code: def plug(self):
          '''Add the actor's methods to the callback registry.'''
          if self.__plugged:
              return
          for _, method in inspect.getmembers(self, predicate=inspect.ismethod):
              if hasattr(method, '_callback_messages'):
                  for message in method._callback_messages:
                      global_callbacks[message].add(method)
          self.__plugged = Truf plug(self):
          '''Add the actor's methods to the callback registry.'''
          if self.__plugged:
              return
          for _, method in inspect.getmembers(self, predicate=inspect.ismethod):
              if hasattr(method, '_callback_messages'):
                  for message in method._callback_messages:
                      global_callbacks[message].add(method)
          self.__plugged = True
docs: Add the actor's methods to the callback registry.