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>

public class TransactionListenerImpl implements TransactionListener {

    //半消息发送成功后，回调该方法执行本地事务
    @Override
    public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
      //这里执行数据库事务，如果成功，就返回成功，否则返回未知，或者回滚，等待回查
      return LocalTransactionState.UNKNOW;
    }
    //回查本地事务
    @Override
    public LocalTransactionState checkLocalTransaction(MessageExt msg) {
       //这里查询本地db的数据状态，然后决定是否是否提交
       return LocalTransactionState.COMMIT_MESSAGE;
    }

}

//需要用户实现一个TransactionListener 实例，
TransactionListener transactionListener = new TransactionListenerImpl();
// 实例化事务消息生产者
ProducerTransactionMQProducer producer = new TransactionMQProducer("transaction_group",        
// ACL权限        
new AclClientRPCHook(new SessionCredentials(ClientCreater.ACCESS_KEY, ClientCreater.SECRET_KEY)));
// 设置NameServer的地址
producer.setNamesrvAddr(ClientCreater.NAMESERVER);
producer.setTransactionListener(transactionListener);
producer.start();

for (int i = 0; i < 3; i++) {    
    // 构造消息示例    
    Message msg = new Message(TOPIC_NAME, "your tag", "KEY" + i,("Hello RocketMQ " + i).getBytes(StandardCharsets.UTF_8));    
    SendResult sendResult = producer.sendMessageInTransaction(msg,null);    
     System.out.printf("%s%n", sendResult);
}

// 实例化消费者
        DefaultMQPushConsumer pushConsumer = new DefaultMQPushConsumer(
            groupName,                                              
            new AclClientRPCHook(new SessionCredentials(accessKey, secretKey))); //ACL权限
        // 设置NameServer的地址
        pushConsumer.setNamesrvAddr(nameserver);
        pushConsumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> { 
           // 消息处理逻辑    
           System.out.printf("%s Receive transaction messages: %s %n", Thread.currentThread().getName(), msgs);    
           // 标记该消息已经被成功消费    
           return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
           });

// 订阅topic
      pushConsumer.subscribe(topic_name, "*");
      // 注册回调实现类来处理从broker拉取回来的消息
      pushConsumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> {
          // 消息处理逻辑
          System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
          // 标记该消息已经被成功消费, 根据消费情况，返回处理状态
          return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
      });
      // 启动消费者实例
      pushConsumer.start();