spring集成RocketMQ異步消費,

spring 集成RocketMQ異步消費

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幫助別人的同時更是豐富自己的良機。

工作需要採用異步消費來實現生產者/消費者解耦：
方案1：採用傳統schedule實現
方案2：使用RocketMQ實現
由於業務需要保證消費實時性，最終我們選擇了本章知識RocketMQ

一.引入依賴

<dependency>
     <groupId>org.apache.rocketmq</groupId>
     <artifactId>rocketmq-client</artifactId>    
     <version>4.7.0</version>
</dependency>

二.mq.properties配置

rocketmq.consumerGroup=thConsumerGroup
rocketmq.namesrvAddr=ip1:port1;ip2:port2
rocketmq.topicTag=TAG1
rocketmq.topic=TestTopic1
#消費模式
rocketmq.consumeFromWhere=CONSUME_FROM_LAST_OFFSET
#傳播行爲
rocketmq.messageModel=CLUSTERING

三.創建topic命令

目錄:rocketmq/bin
sh mqadmin updateTopic -n ip1:port1 -b ip2:port2-t TestTopic1

四.生產者

private final Log logger = LogFactory.getLog(getClass());
	 
    @Value("${rocketmq.namesrvAddr}")
	private String namesrvAddr;
	@Value("${rocketmq.consumerGroup}")
	private String consumerGroup;
	@Value("${rocketmq.topic}")
	private String topic;
	@Value("${rocketmq.topicTag}")
	private String topicTag;
	
	public void sendFileToMq(String fileid) throws IOException {
		DefaultMQProducer producer = new DefaultMQProducer(consumerGroup);
	    producer.setNamesrvAddr(namesrvAddr);
	    producer.setVipChannelEnabled(true);
	    producer.setInstanceName(fileid);
	    SendResult sendResult;
		try {
			producer.start();
			Message msg = new Message(topic, topicTag, fileid, fileid.getBytes());
			sendResult = producer.send(msg);
			logger.info("消息內容:=="+sendResult);
		    logger.info("消息狀態:=="+sendResult.getSendStatus());
		    logger.info("======:"+SendStatus.SEND_OK);
		    if((sendResult == null) || (sendResult.getSendStatus() != SendStatus.SEND_OK)){
		    	logger.info("=====消息發送失敗:"+sendResult.getSendStatus());
		    	return;
		    }
		} catch (MQClientException e) {
			e.printStackTrace();
			logger.error("================MQ連接異常===================");
		} catch (RemotingException e) {
			e.printStackTrace();
		} catch (MQBrokerException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

創建了一個DefaultMQProducer對象，同時設置了GroupName和NameServer地址，然後創建消息消息通過DefaultMQProducer將消息發送出去，返回一個SendResult對象；

五.消費者自動監聽隊列

@Component
public class RocketMQConsumer {
	
	private final Log logger = LogFactory.getLog(getClass());

	@Value("${rocketmq.namesrvAddr}")
	private String namesrvAddr;
	@Value("${rocketmq.consumerGroup}")
	private String consumerGroup;
	@Value("${rocketmq.topic}")
	private String topic;
	@Value("${rocketmq.topicTag}")
	private String topicTag;
	@Value("${rocketmq.consumeFromWhere}")
	private String consumeFromWhere;
	@Value("${rocketmq.messageModel}")
	private String messageModel;
	
	@Bean
	public DefaultMQPushConsumer getRocketMQConsumer() throws MQClientException {
		logger.info("======rocketmq  start======");
		DefaultMQPushConsumer defaultMQPushConsumer = new DefaultMQPushConsumer(consumerGroup);
		defaultMQPushConsumer.setNamesrvAddr(namesrvAddr);
		defaultMQPushConsumer.setInstanceName(String.valueOf(System.currentTimeMillis()));
		if ("CONSUME_FROM_FIRST_OFFSET".equals(consumeFromWhere)) { //從頭到尾消費
			defaultMQPushConsumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET); 
		} else if ("CONSUME_FROM_LAST_OFFSET".equals(consumeFromWhere)) { //從尾部開始消費
			defaultMQPushConsumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);
		} else if ("CONSUME_FROM_TIMESTAMP".equals(consumeFromWhere)) { //指定時間消費
			defaultMQPushConsumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_TIMESTAMP);
		} else {
			defaultMQPushConsumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
		}
		// 訂閱主題和 標籤（ * 代表所有標籤)下信息
		defaultMQPushConsumer.subscribe(topic, topicTag);
		if (messageModel == null) {
			defaultMQPushConsumer.setMessageModel(MessageModel.CLUSTERING);
		}else if ("CLUSTERING".equals(messageModel)){  //集羣模式
			defaultMQPushConsumer.setMessageModel(MessageModel.CLUSTERING);
		}else if ("BROADCASTING".equals(messageModel)){  //廣播
			defaultMQPushConsumer.setMessageModel(MessageModel.BROADCASTING);
		}else {
			defaultMQPushConsumer.setMessageModel(MessageModel.CLUSTERING);
		}
		//註冊消費的監聽 並在此監聽中消費信息，並返回消費的狀態信息
		defaultMQPushConsumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> {
			// msgs中只收集同一個topic，同一個tag，並且key相同的message
			// 會把不同的消息分別放置到不同的隊列中
			try {
				for (Message msg : msgs) {
					// 消費者獲取消息 這裏只輸出 不做後面邏輯處理
					String body = new String(msg.getBody(), "utf-8");
					logger.info("==========mq參數=========="+body);
			
				}
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
				return ConsumeConcurrentlyStatus.RECONSUME_LATER;
			}
			return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
		});
		defaultMQPushConsumer.start();
		logger.info("consumerGroup:" + consumerGroup + " namesrvAddr:" + namesrvAddr + "  start success!");
		return defaultMQPushConsumer;
	}