Official test case of rocketmq4.3.0 consumer producer

• Note that the version of client and server should be the same!!

Add the dependency of rocketmq

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.3.0</version>
</dependency>

Reliable synchronous transmission is widely used in scenarios, such as important notification messages, SMS notifications, SMS marketing systems, etc.

• Consumer groups
• rocketmq address
• Subject, secondary subject (tag), message

/**
 * Reliable synchronous transmission is widely used in scenarios, such as important notification messages, SMS notifications, SMS marketing systems, etc.
 */
public class SyncProducer {
    public static void main(String[] args) throws Exception {
        //Instantiate with a producer group name.
        DefaultMQProducer producer = new
            DefaultMQProducer("please_rename_unique_group_name");
        // Specify name server addresses.
        producer.setNamesrvAddr("192.168.102.134:9876");
        //Launch the instance.
        producer.start();
        for (int i = 0; i < 100; i++) {
            //Create a message instance, specifying topic, tag and message body.
            Message msg = new Message("cancan" /* Topic */,
                "TagA" /* Tag */,
                ("Hello RocketMQ " +
                    i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
            );
            //Call send message to deliver message to one of brokers.
            SendResult sendResult = producer.send(msg);
            System.out.printf("%s%n", sendResult);
        }
        //Shut down once the producer instance is not longer in use.
        producer.shutdown();
    }
}

consumer

• Consumption group
• Consumer address
• Theme, secondary theme (tag)

/**
 * Consumer producer data
 */
public class Consumer {

    public static void main(String[] args) throws InterruptedException, MQClientException {

        // Instantiate with specified consumer group name.
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name");
         
        // Specify name server addresses.
        consumer.setNamesrvAddr("localhost:9876");
        
        // Subscribe one more more topics to consume.
        //Subscription topics, followed by * are secondary topics, also known as tag s
        consumer.subscribe("TopicTest", "*");
        // Register callback to execute on arrival of messages fetched from brokers.
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                for (MessageExt msg : msgs) {
                    String str = new String(msg.getBody());
                    System.out.println("Get message body:"+str);
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        //Launch the consumer instance.
        consumer.start();

        System.out.printf("Consumer Started.%n");
    }
}

Asynchronous transmission is usually used in response time sensitive business scenarios.

• Consumer groups
• rocketmq address
• Topic, secondary topic (tag), key (message distribution is used to determine which server to store), message

/**
 * Asynchronous transmission is usually used in response time sensitive business scenarios.
 */
public class AsyncProducer {
    public static void main(String[] args) throws Exception {
        //Instantiate with a producer group name.
        DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
        // Specify name server addresses.
        producer.setNamesrvAddr("192.168.102.134:9876");
        //Launch the instance.
        producer.start();
        producer.setRetryTimesWhenSendAsyncFailed(0);

        int messageCount = 103;//Number of messages sent
        final CountDownLatch countDownLatch = new CountDownLatch(messageCount);//Define conditions

        for (int i = 0; i < 100; i++) {
                final int index = i;
                //Create a message instance, specifying topic, tag and message body.
                Message msg = new Message("TopicTest",
                    "TagA",
                    "OrderID188",
                    "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
                producer.send(msg, new SendCallback() {

                    public void onSuccess(SendResult sendResult) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d OK %s %n", index,
                            sendResult.getMsgId());
                    }

                    public void onException(Throwable e) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d Exception %s %n", index, e);
                        e.printStackTrace();
                    }
                });
        }
        //Shut down once the producer instance is not longer in use.
        //Thread.sleep(3000); / / delay the execution time of the main thread
        countDownLatch.await(5, TimeUnit.SECONDS);//Up to 100 shut down production (sender)
        producer.shutdown();
    }
}

One way transfers are used for situations that require medium reliability, such as log collection.

• Consumer groups
• rocketmq address
• Subject, secondary subject (tag), message

/**
 * One way transfers are used for situations that require medium reliability, such as log collection.
 */
public class OnewayProducer {

    public static void main(String[] args) throws Exception{
        //Instantiate with a producer group name.
        DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
        // Specify name server addresses.
        producer.setNamesrvAddr("192.168.102.134:9876");
        //Launch the instance.
        producer.start();
        for (int i = 0; i < 100; i++) {
            //Create a message instance, specifying topic, tag and message body.
            Message msg = new Message("TopicTest" /* Topic */,
                "TagA" /* Tag */,
                ("Hello RocketMQ " +
                    i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
            );
            //Call send message to deliver message to one of brokers.
            producer.sendOneway(msg);

        }
        //Shut down once the producer instance is not longer in use.
        producer.shutdown();
    }
}

rocketmq keyword description

Refer to my previous post: https://blog.csdn.net/qq_34168515/article/details/106534430