    # File lib/action_controller/dispatcher.rb, line 8
          def define_dispatcher_callbacks(cache_classes)
            unless cache_classes
              # Development mode callbacks
              before_dispatch :reload_application
              after_dispatch :cleanup_application
            end

            # Common callbacks
            to_prepare :load_application_controller do
              begin
                require_dependency 'application' unless defined?(::ApplicationController)
              rescue LoadError => error
                raise unless error.message =~ /application\.rb/
              end
            end

            if defined?(ActiveRecord)
              after_dispatch :checkin_connections
              to_prepare(:activerecord_instantiate_observers) { ActiveRecord::Base.instantiate_observers }
            end

            after_dispatch :flush_logger if Base.logger && Base.logger.respond_to?(:flush)

            to_prepare do
              I18n.reload!
            end
          end