Daily record - SpringBoot integrates RabbitMQ Section 6 (lazy queue)

Starting from version 3.6.0 of RabbitMQ, the concept of Lazy Queues, that is, lazy queues, has been added.

The characteristics of lazy queue are as follows:

1. After receiving the message, it is directly stored on disk instead of memory;
2. Consumers read from disk and load into memory when they want to consume messages;
3. Support millions of message storage;

1. How to define lazy queue

To set a queue as a lazy queue, you only need to specify the x-queue-mode attribute as lazy when declaring the queue.
Lazy queues can be defined through command line, @Bean, and annotation. Here we only talk about @Bean and @RabbitListener.

1. @Bean way to define lazy queue (recommended this way)

@Bean
public Queue lazyQueue(){
    
    
    return QueueBuilder.durable("lazy.queue")
            .lazy() //设置为惰性队列
            .build();
}

@Bean
public Queue lazyQueue(){
    
    
         Map<String, Object> args = new HashMap();
        //队列设置给惰性队列
        args.put("x-queue-mode", "lazy");
        return new Queue("lazy.queue",true,false,false,args);
}

2. @RabbitListener way to define lazy queue

When declaring the queue in the @RabbitListener annotation, add the x-queue-mode parameter

@RabbitListener(queuesToDeclare = @Queue(
        value = "lazy.queue",
        durable = "true",
        arguments = @Argument(name = "x-queue-mode", value = "lazy")
))
public void handleLazyQueueMsg(String msg) {
    
    

}