1 files changed, 33 insertions, 23 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/callbacks.rb b/actionpack/lib/action_dispatch/middleware/callbacks.rb
index 0a2b4cf5f7..56d6da1706 100644
--- a/actionpack/lib/action_dispatch/middleware/callbacks.rb
+++ b/actionpack/lib/action_dispatch/middleware/callbacks.rb
@@ -1,40 +1,50 @@
 module ActionDispatch
   class Callbacks
-    include ActiveSupport::Callbacks
-    define_callbacks :prepare, :before, :after
+    include ActiveSupport::NewCallbacks
+
+    define_callbacks :call, :terminator => "result == false", :rescuable => true
+    define_callbacks :prepare, :scope => :name
+
+    # Add a preparation callback. Preparation callbacks are run before every
+    # request in development mode, and before the first request in production mode.
+    #
+    # If a symbol with a block is given, the symbol is used as an identifier.
+    # That allows to_prepare to be called again with the same identifier to
+    # replace the existing callback. Passing an identifier is a suggested
+    # practice if the code adding a preparation block may be reloaded.
+    def self.to_prepare(*args, &block)
+      if args.first.is_a?(Symbol) && block_given?
+        define_method :"__#{args.first}", &block
+        set_callback(:prepare, :"__#{args.first}")
+      else
+        set_callback(:prepare, *args, &block)
+      end
+    end
+
+    def self.before(*args, &block)
+      set_callback(:call, :before, *args, &block)
+    end
+
+    def self.after(*args, &block)
+      set_callback(:call, :after, *args, &block)
+    end
 
     class << self
       # DEPRECATED
-      alias_method :prepare_dispatch, :prepare
       alias_method :before_dispatch, :before
       alias_method :after_dispatch, :after
     end
 
-    # Add a preparation callback. Preparation callbacks are run before every
-    # request in development mode, and before the first request in production
-    # mode.
-    #
-    # An optional identifier may be supplied for the callback. If provided,
-    # to_prepare may be called again with the same identifier to replace the
-    # existing callback. Passing an identifier is a suggested practice if the
-    # code adding a preparation block may be reloaded.
-    def self.to_prepare(identifier = nil, &block)
-      @prepare_callbacks ||= ActiveSupport::Callbacks::CallbackChain.new
-      callback = ActiveSupport::Callbacks::Callback.new(:prepare, block, :identifier => identifier)
-      @prepare_callbacks.replace_or_append!(callback)
-    end
-
     def initialize(app, prepare_each_request = false)
       @app, @prepare_each_request = app, prepare_each_request
-      run_callbacks :prepare
+      _run_prepare_callbacks
     end
 
     def call(env)
-      run_callbacks :before
-      run_callbacks :prepare if @prepare_each_request
-      @app.call(env)
-    ensure
-      run_callbacks :after, :enumerator => :reverse_each
+      _run_call_callbacks do
+        _run_prepare_callbacks if @prepare_each_request
+        @app.call(env)
+      end
     end
   end
 end