# 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)
          before_dispatch { ActiveRecord::Base.verify_active_connections! }
          to_prepare(:activerecord_instantiate_observers) { ActiveRecord::Base.instantiate_observers }
        end

        after_dispatch :flush_logger if defined?(RAILS_DEFAULT_LOGGER) && RAILS_DEFAULT_LOGGER.respond_to?(:flush)
      end