code: def refresh(self, props, body):
          
          LOGGER.debug("InjectorCachedComponent.refresh")
          operation = props['OPERATION']
          if operation == "REFRESH":
              if self.parent_actor_ref is not None:
                  parent_actor = self.parent_actor_ref.proxy()
                  parent_actor.sniff().get()
          else:
              LOGGER.error("InjectorCachedComponent.refresh - Unsupported operation " + str(operation))
docs: the refresh method called when on demand refresh service receive a message. then call the parent actor sniff
          method if message is compliant on what is attended
          :param props: the message properties
          :param body: the message body
          :return: