1 files changed, 89 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/caching.rb b/actionpack/lib/action_controller/caching.rb
new file mode 100644
index 0000000000..12d798d0c1
--- /dev/null
+++ b/actionpack/lib/action_controller/caching.rb
@@ -0,0 +1,89 @@
+require 'fileutils'
+require 'uri'
+require 'set'
+
+module ActionController
+  # \Caching is a cheap way of speeding up slow applications by keeping the result of
+  # calculations, renderings, and database calls around for subsequent requests.
+  #
+  # You can read more about each approach by clicking the modules below.
+  #
+  # Note: To turn off all caching, set
+  #   config.action_controller.perform_caching = false
+  #
+  # == \Caching stores
+  #
+  # All the caching stores from ActiveSupport::Cache are available to be used as backends
+  # for Action Controller caching.
+  #
+  # Configuration examples (MemoryStore is the default):
+  #
+  #   config.action_controller.cache_store = :memory_store
+  #   config.action_controller.cache_store = :file_store, '/path/to/cache/directory'
+  #   config.action_controller.cache_store = :mem_cache_store, 'localhost'
+  #   config.action_controller.cache_store = :mem_cache_store, Memcached::Rails.new('localhost:11211')
+  #   config.action_controller.cache_store = MyOwnStore.new('parameter')
+  module Caching
+    extend ActiveSupport::Concern
+    extend ActiveSupport::Autoload
+
+    eager_autoload do
+      autoload :Fragments
+    end
+
+    module ConfigMethods
+      def cache_store
+        config.cache_store
+      end
+
+      def cache_store=(store)
+        config.cache_store = ActiveSupport::Cache.lookup_store(store)
+      end
+
+      private
+        def cache_configured?
+          perform_caching && cache_store
+        end
+    end
+
+    include RackDelegation
+    include AbstractController::Callbacks
+
+    include ConfigMethods
+    include Fragments
+
+    included do
+      extend ConfigMethods
+
+      config_accessor :default_static_extension
+      self.default_static_extension ||= '.html'
+
+      config_accessor :perform_caching
+      self.perform_caching = true if perform_caching.nil?
+
+      class_attribute :_view_cache_dependencies
+      self._view_cache_dependencies = []
+      helper_method :view_cache_dependencies if respond_to?(:helper_method)
+    end
+
+    module ClassMethods
+      def view_cache_dependency(&dependency)
+        self._view_cache_dependencies += [dependency]
+      end
+    end
+
+    def view_cache_dependencies
+      self.class._view_cache_dependencies.map { |dep| instance_exec(&dep) }.compact
+    end
+
+    protected
+      # Convenience accessor.
+      def cache(key, options = {}, &block)
+        if cache_configured?
+          cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
+        else
+          yield
+        end
+      end
+  end
+end