code: def _clear(self):
      try:
          if self._conn and self._conn.is_open:
              self._conn.close()
          self._conn = None
  
          if self._channel and self._channel.is_open:
              self._channel.close()
          self._channel = None
      except Exception as e:
          LOGGER.exception(e)
          self._conn = None
          self._channel = None
  
file_path: FATE/python/fate/arch/federation/backends/rabbitmq/_mq_channel.py
imports: import json
  import logging
  import pika
  from fate.arch.federation.message_queue import nretry
label_desc: Use image node_id 9 for calling the MQChannel obj's underlying member method code with example usage: obj._clear() without return types