RocketMQ 的基礎使用

集羣搭建

namesrv 之間無狀態的 每個broker都要向所有的namesrv 上報自己的狀態
broker 分爲主從 爲0 是主節點 一個主節點 可以有多個從節點

同步消息

同步等待消息已經發出

/**
 * 發送同步消息
 */
public class SyncProducer {

    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("group1");
        producer.setNamesrvAddr(Common.WIN.getIpAddress());
        producer.start();
        for (int i = 0; i < 10; i++) {
            Message msg = new Message("springboot-mq", "Tag1", ("Hello World" + i).getBytes());
            SendResult result = producer.send(msg);
            SendStatus status = result.getSendStatus();
            System.out.println("發送結果:" + result);
            TimeUnit.SECONDS.sleep(1);
        }
        producer.shutdown();
    }
}

異步消息

設置回調函數 來監聽發送的情況

/**
 * 發送異步消息
 *
 */
public class AsyncProducer {

    public static void main(String[] args) throws Exception {
        //1.創建消息生產者producer，並制定生產者組名
        DefaultMQProducer producer = new DefaultMQProducer("group1");
        //2.指定Nameserver地址
        producer.setNamesrvAddr(Common.WIN.getIpAddress());
        //3.啓動producer
        producer.start();

        for (int i = 0; i < 10; i++) {
            Message msg = new Message("base", "Tag2", ("Hello World" + i).getBytes());
            producer.send(msg, new SendCallback() {
                public void onSuccess(SendResult sendResult) {
                    System.out.println("發送結果：" + sendResult);
                }
                public void onException(Throwable e) {
                    System.out.println("發送異常：" + e);
                }
            });
            TimeUnit.SECONDS.sleep(1);
        }
        //6.關閉生產者producer
        producer.shutdown();
    }
}

發送單向消息

單向消息 用在發送結果不是很重要的業務場景

/**
 * 發送單向消息
 */
public class OneWayProducer {

    public static void main(String[] args) throws Exception, MQBrokerException {
        DefaultMQProducer producer = new DefaultMQProducer("group1");
        producer.setNamesrvAddr(Common.WIN.getIpAddress());
        producer.start();

        for (int i = 0; i < 3; i++) {
            Message msg = new Message("base", "Tag3", ("Hello World，單向消息" + i).getBytes());
            producer.sendOneway(msg);
            TimeUnit.SECONDS.sleep(5);
        }
        producer.shutdown();
    }
}

發送順序消息

保證順序就是 將同一個業務產生的消息 發送至同一個消息隊列 發送的時候可以選擇消息隊列 取餘或哈希
發送端

public class Producer {

    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("group1");
        producer.setNamesrvAddr(Common.WIN.getIpAddress());
        producer.start();
        //構建消息集合
        List<OrderStep> orderSteps = OrderStep.buildOrders();
        //發送消息
        for (int i = 0; i < orderSteps.size(); i++) {
            String body = orderSteps.get(i) + "";
            Message message = new Message("OrderTopic", "Order", "i" + i, body.getBytes());
            /**
             * 參數一：消息對象
             * 參數二：消息隊列的選擇器
             * 參數三：選擇隊列的業務標識（訂單ID）
             */
            SendResult sendResult = producer.send(message, new MessageQueueSelector() {
                /**
                 * @param mqs：隊列集合
                 * @param msg：消息對象
                 * @param arg：業務標識的參數
                 * @return
                 */
                @Override
                public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                    long orderId = (long) arg;
                    long index = orderId % mqs.size();
                    return mqs.get((int) index);
                }
            }, orderSteps.get(i).getOrderId());

            System.out.println("發送結果：" + sendResult);
        }
        producer.shutdown();
    }

}

接收端
在接收端 註冊的是 順序消費監聽器

public class Consumer {
    public static void main(String[] args) throws MQClientException {
        //1.創建消費者Consumer，制定消費者組名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group1");
        //2.指定Nameserver地址
        consumer.setNamesrvAddr(Common.WIN.getIpAddress());
        //3.訂閱主題Topic和Tag
        consumer.subscribe("OrderTopic", "*");
        //4.註冊消息監聽器
        consumer.registerMessageListener(new MessageListenerOrderly() {

