise rescued_error if rescued_error" if config[:rescuable]
-        method << "halted ? false : (block_given? ? value : true)"
-        method.compact.join("\n")
-      end
-
-      def clone(klass)
-        chain = CallbackChain.new(@name, @config.dup)
-        callbacks = map { |c| c.clone(chain, klass) }
-        chain.push(*callbacks)
-      end
-    end
-
-    module ClassMethods
-      # Make the _run_set_callback :save method. The generated method takes
-      # a block that it'll yield to. It'll call the before and around filters
-      # in order, yield the block, and then run the after filters.
-      # 
-      # _run_set_callback :save do
-      #   save
-      # end
-      #
-      # The _run_set_callback :save method can optionally take a key, which
-      # will be used to compile an optimized callback method for each
-      # key. See #define_callbacks for more information.
-      #
-      def __define_runner(symbol) #:nodoc:
-        body = send("_#{symbol}_callbacks").compile(nil)
-
-        body, line = <<-RUBY_EVAL, __LINE__
-          def _run_#{symbol}_callbacks(key = nil, &blk)
-            if key
-              name = "_run__\#{self.class.name.hash.abs}__#{symbol}__\#{key.hash.abs}__callbacks"
-
-              unless respond_to?(name)
-                self.class.__create_keyed_callback(name, :#{symbol}, self, &blk)
-              end
-
-              send(name, &blk)
-            else
-              #{body}
-            end
-          end
-        RUBY_EVAL
-
-        silence_warnings do
-          undef_method "_run_#{symbol}_callbacks" if method_defined?("_run_#{symbol}_callbacks")
-          class_eval body, __FILE__, line
-        end
-      end
-      
-      # This is called the first time a callback is called with a particular
-      # key. It creates a new callback method for the key, calculating
-      # which callbacks can be omitted because of per_key conditions.
-      #
-      def __create_keyed_callback(name, kind, object, &blk) #:nodoc:
-        @_keyed_callbacks ||= {}
-        @_keyed_callbacks[name] ||= begin
-          str = send("_#{kind}_callbacks").compile(name, object)
-          class_eval "def #{name}() #{str} end", __FILE__, __LINE__
-          true
-        end
-      end
-
-      # This is used internally to append, prepend and skip callbacks to the
-      # CallbackChain.
-      #
-      def __update_callbacks(name, filters = [], block = nil) #:nodoc:
-        type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
-        options = filters.last.is_a?(Hash) ? filters.pop : {}
-        filters.unshift(block) if block
-
-        chain = send("_#{name}_callbacks")
-        yield chain, type, filters, options if block_given?
-
-        __define_runner(name)
-      end
-
-      # Set callbacks for a previously defined callback.
-      #
-      # Syntax:
-      #   set_callback :save, :before, :before_meth
-      #   set_callback :save, :after,  :after_meth, :if => :condition
-      #   set_callback :save, :around, lambda { |r| stuff; yield; stuff }
-      #
-      # It also updates the _run_<name>_callbacks method, which is the public
-      # API to run the callbacks. Use skip_callback to skip any defined one.
-      #
-      # When creating or skipping callbacks, you can specify conditions that
-      # are always the same for a given key. For instance, in ActionPack,
-      # we convert :only and :except conditions into per-key conditions.
-      #
-      #   before_filter :authenticate, :except => "index"
-      # becomes
-      #   dispatch_callback :before, :authenticate, :per_key => {:unless => proc {|c| c.action_name == "index"}}
-      #
-      # Per-Key conditions are evaluated only once per use of a given key.
-      # In the case of the above example, you would do:
-      #
-      #   _run_dispatch_callbacks(action_name) { ... dispatch stuff ... }
-      #
-      # In that case, each action_name would get its own compiled callback
-      # method that took into consideration the per_key conditions. This
-      # is a speed improvement for ActionPack.
-      #
-      def set_callback(name, *filters, &block)
-        __update_callbacks(name, filters, block) do |chain, type, filters, options|
-          filters.map! do |filter|
-            chain.delete_if {|c| c.matches?(type, filter) }
-            Callback.new(chain, filter, type, options.dup, self)
-          end
-
-          options[:prepend] ? chain.unshift(*filters) : chain.push(*filters)
-        end
-      end
-
-      # Skip a previously defined callback for a given type.
-      #
-      def skip_callback(name, *filters, &block)
-        __update_callbacks(name, filters, block) do |chain, type, filters, options|
-          chain = send("_#{name}_callbacks=", chain.clone(self))
-
-          filters.each do |filter|
-            filter = chain.find {|c| c.matches?(type, filter) }
-
-            if filter && options.any?
-              filter.recompile!(options, options[:per_key] || {})
-            else
-              chain.delete(filter)
-            end
-          end
-        end
-      end
-
-      # Reset callbacks for a given type.
-      #
-      def reset_callbacks(symbol)
-        send("_#{symbol}_callbacks").clear
-        __define_runner(symbol)
-      end
-
-      # Define callbacks types.
-      #
-      # ==== Example
-      #
-      #   define_callbacks :validate
-      #
-      # ==== Options
-      #
-      # * <tt>:terminator</tt> - Indicates when a before filter is considered
-      # to be halted.
-      #
-      #   define_callbacks :validate, :terminator => "result == false"
-      #
-      # In the example above, if any before validate callbacks returns false,
-      # other callbacks are not executed. Defaults to "false".
-      #
-      # * <tt>:rescuable</tt> - By default, after filters are not executed if
-      # the given block or an before_filter raises an error. Supply :rescuable => true
-      # to change this behavior.
-      #
-      # * <tt>:scope</tt> - Show which methods should be executed when a class
-      # is giben as callback:
-      #
-      #   define_callbacks :filters, :scope => [ :kind ]
-      #
-      # When a class is given:
-      #
-      #   before_filter MyFilter
-      #
-      # It will call the type of the filter in the given class, which in this
-      # case, is "before".
-      #
-      # If, for instance, you supply the given scope:
-      #
-      #   define_callbacks :validate, :scope => [ :kind, :name ]
-      #
-      # It will call "#{kind}_#{name}" in the given class. So "before_validate"
-      # will be called in the class below:
-      #
-      #   before_validate MyValidation
-      #
-      # Defaults to :kind.
-      #
-      def define_callbacks(*symbols)
-        config = symbols.last.is_a?(Hash) ? symbols.pop : {}
-        symbols.each do |symbol|
-          extlib_inheritable_accessor("_#{symbol}_callbacks") do
-            CallbackChain.new(symbol, config)
-          end
-
-          __define_runner(symbol)
-        end
-      end
-    end
-  end
-end
diff --git a/activesupport/lib/active_support/testing/isolation.rb b/activesupport/lib/active_support/testing/isolation.rb
index cdd6d5f49b..bec303f6ab 100644
--- a/activesupport/lib/active_support/testing/isolation.rb
+++ b/activesupport/lib/active_support/testing/isolation.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/load_error'
+
 module ActiveSupport
   module Testing
     class ProxyTestResult
@@ -107,4 +109,4 @@ if ENV['ISOLATION_TEST']
       super && test.method_name == ENV['ISOLATION_TEST']
     end
   end
-end
\ No newline at end of file
+end
diff --git a/activesupport/lib/active_support/testing/setup_and_teardown.rb b/activesupport/lib/active_support/testing/setup_and_teardown.rb
index b59ac79e7b..b738ef334c 100644
--- a/activesupport/lib/active_support/testing/setup_and_teardown.rb
+++ b/activesupport/lib/active_support/testing/setup_and_teardown.rb
@@ -1,12 +1,12 @@
-require 'active_support/callbacks'
-
 module ActiveSupport
   module Testing
     module SetupAndTeardown
       def self.included(base)
         base.class_eval do
+          extend ClassMethods
+
           include ActiveSupport::Callbacks
-          define_callbacks :setup, :teardown
+          define_callbacks :test
 
           if defined?(MiniTest::Assertions) && TestCase < MiniTest::Assertions
             include ForMiniTest
@@ -16,25 +16,38 @@ module ActiveSupport
         end
       end
 
+      module ClassMethods
+        def setup(*args, &block)
+          set_callback(:test, :before, *args, &block)
+        end
+
+        def teardown(*args, &block)
+          set_callback(:test, :after, *args, &block)
+        end
+
+        def wrap(*args, &block)
+          set_callback(:test, :around, *args, &block)
+        end
+      end
+
       module ForMiniTest
         def run(runner)
           result = '.'
           begin
-            run_callbacks :setup
-            result = super
+            run_callbacks :test do
+              begin
+                result = super
+              rescue Exception => e
+                result = runner.puke(self.class, self.name, e)
+              end
+            end
           rescue Exception => e
             result = runner.puke(self.class, self.name, e)
-          ensure
-            begin
-              run_callbacks :teardown, :enumerator => :reverse_each
-            rescue Exception => e
-              result = runner.puke(self.class, self.name, e)
-            end
           end
           result
         end
       end
-      
+
       module ForClassicTestUnit
         # For compatibility with Ruby < 1.8.6
         PASSTHROUGH_EXCEPTIONS = Test::Unit::TestCase::PASSTHROUGH_EXCEPTIONS rescue [NoMemoryError, SignalException, Interrupt, SystemExit]
@@ -57,27 +70,27 @@ module ActiveSupport
           @_result = result
           begin
             begin
-              run_callbacks :setup
-              setup
-              __send__(@method_name)
-              mocha_verify(assertion_counter) if using_mocha
-            rescue Mocha::ExpectationError => e
-              add_failure(e.message, e.backtrace)
+              run_callbacks :test do
+                begin
+                  setup
+                  __send__(@method_name)
+                  mocha_verify(assertion_counter) if using_mocha
+                rescue Mocha::ExpectationError => e
+                  add_failure(e.message, e.backtrace)
+                rescue Test::Unit::AssertionFailedError => e
+                  add_failure(e.message, e.backtrace)
+                rescue Exception => e
+                  raise if PASSTHROUGH_EXCEPTIONS.include?(e.class)
+                  add_error(e)
+                ensure
+                  teardown
+                end
+              end
             rescue Test::Unit::AssertionFailedError => e
               add_failure(e.message, e.backtrace)
             rescue Exception => e
               raise if PASSTHROUGH_EXCEPTIONS.include?(e.class)
               add_error(e)
-            ensure
-              begin
-                teardown
-                run_callbacks :teardown, :enumerator => :reverse_each
-              rescue Test::Unit::AssertionFailedError => e
-                add_failure(e.message, e.backtrace)
-              rescue Exception => e
-                raise if PASSTHROUGH_EXCEPTIONS.include?(e.class)
-                add_error(e)
-              end
             end
           ensure
             mocha_teardown if using_mocha
diff --git a/activesupport/test/caching_test.rb b/activesupport/test/caching_test.rb
index 7667f11343..892aa97ad7 100644
--- a/activesupport/test/caching_test.rb
+++ b/activesupport/test/caching_test.rb
@@ -342,3 +342,22 @@ uses_memcached 'memcached backed store' do
     include CacheStoreBehavior
   end
 end
+
+class CacheStoreLoggerTest < ActiveSupport::TestCase
+  def setup
+    @cache = ActiveSupport::Cache.lookup_store(:memory_store)
+
+    @buffer = StringIO.new
+    @cache.logger = Logger.new(@buffer)
+  end
+
+  def test_logging
+    @cache.fetch('foo') { 'bar' }
+    assert @buffer.string.present?
+  end
+
+  def test_mute_logging
+    @cache.mute { @cache.fetch('foo') { 'bar' } }
+    assert @buffer.string.blank?
+  end
+end
diff --git a/activesupport/test/new_callback_inheritance_test.rb b/activesupport/test/callback_inheritance_test.rb
index fe316ae3da..18721eab19 100644
--- a/activesupport/test/new_callback_inheritance_test.rb
+++ b/activesupport/test/callback_inheritance_test.rb
@@ -3,35 +3,35 @@ $:.unshift "#{File.dirname(__FILE__)}/../lib"
 require 'active_support'
 
 class GrandParent
-  include ActiveSupport::NewCallbacks
-  
+  include ActiveSupport::Callbacks
+
   attr_reader :log, :action_name
   def initialize(action_name)
     @action_name, @log = action_name, []
   end
-  
+
   define_callbacks :dispatch
   set_callback :dispatch, :before, :before1, :before2, :per_key => {:if => proc {|c| c.action_name == "index" || c.action_name == "update" }}
-  set_callback :dispatch, :after, :after1, :after2, :per_key => {:if => proc {|c| c.action_name == "update" || c.action_name == "delete" }}  
-  
+  set_callback :dispatch, :after, :after1, :after2, :per_key => {:if => proc {|c| c.action_name == "update" || c.action_name == "delete" }}
+
   def before1
     @log << "before1"
   end
-  
+
   def before2
     @log << "before2"
   end
-  
-  def after1 
+
+  def after1
     @log << "after1"
   end
-  
+
   def after2
     @log << "after2"
   end
-  
+
   def dispatch
-    _run_dispatch_callbacks(action_name) do
+    run_callbacks(:dispatch, action_name) do
       @log << action_name
     end
     self
@@ -45,11 +45,11 @@ end
 
 class Child < GrandParent
   skip_callback :dispatch, :before, :before2, :per_key => {:unless => proc {|c| c.action_name == "update" }}, :if => :state_open?
-  
+
   def state_open?
     @state == :open
   end
-  
+
   def initialize(action_name, state)
     super(action_name)
     @state = state
@@ -64,15 +64,15 @@ class BasicCallbacksTest < Test::Unit::TestCase
     @delete   = GrandParent.new("delete").dispatch
     @unknown  = GrandParent.new("unknown").dispatch
   end
-  
+
   def test_basic_per_key1
     assert_equal %w(before1 before2 index), @index.log
   end
-  
+
   def test_basic_per_key2
     assert_equal %w(before1 before2 update after2 after1), @update.log
   end
-  
+
   def test_basic_per_key3
     assert_equal %w(delete after2 after1), @delete.log
   end
@@ -85,15 +85,15 @@ class InheritedCallbacksTest < Test::Unit::TestCase
     @delete   = Parent.new("delete").dispatch
     @unknown  = Parent.new("unknown").dispatch
   end
-  
+
   def test_inherited_excluded
     assert_equal %w(before1 index), @index.log
   end
-  
+
   def test_inherited_not_excluded
     assert_equal %w(before1 before2 update after1), @update.log
   end
-  
+
   def test_partially_excluded
     assert_equal %w(delete after2 after1), @delete.log
   end
@@ -104,11 +104,11 @@ class InheritedCallbacksTest2 < Test::Unit::TestCase
     @update1 = Child.new("update", :open).dispatch
     @update2 = Child.new("update", :closed).dispatch
   end
-  
+
   def test_crazy_mix_on
     assert_equal %w(before1 update after2 after1), @update1.log
   end
-  
+
   def test_crazy_mix_off
     assert_equal %w(before1 before2 update after2 after1), @update2.log
   end
diff --git a/activesupport/test/callbacks_test.rb b/activesupport/test/callbacks_test.rb
index 2f747e2238..df98644436 100644
--- a/activesupport/test/callbacks_test.rb
+++ b/activesupport/test/callbacks_test.rb
@@ -1,188 +1,528 @@
-require 'abstract_unit'
+# require 'abstract_unit'
+require 'test/unit'
+$:.unshift "#{File.dirname(__FILE__)}/../lib"
+require 'active_support'
 
-class Record
-  include ActiveSupport::Callbacks
+module CallbacksTest
+  class Record
+    include ActiveSupport::Callbacks
 
-  define_callbacks :before_save, :after_save
+    define_callbacks :save
 
-  class << self
-    def callback_symbol(callback_method)
-      method_name = "#{callback_method}_method"
-      define_method(method_name) do
-        history << [callback_method, :symbol]
+    def self.before_save(*filters, &blk)
+      set_callback(:save, :before, *filters, &blk)
+    end
+
+    def self.after_save(*filters, &blk)
+      set_callback(:save, :after, *filters, &blk)
+    end
+
+    class << self
+      def callback_symbol(callback_method)
+        method_name = :"#{callback_method}_method"
+        define_method(method_name) do
+          history << [callback_method, :symbol]
+        end
+        method_name
+      end
+
+      def callback_string(callback_method)
+        "history << [#{callback_method.to_sym.inspect}, :string]"
+      end
+
+      def callback_proc(callback_method)
+        Proc.new { |model| model.history << [callback_method, :proc] }
+      end
+
+      def callback_object(callback_method)
+        klass = Class.new
+        klass.send(:define_method, callback_method) do |model|
+          model.history << [:"#{callback_method}_save", :object]
+        end
+        klass.new
       end
-      method_name
     end
 
-    def callback_string(callback_method)
-      "history << [#{callback_method.to_sym.inspect}, :string]"
+    def history
+      @history ||= []
+    end
+  end
+
+  class Person < Record
+    [:before_save, :after_save].each do |callback_method|
+      callback_method_sym = callback_method.to_sym
+      send(callback_method, callback_symbol(callback_method_sym))
+      send(callback_method, callback_string(callback_method_sym))
+      send(callback_method, callback_proc(callback_method_sym))
+      send(callback_method, callback_object(callback_method_sym.to_s.gsub(/_save/, '')))
+      send(callback_method) { |model| model.history << [callback_method_sym, :block] }
     end
 
-    def callback_proc(callback_method)
-      Proc.new { |model| model.history << [callback_method, :proc] }
+    def save
+      run_callbacks :save
     end
+  end
+
+  class PersonSkipper < Person
+    skip_callback :save, :before, :before_save_method, :if => :yes
+    skip_callback :save, :after, :before_save_method, :unless => :yes
+    skip_callback :save, :after, :before_save_method, :if => :no
+    skip_callback :save, :before, :before_save_method, :unless => :no
+    def yes; true; end
+    def no; false; end
+  end
+
+  class ParentController
+    include ActiveSupport::Callbacks
+
+    define_callbacks :dispatch
+
+    set_callback :dispatch, :before, :log, :per_key => {:unless => proc {|c| c.action_name == :index || c.action_name == :show }}
+    set_callback :dispatch, :after, :log2
 
-    def callback_object(callback_method)
-      klass = Class.new
-      klass.send(:define_method, callback_method) do |model|
-        model.history << [callback_method, :object]
+    attr_reader :action_name, :logger
+    def initialize(action_name)
+      @action_name, @logger = action_name, []
+    end
+
+    def log
+      @logger << action_name
+    end
+
+    def log2
+      @logger << action_name
+    end
+
+    def dispatch
+      run_callbacks :dispatch, action_name do
+        @logger << "Done"
       end
-      klass.new
+      self
     end
   end
 
-  def history
-    @history ||= []
+  class Child < ParentController
+    skip_callback :dispatch, :before, :log, :per_key => {:if => proc {|c| c.action_name == :update} }
+    skip_callback :dispatch, :after, :log2
   end
-end
 
-class Person < Record
-  [:before_save, :after_save].each do |callback_method|
-    callback_method_sym = callback_method.to_sym
-    send(callback_method, callback_symbol(callback_method_sym))
-    send(callback_method, callback_string(callback_method_sym))
-    send(callback_method, callback_proc(callback_method_sym))
-    send(callback_method, callback_object(callback_method_sym))
-    send(callback_method) { |model| model.history << [callback_method_sym, :block] }
+  class OneTimeCompile < Record
+    @@starts_true, @@starts_false = true, false
+
+    def initialize
+      super
+    end
+
+    before_save Proc.new {|r| r.history << [:before_save, :starts_true, :if] }, :per_key => {:if => :starts_true}
+    before_save Proc.new {|r| r.history << [:before_save, :starts_false, :if] }, :per_key => {:if => :starts_false}
+    before_save Proc.new {|r| r.history << [:before_save, :starts_true, :unless] }, :per_key => {:unless => :starts_true}
+    before_save Proc.new {|r| r.history << [:before_save, :starts_false, :unless] }, :per_key => {:unless => :starts_false}
+
+    def starts_true
+      if @@starts_true
+        @@starts_true = false
+        return true
+      end
+      @@starts_true
+    end
+
+    def starts_false
+      unless @@starts_false
+        @@starts_false = true
+        return false
+      end
+      @@starts_false
+    end
+
+    def save
+      run_callbacks :save, :action
+    end
   end
 
-  def save
-    run_callbacks(:before_save)
-    run_callbacks(:after_save)
+  class OneTimeCompileTest < Test::Unit::TestCase
+    def test_optimized_first_compile
+      around = OneTimeCompile.new
+      around.save
+      assert_equal [
+        [:before_save, :starts_true, :if],
+        [:before_save, :starts_true, :unless]
+      ], around.history
+    end
   end
-end
 
