Question

我需要在一段时间后向MessageListener发送消息，那么有没有办法实现使用Spring AMQP。

例如。生产者生成消息并将消息发送到RabbitMQ Q，消息收到监听器立即收听该Q，我想延迟消息在消费者端接收后说一些配置参数说1000ms

Answer 1

RabbitMQ为此提供了Delayed Exchange功能。

从版本1.6开始，Spring AMQP还提供了关于此问题的高级API：http://docs.spring.io/spring-amqp/reference/html/_reference.html#delayed-message-exchange：

<rabbit:topic-exchange name="topic" delayed="true" />

MessageProperties properties = new MessageProperties();
properties.setDelay(15000);
template.send(exchange, routingKey,
        MessageBuilder.withBody("foo".getBytes()).andProperties(properties).build());

<强>更新

在春季AMQP 1.6之前你应该这样做：

@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);
}

...

MessageProperties properties = new MessageProperties();
properties.setHeader("x-delay", 15000);
template.send(exchange, routingKey,
        MessageBuilder.withBody("foo".getBytes()).andProperties(properties).build());

另请参阅此问题及其答案：Scheduled/Delay messaging in Spring AMQP RabbitMq

Answer 2

如果使用Spring Boot，它可能是这样的：

@Bean
Queue queue() {
    return QueueBuilder.durable(queueName)
            .withArgument("x-dead-letter-exchange", dlx)
            .withArgument("x-dead-letter-routing-key", dlq)
            .build();
}


@Bean
TopicExchange exchange() {
    return (TopicExchange) ExchangeBuilder.topicExchange(topicExchangeName)
            .delayed()
            .build();

@Bean
Binding binding() {
    return BindingBuilder.bind(queue()).to(exchange()).with(queueName);
}

使用Spring AMQP发送给侦听器的延迟消息

2 个答案: