1 files changed, 58 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/railtie.rb b/actionpack/lib/action_dispatch/railtie.rb
new file mode 100644
index 0000000000..9fd034cdd2
--- /dev/null
+++ b/actionpack/lib/action_dispatch/railtie.rb
@@ -0,0 +1,58 @@
+require "action_dispatch"
+require "rails"
+
+module ActionDispatch
+  class Railtie < Rails::Railtie
+    plugin_name :action_dispatch
+
+    require "action_dispatch/railties/subscriber"
+    subscriber ActionDispatch::Railties::Subscriber.new
+
+    class MetalMiddlewareBuilder
+      def initialize(metals)
+        @metals = metals
+      end
+
+      def new(app)
+        ActionDispatch::Cascade.new(@metals, app)
+      end
+
+      def name
+        ActionDispatch::Cascade.name
+      end
+      alias_method :to_s, :name
+    end
+
+    initializer "action_dispatch.initialize_metal" do |app|
+      metal_root = "#{Rails.root}/app/metal"
+      load_list = app.config.metals || Dir["#{metal_root}/**/*.rb"]
+
+      metals = load_list.map { |metal|
+        metal = File.basename(metal.gsub("#{metal_root}/", ''), '.rb')
+        require_dependency metal
+        metal.camelize.constantize
+      }.compact
+
+      middleware = MetalMiddlewareBuilder.new(metals)
+      app.config.middleware.insert_before(:"ActionDispatch::ParamsParser", middleware)
+    end
+
+    # Prepare dispatcher callbacks and run 'prepare' callbacks
+    initializer "action_dispatch.prepare_dispatcher" do |app|
+      # TODO: This used to say unless defined?(Dispatcher). Find out why and fix.
+      require 'rails/dispatcher'
+
+      unless app.config.cache_classes
+        # Setup dev mode route reloading
+        routes_last_modified = app.routes_changed_at
+        reload_routes = lambda do
+          unless app.routes_changed_at == routes_last_modified
+            routes_last_modified = app.routes_changed_at
+            app.reload_routes!
+          end
+        end
+        ActionDispatch::Callbacks.before { |callbacks| reload_routes.call }
+      end
+    end
+  end
+end
+\ No newline at end of file