-class ConditionalPerson < Record
-  # proc
-  before_save Proc.new { |r| r.history << [:before_save, :proc] }, :if => Proc.new { |r| true }
-  before_save Proc.new { |r| r.history << "b00m" }, :if => Proc.new { |r| false }
-  before_save Proc.new { |r| r.history << [:before_save, :proc] }, :unless => Proc.new { |r| false }
-  before_save Proc.new { |r| r.history << "b00m" }, :unless => Proc.new { |r| true }
-  # symbol
-  before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :if => :yes
-  before_save Proc.new { |r| r.history << "b00m" }, :if => :no
-  before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :unless => :no
-  before_save Proc.new { |r| r.history << "b00m" }, :unless => :yes
-  # string
-  before_save Proc.new { |r| r.history << [:before_save, :string] }, :if => 'yes'
-  before_save Proc.new { |r| r.history << "b00m" }, :if => 'no'
-  before_save Proc.new { |r| r.history << [:before_save, :string] }, :unless => 'no'
-  before_save Proc.new { |r| r.history << "b00m" }, :unless => 'yes'
-  # Array with conditions
-  before_save Proc.new { |r| r.history << [:before_save, :symbol_array] }, :if => [:yes, :other_yes]
-  before_save Proc.new { |r| r.history << "b00m" }, :if => [:yes, :no]
-  before_save Proc.new { |r| r.history << [:before_save, :symbol_array] }, :unless => [:no, :other_no]
-  before_save Proc.new { |r| r.history << "b00m" }, :unless => [:yes, :no]
-  # Combined if and unless
-  before_save Proc.new { |r| r.history << [:before_save, :combined_symbol] }, :if => :yes, :unless => :no
-  before_save Proc.new { |r| r.history << "b00m" }, :if => :yes, :unless => :yes
-  # Array with different types of conditions
-  before_save Proc.new { |r| r.history << [:before_save, :symbol_proc_string_array] }, :if => [:yes, Proc.new { |r| true }, 'yes']
-  before_save Proc.new { |r| r.history << "b00m" }, :if => [:yes, Proc.new { |r| true }, 'no']
-  # Array with different types of conditions comibned if and unless
-  before_save Proc.new { |r| r.history << [:before_save, :combined_symbol_proc_string_array] },
-              :if => [:yes, Proc.new { |r| true }, 'yes'], :unless => [:no, 'no']
-  before_save Proc.new { |r| r.history << "b00m" }, :if => [:yes, Proc.new { |r| true }, 'no'], :unless => [:no, 'no']
-
-  def yes; true; end
-  def other_yes; true; end
-  def no; false; end
-  def other_no; false; end
-
-  def save
-    run_callbacks(:before_save)
-    run_callbacks(:after_save)
+  class ConditionalPerson < Record
+    # proc
+    before_save Proc.new { |r| r.history << [:before_save, :proc] }, :if => Proc.new { |r| true }
+    before_save Proc.new { |r| r.history << "b00m" }, :if => Proc.new { |r| false }
+    before_save Proc.new { |r| r.history << [:before_save, :proc] }, :unless => Proc.new { |r| false }
+    before_save Proc.new { |r| r.history << "b00m" }, :unless => Proc.new { |r| true }
+    # symbol
+    before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :if => :yes
+    before_save Proc.new { |r| r.history << "b00m" }, :if => :no
+    before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :unless => :no
+    before_save Proc.new { |r| r.history << "b00m" }, :unless => :yes
+    # string
+    before_save Proc.new { |r| r.history << [:before_save, :string] }, :if => 'yes'
+    before_save Proc.new { |r| r.history << "b00m" }, :if => 'no'
+    before_save Proc.new { |r| r.history << [:before_save, :string] }, :unless => 'no'
+    before_save Proc.new { |r| r.history << "b00m" }, :unless => 'yes'
+    # Combined if and unless
+    before_save Proc.new { |r| r.history << [:before_save, :combined_symbol] }, :if => :yes, :unless => :no
+    before_save Proc.new { |r| r.history << "b00m" }, :if => :yes, :unless => :yes
+
+    def yes; true; end
+    def other_yes; true; end
+    def no; false; end
+    def other_no; false; end
+
+    def save
+      run_callbacks :save
+    end
   end
-end
 
-class CallbacksTest < Test::Unit::TestCase
-  def test_save_person
-    person = Person.new
-    assert_equal [], person.history
-    person.save
-    assert_equal [
-      [:before_save, :symbol],
-      [:before_save, :string],
-      [:before_save, :proc],
-      [:before_save, :object],
-      [:before_save, :block],
-      [:after_save, :symbol],
-      [:after_save, :string],
-      [:after_save, :proc],
-      [:after_save, :object],
-      [:after_save, :block]
-    ], person.history
+  class CleanPerson < ConditionalPerson
+    reset_callbacks :save
   end
-end
 
-class ConditionalCallbackTest < Test::Unit::TestCase
-  def test_save_conditional_person
-    person = ConditionalPerson.new
-    person.save
-    assert_equal [
-      [:before_save, :proc],
-      [:before_save, :proc],
-      [:before_save, :symbol],
-      [:before_save, :symbol],
-      [:before_save, :string],
-      [:before_save, :string],
-      [:before_save, :symbol_array],
-      [:before_save, :symbol_array],
-      [:before_save, :combined_symbol],
-      [:before_save, :symbol_proc_string_array],
-      [:before_save, :combined_symbol_proc_string_array]
-    ], person.history
+  class MySuper
+    include ActiveSupport::Callbacks
+    define_callbacks :save
   end
-end
 
-class CallbackTest < Test::Unit::TestCase
-  include ActiveSupport::Callbacks
+  class AroundPerson < MySuper
+    attr_reader :history
+
+    set_callback :save, :before, :nope,           :if =>     :no
+    set_callback :save, :before, :nope,           :unless => :yes
+    set_callback :save, :after,  :tweedle
+    set_callback :save, :before, "tweedle_dee"
+    set_callback :save, :before, proc {|m| m.history << "yup" }
+    set_callback :save, :before, :nope,           :if =>     proc { false }
+    set_callback :save, :before, :nope,           :unless => proc { true }
+    set_callback :save, :before, :yup,            :if =>     proc { true }
+    set_callback :save, :before, :yup,            :unless => proc { false }
+    set_callback :save, :around, :tweedle_dum
+    set_callback :save, :around, :w0tyes,         :if =>     :yes
+    set_callback :save, :around, :w0tno,          :if =>     :no
+    set_callback :save, :around, :tweedle_deedle
+
+    def no; false; end
+    def yes; true; end
+
+    def nope
+      @history << "boom"
+    end
+
+    def yup
+      @history << "yup"
+    end
+
+    def w0tyes
+      @history << "w0tyes before"
+      yield
+      @history << "w0tyes after"
+    end
+
+    def w0tno
+      @history << "boom"
+      yield
+    end
+
+    def tweedle_dee
+      @history << "tweedle dee"
+    end
+
+    def tweedle_dum
+      @history << "tweedle dum pre"
+      yield
+      @history << "tweedle dum post"
+    end
+
+    def tweedle
+      @history << "tweedle"
+    end
+
+    def tweedle_deedle
+      @history << "tweedle deedle pre"
+      yield
+      @history << "tweedle deedle post"
+    end
+
+    def initialize
+      @history = []
+    end
 
-  def test_eql
-    callback = Callback.new(:before, :save, :identifier => :lifesaver)
-    assert callback.eql?(Callback.new(:before, :save, :identifier => :lifesaver))
-    assert callback.eql?(Callback.new(:before, :save))
-    assert callback.eql?(:lifesaver)
-    assert callback.eql?(:save)
-    assert !callback.eql?(Callback.new(:before, :destroy))
-    assert !callback.eql?(:destroy)
+    def save
+      run_callbacks :save do
+        @history << "running"
+      end
+    end
   end
 
-  def test_dup
-    a = Callback.new(:before, :save)
-    assert_equal({}, a.options)
-    b = a.dup
-    b.options[:unless] = :pigs_fly
-    assert_equal({:unless => :pigs_fly}, b.options)
-    assert_equal({}, a.options)
+  class HyphenatedCallbacks
+    include ActiveSupport::Callbacks
+    define_callbacks :save
+    attr_reader :stuff
+
+    set_callback :save, :before, :omg, :per_key => {:if => :yes}
+
+    def yes() true end
+
+    def omg
+      @stuff = "OMG"
+    end
+
+    def save
+      run_callbacks :save, "hyphen-ated" do
+        @stuff
+      end
+    end
+  end
+
+  class AroundCallbacksTest < Test::Unit::TestCase
+    def test_save_around
+      around = AroundPerson.new
+      around.save
+      assert_equal [
+        "tweedle dee",
+        "yup", "yup",
+        "tweedle dum pre",
+        "w0tyes before",
+        "tweedle deedle pre",
+        "running",
+        "tweedle deedle post",
+        "w0tyes after",
+        "tweedle dum post",
+        "tweedle"
+      ], around.history
+    end
+  end
+
+  class SkipCallbacksTest < Test::Unit::TestCase
+    def test_skip_person
+      person = PersonSkipper.new
+      assert_equal [], person.history
+      person.save
+      assert_equal [
+        [:before_save, :string],
+        [:before_save, :proc],
+        [:before_save, :object],
+        [:before_save, :block],
+        [:after_save, :block],
+        [:after_save, :object],
+        [:after_save, :proc],
+        [:after_save, :string],
+        [:after_save, :symbol]
+      ], person.history
+    end
+  end
+
+  class CallbacksTest < Test::Unit::TestCase
+    def test_save_person
+      person = Person.new
+      assert_equal [], person.history
+      person.save
+      assert_equal [
+        [:before_save, :symbol],
+        [:before_save, :string],
+        [:before_save, :proc],
+        [:before_save, :object],
+        [:before_save, :block],
+        [:after_save, :block],
+        [:after_save, :object],
+        [:after_save, :proc],
+        [:after_save, :string],
+        [:after_save, :symbol]
+      ], person.history
+    end
+  end
+
+  class ConditionalCallbackTest < Test::Unit::TestCase
+    def test_save_conditional_person
+      person = ConditionalPerson.new
+      person.save
+      assert_equal [
+        [:before_save, :proc],
+        [:before_save, :proc],
+        [:before_save, :symbol],
+        [:before_save, :symbol],
+        [:before_save, :string],
+        [:before_save, :string],
+        [:before_save, :combined_symbol],
+      ], person.history
+    end
+  end
+
+  class ResetCallbackTest < Test::Unit::TestCase
+    def test_save_conditional_person
+      person = CleanPerson.new
+      person.save
+      assert_equal [], person.history
+    end
+  end
+
+  class CallbackTerminator
+    include ActiveSupport::Callbacks
+
+    define_callbacks :save, :terminator => "result == :halt"
+
+    set_callback :save, :before, :first
+    set_callback :save, :before, :second
+    set_callback :save, :around, :around_it
+    set_callback :save, :before, :third
+    set_callback :save, :after, :first
+    set_callback :save, :around, :around_it
+    set_callback :save, :after, :second
+    set_callback :save, :around, :around_it
+    set_callback :save, :after, :third
+
+
+    attr_reader :history, :saved
+    def initialize
+      @history = []
+    end
+
+    def around_it
+      @history << "around1"
+      yield
+      @history << "around2"
+    end
+
+    def first
+      @history << "first"
+    end
+
+    def second
+      @history << "second"
+      :halt
+    end
+
+    def third
+      @history << "third"
+    end
+
+    def save
+      run_callbacks :save do
+        @saved = true
+      end
+    end
+  end
+
+  class CallbackObject
+    def before(caller)
+      caller.record << "before"
+    end
+
+    def before_save(caller)
+      caller.record << "before save"
+    end
+
+    def around(caller)
+      caller.record << "around before"
+      yield
+      caller.record << "around after"
+    end
+  end
+
+  class UsingObjectBefore
+    include ActiveSupport::Callbacks
+
+    define_callbacks :save
+    set_callback :save, :before, CallbackObject.new
+
+    attr_accessor :record
+    def initialize
+      @record = []
+    end
+
+    def save
+      run_callbacks :save do
+        @record << "yielded"
+      end
+    end
   end
-end
 
-class CallbackChainTest < Test::Unit::TestCase
-  include ActiveSupport::Callbacks
+  class UsingObjectAround
+    include ActiveSupport::Callbacks
 
-  def setup
-    @chain = CallbackChain.build(:make, :bacon, :lettuce, :tomato)
+    define_callbacks :save
+    set_callback :save, :around, CallbackObject.new
+
+    attr_accessor :record
+    def initialize
+      @record = []
+    end
+
+    def save
+      run_callbacks :save do
+        @record << "yielded"
+      end
+    end
   end
 
-  def test_build
-    assert_equal 3, @chain.size
-    assert_equal [:bacon, :lettuce, :tomato], @chain.map(&:method)
+  class CustomScopeObject
+    include ActiveSupport::Callbacks
+
+    define_callbacks :save, :scope => [:kind, :name]
+    set_callback :save, :before, CallbackObject.new
+
+    attr_accessor :record
+    def initialize
+      @record = []
+    end
+
+    def save
+      run_callbacks :save do
+        @record << "yielded"
+        "CallbackResult"
+      end
+    end
   end
 
-  def test_find
-    assert_equal :bacon, @chain.find(:bacon).method
+  class UsingObjectTest < Test::Unit::TestCase
+    def test_before_object
+      u = UsingObjectBefore.new
+      u.save
+      assert_equal ["before", "yielded"], u.record
+    end
+
+    def test_around_object
+      u = UsingObjectAround.new
+      u.save
+      assert_equal ["around before", "yielded", "around after"], u.record
+    end
+
+    def test_customized_object
+      u = CustomScopeObject.new
+      u.save
+      assert_equal ["before save", "yielded"], u.record
+    end
+
+    def test_block_result_is_returned
+      u = CustomScopeObject.new
+      assert_equal "CallbackResult", u.save
+    end
   end
 
-  def test_replace_or_append
-    assert_equal [:bacon, :lettuce, :tomato], (@chain.replace_or_append!(Callback.new(:make, :bacon))).map(&:method)
-    assert_equal [:bacon, :lettuce, :tomato, :turkey], (@chain.replace_or_append!(Callback.new(:make, :turkey))).map(&:method)
-    assert_equal [:bacon, :lettuce, :tomato, :turkey, :mayo], (@chain.replace_or_append!(Callback.new(:make, :mayo))).map(&:method)
+  class CallbackTerminatorTest < Test::Unit::TestCase
+    def test_termination
+      terminator = CallbackTerminator.new
+      terminator.save
+      assert_equal ["first", "second", "third", "second", "first"], terminator.history
+    end
+
+    def test_block_never_called_if_terminated
+      obj = CallbackTerminator.new
+      obj.save
+      assert !obj.saved
+    end
   end
 
-  def test_delete
-    assert_equal [:bacon, :lettuce, :tomato], @chain.map(&:method)
-    @chain.delete(:bacon)
-    assert_equal [:lettuce, :tomato], @chain.map(&:method)
+  class HyphenatedKeyTest < Test::Unit::TestCase
+    def test_save
+      obj = HyphenatedCallbacks.new
+      obj.save
+      assert_equal obj.stuff, "OMG"
+    end
   end
 end
diff --git a/activesupport/test/message_verifier_test.rb b/activesupport/test/message_verifier_test.rb
index e6370bc3db..ef300e4e26 100644
--- a/activesupport/test/message_verifier_test.rb
+++ b/activesupport/test/message_verifier_test.rb
@@ -27,6 +27,7 @@ class MessageVerifierTest < Test::Unit::TestCase
     data, hash = @verifier.generate(@data).split("--")
     assert_not_verified("#{data.reverse}--#{hash}")
     assert_not_verified("#{data}--#{hash.reverse}")
+    assert_not_verified("purejunk")
   end
 
   def assert_not_verified(message)
diff --git a/activesupport/test/new_callbacks_test.rb b/activesupport/test/new_callbacks_test.rb
deleted file mode 100644
index 04db376fc6..0000000000
--- a/activesupport/test/new_callbacks_test.rb
+++ /dev/null
@@ -1,528 +0,0 @@
-# require 'abstract_unit'
-require 'test/unit'
-$:.unshift "#{File.dirname(__FILE__)}/../lib"
-require 'active_support'
-
-module NewCallbacksTest
-  class Record
-    include ActiveSupport::NewCallbacks
-
-    define_callbacks :save
-  
-    def self.before_save(*filters, &blk)
-      set_callback(:save, :before, *filters, &blk)
-    end
-  
-    def self.after_save(*filters, &blk)
-      set_callback(:save, :after, *filters, &blk)
-    end
-
-    class << self
-      def callback_symbol(callback_method)
-        method_name = :"#{callback_method}_method"
-        define_method(method_name) do
-          history << [callback_method, :symbol]
-        end
-        method_name
-      end
-
-      def callback_string(callback_method)
-        "history << [#{callback_method.to_sym.inspect}, :string]"
-      end
-
-      def callback_proc(callback_method)
-        Proc.new { |model| model.history << [callback_method, :proc] }
-      end
-
-      def callback_object(callback_method)
-        klass = Class.new
-        klass.send(:define_method, callback_method) do |model|
-          model.history << [:"#{callback_method}_save", :object]
-        end
-        klass.new
-      end
-    end
-
-    def history
-      @history ||= []
-    end
-  end
-
-  class Person < Record
-    [:before_save, :after_save].each do |callback_method|
-      callback_method_sym = callback_method.to_sym
-      send(callback_method, callback_symbol(callback_method_sym))
-      send(callback_method, callback_string(callback_method_sym))
-      send(callback_method, callback_proc(callback_method_sym))
-      send(callback_method, callback_object(callback_method_sym.to_s.gsub(/_save/, '')))
-      send(callback_method) { |model| model.history << [callback_method_sym, :block] }
-    end
-
-    def save
-      _run_save_callbacks {}
-    end
-  end
-
-  class PersonSkipper < Person
-    skip_callback :save, :before, :before_save_method, :if => :yes
-    skip_callback :save, :after, :before_save_method, :unless => :yes
-    skip_callback :save, :after, :before_save_method, :if => :no
-    skip_callback :save, :before, :before_save_method, :unless => :no
-    def yes; true; end
-    def no; false; end
-  end
-
-  class ParentController
-    include ActiveSupport::NewCallbacks
-
-    define_callbacks :dispatch
-    
-    set_callback :dispatch, :before, :log, :per_key => {:unless => proc {|c| c.action_name == :index || c.action_name == :show }}
-    set_callback :dispatch, :after, :log2
-  
-    attr_reader :action_name, :logger
-    def initialize(action_name)
-      @action_name, @logger = action_name, []
-    end
-  
-    def log
-      @logger << action_name
-    end
-  
-    def log2
-      @logger << action_name
-    end
-  
-    def dispatch
-      _run_dispatch_callbacks(action_name) {
-        @logger << "Done"
-      }
-      self
-    end
-  end
-
-  class Child < ParentController
-    skip_callback :dispatch, :before, :log, :per_key => {:if => proc {|c| c.action_name == :update} }
-    skip_callback :dispatch, :after, :log2
-  end
-
-  class OneTimeCompile < Record
-    @@starts_true, @@starts_false = true, false
-  
-    def initialize
-      super
-    end
-  
-    before_save Proc.new {|r| r.history << [:before_save, :starts_true, :if] }, :per_key => {:if => :starts_true}
-    before_save Proc.new {|r| r.history << [:before_save, :starts_false, :if] }, :per_key => {:if => :starts_false}
-    before_save Proc.new {|r| r.history << [:before_save, :starts_true, :unless] }, :per_key => {:unless => :starts_true}
-    before_save Proc.new {|r| r.history << [:before_save, :starts_false, :unless] }, :per_key => {:unless => :starts_false}
-  
-    def starts_true
-      if @@starts_true
-        @@starts_true = false
-        return true
-      end
-      @@starts_true
-    end
-  
-    def starts_false
-      unless @@starts_false
-        @@starts_false = true
-        return false
-      end
-      @@starts_false
-    end
-  
-    def save
-      _run_save_callbacks(:action) {}
-    end
-  end
-
-  class OneTimeCompileTest < Test::Unit::TestCase
-    def test_optimized_first_compile
-      around = OneTimeCompile.new
-      around.save
-      assert_equal [
-        [:before_save, :starts_true, :if],
-        [:before_save, :starts_true, :unless]
-      ], around.history
-    end
-  end
-
-  class ConditionalPerson < Record
-    # proc
-    before_save Proc.new { |r| r.history << [:before_save, :proc] }, :if => Proc.new { |r| true }
-    before_save Proc.new { |r| r.history << "b00m" }, :if => Proc.new { |r| false }
-    before_save Proc.new { |r| r.history << [:before_save, :proc] }, :unless => Proc.new { |r| false }
-    before_save Proc.new { |r| r.history << "b00m" }, :unless => Proc.new { |r| true }
-    # symbol
-    before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :if => :yes
-    before_save Proc.new { |r| r.history << "b00m" }, :if => :no
-    before_save Proc.new { |r| r.history << [:before_save, :symbol] }, :unless => :no
-    before_save Proc.new { |r| r.history << "b00m" }, :unless => :yes
-    # string
-    before_save Proc.new { |r| r.history << [:before_save, :string] }, :if => 'yes'
-    before_save Proc.new { |r| r.history << "b00m" }, :if => 'no'
-    before_save Proc.new { |r| r.history << [:before_save, :string] }, :unless => 'no'
-    before_save Proc.new { |r| r.history << "b00m" }, :unless => 'yes'
-    # Combined if and unless
-    before_save Proc.new { |r| r.history << [:before_save, :combined_symbol] }, :if => :yes, :unless => :no
-    before_save Proc.new { |r| r.history << "b00m" }, :if => :yes, :unless => :yes
-
-    def yes; true; end
-    def other_yes; true; end
-    def no; false; end
-    def other_no; false; end
-
-    def save
-      _run_save_callbacks {}
-    end
-  end
-
-  class CleanPerson < ConditionalPerson
-    reset_callbacks :save
-  end
-
-  class MySuper
-    include ActiveSupport::NewCallbacks
-    define_callbacks :save
-  end
-
-  class AroundPerson < MySuper
-    attr_reader :history
-  
-    set_callback :save, :before, :nope,           :if =>     :no
-    set_callback :save, :before, :nope,           :unless => :yes
-    set_callback :save, :after,  :tweedle
-    set_callback :save, :before, "tweedle_dee"
-    set_callback :save, :before, proc {|m| m.history << "yup" }
-    set_callback :save, :before, :nope,           :if =>     proc { false }
-    set_callback :save, :before, :nope,           :unless => proc { true }
-    set_callback :save, :before, :yup,            :if =>     proc { true }
-    set_callback :save, :before, :yup,            :unless => proc { false }
-    set_callback :save, :around, :tweedle_dum
-    set_callback :save, :around, :w0tyes,         :if =>     :yes
-    set_callback :save, :around, :w0tno,          :if =>     :no
-    set_callback :save, :around, :tweedle_deedle
-  
-    def no; false; end
-    def yes; true; end
-  
-    def nope
-      @history << "boom"
-    end
-  
-    def yup
-      @history << "yup"
-    end
-  
-    def w0tyes
-      @history << "w0tyes before"
-      yield
-      @history << "w0tyes after"
-    end
-  
-    def w0tno
-      @history << "boom"
-      yield
-    end
-  
-    def tweedle_dee
-      @history << "tweedle dee"
-    end
-  
-    def tweedle_dum
-      @history << "tweedle dum pre"
-      yield
-      @history << "tweedle dum post"
-    end
-  
-    def tweedle
-      @history << "tweedle"
-    end
-  
-    def tweedle_deedle
-      @history << "tweedle deedle pre"
-      yield
-      @history << "tweedle deedle post"
-    end
-  
-    def initialize
-      @history = []
-    end
-  
-    def save
-      _run_save_callbacks do
-        @history << "running"
-      end
-    end
-  end
-
-  class HyphenatedCallbacks
-    include ActiveSupport::NewCallbacks
-    define_callbacks :save
-    attr_reader :stuff
-    
-    set_callback :save, :before, :omg, :per_key => {:if => :yes}
-    
-    def yes() true end
-      
-    def omg
-      @stuff = "OMG"
-    end
-    
-    def save
-      _run_save_callbacks("hyphen-ated") do
-        @stuff
-      end
-    end
-  end
-
-  class AroundCallbacksTest < Test::Unit::TestCase
-    def test_save_around
-      around = AroundPerson.new
-      around.save
-      assert_equal [
-        "tweedle dee",
-        "yup", "yup",
-        "tweedle dum pre",
-        "w0tyes before",
-        "tweedle deedle pre",
-        "running",
-        "tweedle deedle post",
-        "w0tyes after",
-        "tweedle dum post",
-        "tweedle"
-      ], around.history
-    end
-  end
-
-  class SkipCallbacksTest < Test::Unit::TestCase
-    def test_skip_person
-      person = PersonSkipper.new
-      assert_equal [], person.history
-      person.save
-      assert_equal [
-        [:before_save, :string],
-        [:before_save, :proc],
-        [:before_save, :object],
-        [:before_save, :block],
-        [:after_save, :block],
-        [:after_save, :object],
-        [:after_save, :proc],
-        [:after_save, :string],
-        [:after_save, :symbol]
-      ], person.history
-    end
-  end
-
-  class CallbacksTest < Test::Unit::TestCase
-    def test_save_person
-      person = Person.new
-      assert_equal [], person.history
-      person.save
-      assert_equal [
-        [:before_save, :symbol],
-        [:before_save, :string],
-        [:before_save, :proc],
-        [:before_save, :object],
-        [:before_save, :block],
-        [:after_save, :block],
-        [:after_save, :object],
-        [:after_save, :proc],
-        [:after_save, :string],
-        [:after_save, :symbol]
-      ], person.history
-    end
-  end
-
-  class ConditionalCallbackTest < Test::Unit::TestCase
-    def test_save_conditional_person
-      person = ConditionalPerson.new
-      person.save
-      assert_equal [
-        [:before_save, :proc],
-        [:before_save, :proc],
-        [:before_save, :symbol],
-        [:before_save, :symbol],
-        [:before_save, :string],
-        [:before_save, :string],
-        [:before_save, :combined_symbol],
-      ], person.history
-    end
-  end
-
-  class ResetCallbackTest < Test::Unit::TestCase
-    def test_save_conditional_person
-      person = CleanPerson.new
-      person.save
-      assert_equal [], person.history
-    end
-  end
-
-  class CallbackTerminator
-    include ActiveSupport::NewCallbacks
-  
-    define_callbacks :save, :terminator => "result == :halt"
-  
-    set_callback :save, :before, :first
-    set_callback :save, :before, :second
-    set_callback :save, :around, :around_it  
-    set_callback :save, :before, :third
-    set_callback :save, :after, :first
-    set_callback :save, :around, :around_it
-    set_callback :save, :after, :second
-    set_callback :save, :around, :around_it
-    set_callback :save, :after, :third
-
-  
-    attr_reader :history, :saved
-    def initialize
-      @history = []
-    end
-  
-    def around_it
-      @history << "around1"
-      yield
-      @history << "around2"
-    end
-  
-    def first
-      @history << "first"
-    end
-  
-    def second
-      @history << "second"
-      :halt
-    end
-  
-    def third
-      @history << "third"
-    end
-  
-    def save
-      _run_save_callbacks do
-        @saved = true
-      end
-    end
-  end
-
-  class CallbackObject
-    def before(caller)
-      caller.record << "before"
-    end
-
-    def before_save(caller)
-      caller.record << "before save"
-    end
-
-    def around(caller)
-      caller.record << "around before"
-      yield
-      caller.record << "around after"
-    end
-  end
-
-  class UsingObjectBefore
-    include ActiveSupport::NewCallbacks
-
-    define_callbacks :save
-    set_callback :save, :before, CallbackObject.new
-
-    attr_accessor :record
-    def initialize
-      @record = []
-    end
-
-    def save
-      _run_save_callbacks do
-        @record << "yielded"
-      end
-    end 
-  end
-
-  class UsingObjectAround
-    include ActiveSupport::NewCallbacks
-    
-    define_callbacks :save
-    set_callback :save, :around, CallbackObject.new
-    
-    attr_accessor :record
-    def initialize
-      @record = []
-    end
-    
-    def save
-      _run_save_callbacks do
-        @record << "yielded"
-      end
-    end 
-  end
-
-  class CustomScopeObject
-    include ActiveSupport::NewCallbacks
-
-    define_callbacks :save, :scope => [:kind, :name]
-    set_callback :save, :before, CallbackObject.new
-
-    attr_accessor :record
-    def initialize
-      @record = []
-    end
-
-    def save
-      _run_save_callbacks do
-        @record << "yielded"
-        "CallbackResult"
-      end
-    end 
-  end
-
-  class UsingObjectTest < Test::Unit::TestCase
-    def test_before_object
-      u = UsingObjectBefore.new
-      u.save
-      assert_equal ["before", "yielded"], u.record
-    end
-
-    def test_around_object
-      u = UsingObjectAround.new
-      u.save
-      assert_equal ["around before", "yielded", "around after"], u.record
-    end
-
-    def test_customized_object
-      u = CustomScopeObject.new
-      u.save
-      assert_equal ["before save", "yielded"], u.record
-    end
-
-    def test_block_result_is_returned
-      u = CustomScopeObject.new
-      assert_equal "CallbackResult", u.save
-    end
-  end
-
-  class CallbackTerminatorTest < Test::Unit::TestCase
-    def test_termination
-      terminator = CallbackTerminator.new
-      terminator.save
-      assert_equal ["first", "second", "third", "second", "first"], terminator.history
-    end
-    
-    def test_block_never_called_if_terminated
-      obj = CallbackTerminator.new
-      obj.save
-      assert !obj.saved
-    end
-  end
-  
-  class HyphenatedKeyTest < Test::Unit::TestCase
-    def test_save
-      obj = HyphenatedCallbacks.new
-      obj.save
-      assert_equal obj.stuff, "OMG"
-    end
-  end
-end
diff --git a/activesupport/test/test_test.rb b/activesupport/test/test_test.rb
index 40d3d612e7..7a45dab60b 100644
--- a/activesupport/test/test_test.rb
+++ b/activesupport/test/test_test.rb
@@ -4,7 +4,7 @@ require 'active_support/core_ext/kernel/reporting'
 class AssertDifferenceTest < ActiveSupport::TestCase
   def setup
     @object = Class.new do
-      attr_accessor :num 
+      attr_accessor :num
       def increment
         self.num += 1
       end
@@ -12,7 +12,7 @@ class AssertDifferenceTest < ActiveSupport::TestCase
       def decrement
         self.num -= 1
       end
-    end.new    
+    end.new
     @object.num = 0
   end
 
