refactor Reference to a ClassCache object, fix lazy lookup in Middleware so that anonymous classes are supported

actionpack/lib/action_dispatch/middleware/stack.rb

@@ -7,12 +7,19 @@ module ActionDispatch
       attr_reader :args, :block
 
       def initialize(klass_or_name, *args, &block)
-        @ref = ActiveSupport::Dependencies::Reference.new(klass_or_name)
+        @klass = nil
+        @name  = klass_or_name
+
+        if klass_or_name.respond_to?(:name)
+          @klass = klass_or_name
+          @name  = @klass.name
+        end
+
         @args, @block = args, block
       end
 
       def klass
-        @ref.get
+        @klass ||= ActiveSupport::Inflector.constantize(@name)
       end
 
       def ==(middleware)
@@ -22,7 +29,7 @@ module ActionDispatch
         when Class
           klass == middleware
         else
-          normalize(@ref.name) == normalize(middleware)
+          normalize(@name) == normalize(middleware)
         end
       end
 

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -50,12 +50,13 @@ module ActionDispatch
       private
 
         def controller_reference(controller_param)
+          controller_name = "#{controller_param.camelize}Controller"
+
           unless controller = @controllers[controller_param]
-            controller_name = "#{controller_param.camelize}Controller"
             controller = @controllers[controller_param] =
               ActiveSupport::Dependencies.ref(controller_name)
           end
-          controller.get
+          controller.get(controller_name)
         end
 
         def dispatch(controller, action, env)

actionpack/test/dispatch/middleware_stack/middleware_test.rb

@@ -0,0 +1,50 @@
+require 'abstract_unit'
+require 'action_dispatch/middleware/stack'
+
+module ActionDispatch
+  class MiddlewareStack
+    class MiddlewareTest < ActiveSupport::TestCase
+      class Omg; end
+
+      {
+        'concrete'  => Omg,
+        'anonymous' => Class.new
+      }.each do |name, klass|
+
+        define_method("test_#{name}_klass") do
+          mw = Middleware.new klass
+          assert_equal klass, mw.klass
+        end
+
+        define_method("test_#{name}_==") do
+          mw1 = Middleware.new klass
+          mw2 = Middleware.new klass
+          assert_equal mw1, mw2
+        end
+
+      end
+
+      def test_string_class
+        mw = Middleware.new Omg.name
+        assert_equal Omg, mw.klass
+      end
+
+      def test_double_equal_works_with_classes
+        k = Class.new
+        mw = Middleware.new k
+        assert_operator mw, :==, k
+        assert_operator mw, :!=, Class.new
+      end
+
+      def test_double_equal_works_with_strings
+        mw = Middleware.new Omg
+        assert_operator mw, :==, Omg.name
+      end
+
+      def test_double_equal_normalizes_strings
+        mw = Middleware.new Omg
+        assert_operator mw, :==, "::#{Omg.name}"
+      end
+    end
+  end
+end

activesupport/CHANGELOG

@@ -1,5 +1,11 @@
 *Rails 3.1.0 (unreleased)*
 
+* ActiveSupport::Dependencies::ClassCache class has been introduced for
+holding references to reloadable classes.
+
+* ActiveSupport::Dependencies::Reference has been refactored to take direct
+advantage of the new ClassCache.
+
 * Backports Range#cover? as an alias for Range#include? in Ruby 1.8 [Diego Carrion, fxn]
 
 * Added weeks_ago and prev_week to Date/DateTime/Time. [Rob Zolkos, fxn]

activesupport/lib/active_support/dependencies.rb

@@ -524,31 +524,52 @@ module ActiveSupport #:nodoc:
       explicitly_unloadable_constants.each { |const| remove_constant const }
     end
 
-    class Reference
-      @@constants = Hash.new { |h, k| h[k] = Inflector.constantize(k) }
-
-      attr_reader :name
-
-      def initialize(name)
-        @name = name.to_s
-        @@constants[@name] = name if name.respond_to?(:name)
+    class ClassCache
+      def initialize
+        @store = Hash.new { |h, k| h[k] = Inflector.constantize(k) }
       end
 
