Add support for callbacks

actionpack/lib/action_controller/abstract/base.rb

@@ -15,10 +15,14 @@ def initialize
 
     def process(action_name)
       @_action_name = action_name
-      send(action_name)
+      process_action
       self.response_obj[:body] = self.response_body
       self
     end
 
+    def process_action
+      send(action_name)
+    end
+
   end
 end

actionpack/lib/action_controller/abstract/callbacks.rb

@@ -1,5 +1,43 @@
 module AbstractController
   module Callbacks
+    def self.included(klass)
+      klass.class_eval do
+        include ActiveSupport::NewCallbacks
+        define_callbacks :process_action
+        extend ClassMethods
+      end
+    end
 
+    def process_action
+      _run_process_action_callbacks(action_name) do
+        super
+      end
+    end
+
+    module ClassMethods
+      def _normalize_callback_options(options)
+        if only = options[:only]
+          only = Array(only).map {|o| "action_name == :#{o}"}.join(" && ")
+          options[:per_key] = {:if => only}
+        end
+        if except = options[:except]
+          except = Array(except).map {|e| "action_name == :#{e}"}.join(" && ")          
+          options[:per_key] = {:unless => except}
+        end
+      end
+
+      [:before, :after, :around].each do |filter|
+        class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+          def #{filter}_filter(*names, &blk)
+            options = names.last.is_a?(Hash) ? names.pop : {}
+            _normalize_callback_options(options)
+            names.push(blk) if block_given?
+            names.each do |name|
+              process_action_callback(:#{filter}, name, options)
+            end
+          end
+        RUBY_EVAL
+      end
+    end
   end
 end

activesupport/lib/active_support.rb

@@ -32,6 +32,7 @@ def self.load_all!
   autoload :BufferedLogger, 'active_support/buffered_logger'
   autoload :Cache, 'active_support/cache'
   autoload :Callbacks, 'active_support/callbacks'
+  autoload :NewCallbacks, 'active_support/new_callbacks'
   autoload :ConcurrentHash, 'active_support/concurrent_hash'
   autoload :Deprecation, 'active_support/deprecation'
   autoload :Duration, 'active_support/duration'