@@ -95,55 +95,3 @@ end
 
 class AlsoDoingNothingTest < ActiveSupport::TestCase
 end
-
-# Setup and teardown callbacks.
-class SetupAndTeardownTest < ActiveSupport::TestCase
-  setup :reset_callback_record, :foo
-  teardown :foo, :sentinel, :foo
-
-  def test_inherited_setup_callbacks
-    assert_equal [:reset_callback_record, :foo], self.class.setup_callback_chain.map(&:method)
-    assert_equal [:foo], @called_back
-    assert_equal [:foo, :sentinel, :foo], self.class.teardown_callback_chain.map(&:method)
-  end
-
-  def setup
-  end
-
-  def teardown
-  end
-
-  protected
-    def reset_callback_record
-      @called_back = []
-    end
-
-    def foo
-      @called_back << :foo
-    end
-
-    def sentinel
-      assert_equal [:foo, :foo], @called_back
-    end
-end
-
-
-class SubclassSetupAndTeardownTest < SetupAndTeardownTest
-  setup :bar
-  teardown :bar
-
-  def test_inherited_setup_callbacks
-    assert_equal [:reset_callback_record, :foo, :bar], self.class.setup_callback_chain.map(&:method)
-    assert_equal [:foo, :bar], @called_back
-    assert_equal [:foo, :sentinel, :foo, :bar], self.class.teardown_callback_chain.map(&:method)
-  end
-
-  protected
-    def bar
-      @called_back << :bar
-    end
-
-    def sentinel
-      assert_equal [:foo, :bar, :bar, :foo], @called_back
-    end
-end
diff --git a/ci/geminstaller.yml b/ci/geminstaller.yml
index 8dde704e79..70729ea34a 100644
--- a/ci/geminstaller.yml
+++ b/ci/geminstaller.yml
@@ -1,5 +1,7 @@
 ---
 gems:
+- name: erubis
+  version: >= 2.6.5
 - name: geminstaller
   version: >= 0.4.3
 - name: fcgi
diff --git a/railties/Rakefile b/railties/Rakefile
index e36930af4f..23f9603b65 100644
--- a/railties/Rakefile
+++ b/railties/Rakefile
@@ -80,7 +80,8 @@ end
 # Run application generator -------------------------------------------------------------
 
 task :create_rails do
-  require File.join(File.dirname(__FILE__), 'lib', 'generators')
+  $LOAD_PATH.unshift "#{File.dirname(__FILE__)}/lib"
+  require 'rails/generators'
   require 'rails/generators/rails/app/app_generator'
   Rails::Generators::AppGenerator.start [ File.basename(PKG_DESTINATION), "--quiet" ],
                                         :destination_root => File.expand_path(File.dirname(PKG_DESTINATION))
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index 6139e20e95..d54120f850 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -1,29 +1,487 @@
 module Rails
   class Application
+    extend Initializable
 
-    def self.config
-      @config ||= Configuration.new
+    class << self
+      def config
+        @config ||= Configuration.new
+      end
+
+      # TODO: change the plugin loader to use config
+      alias configuration config
+
+      def config=(config)
+        @config = config
+      end
+
+      def plugin_loader
+        @plugin_loader ||= config.plugin_loader.new(self)
+      end
+
+      def routes
+        ActionController::Routing::Routes
+      end
+
+      def middleware
+        config.middleware
+      end
+
+      def call(env)
+        @app ||= middleware.build(routes)
+        @app.call(env)
+      end
+
+      def new
+        initializers.run
+        self
+      end
+    end
+
+    initializer :initialize_rails do
+      Rails.initializers.run
+    end
+
+    # Set the <tt>$LOAD_PATH</tt> based on the value of
+    # Configuration#load_paths. Duplicates are removed.
+    initializer :set_load_path do
+      config.paths.add_to_load_path
+      $LOAD_PATH.uniq!
+    end
+
+    # Bail if boot.rb is outdated
+    initializer :freak_out_if_boot_rb_is_outdated do
+      unless defined?(Rails::BOOTSTRAP_VERSION)
+        abort %{Your config/boot.rb is outdated: Run "rake rails:update".}
+      end
+    end
+
+    # Requires all frameworks specified by the Configuration#frameworks
+    # list. By default, all frameworks (Active Record, Active Support,
+    # Action Pack, Action Mailer, and Active Resource) are loaded.
+    initializer :require_frameworks do
+      begin
+        require 'active_support'
+        require 'active_support/core_ext/kernel/reporting'
+        require 'active_support/core_ext/logger'
+
+        # TODO: This is here to make Sam Ruby's tests pass. Needs discussion.
+        require 'active_support/core_ext/numeric/bytes'
+        config.frameworks.each { |framework| require(framework.to_s) }
+      rescue LoadError => e
+        # Re-raise as RuntimeError because Mongrel would swallow LoadError.
+        raise e.to_s
+      end
+    end
+
+    # Set the paths from which Rails will automatically load source files, and
+    # the load_once paths.
+    initializer :set_autoload_paths do
+      require 'active_support/dependencies'
+      ActiveSupport::Dependencies.load_paths = config.load_paths.uniq
+      ActiveSupport::Dependencies.load_once_paths = config.load_once_paths.uniq
+
+      extra = ActiveSupport::Dependencies.load_once_paths - ActiveSupport::Dependencies.load_paths
+      unless extra.empty?
+        abort <<-end_error
+          load_once_paths must be a subset of the load_paths.
+          Extra items in load_once_paths: #{extra * ','}
+        end_error
+      end
+
+      # Freeze the arrays so future modifications will fail rather than do nothing mysteriously
+      config.load_once_paths.freeze
+    end
+
+    # Adds all load paths from plugins to the global set of load paths, so that
+    # code from plugins can be required (explicitly or automatically via ActiveSupport::Dependencies).
+    initializer :add_plugin_load_paths do
+      require 'active_support/dependencies'
+      plugin_loader.add_plugin_load_paths
+    end
+
+    # Create tmp directories
+    initializer :ensure_tmp_directories_exist do
+      %w(cache pids sessions sockets).each do |dir_to_make|
+        FileUtils.mkdir_p(File.join(config.root_path, 'tmp', dir_to_make))
+      end
+    end
+
+    # Loads the environment specified by Configuration#environment_path, which
+    # is typically one of development, test, or production.
+    initializer :load_environment do
+      silence_warnings do
+        next if @environment_loaded
+        next unless File.file?(config.environment_path)
+
+        @environment_loaded = true
+        constants = self.class.constants
+
+        eval(IO.read(config.environment_path), binding, config.environment_path)
+
+        (self.class.constants - constants).each do |const|
+          Object.const_set(const, self.class.const_get(const))
+        end
+      end
+    end
+
+    initializer :add_gem_load_paths do
+      require 'rails/gem_dependency'
+      Rails::GemDependency.add_frozen_gem_path
+      unless config.gems.empty?
+        require "rubygems"
+        config.gems.each { |gem| gem.add_load_paths }
+      end
+    end
+
+    # Preload all frameworks specified by the Configuration#frameworks.
+    # Used by Passenger to ensure everything's loaded before forking and
+    # to avoid autoload race conditions in JRuby.
+    initializer :preload_frameworks do
+      if config.preload_frameworks
+        config.frameworks.each do |framework|
+          # String#classify and #constantize aren't available yet.
+          toplevel = Object.const_get(framework.to_s.gsub(/(?:^|_)(.)/) { $1.upcase })
+          toplevel.load_all! if toplevel.respond_to?(:load_all!)
+        end
+      end
+    end
+
+    # This initialization routine does nothing unless <tt>:active_record</tt>
+    # is one of the frameworks to load (Configuration#frameworks). If it is,
+    # this sets the database configuration from Configuration#database_configuration
+    # and then establishes the connection.
+    initializer :initialize_database do
+      if config.frameworks.include?(:active_record)
+        ActiveRecord::Base.configurations = config.database_configuration
+        ActiveRecord::Base.establish_connection
+      end
+    end
+
+    # Include middleware to serve up static assets
+    initializer :initialize_static_server do
+      if config.frameworks.include?(:action_controller) && config.serve_static_assets
+        config.middleware.use(ActionDispatch::Static, Rails.public_path)
+      end
+    end
+
+    initializer :initialize_middleware_stack do
+      if config.frameworks.include?(:action_controller)
+        config.middleware.use(::Rack::Lock) unless ActionController::Base.allow_concurrency
+        config.middleware.use(ActionDispatch::ShowExceptions, ActionController::Base.consider_all_requests_local)
+        config.middleware.use(ActionDispatch::Callbacks, ActionController::Dispatcher.prepare_each_request)
+        config.middleware.use(lambda { ActionController::Base.session_store }, lambda { ActionController::Base.session_options })
+        config.middleware.use(ActionDispatch::ParamsParser)
+        config.middleware.use(::Rack::MethodOverride)
+        config.middleware.use(::Rack::Head)
+        config.middleware.use(ActionDispatch::StringCoercion)
+      end
+    end
+
+    initializer :initialize_cache do
+      unless defined?(RAILS_CACHE)
+        silence_warnings { Object.const_set "RAILS_CACHE", ActiveSupport::Cache.lookup_store(config.cache_store) }
+
+        if RAILS_CACHE.respond_to?(:middleware)
+          # Insert middleware to setup and teardown local cache for each request
+          config.middleware.insert_after(:"Rack::Lock", RAILS_CACHE.middleware)
+        end
+      end
+    end
+
+    initializer :initialize_framework_caches do
+      if config.frameworks.include?(:action_controller)
+        ActionController::Base.cache_store ||= RAILS_CACHE
+      end
+    end
+
+    initializer :initialize_logger do
+      # if the environment has explicitly defined a logger, use it
+      next if Rails.logger
+
+      unless logger = config.logger
+        begin
+          logger = ActiveSupport::BufferedLogger.new(config.log_path)
+          logger.level = ActiveSupport::BufferedLogger.const_get(config.log_level.to_s.upcase)
+          if RAILS_ENV == "production"
+            logger.auto_flushing = false
+          end
+        rescue StandardError => e
+          logger = ActiveSupport::BufferedLogger.new(STDERR)
+          logger.level = ActiveSupport::BufferedLogger::WARN
+          logger.warn(
+            "Rails Error: Unable to access log file. Please ensure that #{config.log_path} exists and is chmod 0666. " +
+            "The log level has been raised to WARN and the output directed to STDERR until the problem is fixed."
+          )
+        end
+      end
+
+      # TODO: Why are we silencing warning here?
+      silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger }
+    end
+
+    # Sets the logger for Active Record, Action Controller, and Action Mailer
+    # (but only for those frameworks that are to be loaded). If the framework's
+    # logger is already set, it is not changed, otherwise it is set to use
+    # RAILS_DEFAULT_LOGGER.
+    initializer :initialize_framework_logging do
+      for framework in ([ :active_record, :action_controller, :action_mailer ] & config.frameworks)
+        framework.to_s.camelize.constantize.const_get("Base").logger ||= Rails.logger
+      end
+
+      ActiveSupport::Dependencies.logger ||= Rails.logger
+      Rails.cache.logger ||= Rails.logger
+    end
+
+    # Sets the dependency loading mechanism based on the value of
+    # Configuration#cache_classes.
+    initializer :initialize_dependency_mechanism do
+      # TODO: Remove files from the $" and always use require
+      ActiveSupport::Dependencies.mechanism = config.cache_classes ? :require : :load
+    end
+
+    # Loads support for "whiny nil" (noisy warnings when methods are invoked
+    # on +nil+ values) if Configuration#whiny_nils is true.
+    initializer :initialize_whiny_nils do
+      require('active_support/whiny_nil') if config.whiny_nils
+    end
+
+    # Sets the default value for Time.zone, and turns on ActiveRecord::Base#time_zone_aware_attributes.
+    # If assigned value cannot be matched to a TimeZone, an exception will be raised.
+    initializer :initialize_time_zone do
+      if config.time_zone
+        zone_default = Time.__send__(:get_zone, config.time_zone)
+
+        unless zone_default
+          raise \
+            'Value assigned to config.time_zone not recognized.' +
+            'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
+        end
+
+        Time.zone_default = zone_default
+
+        if config.frameworks.include?(:active_record)
+          ActiveRecord::Base.time_zone_aware_attributes = true
+          ActiveRecord::Base.default_timezone = :utc
+        end
+      end
+    end
+
+    # Set the i18n configuration from config.i18n but special-case for the load_path which should be
+    # appended to what's already set instead of overwritten.
+    initializer :initialize_i18n do
+      config.i18n.each do |setting, value|
+        if setting == :load_path
+          I18n.load_path += value
+        else
+          I18n.send("#{setting}=", value)
+        end
+      end
+    end
+
+    # Initializes framework-specific settings for each of the loaded frameworks
+    # (Configuration#frameworks). The available settings map to the accessors
+    # on each of the corresponding Base classes.
+    initializer :initialize_framework_settings do
+      config.frameworks.each do |framework|
+        base_class = framework.to_s.camelize.constantize.const_get("Base")
+
+        config.send(framework).each do |setting, value|
+          base_class.send("#{setting}=", value)
+        end
+      end
+      config.active_support.each do |setting, value|
+        ActiveSupport.send("#{setting}=", value)
+      end
     end
 
-    def self.config=(config)
-      @config = config
+    # Sets +ActionController::Base#view_paths+ and +ActionMailer::Base#template_root+
+    # (but only for those frameworks that are to be loaded). If the framework's
+    # paths have already been set, it is not changed, otherwise it is
+    # set to use Configuration#view_path.
+    initializer :initialize_framework_views do
+      if config.frameworks.include?(:action_view)
+        view_path = ActionView::PathSet.type_cast(config.view_path, config.cache_classes)
+        ActionMailer::Base.template_root  = view_path if config.frameworks.include?(:action_mailer) && ActionMailer::Base.view_paths.blank?
+        ActionController::Base.view_paths = view_path if config.frameworks.include?(:action_controller) && ActionController::Base.view_paths.blank?
+      end
     end
 
-    def config
-      self.class.config
+    initializer :initialize_metal do
+      # TODO: Make Rails and metal work without ActionController
+      if config.frameworks.include?(:action_controller)
+        Rails::Rack::Metal.requested_metals = config.metals
+        Rails::Rack::Metal.metal_paths += plugin_loader.engine_metal_paths
+
+        config.middleware.insert_before(
+          :"ActionDispatch::ParamsParser",
+          Rails::Rack::Metal, :if => Rails::Rack::Metal.metals.any?)
+      end
+    end
+
+    initializer :check_for_unbuilt_gems do
+      unbuilt_gems = config.gems.select {|gem| gem.frozen? && !gem.built? }
+      if unbuilt_gems.size > 0
+        # don't print if the gems:build rake tasks are being run
+        unless $gems_build_rake_task
+          abort <<-end_error
+  The following gems have native components that need to be built
+  #{unbuilt_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
+
+  You're running:
+  ruby #{Gem.ruby_version} at #{Gem.ruby}
+  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
+
+  Run `rake gems:build` to build the unbuilt gems.
+          end_error
+        end
+      end
     end
 
