rocket mq 时间表示例——setDelayTimeLevel-优快云博客

本文链接：https://blog.youkuaiyun.com/wanbf123/article/details/77988564

本文介绍了Rocket MQ中如何设置延迟时间发送消息，详细讲解了预定消息的概念及其应用场景，包括消息消费者的等待、预定消息的发送以及消息延迟验证过程。

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时间表示例

计划的消息与正常消息不同，因为它们将在以后提供的时间内不会被传送。

什么是预定的消息？

应用

开始消费者等待传入的订阅消息

 import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
 import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
 import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
 import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
 import org.apache.rocketmq.common.message.MessageExt;
 import java.util.List;
    
 public class ScheduledMessageConsumer {
    
     public static void main(String[] args) throws Exception {
         // Instantiate message consumer
         DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("ExampleConsumer");
         // Subscribe topics
         consumer.subscribe("TestTopic", "*");
         // Register message listener
         consumer.registerMessageListener(new MessageListenerConcurrently() {
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> messages, ConsumeConcurrentlyContext context) {
                 for (MessageExt message : messages) {
                     // Print approximate delay time period
                     System.out.println("Receive message[msgId=" + message.getMsgId() + "] "
                             + (System.currentTimeMillis() - message.getStoreTimestamp()) + "ms later");
                 }
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });
         // Launch consumer
         consumer.start();
     }
 }

发送预定的消息

 import org.apache.rocketmq.client.producer.DefaultMQProducer;
 import org.apache.rocketmq.common.message.Message;
    
 public class ScheduledMessageProducer {
    
     public static void main(String[] args) throws Exception {
         // Instantiate a producer to send scheduled messages
         DefaultMQProducer producer = new DefaultMQProducer("ExampleProducerGroup");
         // Launch producer
         producer.start();
         int totalMessagesToSend = 100;
         for (int i = 0; i < totalMessagesToSend; i++) {
             Message message = new Message("TestTopic", ("Hello scheduled message " + i).getBytes());
             // This message will be delivered to consumer 10 seconds later.
             message.setDelayTimeLevel(3);
             // Send the message
             producer.send(message);
         }
    
         // Shutdown producer after use.
         producer.shutdown();
     }
        
 }