满足空队列条件后如何停止监听？

import pika

def callback(ch, method, properties, body):
    # 处理接收到的消息
    print("Received message:", body)

    # 判断队列是否为空
    if ch.queue_declare(queue='my_queue', passive=True).method.message_count == 0:
        # 停止监听
        ch.stop_consuming()

# 连接到RabbitMQ服务器
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()

# 声明队列
channel.queue_declare(queue='my_queue')

# 注册回调函数
channel.basic_consume(queue='my_queue', on_message_callback=callback, auto_ack=True)

# 开始监听
channel.start_consuming()