目錄簡單使用Spring Cloud Stream 構(gòu)建基于RocketMQ的生產(chǎn)者和消費者生產(chǎn)者消費者Stream其他特性消息發(fā)送失敗的處理消費者錯誤處理

Spring Cloud Stream對Spring Cloud體系中的Mq進⾏了很好的上層抽象，可以讓我們與具體消息中間件解耦合，屏蔽掉了底層具體MQ消息中間件的細節(jié)差異，就像Hibernate屏蔽掉了具體數(shù)據(jù)庫（Mysql/Oracle⼀樣）。如此⼀來，我們學習、開發(fā)、維護MQ都會變得輕松。⽬前Spring Cloud Stream原生⽀持RabbitMQ和Kafka，阿里在這個基礎(chǔ)上提供了RocketMQ的支持

簡單使用Spring Cloud Stream 構(gòu)建基于RocketMQ的生產(chǎn)者和消費者生產(chǎn)者

pom文件中加入依賴

<dependencies><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency><dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-stream-rocketmq</artifactId> <version>2.1.0.RELEASE</version></dependency> </dependencies>

配置文件中增加關(guān)于Spring Cloud Stream binder和bindings的配置

spring: application: name: zhao-cloud-stream-producer cloud: stream: rocketmq:binder: name-server: 127.0.0.1:9876bindings: output: producer: group: test sync: true bindings:output: destination: stream-test-topic content-type: text/plain # 內(nèi)容格式。這里使用 JSON

其中destination代表生產(chǎn)的數(shù)據(jù)發(fā)送到的topic 然后定義一個channel用于數(shù)據(jù)發(fā)送

import org.springframework.cloud.stream.annotation.Output;import org.springframework.messaging.MessageChannel;public interface TestChannel { @Output('output') MessageChannel output();}

最后構(gòu)造數(shù)據(jù)發(fā)送的接口

@Controllerpublic class SendMessageController { @Resource private TestChannel testChannel; @ResponseBody @RequestMapping(value = 'send', method = RequestMethod.GET) public String sendMessage() {String messageId = UUID.randomUUID().toString();Message<String> message = MessageBuilder.withPayload('this is a test:' + messageId).setHeader(MessageConst.PROPERTY_TAGS, 'test').build();try { testChannel.output().send(message); return messageId + '發(fā)送成功';} catch (Exception e) { return messageId + '發(fā)送失敗，原因：' + e.getMessage();} }}消費者

消費者的pom引入與生產(chǎn)者相同，在此不再贅述，配置時需要將stream的output修改為input并修改對應屬性

spring: application: name: zhao-cloud-stream-consumer cloud: stream: rocketmq:binder: name-server: 127.0.0.1:9876bindings: input: consumer: tags: test bindings:input: destination: stream-test-topic content-type: text/plain # 內(nèi)容格式。這里使用 JSON group: test

另外關(guān)于channel的構(gòu)造也要做同樣的修改

import org.springframework.cloud.stream.annotation.Input;import org.springframework.messaging.SubscribableChannel;public interface TestChannel { @Input('input') SubscribableChannel input();}

最后我在啟動類中對收到的消息進行了監(jiān)聽

@StreamListener('input') public void receiveInput(@Payload Message message) throws ValidationException {System.out.println('input1 receive: ' + message.getPayload() + ', foo header: ' + message.getHeaders().get('foo')); }

測試結(jié)果

Stream其他特性消息發(fā)送失敗的處理

消息發(fā)送失敗后悔發(fā)送到默認的一個“topic.errors'的channel中(topic是配置的destination)。要配置消息發(fā)送失敗的處理，需要將錯誤消息的channel打開 消費者配置如下

spring: application: name: zhao-cloud-stream-producer cloud: stream: rocketmq:binder: name-server: 127.0.0.1:9876bindings: output: producer: group: test sync: true bindings:output: destination: stream-test-topic content-type: text/plain # 內(nèi)容格式。這里使用 JSON producer: errorChannelEnabled: true

在啟動類中配置錯誤消息的Channel信息

@Bean('stream-test-topic.errors') MessageChannel testoutPutErrorChannel(){return new PublishSubscribeChannel(); }

新建異常處理service

import org.springframework.integration.annotation.ServiceActivator;import org.springframework.messaging.Message;import org.springframework.stereotype.Service;@Servicepublic class ErrorProducerService { @ServiceActivator(inputChannel = 'stream-test-topic.errors') public void receiveProducerError(Message message){System.out.println('receive error msg :'+message); }}

當發(fā)生異常時，由于測試類中已經(jīng)將異常捕獲，處理發(fā)送異常主要是在這里進行。模擬，應用與rocketMq斷開的場景。可見

消費者錯誤處理

首先增加配置為

spring: application: name: zhao-cloud-stream-producer cloud: stream: rocketmq:binder: name-server: 127.0.0.1:9876bindings: output: producer: group: test sync: true bindings:output: destination: stream-test-topic content-type: text/plain # 內(nèi)容格式。這里使用 JSON producer: errorChannelEnabled: true

增加相應的模擬異常的操作

@StreamListener('input') public void receiveInput(@Payload Message message) throws ValidationException {//System.out.println('input1 receive: ' + message.getPayload() + ', foo header: ' + message.getHeaders().get('foo'));throw new RuntimeException('oops'); } @ServiceActivator(inputChannel = 'stream-test-topic.test.errors') public void receiveConsumeError(Message message){System.out.println('receive error msg'+message.getPayload()); }

代碼地址https://github.com/zhendiao/deme-code/tree/main/zp

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