消费者在ActiveMQ中的致谢 [英] Acknowledgement from Consumer in ActiveMQ

问题描述

我正在使用ActiveMQ编写Java应用程序.我有一个生产者类(需要用户输入)和一个带有侦听器的消费者类，以便消息到达后，消息侦听器立即执行onMessage(msg)函数. 但是，我的问题是，消费者何时将确认发送回给经纪人，以使味精从经纪人中出队?是在完成onMessage(msg)函数中编写的动作之后还是只是在调用onMessage(msg)函数时?

I am writing a Java application using ActiveMQ. I have a Producer Class (which takes user input) and a Consumer Class with a listener, so that as soon as messages arrive, Message Listener executes the onMessage(msg) function. My question, though, is when does a consumer sends back the acknowledgement to the broker, so that the msg is de-queued from the broker? Is it after completing the actions written in the onMessage(msg) function or is it just when the onMessage(msg) function is invoked?

推荐答案

在正常情况下，ack是在onMessage完成后发送的，因为它需要处理onMessage引发异常的情况.

In the normal case the ack is sent after the onMessage completes since it needs to handle the case of onMessage throwing an exception.

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