            @Override
            public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) {
                for (MessageExt msg : msgs) {
                    System.out.println("線程名稱：【" + Thread.currentThread().getName() + "】:" + new String(msg.getBody()));
                }
                return ConsumeOrderlyStatus.SUCCESS;
            }
        });

        //5.啓動消費者
        consumer.start();

        System.out.println("消費者啓動");

    }
}

發送事務消息

producer 發送消息之後 屬於半消息 短暫時間內 對消費者不可見
producer 可以對消息進行提交和回滾
mqservev會對消息進行回查 來檢測消息的狀態

發送端 需要註冊 事務監聽器

public class Producer {

    public static void main(String[] args) throws Exception {
        //1.創建消息生產者producer，並制定生產者組名
        TransactionMQProducer producer = new TransactionMQProducer("group5");
        //2.指定Nameserver地址
        producer.setNamesrvAddr(Common.WIN.getIpAddress());
        //添加事務監聽器
        producer.setTransactionListener(new TransactionListener() {
            /**
             * 在該方法中執行本地事務
             * @param msg
             * @param arg
             * @return
             */
            @Override
            public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
                if (StringUtils.equals("TAGA", msg.getTags())) {
                    return LocalTransactionState.COMMIT_MESSAGE;
                } else if (StringUtils.equals("TAGB", msg.getTags())) {
                    return LocalTransactionState.ROLLBACK_MESSAGE;
                } else if (StringUtils.equals("TAGC", msg.getTags())) {
                    return LocalTransactionState.UNKNOW;
                }
                return LocalTransactionState.UNKNOW;
            }

            /**
             * 該方法時MQ進行消息事務狀態回查
             * @param msg
             * @return
             */
            @Override
            public LocalTransactionState checkLocalTransaction(MessageExt msg) {
                System.out.println("消息的Tag:" + msg.getTags());
                return LocalTransactionState.COMMIT_MESSAGE;
            }
        });

        //3.啓動producer
        producer.start();

        String[] tags = {"TAGA", "TAGB", "TAGC"};

        for (int i = 0; i < 3; i++) {
            //4.創建消息對象，指定主題Topic、Tag和消息體
            /**
             * 參數一：消息主題Topic
             * 參數二：消息Tag
             * 參數三：消息內容
             */
            Message msg = new Message("TransactionTopic", tags[i], ("Hello World" + i).getBytes());
            //5.發送消息
            SendResult result = producer.sendMessageInTransaction(msg, null);
            //發送狀態
            SendStatus status = result.getSendStatus();
            System.out.println("發送結果:" + result);
            //線程睡1秒
            TimeUnit.SECONDS.sleep(2);
        }

        //6.關閉生產者producer
        //producer.shutdown();
    }
}

消費端

public class Consumer {

    public static void main(String[] args) throws Exception {
        //1.創建消費者Consumer，制定消費者組名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group1");
        //2.指定Nameserver地址
        consumer.setNamesrvAddr(Common.WIN.getIpAddress());
        //3.訂閱主題Topic和Tag
        consumer.subscribe("TransactionTopic", "*");
        
        //4.設置回調函數，處理消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            //接受消息內容
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                for (MessageExt msg : msgs) {
                    System.out.println("consumeThread=" + Thread.currentThread().getName() + "," + new String(msg.getBody()));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        //5.啓動消費者consumer
        consumer.start();
        System.out.println("生產者啓動");
    }
}

與Spring Boot 集成

01 引入jar包

		<properties>
        	<rocketmq-spring-boot-starter-version>2.0.3</rocketmq-spring-boot-starter-version>
        </properties>
 		<dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-spring-boot-starter</artifactId>
            <version>${rocketmq-spring-boot-starter-version}</version>
        </dependency>
        

02 消費者
其中 集成的RocketMQLister T 是發送的消息類型

@Component
@RocketMQMessageListener(topic = "springboot-mq",consumerGroup = "springboot-mq-consumer-1")
public class Consumer implements RocketMQListener<String> {

    @Override
    public void onMessage(String message) {
        log.info("Receive message："+message);
    }
}