-    def routes
-      ActionController::Routing::Routes
+    initializer :load_gems do
+      unless $gems_rake_task
+        config.gems.each { |gem| gem.load }
+      end
+    end
+
+    # Loads all plugins in <tt>config.plugin_paths</tt>.  <tt>plugin_paths</tt>
+    # defaults to <tt>vendor/plugins</tt> but may also be set to a list of
+    # paths, such as
+    #   config.plugin_paths = ["#{RAILS_ROOT}/lib/plugins", "#{RAILS_ROOT}/vendor/plugins"]
+    #
+    # In the default implementation, as each plugin discovered in <tt>plugin_paths</tt> is initialized:
+    # * its +lib+ directory, if present, is added to the load path (immediately after the applications lib directory)
+    # * <tt>init.rb</tt> is evaluated, if present
+    #
+    # After all plugins are loaded, duplicates are removed from the load path.
+    # If an array of plugin names is specified in config.plugins, only those plugins will be loaded
+    # and they plugins will be loaded in that order. Otherwise, plugins are loaded in alphabetical
+    # order.
+    #
+    # if config.plugins ends contains :all then the named plugins will be loaded in the given order and all other
+    # plugins will be loaded in alphabetical order
+    initializer :load_plugins do
+      plugin_loader.load_plugins
+    end
+
+    # TODO: Figure out if this needs to run a second time
+    # load_gems
+
+    initializer :check_gem_dependencies do
+      unloaded_gems = config.gems.reject { |g| g.loaded? }
+      if unloaded_gems.size > 0
+        configuration.gems_dependencies_loaded = false
+        # don't print if the gems rake tasks are being run
+        unless $gems_rake_task
+          abort <<-end_error
+  Missing these required gems:
+  #{unloaded_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
+
+  You're running:
+  ruby #{Gem.ruby_version} at #{Gem.ruby}
+  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
+
+  Run `rake gems:install` to install the missing gems.
+          end_error
+        end
+      else
+        configuration.gems_dependencies_loaded = true
+      end
+    end
+
+    # # bail out if gems are missing - note that check_gem_dependencies will have
+    # # already called abort() unless $gems_rake_task is set
+    # return unless gems_dependencies_loaded
+
+    initializer :load_application_initializers do
+      if config.gems_dependencies_loaded
+        Dir["#{configuration.root_path}/config/initializers/**/*.rb"].sort.each do |initializer|
+          load(initializer)
+        end
+      end
+    end
+
+    # Fires the user-supplied after_initialize block (Configuration#after_initialize)
+    initializer :after_initialize do
+      if config.gems_dependencies_loaded
+        configuration.after_initialize_blocks.each do |block|
+          block.call
+        end
+      end
+    end
+
+    # # Setup database middleware after initializers have run
+    initializer :initialize_database_middleware do
+      if configuration.frameworks.include?(:active_record)
+        if configuration.frameworks.include?(:action_controller) && ActionController::Base.session_store &&
+            ActionController::Base.session_store.name == 'ActiveRecord::SessionStore'
+          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement
+          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::QueryCache
+        else
+          configuration.middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement
+          configuration.middleware.use ActiveRecord::QueryCache
+        end
+      end
+    end
+
+    # TODO: Make a DSL way to limit an initializer to a particular framework
+
+    # # Prepare dispatcher callbacks and run 'prepare' callbacks
+    initializer :prepare_dispatcher do
+      next unless configuration.frameworks.include?(:action_controller)
+      require 'rails/dispatcher' unless defined?(::Dispatcher)
+      Dispatcher.define_dispatcher_callbacks(configuration.cache_classes)
+    end
+
+    # Routing must be initialized after plugins to allow the former to extend the routes
+    # ---
+    # If Action Controller is not one of the loaded frameworks (Configuration#frameworks)
+    # this does nothing. Otherwise, it loads the routing definitions and sets up
+    # loading module used to lazily load controllers (Configuration#controller_paths).
+    initializer :initialize_routing do
+      next unless configuration.frameworks.include?(:action_controller)
+
+      ActionController::Routing.controller_paths += configuration.controller_paths
+      ActionController::Routing::Routes.add_configuration_file(configuration.routes_configuration_file)
+      ActionController::Routing::Routes.reload!
+    end
+    #
+    # # Observers are loaded after plugins in case Observers or observed models are modified by plugins.
+    initializer :load_observers do
+      if config.gems_dependencies_loaded && configuration.frameworks.include?(:active_record)
+        ActiveRecord::Base.instantiate_observers
+      end
+    end
+
+    # Eager load application classes
+    initializer :load_application_classes do
+      next if $rails_rake_task
+
+      if configuration.cache_classes
+        configuration.eager_load_paths.each do |load_path|
+          matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/
+          Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
+            require_dependency file.sub(matcher, '\1')
+          end
+        end
+      end
     end
 
-    def middleware
-      config.middleware
+    # Disable dependency loading during request cycle
+    initializer :disable_dependency_loading do
+      if configuration.cache_classes && !configuration.dependency_loading
+        ActiveSupport::Dependencies.unhook!
+      end
     end
 
-    def call(env)
-      @app ||= middleware.build(routes)
-      @app.call(env)
+    # Configure generators if they were already loaded
+    # ===
+    # TODO: Does this need to be an initializer here?
+    initializer :initialize_generators do
+      if defined?(Rails::Generators)
+        Rails::Generators.no_color! unless config.generators.colorize_logging
+        Rails::Generators.aliases.deep_merge! config.generators.aliases
+        Rails::Generators.options.deep_merge! config.generators.options
+      end
     end
   end
 end
diff --git a/railties/lib/rails/core.rb b/railties/lib/rails/core.rb
index 4be90de792..929c38bd22 100644
--- a/railties/lib/rails/core.rb
+++ b/railties/lib/rails/core.rb
@@ -15,11 +15,7 @@ module Rails
 
     # The Configuration instance used to configure the Rails environment
     def configuration
-      @@configuration
-    end
-
-    def configuration=(configuration)
-      @@configuration = configuration
+      application.configuration
     end
 
     def initialized?
diff --git a/railties/lib/rails/generators.rb b/railties/lib/rails/generators.rb
index 0419a4e36c..471eb45ee6 100644
--- a/railties/lib/rails/generators.rb
+++ b/railties/lib/rails/generators.rb
@@ -1,4 +1,4 @@
-activesupport_path = "#{File.dirname(__FILE__)}/../../activesupport/lib"
+activesupport_path = "#{File.dirname(__FILE__)}/../../../activesupport/lib"
 $LOAD_PATH.unshift(activesupport_path) if File.directory?(activesupport_path)
 require 'active_support'
 require 'active_support/core_ext/object/blank'
diff --git a/railties/lib/rails/generators/rails/app/templates/config/boot.rb b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
index 52086fbc7d..6e0e2279cd 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/boot.rb
+++ b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
@@ -40,20 +40,20 @@ module Rails
 
   class Boot
     def run
-      load_initializer
       set_load_paths
+      load_initializer
     end
 
     def set_load_paths
       %w(
-        railties
-        railties/lib
-        activesupport/lib
+        actionmailer/lib
         actionpack/lib
+        activemodel/lib
         activerecord/lib
-        actionmailer/lib
         activeresource/lib
-        actionwebservice/lib
+        activesupport/lib
+        railties/lib
+        railties
       ).reverse_each do |path|
         path = "#{framework_root_path}/#{path}"
         $LOAD_PATH.unshift(path) if File.directory?(path)
@@ -68,7 +68,6 @@ module Rails
 
   class VendorBoot < Boot
     def load_initializer
-      $:.unshift("#{framework_root_path}/railties/lib")
       require "rails"
       install_gem_spec_stubs
       Rails::GemDependency.add_frozen_gem_path
diff --git a/railties/lib/rails/initializable.rb b/railties/lib/rails/initializable.rb
new file mode 100644
index 0000000000..4bd5088207
--- /dev/null
+++ b/railties/lib/rails/initializable.rb
@@ -0,0 +1,99 @@
+module Rails
+  module Initializable
+
+    # A collection of initializers
+    class Collection
+      def initialize(context)
+        @context = context
+        @keys    = []
+        @values  = {}
+        @ran     = false
+      end
+
+      def run
+        return self if @ran
+        each do |key, initializer|
+          @context.class_eval(&initializer.block)
+        end
+        @ran = true
+        self
+      end
+
+      def [](key)
+        keys, values = merge_with_parent
+        values[key.to_sym]
+      end
+
+      def []=(key, value)
+        key = key.to_sym
+        @keys |= [key]
+        @values[key] = value
+      end
+
+      def each
+        keys, values = merge_with_parent
+        keys.each { |k| yield k, values[k] }
+        self
+      end
+
+    protected
+
+      attr_reader :keys, :values
+
+    private
+
+      def merge_with_parent
+        keys, values = [], {}
+
+        if @context.is_a?(Class) && @context.superclass.is_a?(Initializable)
+          parent = @context.superclass.initializers
+          keys, values = parent.keys, parent.values
+        end
+
+        values = values.merge(@values)
+        return keys | @keys, values
+      end
+
+    end
+
+    class Initializer
+      attr_reader :name, :options, :block
+
+      def initialize(name, options = {}, &block)
+        @name, @options, @block = name, options, block
+      end
+    end
+
+    def initializer(name, options = {}, &block)
+      @initializers ||= Collection.new(self)
+      @initializers[name] = Initializer.new(name, options, &block)
+    end
+
+    def initializers
+      @initializers ||= Collection.new(self)
+    end
+
+  end
+
+  extend Initializable
+
+  # Check for valid Ruby version (1.8.2 or 1.8.4 or higher). This is done in an
+  # external file, so we can use it from the `rails` program as well without duplication.
+  initializer :check_ruby_version do
+    require 'rails/ruby_version_check'
+  end
+
+  # For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
+  # multibyte safe operations. Plugin authors supporting other encodings
+  # should override this behaviour and set the relevant +default_charset+
+  # on ActionController::Base.
+  #
+  # For Ruby 1.9, UTF-8 is the default internal and external encoding.
+  initializer :initialize_encoding do
+    if RUBY_VERSION < '1.9'
+      $KCODE='u'
+    else
+      Encoding.default_external = Encoding::UTF_8
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/lib/rails/initializer.rb b/railties/lib/rails/initializer.rb
index c2d6e1609f..f7c3774450 100644
--- a/railties/lib/rails/initializer.rb
+++ b/railties/lib/rails/initializer.rb
@@ -1,5 +1,6 @@
 require "pathname"
 
+require 'rails/initializable'
 require 'rails/application'
 require 'rails/railties_path'
 require 'rails/version'
@@ -12,572 +13,16 @@ require 'rails/configuration'
 RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV)
 
