Set the status to Status.stopping and also call `onStopping`
        with the provided args and kwargs.

def stop(self, *args, **kwargs):
        """
        Set the status to Status.stopping and also call `onStopping`
        with the provided args and kwargs.
        """
        if self.status in (Status.stopping, Status.stopped):
            logger.debug("{} is already {}".format(self, self.status.name))
        else:
            self.status = Status.stopping
            self.onStopping(*args, **kwargs)
            self.status = Status.stopped