Rabbit延迟队列实战

灰太狼 2021-07-24 19:59 394阅读 0赞

**一 代码**

1 生产者延迟3秒发送消息到死信队列代码，此时queue.normal队列充当的是延迟队列

package com.rabbitmq.ttl;
    
    import com.rabbitmq.client.Channel;
    import com.rabbitmq.client.Connection;
    import com.rabbitmq.client.ConnectionFactory;
    import com.rabbitmq.client.MessageProperties;
    import com.rabbitmq.util.ConnectionUtils;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.concurrent.TimeoutException;
    
    /**
    * 死信队列（路由键为rk的消息过期后被放置到死信队列）
    */
    public class DealQueue {
        private static final String IP_ADDRESS = "127.0.0.1";
        private static final int PORT = 5672;//RabbitMQ（AMQP） 服务端默认端口号为 5672
        public static void main(String[] args) throws IOException,
                TimeoutException {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost(IP_ADDRESS);
            factory.setUsername("root");
            factory.setPassword("123456");
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();
    
            channel.exchangeDeclare("exchange.dlx", "direct", true, false, null);
            channel.exchangeDeclare("exchange.normal", "fanout", true, false, null);
    
            Map<String, Object> arg = new HashMap<String, Object>(3);
            arg.put("x-message-ttl", 3000);
            arg.put("x-dead-letter-exchange", "exchange.dlx");
    
            channel.queueDeclare("queue.normal", false, false, false, arg);
            channel.queueBind("queue.normal", "exchange.normal", "");
    
            channel.queueDeclare("queue.dlx", false, false, false, null);
            channel.queueBind("queue.dlx", "exchange.dlx", "rk");
    
            String message = "delay message !";
    
            channel.basicPublish("exchange.normal", "rk", false,
                    MessageProperties.PERSISTENT_TEXT_PLAIN,
                    message.getBytes());
    
            ConnectionUtils.close(channel, connection);
        }
    }

2 消费者从死信队列取消息代码

package com.rabbitmq.delay;
    
    import com.rabbitmq.client.*;
    import java.io.IOException;
    import java.util.concurrent.TimeUnit;
    import java.util.concurrent.TimeoutException;
    
    // 延时消费
    public class DelayQueue {
        private static final String IP_ADDRESS = "127.0.0.1";
        private static final int PORT = 5672;//RabbitMQ（AMQP） 服务端默认端口号为 5672
        public static void main(String[] args) throws IOException,
                TimeoutException {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost(IP_ADDRESS);
            factory.setUsername("root");
            factory.setPassword("123456");
            Connection connection = factory.newConnection();
            final Channel channel = connection.createChannel();
            channel.basicQos(64);
            Consumer consumer = new DefaultConsumer(channel) {
                @Override
                public void handleDelivery(String consumerTag,
                                           Envelope envelope,
                                           AMQP.BasicProperties properties,
                                           byte[] body)
                        throws IOException {
                    System.out.println(" recv message: " + new String(body));
                    try {
                        TimeUnit.SECONDS.sleep(1);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    channel.basicAck(envelope.getDeliveryTag(), false);
                }
            };
            channel.basicConsume("queue.dlx", consumer);
        }
    }

**二 测试**

1 消费者控制台打印如下

recv message: delay message !

**三 参考代码**

[https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/ttl/DealQueue.java][https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_ttl_DealQueue.java]

[https://github.com/cakin24/RabbitMQDemo/tree/master/src/main/java/com/rabbitmq/delay][https_github.com_cakin24_RabbitMQDemo_tree_master_src_main_java_com_rabbitmq_delay]

[https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_ttl_DealQueue.java]: https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/ttl/DealQueue.java
[https_github.com_cakin24_RabbitMQDemo_tree_master_src_main_java_com_rabbitmq_delay]: https://github.com/cakin24/RabbitMQDemo/tree/master/src/main/java/com/rabbitmq/delay