 module Rails
-  # Sanity check to make sure this file is only loaded once
-  # TODO: Get to the point where this can be removed.
-  raise "It looks like initializer.rb was required twice" if defined?(Initializer)
-
   class Initializer
     class Error < StandardError ; end
-
-    class Base
-      class << self
-        def run(&blk)
-          define_method(:run, &blk)
-        end
-
-        def config=(config)
-          @@config = config
-        end
-
-        def config
-          @@config || Configuration.new
-        end
-        alias configuration config
-
-        def gems_dependencies_loaded
-          config.gems_dependencies_loaded
-        end
-
-        def plugin_loader
-          @plugin_loader ||= configuration.plugin_loader.new(self)
-        end
-      end
-
-      def gems_dependencies_loaded
-        self.class.gems_dependencies_loaded
-      end
-
-      def plugin_loader
-        self.class.plugin_loader
-      end
-    end
-
-    class Runner
-
-      attr_reader :names, :initializers
-      attr_accessor :config
-      alias configuration config
-
-      def initialize(parent = nil)
-        @names        = parent ? parent.names.dup        : {}
-        @initializers = parent ? parent.initializers.dup : []
-      end
-
-      def add(name, options = {}, &block)
-        # If :before or :after is specified, set the index to the right spot
-        if other = options[:before] || options[:after]
-          raise Error, "The #{other.inspect} initializer does not exist" unless @names[other]
-          index = @initializers.index(@names[other])
-          index += 1 if options[:after]
-        end
-
-        @initializers.insert(index || -1, block)
-        @names[name] = block
-      end
-
-      def delete(name)
-        @names[name].tap do |initializer|
-          @initializers.delete(initializer)
-          @names.delete(name)
-        end
-      end
-
-      def run_initializer(initializer)
-        init_block = initializer.is_a?(Proc) ? initializer : @names[initializer]
-        container = Class.new(Base, &init_block).new
-        container.run if container.respond_to?(:run)
-      end
-
-      def run(initializer = nil)
-        Rails.configuration = Base.config = @config
-
-        if initializer
-          run_initializer(initializer)
-        else
-          @initializers.each {|block| run_initializer(block) }
-        end
-      end
-    end
-
-    def self.default
-      @default ||= Runner.new
-    end
-
     def self.run(initializer = nil, config = nil)
-      # TODO: Clean this all up
       if initializer
-        default.config = config
-        default.run(initializer)
+        # Deprecated
       else
         Rails.application = Class.new(Application)
         yield Rails.application.config if block_given?
-        default.config = Rails.application.config
-        default.run
-      end
-    end
-  end
-
-  # Check for valid Ruby version (1.8.2 or 1.8.4 or higher). This is done in an
-  # external file, so we can use it from the `rails` program as well without duplication.
-  Initializer.default.add :check_ruby_version do
-    require 'rails/ruby_version_check'
-  end
-
-  # Bail if boot.rb is outdated
-  Initializer.default.add :freak_out_if_boot_rb_is_outdated do
-    unless defined?(Rails::BOOTSTRAP_VERSION)
-      abort %{Your config/boot.rb is outdated: Run "rake rails:update".}
-    end
-  end
-
-  # Set the <tt>$LOAD_PATH</tt> based on the value of
-  # Configuration#load_paths. Duplicates are removed.
-  Initializer.default.add :set_load_path do
-    configuration.paths.add_to_load_path
-    $LOAD_PATH.uniq!
-  end
-
-  # Requires all frameworks specified by the Configuration#frameworks
-  # list. By default, all frameworks (Active Record, Active Support,
-  # Action Pack, Action Mailer, and Active Resource) are loaded.
-  Initializer.default.add :require_frameworks do
-    begin
-      require 'active_support'
-      require 'active_support/core_ext/kernel/reporting'
-      require 'active_support/core_ext/logger'
-
-      # TODO: This is here to make Sam Ruby's tests pass. Needs discussion.
-      require 'active_support/core_ext/numeric/bytes'
-      configuration.frameworks.each { |framework| require(framework.to_s) }
-    rescue LoadError => e
-      # Re-raise as RuntimeError because Mongrel would swallow LoadError.
-      raise e.to_s
-    end
-  end
-
-  # Set the paths from which Rails will automatically load source files, and
-  # the load_once paths.
-  Initializer.default.add :set_autoload_paths do
-    require 'active_support/dependencies'
-    ActiveSupport::Dependencies.load_paths = configuration.load_paths.uniq
-    ActiveSupport::Dependencies.load_once_paths = configuration.load_once_paths.uniq
-
-    extra = ActiveSupport::Dependencies.load_once_paths - ActiveSupport::Dependencies.load_paths
-    unless extra.empty?
-      abort <<-end_error
-        load_once_paths must be a subset of the load_paths.
-        Extra items in load_once_paths: #{extra * ','}
-      end_error
-    end
-
-    # Freeze the arrays so future modifications will fail rather than do nothing mysteriously
-    configuration.load_once_paths.freeze
-  end
-
-  # Adds all load paths from plugins to the global set of load paths, so that
-  # code from plugins can be required (explicitly or automatically via ActiveSupport::Dependencies).
-  Initializer.default.add :add_plugin_load_paths do
-    require 'active_support/dependencies'
-    plugin_loader.add_plugin_load_paths
-  end
-
-  # Create tmp directories
-  Initializer.default.add :ensure_tmp_directories_exist do
-    %w(cache pids sessions sockets).each do |dir_to_make|
-      FileUtils.mkdir_p(File.join(configuration.root_path, 'tmp', dir_to_make))
-    end
-  end
-
-  # Loads the environment specified by Configuration#environment_path, which
-  # is typically one of development, test, or production.
-  Initializer.default.add :load_environment do
-    silence_warnings do
-      next if @environment_loaded
-      next unless File.file?(configuration.environment_path)
-
-      @environment_loaded = true
-
-      config = configuration
-      constants = self.class.constants
-
-      eval(IO.read(configuration.environment_path), binding, configuration.environment_path)
-
-      (self.class.constants - constants).each do |const|
-        Object.const_set(const, self.class.const_get(const))
-      end
-    end
-  end
-
-  Initializer.default.add :add_gem_load_paths do
-    require 'rails/gem_dependency'
-    Rails::GemDependency.add_frozen_gem_path
-    unless config.gems.empty?
-      require "rubygems"
-      config.gems.each { |gem| gem.add_load_paths }
-    end
-  end
-
-  # Preload all frameworks specified by the Configuration#frameworks.
-  # Used by Passenger to ensure everything's loaded before forking and
-  # to avoid autoload race conditions in JRuby.
-  Initializer.default.add :preload_frameworks do
-    if configuration.preload_frameworks
-      configuration.frameworks.each do |framework|
-        # String#classify and #constantize aren't available yet.
-        toplevel = Object.const_get(framework.to_s.gsub(/(?:^|_)(.)/) { $1.upcase })
-        toplevel.load_all! if toplevel.respond_to?(:load_all!)
-      end
-    end
-  end
-
-  # For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
-  # multibyte safe operations. Plugin authors supporting other encodings
-  # should override this behaviour and set the relevant +default_charset+
-  # on ActionController::Base.
-  #
-  # For Ruby 1.9, UTF-8 is the default internal and external encoding.
-  Initializer.default.add :initialize_encoding do
-    if RUBY_VERSION < '1.9'
-      $KCODE='u'
-    else
-      Encoding.default_external = Encoding::UTF_8
-    end
-  end
-
-  # This initialization routine does nothing unless <tt>:active_record</tt>
-  # is one of the frameworks to load (Configuration#frameworks). If it is,
-  # this sets the database configuration from Configuration#database_configuration
-  # and then establishes the connection.
-  Initializer.default.add :initialize_database do
-    if configuration.frameworks.include?(:active_record)
-      ActiveRecord::Base.configurations = configuration.database_configuration
-      ActiveRecord::Base.establish_connection
-    end
-  end
-
-  # Include middleware to serve up static assets
-  Initializer.default.add :initialize_static_server do
-    if configuration.frameworks.include?(:action_controller) && configuration.serve_static_assets
-      configuration.middleware.use(ActionDispatch::Static, Rails.public_path)
-    end
-  end
-
-  Initializer.default.add :initialize_middleware_stack do
-    if configuration.frameworks.include?(:action_controller)
-      configuration.middleware.use(::Rack::Lock) unless ActionController::Base.allow_concurrency
-      configuration.middleware.use(ActionDispatch::ShowExceptions, ActionController::Base.consider_all_requests_local)
-      configuration.middleware.use(ActionDispatch::Callbacks, ActionController::Dispatcher.prepare_each_request)
-      configuration.middleware.use(lambda { ActionController::Base.session_store }, lambda { ActionController::Base.session_options })
-      configuration.middleware.use(ActionDispatch::ParamsParser)
-      configuration.middleware.use(::Rack::MethodOverride)
-      configuration.middleware.use(::Rack::Head)
-      configuration.middleware.use(ActionDispatch::StringCoercion)
-    end
-  end
-
-  Initializer.default.add :initialize_cache do
-    unless defined?(RAILS_CACHE)
-      silence_warnings { Object.const_set "RAILS_CACHE", ActiveSupport::Cache.lookup_store(configuration.cache_store) }
-
-      if RAILS_CACHE.respond_to?(:middleware)
-        # Insert middleware to setup and teardown local cache for each request
-        configuration.middleware.insert_after(:"Rack::Lock", RAILS_CACHE.middleware)
-      end
-    end
-  end
-
-  Initializer.default.add :initialize_framework_caches do
-    if configuration.frameworks.include?(:action_controller)
-      ActionController::Base.cache_store ||= RAILS_CACHE
-    end
-  end
-
-  Initializer.default.add :initialize_logger do
-    # if the environment has explicitly defined a logger, use it
-    next if Rails.logger
-
-    unless logger = configuration.logger
-      begin
-        logger = ActiveSupport::BufferedLogger.new(configuration.log_path)
-        logger.level = ActiveSupport::BufferedLogger.const_get(configuration.log_level.to_s.upcase)
-        if RAILS_ENV == "production"
-          logger.auto_flushing = false
-        end
-      rescue StandardError => e
-        logger = ActiveSupport::BufferedLogger.new(STDERR)
-        logger.level = ActiveSupport::BufferedLogger::WARN
-        logger.warn(
-          "Rails Error: Unable to access log file. Please ensure that #{configuration.log_path} exists and is chmod 0666. " +
-          "The log level has been raised to WARN and the output directed to STDERR until the problem is fixed."
-        )
+        Rails.application.new
       end
     end
-
-    # TODO: Why are we silencing warning here?
-    silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger }
-  end
-
-  # Sets the logger for Active Record, Action Controller, and Action Mailer
-  # (but only for those frameworks that are to be loaded). If the framework's
-  # logger is already set, it is not changed, otherwise it is set to use
-  # RAILS_DEFAULT_LOGGER.
-  Initializer.default.add :initialize_framework_logging do
-    for framework in ([ :active_record, :action_controller, :action_mailer ] & configuration.frameworks)
-      framework.to_s.camelize.constantize.const_get("Base").logger ||= Rails.logger
-    end
-
-    ActiveSupport::Dependencies.logger ||= Rails.logger
-    Rails.cache.logger ||= Rails.logger
-  end
-
-  # Sets the dependency loading mechanism based on the value of
-  # Configuration#cache_classes.
-  Initializer.default.add :initialize_dependency_mechanism do
-    # TODO: Remove files from the $" and always use require
-    ActiveSupport::Dependencies.mechanism = configuration.cache_classes ? :require : :load
-  end
-
-  # Loads support for "whiny nil" (noisy warnings when methods are invoked
-  # on +nil+ values) if Configuration#whiny_nils is true.
-  Initializer.default.add :initialize_whiny_nils do
-    require('active_support/whiny_nil') if configuration.whiny_nils
-  end
-
-
-  # Sets the default value for Time.zone, and turns on ActiveRecord::Base#time_zone_aware_attributes.
-  # If assigned value cannot be matched to a TimeZone, an exception will be raised.
-  Initializer.default.add :initialize_time_zone do
-    if configuration.time_zone
-      zone_default = Time.__send__(:get_zone, configuration.time_zone)
-
-      unless zone_default
-        raise \
-          'Value assigned to config.time_zone not recognized.' +
-          'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
-      end
-
-      Time.zone_default = zone_default
-
-      if configuration.frameworks.include?(:active_record)
-        ActiveRecord::Base.time_zone_aware_attributes = true
-        ActiveRecord::Base.default_timezone = :utc
-      end
-    end
-  end
-
-  # Set the i18n configuration from config.i18n but special-case for the load_path which should be
-  # appended to what's already set instead of overwritten.
-  Initializer.default.add :initialize_i18n do
-    configuration.i18n.each do |setting, value|
-      if setting == :load_path
-        I18n.load_path += value
-      else
-        I18n.send("#{setting}=", value)
-      end
-    end
-  end
-
-  # Initializes framework-specific settings for each of the loaded frameworks
-  # (Configuration#frameworks). The available settings map to the accessors
-  # on each of the corresponding Base classes.
-  Initializer.default.add :initialize_framework_settings do
-    configuration.frameworks.each do |framework|
-      base_class = framework.to_s.camelize.constantize.const_get("Base")
-
-      configuration.send(framework).each do |setting, value|
-        base_class.send("#{setting}=", value)
-      end
-    end
-    configuration.active_support.each do |setting, value|
-      ActiveSupport.send("#{setting}=", value)
-    end
-  end
-
-  # Sets +ActionController::Base#view_paths+ and +ActionMailer::Base#template_root+
-  # (but only for those frameworks that are to be loaded). If the framework's
-  # paths have already been set, it is not changed, otherwise it is
-  # set to use Configuration#view_path.
-  Initializer.default.add :initialize_framework_views do
-    if configuration.frameworks.include?(:action_view)
-      view_path = ActionView::PathSet.type_cast(configuration.view_path)
-      ActionMailer::Base.template_root  = view_path if configuration.frameworks.include?(:action_mailer) && ActionMailer::Base.view_paths.blank?
-      ActionController::Base.view_paths = view_path if configuration.frameworks.include?(:action_controller) && ActionController::Base.view_paths.blank?
-    end
-  end
-
-  Initializer.default.add :initialize_metal do
-    # TODO: Make Rails and metal work without ActionController
-    if defined?(ActionController)
-      Rails::Rack::Metal.requested_metals = configuration.metals
-      Rails::Rack::Metal.metal_paths += plugin_loader.engine_metal_paths
-
-      configuration.middleware.insert_before(
-        :"ActionDispatch::ParamsParser",
-        Rails::Rack::Metal, :if => Rails::Rack::Metal.metals.any?)
-    end
-  end
-
-  Initializer.default.add :check_for_unbuilt_gems do
-    unbuilt_gems = config.gems.select {|gem| gem.frozen? && !gem.built? }
-    if unbuilt_gems.size > 0
-      # don't print if the gems:build rake tasks are being run
-      unless $gems_build_rake_task
-        abort <<-end_error
-The following gems have native components that need to be built
-#{unbuilt_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
-
-You're running:
-ruby #{Gem.ruby_version} at #{Gem.ruby}
-rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
-
-Run `rake gems:build` to build the unbuilt gems.
-        end_error
-      end
-    end
-  end
-
-  Initializer.default.add :load_gems do
-    unless $gems_rake_task
-      config.gems.each { |gem| gem.load }
-    end
-  end
-
-  # Loads all plugins in <tt>config.plugin_paths</tt>.  <tt>plugin_paths</tt>
-  # defaults to <tt>vendor/plugins</tt> but may also be set to a list of
-  # paths, such as
-  #   config.plugin_paths = ["#{RAILS_ROOT}/lib/plugins", "#{RAILS_ROOT}/vendor/plugins"]
-  #
-  # In the default implementation, as each plugin discovered in <tt>plugin_paths</tt> is initialized:
-  # * its +lib+ directory, if present, is added to the load path (immediately after the applications lib directory)
-  # * <tt>init.rb</tt> is evaluated, if present
-  #
-  # After all plugins are loaded, duplicates are removed from the load path.
-  # If an array of plugin names is specified in config.plugins, only those plugins will be loaded
-  # and they plugins will be loaded in that order. Otherwise, plugins are loaded in alphabetical
-  # order.
-  #
-  # if config.plugins ends contains :all then the named plugins will be loaded in the given order and all other
-  # plugins will be loaded in alphabetical order
-  Initializer.default.add :load_plugins do
-    plugin_loader.load_plugins
-  end
-
-  # TODO: Figure out if this needs to run a second time
-  # load_gems
-
-  Initializer.default.add :check_gem_dependencies do
-    unloaded_gems = config.gems.reject { |g| g.loaded? }
-    if unloaded_gems.size > 0
-      configuration.gems_dependencies_loaded = false
-      # don't print if the gems rake tasks are being run
-      unless $gems_rake_task
-        abort <<-end_error
-Missing these required gems:
-#{unloaded_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
-
-You're running:
-ruby #{Gem.ruby_version} at #{Gem.ruby}
-rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
-
-Run `rake gems:install` to install the missing gems.
-        end_error
-      end
-    else
-      configuration.gems_dependencies_loaded = true
-    end
-  end
-
-  # # bail out if gems are missing - note that check_gem_dependencies will have
-  # # already called abort() unless $gems_rake_task is set
-  # return unless gems_dependencies_loaded
-
-  Initializer.default.add :load_application_initializers do
-    if gems_dependencies_loaded
-      Dir["#{configuration.root_path}/config/initializers/**/*.rb"].sort.each do |initializer|
-        load(initializer)
-      end
-    end
-  end
-
-  # Fires the user-supplied after_initialize block (Configuration#after_initialize)
-  Initializer.default.add :after_initialize do
-    if gems_dependencies_loaded
-      configuration.after_initialize_blocks.each do |block|
-        block.call
-      end
-    end
-  end
-
-  # # Setup database middleware after initializers have run
-  Initializer.default.add :initialize_database_middleware do
-    if configuration.frameworks.include?(:active_record)
-      if configuration.frameworks.include?(:action_controller) && ActionController::Base.session_store &&
-          ActionController::Base.session_store.name == 'ActiveRecord::SessionStore'
-        configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement
-        configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::QueryCache
-      else
-        configuration.middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement
-        configuration.middleware.use ActiveRecord::QueryCache
-      end
-    end
-  end
-
-  # TODO: Make a DSL way to limit an initializer to a particular framework
-
-  # # Prepare dispatcher callbacks and run 'prepare' callbacks
-  Initializer.default.add :prepare_dispatcher do
-    next unless configuration.frameworks.include?(:action_controller)
-    require 'rails/dispatcher' unless defined?(::Dispatcher)
-    Dispatcher.define_dispatcher_callbacks(configuration.cache_classes)
-  end
-
-  # Routing must be initialized after plugins to allow the former to extend the routes
-  # ---
-  # If Action Controller is not one of the loaded frameworks (Configuration#frameworks)
-  # this does nothing. Otherwise, it loads the routing definitions and sets up
-  # loading module used to lazily load controllers (Configuration#controller_paths).
-  Initializer.default.add :initialize_routing do
-    next unless configuration.frameworks.include?(:action_controller)
-
-    ActionController::Routing.controller_paths += configuration.controller_paths
-    ActionController::Routing::Routes.add_configuration_file(configuration.routes_configuration_file)
-    ActionController::Routing::Routes.reload!
-  end
-  #
-  # # Observers are loaded after plugins in case Observers or observed models are modified by plugins.
-  Initializer.default.add :load_observers do
-    if gems_dependencies_loaded && configuration.frameworks.include?(:active_record)
-      ActiveRecord::Base.instantiate_observers
-    end
-  end
-
-  # Eager load application classes
-  Initializer.default.add :load_application_classes do
-    next if $rails_rake_task
-
-    if configuration.cache_classes
-      configuration.eager_load_paths.each do |load_path|
-        matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/
-        Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
-          require_dependency file.sub(matcher, '\1')
-        end
-      end
-    end
-  end
-
-  # Disable dependency loading during request cycle
-  Initializer.default.add :disable_dependency_loading do
-    if configuration.cache_classes && !configuration.dependency_loading
-      ActiveSupport::Dependencies.unhook!
-    end
-  end
-
-  # Configure generators if they were already loaded
-  Initializer.default.add :initialize_generators do
-    if defined?(Rails::Generators)
-      Rails::Generators.no_color! unless config.generators.colorize_logging
-      Rails::Generators.aliases.deep_merge! config.generators.aliases
-      Rails::Generators.options.deep_merge! config.generators.options
-    end
   end
 end
diff --git a/railties/lib/rails/initializer_old.rb b/railties/lib/rails/initializer_old.rb
deleted file mode 100644
index cee5c7bcb6..0000000000
--- a/railties/lib/rails/initializer_old.rb
+++ /dev/null
@@ -1,1137 +0,0 @@
-require 'logger'
-require 'set'
-require 'pathname'
-
-$LOAD_PATH.unshift File.dirname(__FILE__)
-require 'railties_path'
-require 'rails/version'
-require 'rails/gem_dependency'
-require 'rails/rack'
-
-RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV)
-
-module Rails
-  class << self
-    # The Configuration instance used to configure the Rails environment
-    def configuration
-      @@configuration
-    end
-
-    def configuration=(configuration)
-      @@configuration = configuration
-    end
-
-    def initialized?
-      @initialized || false
-    end
-
-    def initialized=(initialized)
-      @initialized ||= initialized
-    end
-
-    def logger
-      if defined?(RAILS_DEFAULT_LOGGER)
-        RAILS_DEFAULT_LOGGER
-      else
-        nil
-      end
-    end
-
-    def backtrace_cleaner
-      @@backtrace_cleaner ||= begin
-        # Relies on ActiveSupport, so we have to lazy load to postpone definition until AS has been loaded
-        require 'rails/backtrace_cleaner'
-        Rails::BacktraceCleaner.new
-      end
-    end
-
-    def root
-      Pathname.new(RAILS_ROOT) if defined?(RAILS_ROOT)
-    end
-
-    def env
-      @_env ||= ActiveSupport::StringInquirer.new(RAILS_ENV)
-    end
-
-    def cache
-      RAILS_CACHE
-    end
-
-    def version
-      VERSION::STRING
-    end
-
-    def public_path
-      @@public_path ||= self.root ? File.join(self.root, "public") : "public"
-    end
-
-    def public_path=(path)
-      @@public_path = path
-    end
-  end
-
-  # The Initializer is responsible for processing the Rails configuration, such
-  # as setting the $LOAD_PATH, requiring the right frameworks, initializing
-  # logging, and more. It can be run either as a single command that'll just
-  # use the default configuration, like this:
-  #
-  #   Rails::Initializer.run
-  #
-  # But normally it's more interesting to pass in a custom configuration
-  # through the block running:
-  #
-  #   Rails::Initializer.run do |config|
-  #     config.frameworks -= [ :action_mailer ]
-  #   end
-  #
-  # This will use the default configuration options from Rails::Configuration,
-  # but allow for overwriting on select areas.
-  class Initializer
-    # The Configuration instance used by this Initializer instance.
-    attr_reader :configuration
-
-    # The set of loaded plugins.
-    attr_reader :loaded_plugins
-
-    # Whether or not all the gem dependencies have been met
-    attr_reader :gems_dependencies_loaded
-
-    # Runs the initializer. By default, this will invoke the #process method,
-    # which simply executes all of the initialization routines. Alternately,
-    # you can specify explicitly which initialization routine you want:
-    #
-    #   Rails::Initializer.run(:set_load_path)
-    #
-    # This is useful if you only want the load path initialized, without
-    # incurring the overhead of completely loading the entire environment.
-    def self.run(command = :process, configuration = Configuration.new)
-      yield configuration if block_given?
-      initializer = new configuration
-      initializer.send(command)
-      initializer
-    end
-
-    # Create a new Initializer instance that references the given Configuration
-    # instance.
-    def initialize(configuration)
-      @configuration = configuration
-      @loaded_plugins = []
-    end
-
-    # Sequentially step through all of the available initialization routines,
-    # in order (view execution order in source).
-    def process
-      Rails.configuration = configuration
-
-      check_ruby_version
-      install_gem_spec_stubs
-      set_load_path
-      add_gem_load_paths
-
-      require_frameworks
-      set_autoload_paths
-      add_plugin_load_paths
-      load_environment
-      preload_frameworks
-
-      initialize_encoding
-      initialize_database
-
-      initialize_cache
-      initialize_framework_caches
-
-      initialize_logger
-      initialize_framework_logging
-
-      initialize_dependency_mechanism
-      initialize_whiny_nils
-
-      initialize_time_zone
-      initialize_i18n
-
-      initialize_framework_settings
-      initialize_framework_views
-
-      initialize_metal
-
-      add_support_load_paths
-
-      check_for_unbuilt_gems
-
-      load_gems
-      load_plugins
-
-      # pick up any gems that plugins depend on
-      add_gem_load_paths
-      load_gems
-      check_gem_dependencies
-
-      # bail out if gems are missing - note that check_gem_dependencies will have
-      # already called abort() unless $gems_rake_task is set
-      return unless gems_dependencies_loaded
-
-      load_application_initializers
-
-      # the framework is now fully initialized
-      after_initialize
-
-      # Setup database middleware after initializers have run
-      initialize_database_middleware
-
-      # Prepare dispatcher callbacks and run 'prepare' callbacks
-      prepare_dispatcher
-
-      # Routing must be initialized after plugins to allow the former to extend the routes
-      initialize_routing
-
-      # Observers are loaded after plugins in case Observers or observed models are modified by plugins.
-      load_observers
-
-      # Load view path cache
-      load_view_paths
-
-      # Load application classes
-      load_application_classes
-
-      # Disable dependency loading during request cycle
-      disable_dependency_loading
-
-      # Flag initialized
-      Rails.initialized = true
-    end
-
-    # Check for valid Ruby version
-    # This is done in an external file, so we can use it
-    # from the `rails` program as well without duplication.
-    def check_ruby_version
-      require 'ruby_version_check'
-    end
-
-    # If Rails is vendored and RubyGems is available, install stub GemSpecs
-    # for Rails, Active Support, Active Record, Action Pack, Action Mailer, and
-    # Active Resource. This allows Gem plugins to depend on Rails even when
-    # the Gem version of Rails shouldn't be loaded.
-    def install_gem_spec_stubs
-      unless Rails.respond_to?(:vendor_rails?)
-        abort %{Your config/boot.rb is outdated: Run "rake rails:update".}
-      end
-
-      if Rails.vendor_rails?
-        begin; require "rubygems"; rescue LoadError; return; end
-
-        stubs = %w(rails activesupport activerecord actionpack actionmailer activeresource)
-        stubs.reject! { |s| Gem.loaded_specs.key?(s) }
-
-        stubs.each do |stub|
-          Gem.loaded_specs[stub] = Gem::Specification.new do |s|
-            s.name = stub
-            s.version = Rails::VERSION::STRING
-            s.loaded_from = ""
-          end
-        end
-      end
-    end
-
-    # Set the <tt>$LOAD_PATH</tt> based on the value of
-    # Configuration#load_paths. Duplicates are removed.
-    def set_load_path
-      load_paths = configuration.load_paths + configuration.framework_paths
-      load_paths.reverse_each { |dir| $LOAD_PATH.unshift(dir) if File.directory?(dir) }
-      $LOAD_PATH.uniq!
-    end
-
-    # Set the paths from which Rails will automatically load source files, and
-    # the load_once paths.
-    def set_autoload_paths
-      require 'active_support/dependencies'
-      ActiveSupport::Dependencies.load_paths = configuration.load_paths.uniq
-      ActiveSupport::Dependencies.load_once_paths = configuration.load_once_paths.uniq
-
-      extra = ActiveSupport::Dependencies.load_once_paths - ActiveSupport::Dependencies.load_paths
-      unless extra.empty?
-        abort <<-end_error
-          load_once_paths must be a subset of the load_paths.
-          Extra items in load_once_paths: #{extra * ','}
-        end_error
-      end
-
-      # Freeze the arrays so future modifications will fail rather than do nothing mysteriously
-      configuration.load_once_paths.freeze
-    end
-
-    # Requires all frameworks specified by the Configuration#frameworks
-    # list. By default, all frameworks (Active Record, Active Support,
-    # Action Pack, Action Mailer, and Active Resource) are loaded.
-    def require_frameworks
-      require 'active_support/all'
-      configuration.frameworks.each { |framework| require(framework.to_s) }
-    rescue LoadError => e
-      # Re-raise as RuntimeError because Mongrel would swallow LoadError.
-      raise e.to_s
-    end
-
-    # Preload all frameworks specified by the Configuration#frameworks.
-    # Used by Passenger to ensure everything's loaded before forking and
-    # to avoid autoload race conditions in JRuby.
-    def preload_frameworks
-      if configuration.preload_frameworks
-        configuration.frameworks.each do |framework|
-          # String#classify and #constantize aren't available yet.
-          toplevel = Object.const_get(framework.to_s.gsub(/(?:^|_)(.)/) { $1.upcase })
-          toplevel.load_all! if toplevel.respond_to?(:load_all!)
-        end
-      end
-    end
-
-    # Add the load paths used by support functions such as the info controller
-    def add_support_load_paths
-    end
-
-    # Adds all load paths from plugins to the global set of load paths, so that
-    # code from plugins can be required (explicitly or automatically via ActiveSupport::Dependencies).
-    def add_plugin_load_paths
-      require 'active_support/dependencies'
-      plugin_loader.add_plugin_load_paths
-    end
-
-    def add_gem_load_paths
-      require 'rails/gem_dependency'
-      Rails::GemDependency.add_frozen_gem_path
-      unless @configuration.gems.empty?
-        require "rubygems"
-        @configuration.gems.each { |gem| gem.add_load_paths }
-      end
-    end
-
-    def load_gems
-      unless $gems_rake_task
-        @configuration.gems.each { |gem| gem.load }
-      end
-    end
-
-    def check_for_unbuilt_gems
-      unbuilt_gems = @configuration.gems.select {|gem| gem.frozen? && !gem.built? }
-      if unbuilt_gems.size > 0
-        # don't print if the gems:build rake tasks are being run
-        unless $gems_build_rake_task
-          abort <<-end_error
-The following gems have native components that need to be built
-  #{unbuilt_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
-
-You're running:
-  ruby #{Gem.ruby_version} at #{Gem.ruby}
-  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
-
-Run `rake gems:build` to build the unbuilt gems.
-          end_error
-        end
-      end
-    end
-
-    def check_gem_dependencies
-      unloaded_gems = @configuration.gems.reject { |g| g.loaded? }
-      if unloaded_gems.size > 0
-        @gems_dependencies_loaded = false
-        # don't print if the gems rake tasks are being run
-        unless $gems_rake_task
-          abort <<-end_error
-Missing these required gems:
-  #{unloaded_gems.map { |gemm| "#{gemm.name}  #{gemm.requirement}" } * "\n  "}
-
-You're running:
-  ruby #{Gem.ruby_version} at #{Gem.ruby}
-  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}
-
-Run `rake gems:install` to install the missing gems.
-          end_error
-        end
-      else
-        @gems_dependencies_loaded = true
-      end
-    end
-
-    # Loads all plugins in <tt>config.plugin_paths</tt>.  <tt>plugin_paths</tt>
-    # defaults to <tt>vendor/plugins</tt> but may also be set to a list of
-    # paths, such as
-    #   config.plugin_paths = ["#{RAILS_ROOT}/lib/plugins", "#{RAILS_ROOT}/vendor/plugins"]
-    #
-    # In the default implementation, as each plugin discovered in <tt>plugin_paths</tt> is initialized:
-    # * its +lib+ directory, if present, is added to the load path (immediately after the applications lib directory)
-    # * <tt>init.rb</tt> is evaluated, if present
-    #
-    # After all plugins are loaded, duplicates are removed from the load path.
-    # If an array of plugin names is specified in config.plugins, only those plugins will be loaded
-    # and they plugins will be loaded in that order. Otherwise, plugins are loaded in alphabetical
-    # order.
-    #
-    # if config.plugins ends contains :all then the named plugins will be loaded in the given order and all other
-    # plugins will be loaded in alphabetical order
-    def load_plugins
-      plugin_loader.load_plugins
-    end
-
-    def plugin_loader
-      @plugin_loader ||= configuration.plugin_loader.new(self)
-    end
-
-    # Loads the environment specified by Configuration#environment_path, which
-    # is typically one of development, test, or production.
-    def load_environment
-      silence_warnings do
-        return if @environment_loaded
-        @environment_loaded = true
-
-        config = configuration
-        constants = self.class.constants
-
-        eval(IO.read(configuration.environment_path), binding, configuration.environment_path)
-
-        (self.class.constants - constants).each do |const|
-          Object.const_set(const, self.class.const_get(const))
-        end
-      end
-    end
-
-    def load_observers
-      if gems_dependencies_loaded && configuration.frameworks.include?(:active_record)
-        ActiveRecord::Base.instantiate_observers
-      end
-    end
-
-    def load_view_paths
-      if configuration.frameworks.include?(:action_view)
-        if configuration.cache_classes
-          view_path = ActionView::FileSystemResolverWithFallback.new(configuration.view_path)
-          ActionController::Base.view_paths = view_path if configuration.frameworks.include?(:action_controller)
-          ActionMailer::Base.template_root = view_path if configuration.frameworks.include?(:action_mailer)
-        end
-      end
-    end
-
-    # Eager load application classes
-    def load_application_classes
-      return if $rails_rake_task
-      if configuration.cache_classes
-        configuration.eager_load_paths.each do |load_path|
-          matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/
-          Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
-            require_dependency file.sub(matcher, '\1')
-          end
-        end
-      end
-    end
-
-    # For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
-    # multibyte safe operations. Plugin authors supporting other encodings
-    # should override this behaviour and set the relevant +default_charset+
-    # on ActionController::Base.
-    #
-    # For Ruby 1.9, UTF-8 is the default internal and external encoding.
