具有空队列名称的Spring AMQP入站适配器

Question

我正在使用Spring AMQP开发一个消费者应用程序,它接收来自RabbitMQ的消息.宣布了一个主题交换.要连接到Rabbit,我创建一个空名称的队列,因为代理将提供自动队列名称,请参阅规范:

@Bean
public TopicExchange exchange() {
    TopicExchange topicExchange = new TopicExchange(topicExchangeName);
    topicExchange.setShouldDeclare(false);
    return topicExchange;
}

@Bean
public Queue queue() {
  return new Queue("", queueDurable, queueExclusive, queueAutoDelete, queueParameters);
}

@Bean
public Binding binding(Queue queue, TopicExchange exchange) {
    return BindingBuilder.bind(queue).to(exchange).with(routingKey);
}

但是当我尝试使用Spring Integration Java DSL 配置AMQP入站通道适配器时:

@Autowired
private Queue queue;

@Bean
public IntegrationFlow amqpInbound(ConnectionFactory connectionFactory) {
  return IntegrationFlows.from(Amqp.inboundAdapter(connectionFactory, queue))
      .handle(m -> System.out.println(m.getPayload()))
      .get();
}

我得到一个错误'queueName'不能为null或为空

2018-05-25 13:39:15.080 ERROR 14636 --- [erContainer#0-1] o.s.a.r.l.SimpleMessageListenerContainer : Failed to check/redeclare auto-delete queue(s).

java.lang.IllegalArgumentException: 'queueName' cannot be null or empty
    at org.springframework.util.Assert.hasText(Assert.java:276) ~[spring-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.amqp.rabbit.core.RabbitAdmin.getQueueProperties(RabbitAdmin.java:337) ~[spring-rabbit-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.redeclareElementsIfNecessary(AbstractMessageListenerContainer.java:1604) ~[spring-rabbit-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:963) [spring-rabbit-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_162]

如何将消息队列名称的值设置为空字符串？

Answer 1

这不是一个好的解决方案.

问题是,使用代理生成的队列名称,如果连接丢失并重新建立,则队列名称将更改,但容器将不知道新队列并将尝试使用旧队列.

AnonymousQueue 通过生成随机名称的框架解决了这个问题.

但是,匿名队列不是持久的,是独占的并且是自动删除的.

如果您希望队列具有不同的属性,但仍需要随机名称,请使用

@Bean
public Queue queue() {
  return new Queue(new AnonymousQueue.Base64UrlNamingStrategy().generateName(),
      queueDurable, queueExclusive, queueAutoDelete, queueParameters);
}

这样,如果连接丢失并重新建立,队列将获得相同的名称.