3 files changed, 23 insertions, 21 deletions
diff --git a/railties/lib/rails/application/bootstrap.rb b/railties/lib/rails/application/bootstrap.rb
index e567df7162..a1bc95550b 100644
--- a/railties/lib/rails/application/bootstrap.rb
+++ b/railties/lib/rails/application/bootstrap.rb
@@ -13,11 +13,18 @@ module Rails
         require "active_support/all" unless config.active_support.bare
       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, :group => :all do
-        ActiveSupport::Autoload.eager_autoload! if config.preload_frameworks
+      initializer :set_eager_load, :group => :all do
+        if config.eager_load.nil?
+          warn <<-INFO
+config.eager_load is set to nil. Please update your config/environments/*.rb files accordingly:
+
+  * development - set it to false
+  * test - set it to false (unless you use a tool that preloads your test environment)
+  * production - set it to true
+
+INFO
+          config.eager_load = config.cache_classes
+        end
       end
 
       # Initialize the logger early in the stack in case we need to log some deprecation.
@@ -60,7 +67,6 @@ module Rails
       end
 
       # Sets the dependency loading mechanism.
-      # TODO: Remove files from the $" and always use require.
       initializer :initialize_dependency_mechanism, :group => :all do
         ActiveSupport::Dependencies.mechanism = config.cache_classes ? :require : :load
       end
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index 2b36cc9d0d..7f05b2e7e1 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -5,11 +5,11 @@ require 'rails/engine/configuration'
 module Rails
   class Application
     class Configuration < ::Rails::Engine::Configuration
-      attr_accessor :allow_concurrency, :asset_host, :asset_path, :assets, :autoflush_log,
+      attr_accessor :asset_host, :asset_path, :assets, :autoflush_log,
                     :cache_classes, :cache_store, :consider_all_requests_local, :console,
-                    :dependency_loading, :exceptions_app, :file_watcher, :filter_parameters,
+                    :eager_load, :exceptions_app, :file_watcher, :filter_parameters,
                     :force_ssl, :helpers_paths, :logger, :log_formatter, :log_tags,
-                    :preload_frameworks, :railties_order, :relative_url_root, :secret_token,
+                    :railties_order, :relative_url_root, :secret_token,
                     :serve_static_assets, :ssl_options, :static_cache_control, :session_options,
                     :time_zone, :reload_classes_only_on_change,
                     :queue, :queue_consumer
@@ -20,11 +20,9 @@ module Rails
       def initialize(*)
         super
         self.encoding = "utf-8"
-        @allow_concurrency             = false
         @consider_all_requests_local   = false
         @filter_parameters             = []
         @helpers_paths                 = []
-        @dependency_loading            = true
         @serve_static_assets           = true
         @static_cache_control          = nil
         @force_ssl                     = false
@@ -45,6 +43,7 @@ module Rails
         @log_formatter                 = ActiveSupport::Logger::SimpleFormatter.new
         @queue                         = Rails::Queueing::Queue
         @queue_consumer                = Rails::Queueing::ThreadedConsumer
+        @eager_load                    = nil
 
         @assets = ActiveSupport::OrderedOptions.new
         @assets.enabled                  = false
@@ -91,15 +90,12 @@ module Rails
         end
       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!
-        @preload_frameworks = true
+        ActiveSupport::Deprecation.warn "config.threadsafe! is deprecated. Rails applications " \
+          "behave by default as thread safe in production as long as config.cache_classes and " \
+          "config.eager_load are set to true"
         @cache_classes = true
-        @dependency_loading = false
-        @allow_concurrency = true
+        @eager_load = true
         self
       end
 
diff --git a/railties/lib/rails/application/finisher.rb b/railties/lib/rails/application/finisher.rb
index 60aa40b92f..1952a0fc3a 100644
--- a/railties/lib/rails/application/finisher.rb
+++ b/railties/lib/rails/application/finisher.rb
@@ -50,9 +50,9 @@ module Rails
       end
 
       initializer :eager_load! do
-        if config.cache_classes && !(defined?($rails_rake_task) && $rails_rake_task)
+        if config.eager_load
           ActiveSupport.run_load_hooks(:before_eager_load, self)
-          eager_load!
+          config.eager_load_namespaces.each(&:eager_load!)
         end
       end
 
@@ -91,7 +91,7 @@ module Rails
 
       # Disable dependency loading during request cycle
       initializer :disable_dependency_loading do
-        if config.cache_classes && !config.dependency_loading
+        if config.eager_load
           ActiveSupport::Dependencies.unhook!
         end
       end