@Override
	public void stop() {
		if (running && null != defaultMQProducer) {
			defaultMQProducer.shutdown();
		}
		running = false;
	}
@author <a href="mailto:fangjian0423@gmail.com">Jim</a>
spring-cloud-alibaba-starters/spring-cloud-starter-stream-rocketmq/src/main/java/com/alibaba/cloud/stream/binder/rocketmq/integration/outbound/RocketMQProducerMessageHandler.java