SpringCloud微服务开发基于RocketMQ实现分布式事务管理详解

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-spring-boot-starter</artifactId>
</dependency>

/**
 * 根据订单号删除订单
 * @param orderNo 订单编号
 */
@PostMapping("/order/delete")
public ResultData<String> delete(@RequestParam String orderNo){
 log.info("delete order id is {}",orderNo);
 orderService.delete(orderNo);
 return ResultData.success("订单删除成功");
}

@Override
public void delete(String orderNo) {
 Order order = orderMapper.selectByNo(orderNo);
 //如果订单存在且状态为有效，进行业务处理
 if (order != null && CloudConstant.VALID_STATUS.equals(order.getStatus())) {
  String transactionId = UUID.randomUUID().toString();
  //如果可以删除订单则发送消息给rocketmq，让用户中心消费消息
  rocketMQTemplate.sendMessageInTransaction("add-amount",
    MessageBuilder.withPayload(
      UserAddMoneyDTO.builder()
        .userCode(order.getAccountCode())
        .amount(order.getAmount())
        .build()
    )
    .setHeader(RocketMQHeaders.TRANSACTION_ID, transactionId)
    .setHeader("order_id",order.getId())
    .build()
    ,order
  );
 
 }
}

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class UserAddMoneyDTO {
    /**
     * 用户编码
     */
    private String userCode;
    /**
     * 金额
     */
    private BigDecimal amount;
}

/**
 * 监听事务消息
 * @author javadaily
 */
@Slf4j
@RocketMQTransactionListener
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class AddUserAmountListener implements RocketMQLocalTransactionListener {
    private final OrderService orderService;
    private final RocketMqTransactionLogMapper rocketMqTransactionLogMapper;
    /**
     * 执行本地事务
     */
    @Override
    public RocketMQLocalTransactionState executeLocalTransaction(Message message, Object arg) {
        log.info("执行本地事务");
        MessageHeaders headers = message.getHeaders();
        //获取事务ID
        String transactionId = (String) headers.get(RocketMQHeaders.TRANSACTION_ID);
        Integer orderId = Integer.valueOf((String)headers.get("order_id"));
        log.info("transactionId is {}, orderId is {}",transactionId,orderId);
        try{
            //执行本地事务，并记录日志
            orderService.changeStatuswithRocketMqLog(orderId, CloudConstant.INVALID_STATUS,transactionId);
            //执行成功，可以提交事务
            return RocketMQLocalTransactionState.COMMIT;
        }catch (Exception e){
            return RocketMQLocalTransactionState.ROLLBACK;
        }
    }
    /**
     * 本地事务的检查，检查本地事务是否成功
     */
    @Override
    public RocketMQLocalTransactionState checkLocalTransaction(Message message) {
        MessageHeaders headers = message.getHeaders();
        //获取事务ID
        String transactionId = (String) headers.get(RocketMQHeaders.TRANSACTION_ID);
        log.info("检查本地事务,事务ID:{}",transactionId);
        //根据事务id从日志表检索
        QueryWrapper<RocketmqTransactionLog> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("transaction_id",transactionId);
        RocketmqTransactionLog rocketmqTransactionLog = rocketMqTransactionLogMapper.selectOne(queryWrapper);
        if(null != rocketmqTransactionLog){
            return RocketMQLocalTransactionState.COMMIT;
        }
        return RocketMQLocalTransactionState.ROLLBACK;
    }
}

@Transactional(rollbackFor = RuntimeException.class)
@Override
public void changeStatuswithRocketMqLog(Integer id,String status,String transactionId){
    orderMapper.changeStatus(id,status);
    rocketMqTransactionLogMapper.insert(
        RocketmqTransactionLog.builder()
        .transactionId(transactionId)
        .log("执行删除订单操作")
        .build()
    );
}

@Slf4j
@Service
@RocketMQMessageListener(topic = "add-amount",consumerGroup = "cloud-group")
@RequiredArgsConstructor(onConstructor = @__(@Autowired) )
public class AddUserAmountListener implements RocketMQListener<UserAddMoneyDTO> {
    private final AccountMapper accountMapper;
    /**
     * 收到消息的业务逻辑
     */
    @Override
    public void onMessage(UserAddMoneyDTO userAddMoneyDTO) {
        log.info("received message: {}",userAddMoneyDTO);
        accountMapper.increaseAmount(userAddMoneyDTO.getUserCode(),userAddMoneyDTO.getAmount());
        log.info("add money success");
    }
}