tencent cloud

<!-- in your <dependencies> block -->
  <dependency>
      <groupId>org.apache.rocketmq</groupId>
      <artifactId>rocketmq-client</artifactId>
      <version>4.9.4</version>
  </dependency>
  
  <dependency>
      <groupId>org.apache.rocketmq</groupId>
      <artifactId>rocketmq-acl</artifactId>
      <version>4.9.4</version>
  </dependency>

// Instantiate the message producer
   DefaultMQProducer producer = new DefaultMQProducer(
       groupName,
       new AclClientRPCHook(new SessionCredentials(accessKey, secretKey)) // ACL permission
   );
   // Set the Nameserver address
   producer.setNamesrvAddr(nameserver);
   // Start the producer instance
   producer.start();


int totalMessagesToSend = 1;
for (int i = 0; i < totalMessagesToSend; i++) {    
    Message message = new Message(TOPIC_NAME, ("Hello timer message " + i).getBytes());    
    // Set the time for sending the message    
    long timeStamp = System.currentTimeMillis() + 30000;    
    // To send a timed message, you need to specify a time for it, and the message will be delivered at the specified time. For example, if you set the time to be 2022-08-08 08:08:08, the message will be delivered at 2022-08-08 08:08:08.    
    // If the timestamp is set before the current time, the message will be delivered to the consumer immediately.    
    // Set `__STARTDELIVERTIME` into the property of `msg`    
    message.putUserProperty("__STARTDELIVERTIME", String.valueOf(timeStamp));    
    // Send the message    
    SendResult sendResult = producer.send(message);    
    System.out.println("sendResult = " + sendResult);
}

// Instantiate the consumer
        DefaultMQPushConsumer pushConsumer = new DefaultMQPushConsumer(
            groupName,                                              
            new AclClientRPCHook(new SessionCredentials(accessKey, secretKey))); //ACL permission
        // Set the Nameserver address
        pushConsumer.setNamesrvAddr(nameserver);

// Subscribe to a topic
      pushConsumer.subscribe(topic_name, "*");
      // Register a callback implementation class to process messages pulled from the broker
      pushConsumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> {
          // Message processing logic
          System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
          // Mark the message as being successfully consumed and return the consumption status
          return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
      });
      // Start the consumer instance
      pushConsumer.start();