Java RabbitMQ的TTL和DLX全面精解

目录

• RabbitMQ的TTL
  • 1、TTL概述
  • 2、设置消息有效期
    • 2.1、通过队列设置有效期
    • 2.2、通过发送消息时设置有效期
  • 3、设置队列有效期（不常用，仅作了解）
• RabbitMQ的DLX
  • 1、DLX是什么
  • 2、DLX有什么用
  • 3、DLX使用方式

//设置队列上所有的消息的有效期,单位为毫秒
Map<String, Object> argss = new HashMap<String , Object>();
arguments.put("x-message-ttl " , 5000);//5秒钟
channel.queueDeclare(queueName , durable , exclusive , autoDelete , arguments) ;

rabbitmqctl set_policy TTL ".*" "{"message-ttl":60000}" --apply-to queues

$ curl -i -u guest:guest -H "content-type:application/json"  -XPUT -d"{"auto_delete":false,"durable":true,"arguments":{"x-message-ttl": 60000}}" 
http://ip:15672/api/queues/{vhost}/{queuename}

Builder bd = new AMQP.BasicProperties().builder();
bd.deliveryMode(2);//持久化
bd.expiration("100000");//设置消息有效期100秒钟
BasicProperties pros = bd.build();
String message = "测试ttl消息";
channel.basicPublish(EXCHANGE_NAME, "error", true,false, pros, message.getBytes());

$ curl -i -u guest:guest -H "content-type:application/json"  -XPOST -d
"{"properties":{"expiration":"60000"},"routing_key":"routingkey","payload":"my body","payload_encoding":"string"}"  
http://localhost:15672/api/exchanges/{vhost}/{exchangename}/publish

package cn.wkp.rabbitmq.newest.ttl;
 
import java.util.HashMap;
import java.util.Map;
 
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.AMQP.BasicProperties.Builder;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
 
import cn.wkp.rabbitmq.util.ConnectionUtil;
 
/**
 * 
 * @ClassName: Send
 * @Description: 消息有效期 
 * @author wkg
 * @date: 2019年4月1日 下午11:28:22
 */
public class Send {
 
	private final static String EXCHANGE_NAME = "ttl_exchange";
	private final static String QUEUE_NAME = "ttl_queue";
 
	public static void main(String[] argv) throws Exception {
		// 获取到连接以及mq通道
		Connection connection = ConnectionUtil.getConnection();
		// 从连接中创建通道
		Channel channel = connection.createChannel();
 
		// 声明交换机
		channel.exchangeDeclare(EXCHANGE_NAME, "direct",true);
		
		//*****1:通过队列设置有效期 2:通过消息属性设置有效期,如果都设置了以较小的为准*****
		//声明队列
		Map<String, Object> arguments=new HashMap<String,Object>();
		//设置队列上所有的消息的有效期,单位为毫秒
		arguments.put("x-message-ttl", 5000);//5秒钟
		channel.queueDeclare(QUEUE_NAME, true, false, false, arguments);
		//绑定
		channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "error");
		
		Builder bd = new AMQP.BasicProperties().builder();
		bd.deliveryMode(2);//持久化
		bd.expiration("100000");//设置消息有效期100秒钟
		BasicProperties pros = bd.build();
		String message = "测试ttl消息";
		channel.basicPublish(EXCHANGE_NAME, "error", true,false, pros, message.getBytes());
		System.out.println("Sent message:" + message);
//		 关闭通道和连接
		channel.close();
		connection.close();
	}
}

Map<String, Object> args = new HashMap<String, Object>();  
args.put("x-expires", 18000);  //队列有效期18秒
channel.queueDeclare("myqueue", false, false, false, args);  

channel.exchangeDeclare("dlx_exchange" , "direct"); //创建DLX: dlx_exchange
Map<String, Object> args = new HashMap<String, Object>();
args.put("x-dead-letter-exchange" , "dlx_exchange ");//设置DLX
args.put("x-dead-letter-routing-key" , "dlx-routing-key");//设置DLX的路由键(可以不设置)
//为队列myqueue 添加DLX
channel.queueDeclare("myqueue" , false , false , false , args);

package cn.wkp.rabbitmq.newest.dlx;
 
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
 
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.MessageProperties;
 
import cn.wkp.rabbitmq.util.ConnectionUtil;
 
public class SendDLX {
 
	public static void main(String[] args) throws Exception {
		Connection connection = ConnectionUtil.getConnection();
		Channel channel = connection.createChannel();
		//声明一个交换机，做死信交换机用
		channel.exchangeDeclare("dlx_exchange", "topic", true, false, null);
		//声明一个队列，做死信队列用
		channel.queueDeclare("dlx_queue", true, false, false, null);
		//队列绑定到交换机上
		channel.queueBind("dlx_queue", "dlx_exchange", "dlx.*");
		
		channel.exchangeDeclare("normal_exchange", "fanout", true, false, null);
		Map<String, Object> arguments=new HashMap<String, Object>();
		arguments.put("x-message-ttl" , 5000);//设置消息有效期1秒，过期后变成私信消息，然后进入DLX
		arguments.put("x-dead-letter-exchange" , "dlx_exchange");//设置DLX
		arguments.put("x-dead-letter-routing-key" , "dlx.test");//设置DLX的路由键(可以不设置)
		//为队列normal_queue 添加DLX
		channel.queueDeclare("normal_queue", true, false, false, arguments);
		channel.queueBind("normal_queue", "normal_exchange", "");
		
		channel.basicPublish("normal_exchange", "", MessageProperties.PERSISTENT_TEXT_PLAIN, ("测试死信消息").getBytes());
		System.out.println("发送消息时间:"+ConnectionUtil.formatDate(new Date()));
		
		channel.close();
		connection.close();
	}
}

package cn.wkp.rabbitmq.newest.dlx;
 
import java.io.IOException;
import java.util.Date;
 
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
 
import cn.wkp.rabbitmq.util.ConnectionUtil;
 
public class RecvDLX {
 
	public static void main(String[] argv) throws Exception {
		Connection connection = ConnectionUtil.getConnection();
		final Channel channel = connection.createChannel();
 
		channel.exchangeDeclare("dlx_exchange", "topic", true, false, null);
		channel.queueDeclare("dlx_queue", true, false, false, null);
		channel.queueBind("dlx_queue", "dlx_exchange", "dlx.*");
 
		// 指该消费者在接收到队列里的消息但没有返回确认结果之前,它不会将新的消息分发给它。
		channel.basicQos(1);
 
		Consumer consumer = new DefaultConsumer(channel) {
			@Override
			public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
					throws IOException {
				System.out.println("消费者收到消息:" + new String(body)+",当前时间:"+ConnectionUtil.formatDate(new Date()));
				// 消费者手动发送ack应答
				channel.basicAck(envelope.getDeliveryTag(), false);
			}
		};
		System.out.println("消费死信队列中的消息======================");
		// 监听队列
		channel.basicConsume("dlx_queue", false, consumer);
	}
}