RocketMq初探

1.安裝

具體請參考官方說明:http://rocketmq.apache.org/docs/quick-start/

2.啓動服務

2.1 啓動Name Server

nohup sh bin/mqnamesrv &

2.2啓動Broker

nohup sh bin/mqbroker -n localhost:9876 &

3.創建Topic

此處通過命令行創建Topic

sh mqadmin updateTopic -b localhost:10911 -t topicTest1 -n localhost:9876

說明:-b broker_id:broker_port。 broker_id是啓動Broker的機器的ip,broker_port默認是10911

-t topicName 

-n nameServerIp:nameServer_port  Name Server的IP和端口

4.發送topic消息-producer

 @Test
    public void test27() throws MQClientException, UnsupportedEncodingException, RemotingException, InterruptedException, MQBrokerException {
        DefaultMQProducer producer=new DefaultMQProducer("group_1");
        producer.setNamesrvAddr("localhost:9876");
        producer.start();

        for (int i=0;i<100;i++){
            Message message=new Message(
                    "topicTest1","TagA",
                    ("Hello RocketMq"+i).getBytes(RemotingHelper.DEFAULT_CHARSET)
            );
            SendResult result =producer.send(message);
            System.out.printf("%s%n", result);
        }
        producer.shutdown();

    }

結果:

 

3.關閉服務

3.1關閉Broker

sh bin/mqshutdown broker

3.2關閉Name Server

sh mqshutdown broker

5.接收消息-consumer 

DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("consumerGroup_2");
        consumer.setNamesrvAddr("localhost:9876");
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        consumer.setMessageModel(MessageModel.BROADCASTING);
        //訂閱topic爲topicTest1的消息
        consumer.subscribe("topicTest1","TagA");
        consumer.setInstanceName(UUID.randomUUID().toString());
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);

                for (MessageExt message:msgs){
                    System.out.println(new String(message.getBody()));

                }

                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        consumer.start();
        System.out.printf("Consumer Started.%n");

如果像上面這樣先運行producer發送topic再運行Consumer接收消息時，可以正常產生消息但是消費者無法消費消息，因爲我用的時push的消費方式，當然若用pull的消費模式的話時沒問題的，先那push模式來說。

push模式需要在消費者Consumer初始化完畢後在進行producer的消息發送纔可以正常消費。

如下:

@Test
    public void test32() throws MQClientException, UnsupportedEncodingException, RemotingException, InterruptedException, MQBrokerException {
       //生產者-start
        DefaultMQProducer producer=new DefaultMQProducer("group_2");
        producer.setNamesrvAddr("localhost:9876");
        producer.start();
        //生產者-end
//        消費者-start
        DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("consumerGroup_2");
        consumer.setNamesrvAddr("localhost:9876");
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        consumer.setMessageModel(MessageModel.BROADCASTING);
        consumer.subscribe("topicTest1","TagA");
        consumer.setInstanceName(UUID.randomUUID().toString());
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);

                for (MessageExt message:msgs){
                    System.out.println(new String(message.getBody()));

                }

                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        consumer.start();
        System.out.printf("Consumer Started.%n");

//        消費者-end


        for (int i=0;i<100;i++){
            Message message=new Message(
                    "topicTest2","TagA",
                    ("你好 RocketMq"+i).getBytes(RemotingHelper.DEFAULT_CHARSET)
            );
            SendResult result =producer.send(message);
            System.out.printf("%s%n", result);
        }
        producer.shutdown();
    }

此時，當producer產生消息時會自動觸發消費者的監聽器，可以進行消費。

以下時pull的消費模式的示例:

DefaultMQPullConsumer consumer = new DefaultMQPullConsumer("pullConsumer");
        consumer.setNamesrvAddr("localhost:9876");
        consumer.start();

        Set<MessageQueue> mqs = consumer.fetchSubscribeMessageQueues("topicTest2");


        for (MessageQueue mq : mqs) {
            // System.out.println("Consume from the queue: " + mq);
            System.out.println("當前獲取的消息的歸屬隊列是: " + mq.getQueueId());
            PullResultExt pullResult = (PullResultExt) consumer.pullBlockIfNotFound(mq, null,0, 10000);
            if (pullResult.getPullStatus().equals(PullStatus.FOUND)) {

                List<MessageExt> messageExtList = pullResult.getMsgFoundList();
                for (MessageExt m : messageExtList) {
                    System.out.println("收到了消息:" + new String(m.getBody()));
                }

            }
        }