目錄1 執(zhí)行流程2 工程2.1 pom2.2 application.yml2.3 TransactionListenerImpl2.4 SpringTransactionProducer2.5 SpringTxConsumer2.6 ProducerController2.7 RocketApplication3 測試3.1 正常消費測試3.2 回查代碼測試1 執(zhí)行流程

(1) 發(fā)送方向 MQ 服務(wù)端發(fā)送消息。(2) MQ Server 將消息持久化成功之后，向發(fā)送方 ACK 確認消息已經(jīng)發(fā)送成功，此時消息為半消息。(3) 發(fā)送方開始執(zhí)行本地事務(wù)邏輯。(4) 發(fā)送方根據(jù)本地事務(wù)執(zhí)行結(jié)果向 MQ Server 提交二次確認（Commit 或是 Rollback），MQ Server 收到Commit 狀態(tài)則將半消息標(biāo)記為可投遞，訂閱方最終將收到該消息；MQ Server 收到 Rollback 狀態(tài)則刪除半消息，訂閱方將不會接受該消息。(5) 在斷網(wǎng)或者是應(yīng)用重啟的特殊情況下，上述步驟4提交的二次確認最終未到達 MQ Server，經(jīng)過固定時間后MQ Server 將對該消息發(fā)起消息回查。(6) 發(fā)送方收到消息回查后，需要檢查對應(yīng)消息的本地事務(wù)執(zhí)行的最終結(jié)果。(7) 發(fā)送方根據(jù)檢查得到的本地事務(wù)的最終狀態(tài)再次提交二次確認，MQ Server 仍按照步驟4對半消息進行操作。

2 工程

2.1 pom

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.0.RELEASE</version><relativePath/> <!-- lookup parent from repository --> </parent> <properties><java.version>1.8</java.version> </properties> <dependencies><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope></dependency><dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId></dependency><dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.71</version></dependency><dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-collections4</artifactId> <version>4.2</version></dependency><dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId></dependency><!-- https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-spring-boot-starter --><dependency> <groupId>org.apache.rocketmq</groupId> <artifactId>rocketmq-spring-boot-starter</artifactId> <version>2.0.1</version></dependency><dependency> <groupId>org.apache.rocketmq</groupId> <artifactId>rocketmq-client</artifactId> <version>4.3.2</version></dependency> </dependencies> <build><plugins> <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.3.0.RELEASE</version> </plugin> <plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration> <source>1.8</source> <target>1.8</target></configuration> </plugin></plugins> </build>2.2 application.yml

rocketmq: name-server: 192.168.38.50:9876 producer: group: transcation-group2.3 TransactionListenerImpl

@RocketMQTransactionListener(txProducerGroup = 'transaction-producer-group')@Slf4jpublic class TransactionListenerImpl implements RocketMQLocalTransactionListener { private static Map<String, RocketMQLocalTransactionState> STATE_MAP = new HashMap<>(); /** * 執(zhí)行業(yè)務(wù)邏輯 */ @Override public RocketMQLocalTransactionState executeLocalTransaction(Message message, Object o) {String transId = (String) message.getHeaders().get(RocketMQHeaders.TRANSACTION_ID);try { System.out.println('用戶A賬戶減500元.'); System.out.println('用戶B賬戶加500元.'); STATE_MAP.put(transId, RocketMQLocalTransactionState.COMMIT); return RocketMQLocalTransactionState.COMMIT;} catch (Exception e) { e.printStackTrace();}STATE_MAP.put(transId, RocketMQLocalTransactionState.ROLLBACK);return RocketMQLocalTransactionState.UNKNOWN; } /** * 回查 */ @Override public RocketMQLocalTransactionState checkLocalTransaction(Message message) {String transId = (String) message.getHeaders().get(RocketMQHeaders.TRANSACTION_ID);log.info('回查消息 -> transId ={} , state = {}', transId, STATE_MAP.get(transId));return STATE_MAP.get(transId); }}2.4 SpringTransactionProducer

@Component@Slf4jpublic class SpringTransactionProducer { @Autowired private RocketMQTemplate rocketMQTemplate; /** * 發(fā)送消息 * */ public void sendMsg(String topic, String msg) {Message<String> message = MessageBuilder.withPayload(msg).build();this.rocketMQTemplate.sendMessageInTransaction('transaction-producer-group', topic, message, null);log.info('發(fā)送成功'); }}2.5 SpringTxConsumer

@Component@RocketMQMessageListener(topic = 'pay_topic',consumerGroup = 'transaction-consumer-group',selectorExpression = '*')@Slf4jpublic class SpringTxConsumer implements RocketMQListener<String> { @Override public void onMessage(String msg) {log.info('接收到消息 -> {}', msg); }}2.6 ProducerController

@RestController@RequestMapping('/producer')public class ProducerController { @Autowired private SpringTransactionProducer springTransactionProducer; @GetMapping('/sendMsg') public String sendMsg() {springTransactionProducer.sendMsg('pay_topic', '用戶A賬戶減500元,用戶B賬戶加500元。');return '發(fā)送成功'; }}2.7 RocketApplication

@SpringBootApplicationpublic class RocketApplication { public static void main(String[] args) {SpringApplication.run(RocketApplication.class); }}3 測試3.1 正常消費測試

描述： 正常啟動及可。

3.2 回查代碼測試

描述： 執(zhí)行本地事務(wù)時添加異常，重啟測試，發(fā)現(xiàn)消費者沒有收到消息。

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