Spring 队列名称为空的 AMQP 入站适配器

Question

我正在使用 Spring AMQP that receives messages from RabbitMQ. There is a topic exchange declared. To connect to Rabbit I create a queue with an empty name, because the broker will provide an automatic queue name, see the InterCor M4 Upgraded Specifications Hybrid specifications:

开发消费者应用程序

@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 集成 Java DSL 配置 AMQP Inbound Channel Adapter 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' cannot be null or empty

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。

问题在于，对于代理生成的队列名称，如果连接丢失并重新建立，队列名称将会更改，但容器不会知道新队列并会尝试使用来自旧的。

AnonymousQueue通过框架生成随机名称解决了这个问题。

但是，匿名队列是不持久的，是独占的并且是自动删除的。

如果您想要一个具有不同属性的队列，但仍然想要一个随机名称，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。

Answer 2

AMQP-816 issue has been fixed and now is available in Spring Boot 2.1.0.

更新项目的父项目修复了问题：

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.0.RELEASE</version>
</parent>

空队列名称

spring:
    rabbitmq:
        queue:
            name:
            durable: false
            exclusive: true
            autoDelete: true

创建一个自动队列名称amq.gen-U1vKiSfIvy8bO11jLD29Sw:

非空队列名称

spring:
    rabbitmq:
        queue:
            name: abc
            durable: false
            exclusive: true
            autoDelete: true

创建一个名为 abc:

的队列

Spring 队列名称为空的 AMQP 入站适配器

Spring AMQP Inbound Adapter with empty queue name

rabbitmq

spring-integration

spring-amqp

空队列名称

非空队列名称