rabbitmq - Spring AMQP RabbitMq 中的计划/延迟消息传递

Question

我正在努力寻找 Spring AMQP/Rabbit MQ 中计划/延迟消息的方法。
经过大量搜索，我仍然无法在 Spring AMQP 中做到这一点。有人可以告诉我如何在 Spring AMQP 中执行x-delay。
如果消费者端发生某些异常，我想延迟消息。 RabbitMQ 说添加 x-delay 并安装我已经完成的插件，但消息仍然立即发送，没有任何延迟

我在消息中收到此信息
已收到 <(Body:'[B@60a4ae5f(byte[26])'MessageProperties [headers={x-delay=15000}

 @Bean
ConnectionFactory connectionFactory(){

    CachingConnectionFactory connectionFactory=new CachingConnectionFactory("127.0.0.1");
    connectionFactory.setUsername("guest");
    connectionFactory.setPassword("guest");
    connectionFactory.setPort(1500);
    connectionFactory.setPublisherReturns(true);
    return connectionFactory;

}

@Bean
Binding binding(@Qualifier("queue")Queue queue, DirectExchange exchange) {
    return new Binding(queue.getName(), Binding.DestinationType.QUEUE, exchange.getName(), queue.getName(), null);
    //return BindingBuilder.bind(queue).to(exchange).with(queueName);   
}

@Bean
DirectExchange exchange() {
    DirectExchange exchange=new DirectExchange("delay-exchange");
    return exchange;
}

消费者---
@覆盖

public void onMessage(Message message, Channel channel) throws Exception {

    System.out.println("Received <" + message+ ">" +rabbitTemplate);

    if(i==1){
        AMQP.BasicProperties.Builder props = new AMQP.BasicProperties.Builder();
        Map<String,Object> headers = message.getMessageProperties().getHeaders();
        headers.put("x-delay", 15000);
        props.headers(headers);
        i++;
        channel.basicPublish(message.getMessageProperties().getReceivedExchange(), message.getMessageProperties().getReceivedRoutingKey(),
                props.build(), message.getBody());
    }
    }

Answer 1

首先看起来您没有遵循Scheduling Messages with RabbitMQ文章:

To use the Delayed Message Exchange you just need to declare an exchange providing the "x-delayed-message" exchange type as follows:

Map<String, Object> args = new HashMap<String, Object>();
args.put("x-delayed-type", "direct");
channel.exchangeDeclare("my-exchange", "x-delayed-message", true, false, args);

我想说使用 Spring AMQP 也可以实现同样的效果:

@Bean
CustomExchange delayExchange() {
    Map<String, Object> args = new HashMap<String, Object>();
    args.put("x-delayed-type", "direct");
    return new CustomExchange("my-exchange", "x-delayed-message", true, false, args);
}

另一个问题是您确实应该将消息发布到该delay-exchange，而不是任何其他。再说一遍:无论如何，该文档中提到了这一点。

更新

自 Spring AMQP 1.6 起，延迟消息作为开箱即用的功能得到支持: https://spring.io/blog/2016/02/16/spring-amqp-1-6-0-milestone-1-and-1-5-4-available .