code: def _check_alive(self):
      return (
          self._channel
          and self._channel.is_open
          and self._conn
          and self._conn.is_open
      )
  
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 10 for calling the MQChannel obj's underlying member method code with example usage: obj._check_alive() and returns: unknown