Memoize in the endpoint.

.gitignore

@@ -30,5 +30,5 @@ railties/guides/output
 actionpack/bin
 */vendor/gems/gems
 */vendor/gems/specifications
-*/vendor/gems/environment.rb
+actionpack/vendor/gems/environment.rb
 */vendor/gems/dirs/specifications
\ No newline at end of file

actionpack/lib/action_controller/metal.rb

@@ -79,6 +79,15 @@ def to_a
     end
 
     class ActionEndpoint
+      @@endpoints = Hash.new {|h,k| h[k] = Hash.new {|h,k| h[k] = {} } }
+
+      def self.for(controller, action, stack)
+        @@endpoints[controller][action][stack] ||= begin
+          endpoint = new(controller, action)
+          stack.build(endpoint)
+        end
+      end
+
       def initialize(controller, action)
         @controller, @action = controller, action
       end
@@ -108,11 +117,7 @@ def self.middleware
     # ==== Returns
     # Proc:: A rack application
     def self.action(name)
-      @actions ||= {}
-      @actions[name.to_s] ||= begin
-        endpoint = ActionEndpoint.new(self, name)
-        middleware_stack.build(endpoint)
-      end
+      ActionEndpoint.for(self, name, middleware_stack)
     end
   end
 end

actionpack/vendor/gems/environment.rb

-# DO NOT MODIFY THIS FILE
-module Bundler
-  dir = File.dirname(__FILE__)
-
-  ENV["PATH"]     = "#{dir}/../../bin:#{ENV["PATH"]}"
-  ENV["RUBYOPT"]  = "-r#{__FILE__} #{ENV["RUBYOPT"]}"
-
-  $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/gems/activemodel-3.0.pre/bin")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/../../../activemodel/lib")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/gems/activesupport-3.0.pre/bin")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/../../../activesupport/lib")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-1.0.0/bin")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-1.0.0/lib")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-test-0.4.2/bin")
-  $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-test-0.4.2/lib")
-
-  @gemfile = "#{dir}/../../Gemfile"
-
-  require "rubygems"
-
-  @bundled_specs = {}
-  @bundled_specs["rack"] = eval(File.read("#{dir}/specifications/rack-1.0.0.gemspec"))
-  @bundled_specs["rack"].loaded_from = "#{dir}/specifications/rack-1.0.0.gemspec"
-  @bundled_specs["activemodel"] = eval(File.read("#{dir}/dirs/specifications/activemodel-3.0.pre.gemspec"))
-  @bundled_specs["activemodel"].loaded_from = "#{dir}/dirs/specifications/activemodel-3.0.pre.gemspec"
-  @bundled_specs["rack-test"] = eval(File.read("#{dir}/specifications/rack-test-0.4.2.gemspec"))
-  @bundled_specs["rack-test"].loaded_from = "#{dir}/specifications/rack-test-0.4.2.gemspec"
-  @bundled_specs["activesupport"] = eval(File.read("#{dir}/dirs/specifications/activesupport-3.0.pre.gemspec"))
-  @bundled_specs["activesupport"].loaded_from = "#{dir}/dirs/specifications/activesupport-3.0.pre.gemspec"
-
-  def self.add_specs_to_loaded_specs
-    Gem.loaded_specs.merge! @bundled_specs
-  end
-
-  def self.add_specs_to_index
-    @bundled_specs.each do |name, spec|
-      Gem.source_index.add_spec spec
-    end
-  end
-
-  add_specs_to_loaded_specs
-  add_specs_to_index
-
-  def self.require_env(env = nil)
-    context = Class.new do
-      def initialize(env) @env = env && env.to_s ; end
-      def method_missing(*) ; end
-      def only(env)
-        old, @only = @only, _combine_onlys(env)
-        yield
-        @only = old
-      end
-      def except(env)
-        old, @except = @except, _combine_excepts(env)
-        yield
-        @except = old
-      end
-      def gem(name, *args)
-        opt = args.last || {}
-        only = _combine_onlys(opt[:only] || opt["only"])
-        except = _combine_excepts(opt[:except] || opt["except"])
-        files = opt[:require_as] || opt["require_as"] || name
-
-        return unless !only || only.any? {|e| e == @env }
-        return if except && except.any? {|e| e == @env }
-
-        files.each { |f| require f }
-        yield if block_given?
-        true
-      end
-      private
-      def _combine_onlys(only)
-        return @only unless only
-        only = [only].flatten.compact.uniq.map { |o| o.to_s }
-        only &= @only if @only
-        only
-      end
-      def _combine_excepts(except)
-        return @except unless except
-        except = [except].flatten.compact.uniq.map { |o| o.to_s }
-        except |= @except if @except
-        except
-      end
-    end
-    context.new(env && env.to_s).instance_eval(File.read(@gemfile))
-  end
-end
-
-module Gem
-  def source_index.refresh!
-    super
-    Bundler.add_specs_to_index
-  end
-end