def add_on_cancel_callback(self):
_logger.debug('<STR_LIT>')<EOL>self._channel.add_on_cancel_callback(self.on_consumer_cancelled)<EOL>
Add a callback that will be invoked if RabbitMQ cancels the consumer
        for some reason. If RabbitMQ does cancel the consumer,
        on_consumer_cancelled will be invoked by pika.