Started making progress on implementing a new initializer.

	Class.any_instance.expects(:require).raises(LoadError)
	... w0t

1 files changed, 1137 insertions, 0 deletions

diff --git a/railties/lib/initializer_old.rb b/railties/lib/initializer_old.rb
new file mode 100644
index 0000000000..cee5c7bcb6
--- /dev/null
+++ b/railties/lib/initializer_old.rb
@@ -0,0 +1,1137 @@
+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
+