-    def initialize_encoding
-      if RUBY_VERSION < '1.9'
-        $KCODE='u'
-      else
-        Encoding.default_internal = Encoding::UTF_8
-        Encoding.default_external = Encoding::UTF_8
-      end
-    end
-
-    # This initialization routine does nothing unless <tt>:active_record</tt>
-    # is one of the frameworks to load (Configuration#frameworks). If it is,
-    # this sets the database configuration from Configuration#database_configuration
-    # and then establishes the connection.
-    def initialize_database
-      if configuration.frameworks.include?(:active_record)
-        ActiveRecord::Base.configurations = configuration.database_configuration
-        ActiveRecord::Base.establish_connection
-      end
-    end
-
-    def initialize_database_middleware
-      if configuration.frameworks.include?(:active_record)
-        if configuration.frameworks.include?(:action_controller) &&
-            ActionController::Base.session_store.name == 'ActiveRecord::SessionStore'
-          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement
-          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::QueryCache
-        else
-          configuration.middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement
-          configuration.middleware.use ActiveRecord::QueryCache
-        end
-      end
-    end
-
-    def initialize_cache
-      unless defined?(RAILS_CACHE)
-        silence_warnings { Object.const_set "RAILS_CACHE", ActiveSupport::Cache.lookup_store(configuration.cache_store) }
-
-        if RAILS_CACHE.respond_to?(:middleware)
-          # Insert middleware to setup and teardown local cache for each request
-          configuration.middleware.insert_after(:"Rack::Lock", RAILS_CACHE.middleware)
-        end
-      end
-    end
-
-    def initialize_framework_caches
-      if configuration.frameworks.include?(:action_controller)
-        ActionController::Base.cache_store ||= RAILS_CACHE
-      end
-    end
-
-    # If the RAILS_DEFAULT_LOGGER constant is already set, this initialization
-    # routine does nothing. If the constant is not set, and Configuration#logger
-    # is not +nil+, this also does nothing. Otherwise, a new logger instance
-    # is created at Configuration#log_path, with a default log level of
-    # Configuration#log_level.
-    #
-    # If the log could not be created, the log will be set to output to
-    # +STDERR+, with a log level of +WARN+.
-    def initialize_logger
-      # if the environment has explicitly defined a logger, use it
-      return if Rails.logger
-
-      unless logger = configuration.logger
-        begin
-          logger = ActiveSupport::BufferedLogger.new(configuration.log_path)
-          logger.level = ActiveSupport::BufferedLogger.const_get(configuration.log_level.to_s.upcase)
-          if configuration.environment == "production"
-            logger.auto_flushing = false
-          end
-        rescue StandardError => e
-          logger = ActiveSupport::BufferedLogger.new(STDERR)
-          logger.level = ActiveSupport::BufferedLogger::WARN
-          logger.warn(
-            "Rails Error: Unable to access log file. Please ensure that #{configuration.log_path} exists and is chmod 0666. " +
-            "The log level has been raised to WARN and the output directed to STDERR until the problem is fixed."
-          )
-        end
-      end
-
-      silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger }
-    end
-
-    # Sets the logger for Active Record, Action Controller, and Action Mailer
-    # (but only for those frameworks that are to be loaded). If the framework's
-    # logger is already set, it is not changed, otherwise it is set to use
-    # RAILS_DEFAULT_LOGGER.
-    def initialize_framework_logging
-      for framework in ([ :active_record, :action_controller, :action_mailer ] & configuration.frameworks)
-        framework.to_s.camelize.constantize.const_get("Base").logger ||= Rails.logger
-      end
-
-      ActiveSupport::Dependencies.logger ||= Rails.logger
-      Rails.cache.logger ||= Rails.logger
-    end
-
-    # Sets +ActionController::Base#view_paths+ and +ActionMailer::Base#template_root+
-    # (but only for those frameworks that are to be loaded). If the framework's
-    # paths have already been set, it is not changed, otherwise it is
-    # set to use Configuration#view_path.
-    def initialize_framework_views
-      if configuration.frameworks.include?(:action_view)
-        view_path = ActionView::PathSet.type_cast(configuration.view_path)
-        ActionMailer::Base.template_root  = view_path if configuration.frameworks.include?(:action_mailer) && ActionMailer::Base.view_paths.blank?
-        ActionController::Base.view_paths = view_path if configuration.frameworks.include?(:action_controller) && ActionController::Base.view_paths.blank?
-      end
-    end
-
-    # If Action Controller is not one of the loaded frameworks (Configuration#frameworks)
-    # this does nothing. Otherwise, it loads the routing definitions and sets up
-    # loading module used to lazily load controllers (Configuration#controller_paths).
-    def initialize_routing
-      return unless configuration.frameworks.include?(:action_controller)
-
-      ActionController::Routing.controller_paths += configuration.controller_paths
-      ActionController::Routing::Routes.add_configuration_file(configuration.routes_configuration_file)
-      ActionController::Routing::Routes.reload!
-    end
-
-    # Sets the dependency loading mechanism based on the value of
-    # Configuration#cache_classes.
-    def initialize_dependency_mechanism
-      ActiveSupport::Dependencies.mechanism = configuration.cache_classes ? :require : :load
-    end
-
-    # Loads support for "whiny nil" (noisy warnings when methods are invoked
-    # on +nil+ values) if Configuration#whiny_nils is true.
-    def initialize_whiny_nils
-      require('active_support/whiny_nil') if configuration.whiny_nils
-    end
-
-    # Sets the default value for Time.zone, and turns on ActiveRecord::Base#time_zone_aware_attributes.
-    # If assigned value cannot be matched to a TimeZone, an exception will be raised.
-    def initialize_time_zone
-      if configuration.time_zone
-        zone_default = Time.__send__(:get_zone, configuration.time_zone)
-
-        unless zone_default
-          raise \
-            'Value assigned to config.time_zone not recognized.' +
-            'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
-        end
-
-        Time.zone_default = zone_default
-
-        if configuration.frameworks.include?(:active_record)
-          ActiveRecord::Base.time_zone_aware_attributes = true
-          ActiveRecord::Base.default_timezone = :utc
-        end
-      end
-    end
-
-    # Set the i18n configuration from config.i18n but special-case for the load_path which should be
-    # appended to what's already set instead of overwritten.
-    def initialize_i18n
-      configuration.i18n.each do |setting, value|
-        if setting == :load_path
-          I18n.load_path += value
-        else
-          I18n.send("#{setting}=", value)
-        end
-      end
-    end
-
-    def initialize_metal
-      Rails::Rack::Metal.requested_metals = configuration.metals
-      Rails::Rack::Metal.metal_paths += plugin_loader.engine_metal_paths
-
-      configuration.middleware.insert_before(
-        :"ActionDispatch::ParamsParser",
-        Rails::Rack::Metal, :if => Rails::Rack::Metal.metals.any?)
-    end
-
-    # Initializes framework-specific settings for each of the loaded frameworks
-    # (Configuration#frameworks). The available settings map to the accessors
-    # on each of the corresponding Base classes.
-    def initialize_framework_settings
-      configuration.frameworks.each do |framework|
-        base_class = framework.to_s.camelize.constantize.const_get("Base")
-
-        configuration.send(framework).each do |setting, value|
-          base_class.send("#{setting}=", value)
-        end
-      end
-      configuration.active_support.each do |setting, value|
-        ActiveSupport.send("#{setting}=", value)
-      end
-    end
-
-    # Fires the user-supplied after_initialize block (Configuration#after_initialize)
-    def after_initialize
-      if gems_dependencies_loaded
-        configuration.after_initialize_blocks.each do |block|
-          block.call
-        end
-      end
-    end
-
-    def load_application_initializers
-      if gems_dependencies_loaded
-        Dir["#{configuration.root_path}/config/initializers/**/*.rb"].sort.each do |initializer|
-          load(initializer)
-        end
-      end
-    end
-
-    def prepare_dispatcher
-      return unless configuration.frameworks.include?(:action_controller)
-      require 'dispatcher' unless defined?(::Dispatcher)
-      Dispatcher.define_dispatcher_callbacks(configuration.cache_classes)
-    end
-
-    def disable_dependency_loading
-      if configuration.cache_classes && !configuration.dependency_loading
-        ActiveSupport::Dependencies.unhook!
-      end
-    end
-  end
-
-  # The Configuration class holds all the parameters for the Initializer and
-  # ships with defaults that suites most Rails applications. But it's possible
-  # to overwrite everything. Usually, you'll create an Configuration file
-  # implicitly through the block running on the Initializer, but it's also
-  # possible to create the Configuration instance in advance and pass it in
-  # like this:
-  #
-  #   config = Rails::Configuration.new
-  #   Rails::Initializer.run(:process, config)
-  class Configuration
-    # The application's base directory.
-    attr_reader :root_path
-
-    # A stub for setting options on ActionController::Base.
-    attr_accessor :action_controller
-
-    # A stub for setting options on ActionMailer::Base.
-    attr_accessor :action_mailer
-
-    # A stub for setting options on ActionView::Base.
-    attr_accessor :action_view
-
-    # A stub for setting options on ActiveRecord::Base.
-    attr_accessor :active_record
-
-    # A stub for setting options on ActiveResource::Base.
-    attr_accessor :active_resource
-
-    # A stub for setting options on ActiveSupport.
-    attr_accessor :active_support
-
-    # Whether to preload all frameworks at startup.
-    attr_accessor :preload_frameworks
-
-    # Whether or not classes should be cached (set to false if you want
-    # application classes to be reloaded on each request)
-    attr_accessor :cache_classes
-
-    # The list of paths that should be searched for controllers. (Defaults
-    # to <tt>app/controllers</tt>.)
-    attr_accessor :controller_paths
-
-    # The path to the database configuration file to use. (Defaults to
-    # <tt>config/database.yml</tt>.)
-    attr_accessor :database_configuration_file
-
-    # The path to the routes configuration file to use. (Defaults to
-    # <tt>config/routes.rb</tt>.)
-    attr_accessor :routes_configuration_file
-
-    # The list of rails framework components that should be loaded. (Defaults
-    # to <tt>:active_record</tt>, <tt>:action_controller</tt>,
-    # <tt>:action_view</tt>, <tt>:action_mailer</tt>, and
-    # <tt>:active_resource</tt>).
-    attr_accessor :frameworks
-
-    # An array of additional paths to prepend to the load path. By default,
-    # all +app+, +lib+, +vendor+ and mock paths are included in this list.
-    attr_accessor :load_paths
-
-    # An array of paths from which Rails will automatically load from only once.
-    # All elements of this array must also be in +load_paths+.
-    attr_accessor :load_once_paths
-
-    # An array of paths from which Rails will eager load on boot if cache
-    # classes is enabled. All elements of this array must also be in
-    # +load_paths+.
-    attr_accessor :eager_load_paths
-
-    # The log level to use for the default Rails logger. In production mode,
-    # this defaults to <tt>:info</tt>. In development mode, it defaults to
-    # <tt>:debug</tt>.
-    attr_accessor :log_level
-
-    # The path to the log file to use. Defaults to log/#{environment}.log
-    # (e.g. log/development.log or log/production.log).
-    attr_accessor :log_path
-
-    # The specific logger to use. By default, a logger will be created and
-    # initialized using #log_path and #log_level, but a programmer may
-    # specifically set the logger to use via this accessor and it will be
-    # used directly.
-    attr_accessor :logger
-
-    # The specific cache store to use. By default, the ActiveSupport::Cache::Store will be used.
-    attr_accessor :cache_store
-
-    # The root of the application's views. (Defaults to <tt>app/views</tt>.)
-    attr_accessor :view_path
-
-    # Set to +true+ if you want to be warned (noisily) when you try to invoke
-    # any method of +nil+. Set to +false+ for the standard Ruby behavior.
-    attr_accessor :whiny_nils
-
-    # The list of plugins to load. If this is set to <tt>nil</tt>, all plugins will
-    # be loaded. If this is set to <tt>[]</tt>, no plugins will be loaded. Otherwise,
-    # plugins will be loaded in the order specified.
-    attr_reader :plugins
-    def plugins=(plugins)
-      @plugins = plugins.nil? ? nil : plugins.map { |p| p.to_sym }
-    end
-
-    # The list of metals to load. If this is set to <tt>nil</tt>, all metals will
-    # be loaded in alphabetical order. If this is set to <tt>[]</tt>, no metals will
-    # be loaded. Otherwise metals will be loaded in the order specified
-    attr_accessor :metals
-
-    # The path to the root of the plugins directory. By default, it is in
-    # <tt>vendor/plugins</tt>.
-    attr_accessor :plugin_paths
-
-    # The classes that handle finding the desired plugins that you'd like to load for
-    # your application. By default it is the Rails::Plugin::FileSystemLocator which finds
-    # plugins to load in <tt>vendor/plugins</tt>. You can hook into gem location by subclassing
-    # Rails::Plugin::Locator and adding it onto the list of <tt>plugin_locators</tt>.
-    attr_accessor :plugin_locators
-
-    # The class that handles loading each plugin. Defaults to Rails::Plugin::Loader, but
-    # a sub class would have access to fine grained modification of the loading behavior. See
-    # the implementation of Rails::Plugin::Loader for more details.
-    attr_accessor :plugin_loader
-
-    # Enables or disables plugin reloading.  You can get around this setting per plugin.
-    # If <tt>reload_plugins?</tt> is false, add this to your plugin's <tt>init.rb</tt>
-    # to make it reloadable:
-    #
-    #   ActiveSupport::Dependencies.load_once_paths.delete lib_path
-    #
-    # If <tt>reload_plugins?</tt> is true, add this to your plugin's <tt>init.rb</tt>
-    # to only load it once:
-    #
-    #   ActiveSupport::Dependencies.load_once_paths << lib_path
-    #
-    attr_accessor :reload_plugins
-
-    # Returns true if plugin reloading is enabled.
-    def reload_plugins?
-      !!@reload_plugins
-    end
-
-    # Enables or disables dependency loading during the request cycle. Setting
-    # <tt>dependency_loading</tt> to true will allow new classes to be loaded
-    # during a request. Setting it to false will disable this behavior.
-    #
-    # Those who want to run in a threaded environment should disable this
-    # option and eager load or require all there classes on initialization.
-    #
-    # If <tt>cache_classes</tt> is disabled, dependency loaded will always be
-    # on.
-    attr_accessor :dependency_loading
-
-    # An array of gems that this rails application depends on.  Rails will automatically load
-    # these gems during installation, and allow you to install any missing gems with:
-    #
-    #   rake gems:install
-    #
-    # You can add gems with the #gem method.
-    attr_accessor :gems
-
-    # Adds a single Gem dependency to the rails application. By default, it will require
-    # the library with the same name as the gem. Use :lib to specify a different name.
-    #
-    #   # gem 'aws-s3', '>= 0.4.0'
-    #   # require 'aws/s3'
-    #   config.gem 'aws-s3', :lib => 'aws/s3', :version => '>= 0.4.0', \
-    #     :source => "http://code.whytheluckystiff.net"
-    #
-    # To require a library be installed, but not attempt to load it, pass :lib => false
-    #
-    #   config.gem 'qrp', :version => '0.4.1', :lib => false
-    def gem(name, options = {})
-      @gems << Rails::GemDependency.new(name, options)
-    end
-
-    # Deprecated options:
-    def breakpoint_server(_ = nil)
-      $stderr.puts %(
-      *******************************************************************
-      * config.breakpoint_server has been deprecated and has no effect. *
-      *******************************************************************
-      )
-    end
-    alias_method :breakpoint_server=, :breakpoint_server
-
-    # Sets the default +time_zone+.  Setting this will enable +time_zone+
-    # awareness for Active Record models and set the Active Record default
-    # timezone to <tt>:utc</tt>.
-    attr_accessor :time_zone
-
-    # Accessor for i18n settings.
-    attr_accessor :i18n
-
-    # Create a new Configuration instance, initialized with the default
-    # values.
-    def initialize
-      set_root_path!
-
-      self.frameworks                   = default_frameworks
-      self.load_paths                   = default_load_paths
-      self.load_once_paths              = default_load_once_paths
-      self.eager_load_paths             = default_eager_load_paths
-      self.log_path                     = default_log_path
-      self.log_level                    = default_log_level
-      self.view_path                    = default_view_path
-      self.controller_paths             = default_controller_paths
-      self.preload_frameworks           = default_preload_frameworks
-      self.cache_classes                = default_cache_classes
-      self.dependency_loading           = default_dependency_loading
-      self.whiny_nils                   = default_whiny_nils
-      self.plugins                      = default_plugins
-      self.plugin_paths                 = default_plugin_paths
-      self.plugin_locators              = default_plugin_locators
-      self.plugin_loader                = default_plugin_loader
-      self.database_configuration_file  = default_database_configuration_file
-      self.routes_configuration_file    = default_routes_configuration_file
-      self.gems                         = default_gems
-      self.i18n                         = default_i18n
-
-      for framework in default_frameworks
-        self.send("#{framework}=", Rails::OrderedOptions.new)
-      end
-      self.active_support = Rails::OrderedOptions.new
-    end
-
-    # Set the root_path to RAILS_ROOT and canonicalize it.
-    def set_root_path!
-      raise 'RAILS_ROOT is not set' unless defined?(::RAILS_ROOT)
-      raise 'RAILS_ROOT is not a directory' unless File.directory?(::RAILS_ROOT)
-
-      @root_path =
-        # Pathname is incompatible with Windows, but Windows doesn't have
-        # real symlinks so File.expand_path is safe.
-        if RUBY_PLATFORM =~ /(:?mswin|mingw)/
-          File.expand_path(::RAILS_ROOT)
-
-        # Otherwise use Pathname#realpath which respects symlinks.
-        else
-          Pathname.new(::RAILS_ROOT).realpath.to_s
-        end
-
-      Object.const_set(:RELATIVE_RAILS_ROOT, ::RAILS_ROOT.dup) unless defined?(::RELATIVE_RAILS_ROOT)
-      ::RAILS_ROOT.replace @root_path
-    end
-
-    # Enable threaded mode. Allows concurrent requests to controller actions and
-    # multiple database connections. Also disables automatic dependency loading
-    # after boot, and disables reloading code on every request, as these are
-    # fundamentally incompatible with thread safety.
-    def threadsafe!
-      self.preload_frameworks = true
-      self.cache_classes = true
-      self.dependency_loading = false
-      self.action_controller.allow_concurrency = true
-      self
-    end
-
-    # Loads and returns the contents of the #database_configuration_file. The
-    # contents of the file are processed via ERB before being sent through
-    # YAML::load.
-    def database_configuration
-      require 'erb'
-      YAML::load(ERB.new(IO.read(database_configuration_file)).result)
-    end
-
-    # The path to the current environment's file (<tt>development.rb</tt>, etc.). By
-    # default the file is at <tt>config/environments/#{environment}.rb</tt>.
-    def environment_path
-      "#{root_path}/config/environments/#{environment}.rb"
-    end
-
-    # Return the currently selected environment. By default, it returns the
-    # value of the RAILS_ENV constant.
-    def environment
-      ::RAILS_ENV
-    end
-
-    # Adds a block which will be executed after rails has been fully initialized.
-    # Useful for per-environment configuration which depends on the framework being
-    # fully initialized.
-    def after_initialize(&after_initialize_block)
-      after_initialize_blocks << after_initialize_block if after_initialize_block
-    end
-
-    # Returns the blocks added with Configuration#after_initialize
-    def after_initialize_blocks
-      @after_initialize_blocks ||= []
-    end
-
-    # Add a preparation callback that will run before every request in development
-    # mode, or before the first request in production.
-    #
-    # See Dispatcher#to_prepare.
-    def to_prepare(&callback)
-      after_initialize do
-        require 'dispatcher' unless defined?(::Dispatcher)
-        Dispatcher.to_prepare(&callback)
-      end
-    end
-
-    def middleware
-      require 'action_controller'
-      ActionController::Dispatcher.middleware
-    end
-
-    def builtin_directories
-      # Include builtins only in the development environment.
-      (environment == 'development') ? Dir["#{RAILTIES_PATH}/builtin/*/"] : []
-    end
-
-    def framework_paths
-      paths = %w(railties railties/lib activesupport/lib)
-      paths << 'actionpack/lib' if frameworks.include?(:action_controller) || frameworks.include?(:action_view)
-
-      [:active_record, :action_mailer, :active_resource, :action_web_service].each do |framework|
-        paths << "#{framework.to_s.gsub('_', '')}/lib" if frameworks.include?(framework)
-      end
-
-      paths.map { |dir| "#{framework_root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
-    end
-
-    private
-      def framework_root_path
-        defined?(::RAILS_FRAMEWORK_ROOT) ? ::RAILS_FRAMEWORK_ROOT : "#{root_path}/vendor/rails"
-      end
-
-      def default_frameworks
-        [ :active_record, :action_controller, :action_view, :action_mailer, :active_resource ]
-      end
-
-      def default_load_paths
-        paths = []
-
-        # Add the old mock paths only if the directories exists
-        paths.concat(Dir["#{root_path}/test/mocks/#{environment}"]) if File.exists?("#{root_path}/test/mocks/#{environment}")
-
-        # Add the app's controller directory
-        paths.concat(Dir["#{root_path}/app/controllers/"])
-
-        # Followed by the standard includes.
-        paths.concat %w(
-          app
-          app/metal
-          app/models
-          app/controllers
-          app/helpers
-          app/services
-          lib
-          vendor
-        ).map { |dir| "#{root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
-
-        paths.concat builtin_directories
-      end
-
-      # Doesn't matter since plugins aren't in load_paths yet.
-      def default_load_once_paths
-        []
-      end
-
-      def default_eager_load_paths
-        %w(
-          app/metal
-          app/models
-          app/controllers
-          app/helpers
-        ).map { |dir| "#{root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
-      end
-
-      def default_log_path
-        File.join(root_path, 'log', "#{environment}.log")
-      end
-
-      def default_log_level
-        environment == 'production' ? :info : :debug
-      end
-
-      def default_database_configuration_file
-        File.join(root_path, 'config', 'database.yml')
-      end
-
-      def default_routes_configuration_file
-        File.join(root_path, 'config', 'routes.rb')
-      end
-
-      def default_view_path
-        File.join(root_path, 'app', 'views')
-      end
-
-      def default_controller_paths
-        paths = [File.join(root_path, 'app', 'controllers')]
-        paths.concat builtin_directories
-        paths
-      end
-
-      def default_dependency_loading
-        true
-      end
-
-      def default_preload_frameworks
-        false
-      end
-
-      def default_cache_classes
-        true
-      end
-
-      def default_whiny_nils
-        false
-      end
-
-      def default_plugins
-        nil
-      end
-
-      def default_plugin_paths
-        ["#{root_path}/vendor/plugins"]
-      end
-
-      def default_plugin_locators
-        require 'rails/plugin/locator'
-        locators = []
-        locators << Plugin::GemLocator if defined? Gem
-        locators << Plugin::FileSystemLocator
-      end
-
-      def default_plugin_loader
-        require 'rails/plugin/loader'
-        Plugin::Loader
-      end
-
-      def default_cache_store
-        if File.exist?("#{root_path}/tmp/cache/")
-          [ :file_store, "#{root_path}/tmp/cache/" ]
-        else
-          :memory_store
-        end
-      end
-
-      def default_gems
-        []
-      end
-
-      def default_i18n
-        i18n = Rails::OrderedOptions.new
-        i18n.load_path = []
-
-        if File.exist?(File.join(RAILS_ROOT, 'config', 'locales'))
-          i18n.load_path << Dir[File.join(RAILS_ROOT, 'config', 'locales', '*.{rb,yml}')]
-          i18n.load_path.flatten!
-        end
-
-        i18n
-      end
-  end
-end
-
-# Needs to be duplicated from Active Support since its needed before Active
-# Support is available. Here both Options and Hash are namespaced to prevent
-# conflicts with other implementations AND with the classes residing in Active Support.
-class Rails::OrderedOptions < Array #:nodoc:
-  def []=(key, value)
-    key = key.to_sym
-
-    if pair = find_pair(key)
-      pair.pop
-      pair << value
-    else
-      self << [key, value]
-    end
-  end
-
-  def [](key)
-    pair = find_pair(key.to_sym)
-    pair ? pair.last : nil
-  end
-
-  def method_missing(name, *args)
-    if name.to_s =~ /(.*)=$/
-      self[$1.to_sym] = args.first
-    else
-      self[name]
-    end
-  end
-
-  private
-    def find_pair(key)
-      self.each { |i| return i if i.first == key }
-      return false
-    end
-end
-
diff --git a/railties/test/application/generators_test.rb b/railties/test/application/generators_test.rb
new file mode 100644
index 0000000000..0d6eb4147a
--- /dev/null
+++ b/railties/test/application/generators_test.rb
@@ -0,0 +1,89 @@
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  class GeneratorsTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      require "rails/generators"
+      build_app
+      boot_rails
+    end
+
+    test "generators default values" do
+      Rails::Initializer.run do |c|
+        assert_equal(true, c.generators.colorize_logging)
+        assert_equal({}, c.generators.aliases)
+        assert_equal({}, c.generators.options)
+      end
+    end
+
+    test "generators set rails options" do
+      Rails::Initializer.run do |c|
+        c.generators.orm            = :datamapper
+        c.generators.test_framework = :rspec
+        expected = { :rails => { :orm => :datamapper, :test_framework => :rspec } }
+        assert_equal(expected, c.generators.options)
+      end
+    end
+
+    test "generators set rails aliases" do
+      Rails::Initializer.run do |c|
+        c.generators.aliases = { :rails => { :test_framework => "-w" } }
+        expected = { :rails => { :test_framework => "-w" } }
+        assert_equal expected, c.generators.aliases
+      end
+    end
+
+    test "generators aliases and options on initialization" do
+      Rails::Initializer.run do |c|
+        c.generators.rails :aliases => { :test_framework => "-w" }
+        c.generators.orm :datamapper
+        c.generators.test_framework :rspec
+      end
+
+      assert_equal :rspec, Rails::Generators.options[:rails][:test_framework]
+      assert_equal "-w", Rails::Generators.aliases[:rails][:test_framework]
+    end
+
+    test "generators no color on initialization" do
+      Rails::Initializer.run do |c|
+        c.generators.colorize_logging = false
+      end
+
+      assert_equal Thor::Base.shell, Thor::Shell::Basic
+    end
+
+    test "generators with hashes for options and aliases" do
+      Rails::Initializer.run do |c|
+        c.generators do |g|
+          g.orm    :datamapper, :migration => false
+          g.plugin :aliases => { :generator => "-g" },
+                   :generator => true
+        end
+
+        expected = {
+          :rails => { :orm => :datamapper },
+          :plugin => { :generator => true },
+          :datamapper => { :migration => false }
+        }
+
+        assert_equal expected, c.generators.options
+        assert_equal({ :plugin => { :generator => "-g" } }, c.generators.aliases)
+      end
+    end
+
+    test "generators with hashes are deep merged" do
+      Rails::Initializer.run do |c|
+        c.generators do |g|
+          g.orm    :datamapper, :migration => false
+          g.plugin :aliases => { :generator => "-g" },
+                   :generator => true
+        end
+      end
+
+      assert Rails::Generators.aliases.size >= 1
+      assert Rails::Generators.options.size >= 1
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/test/application/initializer_test.rb b/railties/test/application/initializer_test.rb
new file mode 100644
index 0000000000..f46bf2b656
--- /dev/null
+++ b/railties/test/application/initializer_test.rb
@@ -0,0 +1,194 @@
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  class InitializerTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app
+      boot_rails
+    end
+
+    test "initializing an application initializes rails" do
+      class MyApp < Rails::Application ; end
+
+      if RUBY_VERSION < '1.9'
+        $KCODE = ''
+        MyApp.new
+        assert_equal 'UTF8', $KCODE
+      else
+        Encoding.default_external = Encoding::US_ASCII
+        MyApp.new
+        assert_equal Encoding::UTF_8, Encoding.default_external
+      end
+    end
+
+    test "initializing an application adds the application paths to the load path" do
+      class MyApp < Rails::Application ; end
+
+      MyApp.new
+      assert $:.include?("#{app_path}/app/models")
+    end
+
+    test "adding an unknown framework raises an error" do
+      class MyApp < Rails::Application
+        config.frameworks << :action_foo
+      end
+
+      assert_raises RuntimeError do
+        MyApp.new
+      end
+    end
+
+    test "eager loading loads parent classes before children" do
+      app_file "lib/zoo.rb", <<-ZOO
+        class Zoo ; include ReptileHouse ; end
+      ZOO
+      app_file "lib/zoo/reptile_house.rb", <<-ZOO
+        module Zoo::ReptileHouse ; end
+      ZOO
+
+      Rails::Initializer.run do |config|
+        config.eager_load_paths = "#{app_path}/lib"
+      end
+
+      assert Zoo
+    end
+
+    test "load environment with global" do
+      app_file "config/environments/development.rb", "$initialize_test_set_from_env = 'success'"
+      assert_nil $initialize_test_set_from_env
+      Rails::Initializer.run { }
+      assert_equal "success", $initialize_test_set_from_env
+    end
+
+    test "action_controller load paths set only if action controller in use" do
+      assert_nothing_raised NameError do
+        Rails::Initializer.run do |config|
+          config.frameworks = []
+        end
+      end
+    end
+
+    test "action_pack is added to the load path if action_controller is required" do
+      Rails::Initializer.run do |config|
+        config.frameworks = [:action_controller]
+      end
+
+      assert $:.include?("#{framework_path}/actionpack/lib")
+    end
+
+    test "action_pack is added to the load path if action_view is required" do
+      Rails::Initializer.run do |config|
+        config.frameworks = [:action_view]
+      end
+
+      assert $:.include?("#{framework_path}/actionpack/lib")
+    end
+
+    test "after_initialize block works correctly" do
+      Rails::Initializer.run do |config|
+        config.after_initialize { $test_after_initialize_block1 = "success" }
+        config.after_initialize { $test_after_initialize_block2 = "congratulations" }
+      end
+
+      assert_equal "success", $test_after_initialize_block1
+      assert_equal "congratulations", $test_after_initialize_block2
+    end
+
+    test "after_initialize block works correctly when no block is passed" do
+      Rails::Initializer.run do |config|
+        config.after_initialize { $test_after_initialize_block1 = "success" }
+        config.after_initialize # don't pass a block, this is what we're testing!
+        config.after_initialize { $test_after_initialize_block2 = "congratulations" }
+      end
+
+      assert_equal "success", $test_after_initialize_block1
+      assert_equal "congratulations", $test_after_initialize_block2
+    end
+
+    # i18n
+    test "setting another default locale" do
+      Rails::Initializer.run do |config|
+        config.i18n.default_locale = :de
+      end
+      assert_equal :de, I18n.default_locale
+    end
+
+    test "no config locales dir present should return empty load path" do
+      FileUtils.rm_rf "#{app_path}/config/locales"
+      Rails::Initializer.run do |c|
+        assert_equal [], c.i18n.load_path
+      end
+    end
+
+    test "config locales dir present should be added to load path" do
+      Rails::Initializer.run do |c|
+        assert_equal ["#{app_path}/config/locales/en.yml"], c.i18n.load_path
+      end
+    end
+
+    test "config defaults should be added with config settings" do
+      Rails::Initializer.run do |c|
+        c.i18n.load_path << "my/other/locale.yml"
+      end
+
+      assert_equal [
+        "#{app_path}/config/locales/en.yml", "my/other/locale.yml"
+      ], Rails.application.config.i18n.load_path
+    end
+
+    # DB middleware
+    test "database middleware doesn't initialize when session store is not active_record" do
+      Rails::Initializer.run do |config|
+        config.action_controller.session_store = :cookie_store
+      end
+
+      assert !Rails.application.config.middleware.include?(ActiveRecord::SessionStore)
+    end
+
+    test "database middleware doesn't initialize when activerecord is not in frameworks" do
+      Rails::Initializer.run do |c|
+        c.frameworks = []
+      end
+      assert_equal [], Rails.application.config.middleware
+    end
+
+    test "database middleware initializes when session store is active record" do
+      Rails::Initializer.run do |c|
+        c.action_controller.session_store = :active_record_store
+      end
+
+      expects = [ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActiveRecord::SessionStore]
+      middleware = Rails.application.config.middleware.map { |m| m.klass }
+      assert_equal expects, middleware & expects
+    end
+
+    test "ensure database middleware doesn't use action_controller on initializing" do
+      Rails::Initializer.run do |c|
+        c.frameworks -= [:action_controller]
+        c.action_controller.session_store = :active_record_store
+      end
+
+      assert !Rails.application.config.middleware.include?(ActiveRecord::SessionStore)
+    end
+
+    # Pathview test
+    test "load view paths doesn't perform anything when action_view not in frameworks" do
+      Rails::Initializer.run do |c|
+        c.frameworks -= [:action_view]
+      end
+      assert_equal nil, ActionMailer::Base.template_root
+      assert_equal [], ActionController::Base.view_paths
+    end
+
+    # Rails root test
+    test "Rails.root == RAILS_ROOT" do
+      assert_equal RAILS_ROOT, Rails.root.to_s
+    end
+
+    test "Rails.root should be a Pathname" do
+      assert_instance_of Pathname, Rails.root
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/test/application/load_test.rb b/railties/test/application/load_test.rb
index 305cd7f273..5c3d35fb16 100644
--- a/railties/test/application/load_test.rb
+++ b/railties/test/application/load_test.rb
@@ -40,14 +40,14 @@ module ApplicationTests
 
