    # File lib/action_controller/dispatcher.rb, line 8
          def define_dispatcher_callbacks(cache_classes)
            @@cache_classes = cache_classes
            unless cache_classes
              ActionView::Helpers::AssetTagHelper.cache_asset_timestamps = false
            end

            if defined?(ActiveRecord)
              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