SpringBoot RabbitMQ 延迟队列代码实现
Posted therhyme
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场景
用户下单后,如果30min未支付,则删除该订单,这时候就要可以用延迟队列
准备
利用rabbitmq_delayed_message_exchange插件;
首先下载该插件:https://www.rabbitmq.com/community-plugins.html
然后把该插件放到rabbitmq安装目录plugins下;
进入到sbin目录下,执行"rabbitmq-plugins.bat enable rabbitmq_delayed_message_exchange";
关闭RabbitMQ服务,然后再启动(直接重启该插件可能会不生效)。
SpringBoot RabbitMQ代码
application.properties配置文件
spring.application.name=spring-boot-rabbitmq spring.rabbitmq.host=localhost spring.rabbitmq.port=5672 spring.rabbitmq.username=nut spring.rabbitmq.password=nut
配置类
注意这里的"x-delayed-type"和"x-delayed-message"
/** * 延迟队列配置exchange */ @Configuration public class DelayQueueConfig public static final String DELAY_EXCHANGE = "DELAY_EXCHANGE"; public static final String DELAY_QUEUE = "DELAY_QUEUE"; public static final String DELAY_ROUTING_KEY = "DELAY_ROUTING_KEY"; @Bean("delayExchange") public Exchange delayExchange() Map<String, Object> args = new HashMap<>(1); // x-delayed-type 声明 延迟队列Exchange的类型 args.put("x-delayed-type", "direct"); return new CustomExchange(DELAY_EXCHANGE, "x-delayed-message",true, false,args); @Bean("delayQueue") public Queue delayQueue() return QueueBuilder.durable(DELAY_QUEUE).build(); /** * 将延迟队列通过routingKey绑定到延迟交换器 * * @return */ @Bean public Binding delayQueueBindExchange() return new Binding(DELAY_QUEUE, Binding.DestinationType.QUEUE, DELAY_EXCHANGE, DELAY_ROUTING_KEY, null);
生产者
发送消息时,指定延迟的毫秒
/** * 延迟队列发送者 */ @Component @Slf4j public class DelayQueueSender @Autowired private RabbitTemplate rabbitTemplate; public void sendDelayQueue(int number) log.warn("延迟队列发送 : milliseconds", number); // 这里的Exchange可以是业务的Exchange,为了方便测试这里直接往死信Exchange里投递消息 rabbitTemplate.convertAndSend( DelayQueueConfig.DELAY_EXCHANGE, DelayQueueConfig.DELAY_ROUTING_KEY, number, (message) -> // 设置延迟的毫秒数 message.getMessageProperties().setDelay(number); log.info("Now : ", ZonedDateTime.now()); return message; );
消费者
/** * 延迟队列消费者 */ @Component @Slf4j @RabbitListener(queues = DelayQueueConfig.DELAY_QUEUE) public class DelayQueueConsumer @RabbitHandler public void receiveDelayMessage(Integer milliseconds) log.warn("DelayQueueConsumer Time : , and the millis : ", ZonedDateTime.now(), milliseconds);
测试
先启动项目;
然后在测试类中发送消息;
@RunWith(SpringRunner.class) @SpringBootTest public class RabbitmqApplicationTests @Autowired private DelayQueueSender delayQueueSender; @Test public void testDelayQueueSender() delayQueueSender.sendDelayQueue(5000);
发送消息窗口:
消费者受到消息:
时间间隔证明延迟队列发送完成!
参考:
https://blog.csdn.net/linsongbin1/article/details/80178122
https://blog.csdn.net/youjin/article/details/82586888
https://docs.spring.io/spring-amqp/docs/2.0.0.M2/reference/htmlsingle/#delayed-message-exchange
https://www.rabbitmq.com/blog/2015/04/16/scheduling-messages-with-rabbitmq/
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