     test "Rails.application is available after config.ru has been racked up" do
       rackup
-      assert Rails.application.new.is_a?(Rails::Application)
+      assert Rails.application.new < Rails::Application
     end
 
     # Passenger still uses AC::Dispatcher, so we need to
     # keep it working for now
     test "deprecated ActionController::Dispatcher still works" do
       rackup
-      assert ActionController::Dispatcher.new.is_a?(Rails::Application)
+      assert ActionController::Dispatcher.new < Rails::Application
     end
 
     test "the config object is available on the application object" do
diff --git a/railties/test/application/plugins_test.rb b/railties/test/application/plugins_test.rb
new file mode 100644
index 0000000000..81e7f4d88c
--- /dev/null
+++ b/railties/test/application/plugins_test.rb
@@ -0,0 +1,101 @@
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  class PluginTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def assert_plugins(list_of_names, array_of_plugins, message=nil)
+      assert_equal list_of_names.map { |n| n.to_s }, array_of_plugins.map { |p| p.name }, message
+    end
+
+    def setup
+      build_app
+      boot_rails
+      @failure_tip = "It's likely someone has added a new plugin fixture without updating this list"
+      # Tmp hax to get tests working
+      FileUtils.cp_r "#{File.dirname(__FILE__)}/../fixtures/plugins", "#{app_path}/vendor"
+    end
+
+    test "all plugins are loaded when registered plugin list is untouched" do
+      Rails::Initializer.run { }
+      assert_plugins [
+        :a, :acts_as_chunky_bacon, :engine, :gemlike, :plugin_with_no_lib_dir, :stubby
+      ], Rails.application.config.loaded_plugins, @failure_tip
+    end
+
+    test "no plugins are loaded if the configuration has an empty plugin list" do
+      Rails::Initializer.run { |c| c.plugins = [] }
+      assert_plugins [], Rails.application.config.loaded_plugins
+    end
+
+    test "only the specified plugins are located in the order listed" do
+      plugin_names = [:plugin_with_no_lib_dir, :acts_as_chunky_bacon]
+      Rails::Initializer.run { |c| c.plugins = plugin_names }
+      assert_plugins plugin_names, Rails.application.config.loaded_plugins
+    end
+
+    test "all plugins loaded after all" do
+      Rails::Initializer.run do |config|
+        config.plugins = [:stubby, :all, :acts_as_chunky_bacon]
+      end
+      assert_plugins [:stubby, :a, :engine, :gemlike, :plugin_with_no_lib_dir, :acts_as_chunky_bacon], Rails.application.config.loaded_plugins, @failure_tip
+    end
+
+    test "plugin names may be strings" do
+      plugin_names = ['stubby', 'acts_as_chunky_bacon', :a, :plugin_with_no_lib_dir]
+      Rails::Initializer.run do |config|
+        config.plugins = ['stubby', 'acts_as_chunky_bacon', :a, :plugin_with_no_lib_dir]
+      end
+
+      assert_plugins plugin_names, Rails.application.config.loaded_plugins, @failure_tip
+    end
+
+    test "all plugins loaded when all is used" do
+      Rails::Initializer.run do |config|
+        config.plugins = [:stubby, :acts_as_chunky_bacon, :all]
+      end
+      
+      assert_plugins [:stubby, :acts_as_chunky_bacon, :a, :engine, :gemlike, :plugin_with_no_lib_dir], Rails.application.config.loaded_plugins, @failure_tip
+    end
+
+    test "all loaded plugins are added to the load paths" do
+      Rails::Initializer.run do |config|
+        config.plugins = [:stubby, :acts_as_chunky_bacon]
+      end
+
+      assert $LOAD_PATH.include?("#{app_path}/vendor/plugins/default/stubby/lib")
+      assert $LOAD_PATH.include?("#{app_path}/vendor/plugins/default/acts/acts_as_chunky_bacon/lib")
+    end
+
+    test "registering a plugin name that does not exist raises a load error" do
+      assert_raise(LoadError) do
+        Rails::Initializer.run do |config|
+          config.plugins = [:stubby, :acts_as_a_non_existant_plugin]
+        end
+      end
+    end
+
+    test "load error messages mention missing plugins and no others" do
+      valid_plugins   = [:stubby, :acts_as_chunky_bacon]
+      invalid_plugins = [:non_existant_plugin1, :non_existant_plugin2]
+
+      begin
+        Rails::Initializer.run do |config|
+          config.plugins = [:stubby, :acts_as_chunky_bacon, :non_existant_plugin1, :non_existant_plugin2]
+        end
+        flunk "Expected a LoadError but did not get one"
+      rescue LoadError => e
+        assert_plugins valid_plugins, Rails.application.config.loaded_plugins, @failure_tip
+
+        invalid_plugins.each do |plugin|
+          assert_match(/#{plugin.to_s}/, e.message, "LoadError message should mention plugin '#{plugin}'")
+        end
+
+        valid_plugins.each do |plugin|
+          assert_no_match(/#{plugin.to_s}/, e.message, "LoadError message should not mention '#{plugin}'")
+        end
+      end
+    end
+
+  end
+end
\ No newline at end of file
diff --git a/railties/test/initializable_test.rb b/railties/test/initializable_test.rb
new file mode 100644
index 0000000000..7c8aed00c9
--- /dev/null
+++ b/railties/test/initializable_test.rb
@@ -0,0 +1,68 @@
+require 'abstract_unit'
+require 'rails/initializable'
+
+module InitializableTests
+
+  class Foo
+    extend Rails::Initializable
+
+    class << self
+      attr_accessor :foo, :bar
+    end
+
+    initializer :omg do
+      @foo ||= 0
+      @foo += 1
+    end
+  end
+
+  class Bar < Foo
+    initializer :bar do
+      @bar ||= 0
+      @bar += 1
+    end
+  end
+
+  module Word
+    extend Rails::Initializable
+
+    initializer :word do
+      $word = "bird"
+    end
+  end
+
+  class Basic < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    test "initializers run" do
+      Foo.initializers.run
+      assert_equal 1, Foo.foo
+    end
+
+    test "initializers are inherited" do
+      Bar.initializers.run
+      assert_equal [1, 1], [Bar.foo, Bar.bar]
+    end
+
+    test "initializers only get run once" do
+      Foo.initializers.run
+      Foo.initializers.run
+      assert_equal 1, Foo.foo
+    end
+
+    test "running initializers on children does not effect the parent" do
+      Bar.initializers.run
+      assert_nil Foo.foo
+      assert_nil Foo.bar
+    end
+
+    test "inherited initializers are the same objects" do
+      assert Foo.initializers[:foo].eql?(Bar.initializers[:foo])
+    end
+
+    test "initializing with modules" do
+      Word.initializers.run
+      assert_equal "bird", $word
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/test/initializer/initialize_i18n_test.rb b/railties/test/initializer/initialize_i18n_test.rb
new file mode 100644
index 0000000000..e909688817
--- /dev/null
+++ b/railties/test/initializer/initialize_i18n_test.rb
@@ -0,0 +1,51 @@
+require "isolation/abstract_unit"
+
+module InitializerTests
+  class InitializeI18nTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app
+      boot_rails
+    end
+
+    # test_config_defaults_and_settings_should_be_added_to_i18n_defaults
+    test "i18n config defaults and settings should be added to i18n defaults" do
+      Rails::Initializer.run do |c|
+        c.i18n.load_path << "my/other/locale.yml"
+      end
+
+      #{RAILS_FRAMEWORK_ROOT}/railties/test/fixtures/plugins/engines/engine/config/locales/en.yml
+      assert_equal %W(
+        #{RAILS_FRAMEWORK_ROOT}/activesupport/lib/active_support/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/activemodel/lib/active_model/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/activerecord/lib/active_record/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/actionpack/lib/action_view/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/railties/tmp/app/config/locales/en.yml
+        my/other/locale.yml
+      ), I18n.load_path
+    end
+
+    test "i18n finds locale files in engines" do
+      app_file "vendor/plugins/engine/init.rb",               ""
+      app_file "vendor/plugins/engine/app/models/hellos.rb",  "class Hello ; end"
+      app_file "vendor/plugins/engine/lib/omg.rb",            "puts 'omg'"
+      app_file "vendor/plugins/engine/config/locales/en.yml", "hello:"
+
+      Rails::Initializer.run do |c|
+        c.i18n.load_path << "my/other/locale.yml"
+      end
+
+      #{RAILS_FRAMEWORK_ROOT}/railties/test/fixtures/plugins/engines/engine/config/locales/en.yml
+      assert_equal %W(
+        #{RAILS_FRAMEWORK_ROOT}/activesupport/lib/active_support/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/activemodel/lib/active_model/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/activerecord/lib/active_record/locale/en.yml
+        #{RAILS_FRAMEWORK_ROOT}/actionpack/lib/action_view/locale/en.yml
+        #{app_path}/config/locales/en.yml
+        my/other/locale.yml
+        #{app_path}/vendor/plugins/engine/config/locales/en.yml
+      ), I18n.load_path
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/test/initializer/path_test.rb b/railties/test/initializer/path_test.rb
index a4264bc31c..72ff8d88e0 100644
--- a/railties/test/initializer/path_test.rb
+++ b/railties/test/initializer/path_test.rb
@@ -12,7 +12,7 @@ class PathsTest < Test::Unit::TestCase
         ActionController::Base.session_store = nil
       end
     end
-    @paths = Rails::Initializer.default.config.paths
+    @paths = Rails.application.config.paths
   end
 
   def root(*path)
diff --git a/railties/test/initializer_test.rb b/railties/test/initializer_test.rb
index b67db9c835..80e774b7b7 100644
--- a/railties/test/initializer_test.rb
+++ b/railties/test/initializer_test.rb
@@ -6,490 +6,8 @@ require 'action_view'
 require 'action_mailer'
 require 'active_record'
 
-# Mocks out the configuration
-module Rails
-  def self.configuration
-    Rails::Configuration.new
-  end
-
-  module Generators
-    def self.clear_aliases!
-      @aliases = nil
-    end
-
-    def self.clear_options!
-      @@options = nil
-    end
-  end
-end
-
-
-class ConfigurationMock < Rails::Configuration
-  attr_reader :environment_path
-
-  def initialize(envpath)
-    super()
-    @environment_path = envpath
-  end
-end
-
-class Initializer_load_environment_Test < Test::Unit::TestCase
-  def test_load_environment_with_constant
-    config = ConfigurationMock.new("#{File.dirname(__FILE__)}/fixtures/environment_with_constant.rb")
-    assert_nil $initialize_test_set_from_env
-    Rails::Initializer.run(:load_environment, config)
-    assert_equal "success", $initialize_test_set_from_env
-  ensure
-    $initialize_test_set_from_env = nil
-  end
-end
-
-class Initializer_eager_loading_Test < Test::Unit::TestCase
-  def setup
-    @config = ConfigurationMock.new("")
-    @config.cache_classes = true
-    @config.load_paths = [File.expand_path(File.dirname(__FILE__) + "/fixtures/eager")]
-    @config.eager_load_paths = [File.expand_path(File.dirname(__FILE__) + "/fixtures/eager")]
-    @initializer = Rails::Initializer.default
-    @initializer.config = @config
-    @initializer.run(:set_load_path)
-    @initializer.run(:set_autoload_paths)
-  end
-
-  def test_eager_loading_loads_parent_classes_before_children
-    assert_nothing_raised do
-      @initializer.run(:load_application_classes)
-    end
-  end
-end
-
-class Initializer_after_initialize_with_blocks_environment_Test < Test::Unit::TestCase
-  def setup
-    config = ConfigurationMock.new("")
-    config.after_initialize do
-      $test_after_initialize_block1 = "success"
-    end
-    config.after_initialize do
-      $test_after_initialize_block2 = "congratulations"
-    end
-    assert_nil $test_after_initialize_block1
-    assert_nil $test_after_initialize_block2
-
-    config.expects(:gems_dependencies_loaded).returns(true)
-    Rails::Initializer.run(:after_initialize, config)
-  end
-
-  def teardown
-    $test_after_initialize_block1 = nil
-    $test_after_initialize_block2 = nil
-  end
-
-  def test_should_have_called_the_first_after_initialize_block
-    assert_equal "success", $test_after_initialize_block1
-  end
-
-  def test_should_have_called_the_second_after_initialize_block
-    assert_equal "congratulations", $test_after_initialize_block2
-  end
-end
-
-class Initializer_after_initialize_with_no_block_environment_Test < Test::Unit::TestCase
-  def setup
-    config = ConfigurationMock.new("")
-    config.after_initialize do
-      $test_after_initialize_block1 = "success"
-    end
-    config.after_initialize # don't pass a block, this is what we're testing!
-    config.after_initialize do
-      $test_after_initialize_block2 = "congratulations"
-    end
-    assert_nil $test_after_initialize_block1
-
-    config.expects(:gems_dependencies_loaded).returns(true)
-    Rails::Initializer.run(:after_initialize, config)
-  end
-
-  def teardown
-    $test_after_initialize_block1 = nil
-    $test_after_initialize_block2 = nil
-  end
-
-  def test_should_have_called_the_first_after_initialize_block
-    assert_equal "success", $test_after_initialize_block1, "should still get set"
-  end
-
-  def test_should_have_called_the_second_after_initialize_block
-    assert_equal "congratulations", $test_after_initialize_block2
-  end
-end
-
-class ConfigurationFrameworkPathsTests < Test::Unit::TestCase
-  def setup
-    @config = Rails::Configuration.new
-    @config.frameworks.clear
-    @initializer = Rails::Initializer.default
-    @initializer.config = @config
-
-    File.stubs(:directory?).returns(true)
-    Rails::Initializer.run(:set_root_path, @config)
-  end
-
-  def test_minimal
-    expected = %w(railties railties/lib activesupport/lib)
-    assert_equal expected.map {|e| "#{@config.framework_root_path}/#{e}"}, @config.framework_paths
-  end
-
-  def test_actioncontroller_or_actionview_add_actionpack
-    @config.frameworks << :action_controller
-    assert_framework_path "actionpack/lib"
-
-    @config.frameworks = [:action_view]
-    assert_framework_path 'actionpack/lib'
-  end
-
-  def test_paths_for_ar_ares_and_mailer
-    [:active_record, :action_mailer, :active_resource, :action_web_service].each do |framework|
-      @config.frameworks = [framework]
-      assert_framework_path "#{framework.to_s.gsub('_', '')}/lib"
-    end
-  end
-
-  def test_unknown_framework_raises_error
-    @config.frameworks << :action_foo
-
-    Class.any_instance.expects(:require).raises(LoadError)
-
-    assert_raise RuntimeError do
-      @initializer.run(:require_frameworks)
-    end
-  end
-
-  def test_action_mailer_load_paths_set_only_if_action_mailer_in_use
-    @config.frameworks = [:action_controller]
-    @initializer.config = @config
-    @initializer.run :require_frameworks
-
-    assert_nothing_raised NameError do
-      @initializer.run :load_view_paths
-    end
-  end
-
-  def test_action_controller_load_paths_set_only_if_action_controller_in_use
-    @config.frameworks = []
-    @initializer.run :require_frameworks
-
-    assert_nothing_raised NameError do
-      @initializer.run :load_view_paths
-    end
-  end
-
-  protected
-    def assert_framework_path(path)
-      assert @config.framework_paths.include?("#{@config.framework_root_path}/#{path}"),
-        "<#{path.inspect}> not found among <#{@config.framework_paths.inspect}>"
-    end
-end
-
 require 'plugin_test_helper'
 