-      def get
-        @@constants[@name]
+      def empty?
+        @store.empty?
       end
 
-      def self.clear!
-        @@constants.clear
+      def key?(key)
+        @store.key?(key)
+      end
+
+      def []=(key, value)
+        return unless key.respond_to?(:name)
+
+        raise(ArgumentError, 'anonymous classes cannot be cached') unless key.name
+
+        @store[key.name] = value
+      end
+
+      def [](key)
+        key = key.name if key.respond_to?(:name)
+
+        @store[key]
+      end
+      alias :get :[]
+
+      def new(name)
+        self[name] = name
+        self
+      end
+
+      def clear!
+        @store.clear
       end
     end
 
+    Reference = ClassCache.new
+
     def ref(name)
       references[name] ||= Reference.new(name)
     end
 
     def constantize(name)
-      ref(name).get
+      ref(name).get(name)
     end
 
     # Determine if the given constant has been automatically loaded.

activesupport/test/class_cache_test.rb

@@ -0,0 +1,81 @@
+require 'abstract_unit'
+require 'active_support/dependencies'
+
+module ActiveSupport
+  module Dependencies
+    class ClassCacheTest < ActiveSupport::TestCase
+      def setup
+        @cache = ClassCache.new
+      end
+
+      def test_empty?
+        assert @cache.empty?
+        @cache[ClassCacheTest] = ClassCacheTest
+        assert !@cache.empty?
+      end
+
+      def test_clear!
+        assert @cache.empty?
+        @cache[ClassCacheTest] = ClassCacheTest
+        assert !@cache.empty?
+        @cache.clear!
+        assert @cache.empty?
+      end
+
+      def test_set_key
+        @cache[ClassCacheTest] = ClassCacheTest
+        assert @cache.key?(ClassCacheTest.name)
+      end
+
+      def test_set_rejects_strings
+        @cache[ClassCacheTest.name] = ClassCacheTest
+        assert @cache.empty?
+      end
+
+      def test_get_with_class
+        @cache[ClassCacheTest] = ClassCacheTest
+        assert_equal ClassCacheTest, @cache[ClassCacheTest]
+      end
+
+      def test_get_with_name
+        @cache[ClassCacheTest] = ClassCacheTest
+        assert_equal ClassCacheTest, @cache[ClassCacheTest.name]
+      end
+
+      def test_get_constantizes
+        assert @cache.empty?
+        assert_equal ClassCacheTest, @cache[ClassCacheTest.name]
+      end
+
+      def test_get_is_an_alias
+        assert_equal @cache[ClassCacheTest], @cache.get(ClassCacheTest.name)
+      end
+
+      def test_new
+        @cache.new ClassCacheTest
+        assert @cache.key?(ClassCacheTest.name)
+      end
+
+      def test_new_rejects_strings
+        @cache.new ClassCacheTest.name
+        assert !@cache.key?(ClassCacheTest.name)
+      end
+
+      def test_new_returns_self
+        v = @cache.new ClassCacheTest.name
+        assert_equal @cache, v
+      end
+
+      def test_anonymous_class_fail
+        assert_raises(ArgumentError) do
+          @cache.new Class.new
+        end
+
+        assert_raises(ArgumentError) do
+          x = Class.new
+          @cache[x] = x
+        end
+      end
+    end
+  end
+end

activesupport/test/dependencies_test.rb

@@ -479,13 +479,13 @@ class DependenciesTest < Test::Unit::TestCase
     with_loading 'dependencies' do
       c = ActiveSupport::Dependencies.ref("ServiceOne")
       service_one_first = ServiceOne
-      assert_equal service_one_first, c.get
+      assert_equal service_one_first, c.get("ServiceOne")
       ActiveSupport::Dependencies.clear
       assert ! defined?(ServiceOne)
 
       service_one_second = ServiceOne
-      assert_not_equal service_one_first, c.get
-      assert_equal service_one_second, c.get
+      assert_not_equal service_one_first, c.get("ServiceOne")
+      assert_equal service_one_second, c.get("ServiceOne")
     end
   end