Reorganize autoloads:

  * A new module (ActiveSupport::Autoload) is provide that extends
    autoloading with new behavior.
  * All autoloads in modules that have extended ActiveSupport::Autoload
    will be eagerly required in threadsafe environments
  * Autoloads can optionally leave off the path if the path is the same
    as full_constant_name.underscore
  * It is possible to specify that a group of autoloads live under an
    additional path. For instance, all of ActionDispatch's middlewares
    are ActionDispatch::MiddlewareName, but they live under 
    "action_dispatch/middlewares/middleware_name"
  * It is possible to specify that a group of autoloads are all found
    at the same path. For instance, a number of exceptions might all
    be declared there.
  * One consequence of this is that testing-related constants are not
    autoloaded. To get the testing helpers for a given component,
    require "component_name/test_case". For instance, "action_controller/test_case".
  * test_help.rb, which is automatically required by a Rails application's
    test helper, requires the test_case.rb for all active components, so
    this change will not be disruptive in existing or new applications.

1 files changed, 21 insertions, 20 deletions

diff --git a/actionpack/lib/action_dispatch.rb b/actionpack/lib/action_dispatch.rb
index 259814a322..e21dbc59cc 100644
--- a/actionpack/lib/action_dispatch.rb
+++ b/actionpack/lib/action_dispatch.rb
@@ -28,37 +28,38 @@ module Rack
 end
 
 module ActionDispatch
-  autoload :Request, 'action_dispatch/http/request'
-  autoload :Response, 'action_dispatch/http/response'
-  autoload :StatusCodes, 'action_dispatch/http/status_codes'
-  autoload :Utils, 'action_dispatch/http/utils'
+  extend ActiveSupport::Autoload
 
-  autoload :Callbacks, 'action_dispatch/middleware/callbacks'
-  autoload :MiddlewareStack, 'action_dispatch/middleware/stack'
-  autoload :ParamsParser, 'action_dispatch/middleware/params_parser'
-  autoload :Rescue, 'action_dispatch/middleware/rescue'
-  autoload :ShowExceptions, 'action_dispatch/middleware/show_exceptions'
-  autoload :Static, 'action_dispatch/middleware/static'
-  autoload :StringCoercion, 'action_dispatch/middleware/string_coercion'
+  autoload_under "http" do
+    autoload :Request
+    autoload :Response
+    autoload :StatusCodes
+    autoload :Utils
+  end
 
-  autoload :Routing, 'action_dispatch/routing'
+  autoload_under "middleware" do
+    autoload :Callbacks
+    autoload :ParamsParser
+    autoload :Rescue
+    autoload :ShowExceptions
+    autoload :Static
+    autoload :StringCoercion
+  end
 
-  autoload :Assertions, 'action_dispatch/testing/assertions'
-  autoload :Integration, 'action_dispatch/testing/integration'
-  autoload :IntegrationTest, 'action_dispatch/testing/integration'
-  autoload :PerformanceTest, 'action_dispatch/testing/performance_test'
-  autoload :TestRequest, 'action_dispatch/testing/test_request'
-  autoload :TestResponse, 'action_dispatch/testing/test_response'
+  autoload :MiddlewareStack, 'action_dispatch/middleware/stack'
+  autoload :Routing
 
   autoload :HTML, 'action_controller/vendor/html-scanner'
 
   module Http
-    autoload :Headers, 'action_dispatch/http/headers'
+    extend ActiveSupport::Autoload
+
+    autoload :Headers
   end
 
   module Session
     autoload :AbstractStore, 'action_dispatch/middleware/session/abstract_store'
-    autoload :CookieStore, 'action_dispatch/middleware/session/cookie_store'
+    autoload :CookieStore,   'action_dispatch/middleware/session/cookie_store'
     autoload :MemCacheStore, 'action_dispatch/middleware/session/mem_cache_store'
   end
 end