code: def view(template=None):
      
      if not template:
          template = "Juice/Plugin/MaintenancePage/index.html"
  
      class Maintenance(View):
  
          @classmethod
          def register(cls, app, **kwargs):
              super(cls, cls).register(app, **kwargs)
  
              if cls.get_config("APPLICATION_MAINTENANCE_ON"):
                  app.logger.info("APPLICATION MAINTENANCE PAGE IS ON")
  
                  @app.before_request
                  def on_maintenance():
                      return cls.render_(layout_=template), 503
  
      return Maintenance
docs: Create the Maintenance view
      Must be instantiated
  
      import maintenance_view
      MaintenanceView = maintenance_view()
  
      :param template_: The directory containing the view pages
      :return: