RocketMQ入門實例

RocketMQ入門實例

RocketMQ官網：http://rocketmq.apache.org

1. 從RocketMQ官網下載rocketmq，解壓到/usr/local/rocketmq-all-4.4.0目錄。

2. 啓動NameServer

   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ nohup sh bin/mqnamesrv &
   [1] 4888
   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ nohup: 忽略輸入並把輸出追加到'nohup.out'
   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ tail -f ~/logs/rocketmqlogs/namesrv.log 
   2019-11-09 16:04:15 INFO main - tls.client.keyPath = null
   2019-11-09 16:04:15 INFO main - tls.client.keyPassword = null
   2019-11-09 16:04:15 INFO main - tls.client.certPath = null
   2019-11-09 16:04:15 INFO main - tls.client.authServer = false
   2019-11-09 16:04:15 INFO main - tls.client.trustCertPath = null
   2019-11-09 16:04:16 INFO main - Using OpenSSL provider
   2019-11-09 16:04:16 INFO main - SSLContext created for server
   2019-11-09 16:04:16 INFO NettyEventExecutor - NettyEventExecutor service started
   2019-11-09 16:04:16 INFO FileWatchService - FileWatchService service started
   2019-11-09 16:04:16 INFO main - The Name Server boot success. serializeType=JSON
   

3. 啓動Broker

   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ nohup sh bin/mqbroker -n localhost:9876 &
   [2] 6029
   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ nohup: 忽略輸入並把輸出追加到'nohup.out'
   adam@adam-G3-3579:/usr/local/rocketmq-all-4.4.0$ tail -f ~/logs/rocketmqlogs/broker.log 
   2019-11-09 16:05:55 WARN main - Load default discard message hook service: DefaultTransactionalMessageCheckListener
   2019-11-09 16:05:55 INFO main - The broker dose not enable acl
   2019-11-09 16:05:55 INFO FileWatchService - FileWatchService service started
   2019-11-09 16:05:55 INFO PullRequestHoldService - PullRequestHoldService service started
   2019-11-09 16:05:55 INFO brokerOutApi_thread_1 - register broker to name server localhost:9876 OK
   2019-11-09 16:05:55 INFO main - Start transaction service!
   2019-11-09 16:05:55 INFO main - The broker[adam-G3-3579, 192.168.0.105:10911] boot success. serializeType=JSON and name server is localhost:9876
   2019-11-09 16:06:05 INFO BrokerControllerScheduledThread1 - dispatch behind commit log 0 bytes
   2019-11-09 16:06:05 INFO BrokerControllerScheduledThread1 - Slave fall behind master: 185493 bytes
   2019-11-09 16:06:05 INFO brokerOutApi_thread_2 - register broker to name server localhost:9876 OK
   

4. 在spring項目中引入依賴

           <dependency>
               <groupId>org.apache.rocketmq</groupId>
               <artifactId>rocketmq-client</artifactId>
               <version>4.4.0</version>
           </dependency>
   

5. 編寫代碼

   RocketmqProducer.java

   @Component
   @Slf4j
   public class RocketMqProducer {
   
       private DefaultMQProducer producer = new DefaultMQProducer("producer_group");
       {
           producer.setNamesrvAddr("localhost:9876");
           try {
               producer.start();
           } catch (MQClientException e) {
               log.error("producer start error", e);
           }
       }
   
       public boolean sendMessageByTopicTagContent(String topic, String tag, String message) {
           log.info("sendMessageByTopicTagContent(topic={}, tag={}, message={})", topic, tag, message);
           try {
               Message msg =new Message(topic, tag, message.getBytes(RemotingHelper.DEFAULT_CHARSET));
               SendResult sendResult = producer.send(msg);
               log.info("sendResult={}", sendResult);
           } catch (MQClientException e) {
               e.printStackTrace();
           } catch (RemotingException e) {
               e.printStackTrace();
           } catch (MQBrokerException e) {
               e.printStackTrace();
           } catch (InterruptedException e) {
               e.printStackTrace();
           } catch (UnsupportedEncodingException e) {
               e.printStackTrace();
           }
           log.info("sendMessageByTopicTagContent(topic={}, tag={}, message={})", topic, tag, message);
           return true;
       }
   
   }
   

   RocketmqConsumer.java

   @Component
   @Slf4j
   public class RocketMqConsumer {
   
       private DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("producer_group");
       {
           consumer.setNamesrvAddr("localhost:9876");
           try {
               consumer.subscribe("topicA","*");
               consumer.registerMessageListener(new MessageListenerConcurrently() {
                   @Override
                   public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                       log.info("Thread[{}] receive message [{}]", Thread.currentThread().getName(), msgs);
                       return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                   }
               });
               consumer.start();
           } catch (MQClientException e) {
               log.error("訂閱失敗", e);
           }
       }
   
   }
   

   RocketmqController.java

   @RestController
   @RequestMapping("/mq")
   public class RocketMqController {
   
       @Autowired
       private RocketMqProducer rocketMqProducer;
       @Autowired
       private RocketMqConsumer rocketMqConsumer;
   
       @RequestMapping(value = "/produce", method = RequestMethod.GET)
       public JSONObject produce(@RequestParam String topic) {
           rocketMqProducer.sendMessageByTopicTagContent(topic, "1234", "Hello world");  //topic tag msg
           return new JSONObject();
       }
   
   }
   

6. 啓動項目，訪問localhost:8080/spring/mq/produce?topic=topicA,

   可以看到控制檯上輸出日誌，producer發送了消息並且consumer成功的接收到了。

   16:12:35.708 [http-nio-8080-exec-7] INFO root.rocketmq.RocketMqProducer - sendMessageByTopicTagContent(topic=topicA, tag=1234, message=Hello world)
   16:12:35.901 [http-nio-8080-exec-7] INFO root.rocketmq.RocketMqProducer - sendResult=SendResult [sendStatus=SEND_OK, msgId=C0A8006926966983F2A02CAD50350000, offsetMsgId=C0A8006900002A9F000000000002D495, messageQueue=MessageQueue [topic=topicA, brokerName=adam-G3-3579, queueId=3], queueOffset=7]
   16:12:35.902 [http-nio-8080-exec-7] INFO root.rocketmq.RocketMqProducer - sendMessageByTopicTagContent(topic=topicA, tag=1234, message=Hello world)
   16:12:36.344 [ConsumeMessageThread_1] INFO root.rocketmq.RocketMqConsumer - Thread[ConsumeMessageThread_1] receive message [[MessageExt [queueId=3, storeSize=170, queueOffset=7, sysFlag=0, bornTimestamp=1573287155766, bornHost=/192.168.0.105:39590, storeTimestamp=1573287155770, storeHost=/192.168.0.105:10911, msgId=C0A8006900002A9F000000000002D495, commitLogOffset=185493, bodyCRC=198614610, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message{topic='topicA', flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=8, CONSUME_START_TIME=1573287156344, UNIQ_KEY=C0A8006926966983F2A02CAD50350000, WAIT=true, TAGS=1234}, body=[72, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100], transactionId='null'}]]]
   

7. 關閉RocketMQ

sh bin/mqshutdown broker
sh bin/mqshutdown namesrv

記錄一個坑：直接下載release包然後啓動mq的話，可能會卡死。我的筆記本內存8g，在啓動Broker的時候就直接卡死了，後來試了幾次發現默認的jvm參數都很大，堆區namesrv是4g，broker是8g，所以超過了可用內存直接卡死了。所以一定記得要修改相應配置，避免跳坑。