-class InitializerPluginLoadingTests < Test::Unit::TestCase
-  def setup
-    @configuration     = Rails::Configuration.new
-    @configuration.frameworks -= [:action_mailer]
-    @configuration.plugin_paths << plugin_fixture_root_path
-    @initializer       = Rails::Initializer.default
-    @initializer.config = @configuration
-    @valid_plugin_path = plugin_fixture_path('default/stubby')
-    @empty_plugin_path = plugin_fixture_path('default/empty')
-  end
-
-  def test_no_plugins_are_loaded_if_the_configuration_has_an_empty_plugin_list
-    only_load_the_following_plugins! []
-    @initializer.run :load_plugins
-    assert_equal [], @configuration.loaded_plugins
-  end
-
-  def test_only_the_specified_plugins_are_located_in_the_order_listed
-    plugin_names = [:plugin_with_no_lib_dir, :acts_as_chunky_bacon]
-    only_load_the_following_plugins! plugin_names
-    load_plugins!
-    assert_plugins plugin_names, @configuration.loaded_plugins
-  end
-
-  def test_all_plugins_are_loaded_when_registered_plugin_list_is_untouched
-    failure_tip = "It's likely someone has added a new plugin fixture without updating this list"
-    load_plugins!
-    assert_plugins [:a, :acts_as_chunky_bacon, :engine, :gemlike, :plugin_with_no_lib_dir, :stubby], @configuration.loaded_plugins, failure_tip
-  end
-
-  def test_all_plugins_loaded_when_all_is_used
-    plugin_names = [:stubby, :acts_as_chunky_bacon, :all]
-    only_load_the_following_plugins! plugin_names
-    load_plugins!
-    failure_tip = "It's likely someone has added a new plugin fixture without updating this list"
-    assert_plugins [:stubby, :acts_as_chunky_bacon, :a, :engine, :gemlike, :plugin_with_no_lib_dir], @configuration.loaded_plugins, failure_tip
-  end
-
-  def test_all_plugins_loaded_after_all
-    plugin_names = [:stubby, :all, :acts_as_chunky_bacon]
-    only_load_the_following_plugins! plugin_names
-    load_plugins!
-    failure_tip = "It's likely someone has added a new plugin fixture without updating this list"
-    assert_plugins [:stubby, :a, :engine, :gemlike, :plugin_with_no_lib_dir, :acts_as_chunky_bacon], @configuration.loaded_plugins, failure_tip
-  end
-
-  def test_plugin_names_may_be_strings
-    plugin_names = ['stubby', 'acts_as_chunky_bacon', :a, :plugin_with_no_lib_dir]
-    only_load_the_following_plugins! plugin_names
-    load_plugins!
-    failure_tip = "It's likely someone has added a new plugin fixture without updating this list"
-    assert_plugins plugin_names, @configuration.loaded_plugins, failure_tip
-  end
-
-  def test_registering_a_plugin_name_that_does_not_exist_raises_a_load_error
-    only_load_the_following_plugins! [:stubby, :acts_as_a_non_existant_plugin]
-    assert_raise(LoadError) do
-      load_plugins!
-    end
-  end
-
-  def test_load_error_messages_mention_missing_plugins_and_no_others
-    valid_plugin_names = [:stubby, :acts_as_chunky_bacon]
-    invalid_plugin_names = [:non_existant_plugin1, :non_existant_plugin2]
-    only_load_the_following_plugins!( valid_plugin_names + invalid_plugin_names )
-    begin
-      load_plugins!
-      flunk "Expected a LoadError but did not get one"
-    rescue LoadError => e
-      failure_tip = "It's likely someone renamed or deleted plugin fixtures without updating this test"
-      assert_plugins valid_plugin_names, @configuration.loaded_plugins, failure_tip
-      invalid_plugin_names.each do |plugin|
-        assert_match(/#{plugin.to_s}/, e.message, "LoadError message should mention plugin '#{plugin}'")
-      end
-      valid_plugin_names.each do |plugin|
-        assert_no_match(/#{plugin.to_s}/, e.message, "LoadError message should not mention '#{plugin}'")
-      end
-
-    end
-  end
-
-  def test_should_ensure_all_loaded_plugins_load_paths_are_added_to_the_load_path
-    only_load_the_following_plugins! [:stubby, :acts_as_chunky_bacon]
-
-    @initializer.run(:add_plugin_load_paths)
-
-    assert $LOAD_PATH.include?(File.join(plugin_fixture_path('default/stubby'), 'lib'))
-    assert $LOAD_PATH.include?(File.join(plugin_fixture_path('default/acts/acts_as_chunky_bacon'), 'lib'))
-  end
-
-  private
-
-    def load_plugins!
-      @initializer.run(:add_plugin_load_paths)
-      @initializer.run(:load_plugins)
-    end
-end
-
-class InitializerGeneratorsTests < Test::Unit::TestCase
-
-  def setup
-    @configuration = Rails::Configuration.new
-    @initializer   = Rails::Initializer.default
-    @initializer.config = @configuration
-  end
-
-  def test_generators_default_values
-    assert_equal(true, @configuration.generators.colorize_logging)
-    assert_equal({}, @configuration.generators.aliases)
-    assert_equal({}, @configuration.generators.options)
-  end
-
-  def test_generators_set_rails_options
-    @configuration.generators.orm = :datamapper
-    @configuration.generators.test_framework = :rspec
-    expected = { :rails => { :orm => :datamapper, :test_framework => :rspec } }
-    assert_equal expected, @configuration.generators.options
-  end
-
-  def test_generators_set_rails_aliases
-    @configuration.generators.aliases = { :rails => { :test_framework => "-w" } }
-    expected = { :rails => { :test_framework => "-w" } }
-    assert_equal expected, @configuration.generators.aliases
-  end
-
-  def test_generators_aliases_and_options_on_initialization
-    @configuration.generators.rails :aliases => { :test_framework => "-w" }
-    @configuration.generators.orm :datamapper
-    @configuration.generators.test_framework :rspec
-
-    @initializer.run(:initialize_generators)
-
-    assert_equal :rspec, Rails::Generators.options[:rails][:test_framework]
-    assert_equal "-w", Rails::Generators.aliases[:rails][:test_framework]
-  end
-
-  def test_generators_no_color_on_initialization
-    @configuration.generators.colorize_logging = false
-    @initializer.run(:initialize_generators)
-    assert_equal Thor::Base.shell, Thor::Shell::Basic
-  end
-
-  def test_generators_with_hashes_for_options_and_aliases
-    @configuration.generators do |g|
-      g.orm    :datamapper, :migration => false
-      g.plugin :aliases => { :generator => "-g" },
-               :generator => true
-    end
-
-    expected = {
-      :rails => { :orm => :datamapper },
-      :plugin => { :generator => true },
-      :datamapper => { :migration => false }
-    }
-
-    assert_equal expected, @configuration.generators.options
-    assert_equal({ :plugin => { :generator => "-g" } }, @configuration.generators.aliases)
-  end
-
-  def test_generators_with_hashes_are_deep_merged
-    @configuration.generators do |g|
-      g.orm    :datamapper, :migration => false
-      g.plugin :aliases => { :generator => "-g" },
-               :generator => true
-    end
-    @initializer.run(:initialize_generators)
-
-    assert Rails::Generators.aliases.size >= 1
-    assert Rails::Generators.options.size >= 1
-  end
-
-  protected
-
-    def teardown
-      Rails::Generators.clear_aliases!
-      Rails::Generators.clear_options!
-    end
-end
-
-class InitializerSetupI18nTests < Test::Unit::TestCase
-  def test_no_config_locales_dir_present_should_return_empty_load_path
-    File.stubs(:exist?).returns(false)
-    assert_equal [], Rails::Configuration.new.i18n.load_path
-  end
-
-  def test_config_locales_dir_present_should_be_added_to_load_path
-    File.stubs(:exist?).returns(true)
-    Dir.stubs(:[]).returns([ "my/test/locale.yml" ])
-    assert_equal [ "my/test/locale.yml" ], Rails::Configuration.new.i18n.load_path
-  end
-
-  def test_config_defaults_should_be_added_with_config_settings
-    File.stubs(:exist?).returns(true)
-    Dir.stubs(:[]).returns([ "my/test/locale.yml" ])
-
-    config = Rails::Configuration.new
-    config.i18n.load_path << "my/other/locale.yml"
-
-    assert_equal [ "my/test/locale.yml", "my/other/locale.yml" ], config.i18n.load_path
-  end
-
-  def test_config_defaults_and_settings_should_be_added_to_i18n_defaults
-    File.stubs(:exist?).returns(true)
-    Dir.stubs(:[]).returns([ "my/test/locale.yml" ])
-
-    config = Rails::Configuration.new
-    config.i18n.load_path << "my/other/locale.yml"
-
-    Rails::Initializer.run(:initialize_i18n, config)
-    assert_equal [
-     File.expand_path(File.dirname(__FILE__) + "/../../activesupport/lib/active_support/locale/en.yml"),
-     File.expand_path(File.dirname(__FILE__) + "/../../actionpack/lib/action_view/locale/en.yml"),
-     File.expand_path(File.dirname(__FILE__) + "/../../activemodel/lib/active_model/locale/en.yml"),
-     File.expand_path(File.dirname(__FILE__) + "/../../activerecord/lib/active_record/locale/en.yml"),
-     File.expand_path(File.dirname(__FILE__) + "/../../railties/test/fixtures/plugins/engines/engine/config/locales/en.yml"),
-     "my/test/locale.yml",
-     "my/other/locale.yml" ], I18n.load_path.collect { |path| path =~ /\.\./ ? File.expand_path(path) : path }
-  end
-
-  def test_setting_another_default_locale
-    config = Rails::Configuration.new
-    config.i18n.default_locale = :de
-    Rails::Initializer.run(:initialize_i18n, config)
-    assert_equal :de, I18n.default_locale
-  end
-end
-
-class InitializerDatabaseMiddlewareTest < Test::Unit::TestCase
-  def setup
-    @config = Rails::Configuration.new
-    @config.frameworks = [:active_record, :action_controller, :action_view]
-  end
-
-  def test_initialize_database_middleware_doesnt_perform_anything_when_active_record_not_in_frameworks
-    @config.frameworks.clear
-    @config.expects(:middleware).never
-    Rails::Initializer.run(:initialize_database_middleware, @config)
-  end
-
-  def test_database_middleware_initializes_when_session_store_is_active_record
-    store = ActionController::Base.session_store
-    ActionController::Base.session_store = ActiveRecord::SessionStore
-
-    @config.middleware.expects(:insert_before).with(:"ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement)
-    @config.middleware.expects(:insert_before).with(:"ActiveRecord::SessionStore", ActiveRecord::QueryCache)
-
-    Rails::Initializer.run(:initialize_database_middleware, @config)
-  ensure
-    ActionController::Base.session_store = store
-  end
-
-  def test_database_middleware_doesnt_initialize_when_session_store_is_not_active_record
-    store = ActionController::Base.session_store
-    ActionController::Base.session_store = ActionDispatch::Session::CookieStore
-
-    # Define the class, so we don't have to actually make it load
-    eval("class ActiveRecord::ConnectionAdapters::ConnectionManagement; end")
-
-    @config.middleware.expects(:use).with(ActiveRecord::ConnectionAdapters::ConnectionManagement)
-    @config.middleware.expects(:use).with(ActiveRecord::QueryCache)
-
-    Rails::Initializer.run(:initialize_database_middleware, @config)
-  ensure
-    ActionController::Base.session_store = store
-  end
-
-  def test_ensure_database_middleware_doesnt_use_action_controller_on_initializing
-    @config.frameworks -= [:action_controller]
-    store = ActionController::Base.session_store
-    ActionController::Base.session_store = ActiveRecord::SessionStore
-
-    @config.middleware.expects(:use).with(ActiveRecord::ConnectionAdapters::ConnectionManagement)
-    @config.middleware.expects(:use).with(ActiveRecord::QueryCache)
-
-    Rails::Initializer.run(:initialize_database_middleware, @config)
-  ensure
-    ActionController::Base.session_store = store
-    @config.frameworks += [:action_controller]
-  end
-end
-
-class InitializerViewPathsTest  < Test::Unit::TestCase
-  def setup
-    @config = Rails::Configuration.new
-    @config.frameworks = [:action_view, :action_controller, :action_mailer]
-
-    ActionController::Base.stubs(:view_paths).returns(stub)
-    ActionMailer::Base.stubs(:view_paths).returns(stub)
-  end
-
-  def test_load_view_paths_doesnt_perform_anything_when_action_view_not_in_frameworks
-    @config.frameworks -= [:action_view]
-    ActionController::Base.view_paths.expects(:load!).never
-    ActionMailer::Base.view_paths.expects(:load!).never
-    Rails::Initializer.run(:load_view_paths, @config)
-  end
-end
-
 class RailsRootTest < Test::Unit::TestCase
   def test_rails_dot_root_equals_rails_root
     assert_equal RAILS_ROOT, Rails.root.to_s
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index a55ee6c01d..f83e0151a4 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -7,6 +7,8 @@
 # It is also good to know what is the bare minimum to get
 # Rails booted up.
 
+require 'fileutils'
+
 # TODO: Remove rubygems when possible
 require 'rubygems'
 require 'test/unit'
@@ -31,6 +33,10 @@ module TestHelpers
       tmp_path(*%w[app] + args)
     end
 
+    def framework_path
+      RAILS_FRAMEWORK_ROOT
+    end
+
     def rails_root
       app_path
     end
@@ -91,7 +97,8 @@ module TestHelpers
     end
 
     def app_file(path, contents)
-      File.open(app_path(path), 'w') do |f|
+      FileUtils.mkdir_p File.dirname("#{app_path}/#{path}")
+      File.open("#{app_path}/#{path}", 'w') do |f|
         f.puts contents
       end
     end
diff --git a/railties/test/new_initializer_test.rb b/railties/test/new_initializer_test.rb
deleted file mode 100644
index 67b66fb088..0000000000
--- a/railties/test/new_initializer_test.rb
+++ /dev/null
@@ -1,165 +0,0 @@
-require 'abstract_unit'
-require 'active_support/ruby/shim'
-require 'rails/initializer'
-
-class InitializerRunnerTest < ActiveSupport::TestCase
-
-  def setup
-    @runner = Rails::Initializer::Runner.new
-  end
-
-  test "A new runner can be created" do
-    assert @runner
-  end
-
-  test "The initializers actually get run when the runner is run" do
-    state = nil
-
-    @runner.add :foo do
-      run { state = true }
-    end
-
-    @runner.run
-    assert state
-  end
-
-  test "By default, initializers get run in the order that they are added" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    @runner.run
-    assert_equal [:first, :second], state
-  end
-
-  test "Raises an exception if :before or :after are specified, but don't exist" do
-    assert_raise(Rails::Initializer::Error) do
-      @runner.add(:fail, :before => :whale) { 1 }
-    end
-
-    assert_raise(Rails::Initializer::Error) do
-      @runner.add(:fail, :after => :whale) { 1 }
-    end
-  end
-
-  test "When adding an initializer, specifying :after allows you to move an initializer after another" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    @runner.add :third, :after => :first do
-      run { state << :third }
-    end
-
-    @runner.run
-    assert_equal [:first, :third, :second], state
-  end
-
-  test "An initializer can be deleted" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    @runner.delete(:second)
-
-    @runner.run
-    assert_equal [:first], state
-  end
-
-  test "A runner can be initialized with an existing runner, which it copies" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    Rails::Initializer::Runner.new(@runner).run
-    assert_equal [:first, :second], state
-  end
-
-  test "A child runner can be still be modified without modifying the parent" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    new_runner = Rails::Initializer::Runner.new(@runner)
-    new_runner.add :trois do
-      run { state << :trois }
-    end
-    new_runner.delete(:second)
-
-    new_runner.run
-    assert_equal [:first, :trois], state
-    state.clear
-    @runner.run
-    assert_equal [:first, :second], state
-  end
-
-  test "A child runner that is modified does not modify any other children of the same parent" do
-    state = []
-
-    @runner.add :first do
-      run { state << :first }
-    end
-
-    @runner.add :second do
-      run { state << :second }
-    end
-
-    child_one = Rails::Initializer::Runner.new(@runner)
-    child_two = Rails::Initializer::Runner.new(@runner)
-
-    child_one.delete(:second)
-    child_two.run
-
-    assert_equal [:first, :second], state
-  end
-
-  test "It does not run the initializer block immediately" do
-    state = []
-    @runner.add :first do
-      state << :first
-    end
-
-    assert_equal [], state
-  end
-
-  test "It runs the block when the runner is run" do
-    state = []
-    @runner.add :first do
-      state << :first
-    end
-
-    @runner.run
-    assert_equal [:first], state
-  end
-
-end
\ No newline at end of file
diff --git a/railties/test/plugin_loader_test.rb b/railties/test/plugin_loader_test.rb
index 99301347b6..0b43c49bb2 100644
--- a/railties/test/plugin_loader_test.rb
+++ b/railties/test/plugin_loader_test.rb
@@ -5,10 +5,13 @@ $:.unshift File.dirname(__FILE__) + "/../../actionmailer/lib"
 require 'action_controller'
 require 'action_mailer'
 
-# Mocks out the configuration
-module Rails
-  def self.configuration
-    Rails::Configuration.new
+# TODO: Rewrite all these tests
+class FakeInitializerSlashApplication
+  attr_reader :config
+  alias configuration config
+
+  def initialize
+    @config = Rails::Configuration.new
   end
 end
 
@@ -18,10 +21,10 @@ class TestPluginLoader < Test::Unit::TestCase
   def setup
     reset_load_path!
 
-    @configuration     = Rails::Configuration.new
+    @initializer      = FakeInitializerSlashApplication.new
+    @configuration    = @initializer.config
+    Rails.application = @initializer
     @configuration.plugin_paths << plugin_fixture_root_path
-    @initializer       = Rails::Initializer.default
-    @initializer.config = @configuration
     @valid_plugin_path = plugin_fixture_path('default/stubby')
     @empty_plugin_path = plugin_fixture_path('default/empty')
 
diff --git a/railties/test/plugin_locator_test.rb b/railties/test/plugin_locator_test.rb
index da1548dee1..ef57e7ed4c 100644
--- a/railties/test/plugin_locator_test.rb
+++ b/railties/test/plugin_locator_test.rb
@@ -1,5 +1,15 @@
 require 'plugin_test_helper'
 
+# TODO: Rewrite all these tests
+class FakeInitializerSlashApplication
+  attr_reader :config
+  alias configuration config
+
+  def initialize
+    @config = Rails::Configuration.new
+  end
+end
+
 class PluginLocatorTest < Test::Unit::TestCase
   def test_should_require_subclasses_to_implement_the_plugins_method
     assert_raise(RuntimeError) do
@@ -23,12 +33,12 @@ end
 
 class PluginFileSystemLocatorTest < Test::Unit::TestCase
   def setup
-    @configuration = Rails::Configuration.new
+    @initializer      = FakeInitializerSlashApplication.new
+    @configuration    = @initializer.config
+    Rails.application = @initializer
     # We need to add our testing plugin directory to the plugin paths so
     # the locator knows where to look for our plugins
     @configuration.plugin_paths << plugin_fixture_root_path
-    @initializer       = Rails::Initializer.default
-    @initializer.config = @configuration
     @locator           = Rails::Plugin::FileSystemLocator.new(@initializer)
     @valid_plugin_path = plugin_fixture_path('default/stubby')
     @empty_plugin_path = plugin_fixture_path('default/empty')
diff --git a/railties/test/plugin_test.rb b/railties/test/plugin_test.rb
index ae03ea4662..199adcfe39 100644
--- a/railties/test/plugin_test.rb
+++ b/railties/test/plugin_test.rb
@@ -1,9 +1,20 @@
 require 'plugin_test_helper'
 
+# TODO: Rewrite all these tests
+class FakeInitializerSlashApplication
+  attr_reader :config
+  alias configuration config
+
+  def initialize
+    @config = Rails::Configuration.new
+  end
+end
+
 class PluginTest < Test::Unit::TestCase
   def setup
-    @initializer         = Rails::Initializer.default
-    @initializer.config  = Rails::Configuration.new
+    @initializer      = FakeInitializerSlashApplication.new
+    @configuration    = @initializer.config
+    Rails.application = @initializer
     @valid_plugin_path   = plugin_fixture_path('default/stubby')
     @empty_plugin_path   = plugin_fixture_path('default/empty')
     @gemlike_plugin_path = plugin_fixture_path('default/gemlike')