【Java】RocketMQ

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.9.4</version>
</dependency>

package com.runsky.sys.rocketMQ;

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.LocalTransactionState;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.client.producer.TransactionListener;
import org.apache.rocketmq.client.producer.TransactionMQProducer;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.remoting.common.RemotingHelper;

import java.io.UnsupportedEncodingException;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;

public class TransactionProducer {
    public static void main(String[] args) throws MQClientException, InterruptedException {
        TransactionListener transactionListener = new TransactionListenerImpl();
        TransactionMQProducer producer = new TransactionMQProducer("ls_group");
        ExecutorService executorService = new ThreadPoolExecutor(2, 5, 100, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(2000), new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                Thread thread = new Thread(r);
                thread.setName("client-transaction-msg-check-thread");
                return thread;
            }
        });

        producer.setNamesrvAddr("59.110.70.86:9876");
        producer.setExecutorService(executorService);
        producer.setTransactionListener(transactionListener);
        producer.start();

        String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};
        for (int i = 0; i < 10; i++) {
            try {
                Message msg =
                        new Message("ls-dating-info-add", tags[i % tags.length], "KEY" + i,
                                ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET));
                SendResult sendResult = producer.sendMessageInTransaction(msg, null);
                System.out.printf("%s%n", sendResult);

                Thread.sleep(10);
            } catch (MQClientException | UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }

        for (int i = 0; i < 100000; i++) {
            Thread.sleep(1000);
        }
        producer.shutdown();
    }

    static class TransactionListenerImpl implements TransactionListener {
        private AtomicInteger transactionIndex = new AtomicInteger(0);

        private ConcurrentHashMap<String, Integer> localTrans = new ConcurrentHashMap<>();

        @Override
        public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
            int value = transactionIndex.getAndIncrement();
            int status = value % 3;
            localTrans.put(msg.getTransactionId(), status);

            System.out.println("事务检查");
            return LocalTransactionState.UNKNOW;
        }

        @Override
        public LocalTransactionState checkLocalTransaction(MessageExt msg) {
            Integer status = localTrans.get(msg.getTransactionId());
            if (null != status) {
                switch (status) {
                    case 0:
                        return LocalTransactionState.UNKNOW;
                    case 1:
                        return LocalTransactionState.COMMIT_MESSAGE;
                    case 2:
                        return LocalTransactionState.ROLLBACK_MESSAGE;
                    default:
                        return LocalTransactionState.COMMIT_MESSAGE;
                }
            }
            System.out.println("事务确认");
            return LocalTransactionState.COMMIT_MESSAGE;
        }
    }
}