spring集成rabbitmq的confirm方法中，ack一直为false?

Question

spirng 5.1.7
rabbitmq 2.1.8
java 1.8

我在测试消息可靠投递的confirm时，是用topic模式来测试的。 当我向交换机发送消息时，我会回调 confirm(CorrelationData correlationData, boolean ack, String cause)。 即使ack发送成功，ack始终为false，并且队列里有这条消息，消费者也可以消费这条消息。

code

producer

  <rabbitmq:queue id="spring_topic_queue01" name="spring_topic_queue01" auto-declare="true"/>
    <rabbitmq:queue id="spring_topic_queue02" name="spring_topic_queue02" auto-declare="true"/>
    <rabbitmq:topic-exchange name="spring_topic_exchange">
        <rabbitmq:bindings>
            <rabbitmq:binding pattern="*.java.#" queue="spring_topic_queue01"/>
            <rabbitmq:binding pattern="*.*.spring" queue="spring_topic_queue02"/>
            <rabbitmq:binding pattern="sql.#" queue="spring_topic_queue02"/>
        </rabbitmq:bindings>
    </rabbitmq:topic-exchange>

consumer

<bean id="topicQueueListener01" class="com.zyl.TopicQueueListener01"/>
    <bean id="topicQueueListener02" class="com.zyl.TopicQueueListener02"/>
    
    <rabbitmq:listener-container connection-factory="connectionFactory">
    
        <rabbitmq:listener ref="topicQueueListener01" queue-names="spring_topic_queue01"/>
        <rabbitmq:listener ref="topicQueueListener02" queue-names="spring_topic_queue02"/>

    </rabbitmq:listener-container>

linstener

public class TopicQueueListener01 implements MessageListener {
    @Override
    public void onMessage(Message message) {
        System.out.println("Consumer1："+new String(message.getBody()));
    }
}

public class TopicQueueListener02 implements MessageListener {
    @Override
    public void onMessage(Message message) {
        System.out.println("Consumer2："+new String(message.getBody()));
    }
}

test

@Test
    public void topicTest() throws InterruptedException {
  
        rabbitTemplate.setConfirmCallback((correlationData, ack, cause) -> {
            if (ack)
                System.out.println("ok!\n"+cause);
            else
                System.out.println("fail!\n"+cause);
        });

        rabbitTemplate.convertAndSend("spring_topic_exchange",
                "sql.ssm.out", "Hello RabbitMQ!");

        Thread.sleep(10);
    }

在测试代码中最后一行，如果加了Thread.sleep(10);则正确输出，ack为true，输出结果为：ok! null，如果没写这行则输出fail! clean channel shutdown; protocol method: #method\<channel.close\>(reply-code=200, reply-text=OK,class-id=0, method-id=0).
链接工厂的publisher-confirms="true"属性我也加了。

正常情况下应该是不用写sleep()吧？

Answer 1

channel关闭异常，这是使用@Test做单元测试才会出现的情况，还未等待channel正常关闭，程序就开始关闭(消息可能还未发送完成)，

rabbitTemplate.convertAndSend("spring_topic_exchange", "sql.ssm.out", "Hello RabbitMQ!");

你加的sleep就是起到了等待消息发送、分发、监听完成的作用，在正常使用中不会有这样的问题。

Answer 2

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

// ...

@Test
public void topicTest() throws InterruptedException {
    CountDownLatch latch = new CountDownLatch(1);

    rabbitTemplate.setConfirmCallback((correlationData, ack, cause) -> {
        if (ack)
            System.out.println("ok!\n" + cause);
        else
            System.out.println("fail!\n" + cause);
        
        latch.countDown();
    });

    rabbitTemplate.convertAndSend("spring_topic_exchange",
            "sql.ssm.out", "Hello RabbitMQ!");

    latch.await(5, TimeUnit.SECONDS); // 等待最多 5 秒，直到 confirmCallback 被触发
}