@Transactional 和 @Retryable 的问题

Question

如果我从 spring-retry 库中添加 @Retryable，我将无法在事务中执行数据库操作。这是我的代码结构的样子：

    public class ExpireAndSaveTrades {
    @Transactional(rollbackFor = MyException.class)
    public void expireAndSaveTrades(List<Trade> trades) {
        try {
            // these two MUST be executed in one transaction
            trades.forEach(trade -> dao.expireTrades(trade));
            dao.saveTrades(trades);
        } catch (Exception e) {
            throw new MyException(e.getMessage(), e);
        }
    }
}

public class Dao {
    @Retryable(value = CannotAcquireLockException.class,
            maxAttempts = 3,
            stateful = true,
            backoff = @Backoff(delay = 300, multiplier = 3))
    public void expireTrades(Trade trade) {
    try {
          tradeRepository.expire(trade.getId(), trade.getNewStopDate());
    } catch (CannotAcquireLockException e) {
          expireTrade(trade);
        }

    }

    @Retryable(value = CannotAcquireLockException.class,
            maxAttempts = 3,
            stateful = true,
            backoff = @Backoff(delay = 300, multiplier = 3))
    public void saveTrades(List<Trades> trades) {
    try {
          tradeRepository.saveAll(trades)
    } catch (CannotAcquireLockException e) {
              saveTrades(trades);
            }
    }
}

public interface TradeRepository extends JpaRepository<Trade, Integer> {
    @Modifying
    @Query(value = "update trade set stop_date=:new_stop_date where id=:id", nativeQuery = true)
    void expire(@Param("id") int id, @Param("new_stop_date") String newStopDate);
}

所以这就是我现在的位置：

1. 不使用有状态（即有状态默认设置为false） - 重试成功，但在它结束时，我看到这个异常：org.springframework.transaction.UnexpectedRollbackException: Transaction silently rolled back because it has been marked as rollback-only 并且多次重试后更新/保存的数据是在数据库表中回滚
2. stateful = true - 不再发生重试

我浏览了许多 SO 帖子和博客，但找不到解决问题的方法。有人可以帮帮我吗？

编辑： 更新了我的问题以添加 try-catch 块这样，spring-retry 不会启动（我知道，因为我添加了一个侦听器到 @Retryable 以记录 retryContext .我没有看到日志被打印出来。如果有一个CannotAcquireLockException，事务也会默默地回滚

@Override
    public <T, E extends Throwable> void onError(RetryContext context, RetryCallback<T, E> callback, Throwable throwable) {
        LOGGER.info("Retry Context - {}", context);
    }

Answer 1

您正在事务中进行重试；这是错误的，会产生您所看到的结果；您需要交换它并在重试中执行事务。这就是为什么在不使用有状态时会出现回滚错误的原因。

如果使用有状态重试，@Retryable 所做的只是保持状态；重试对象的调用者必须继续调用，直到成功或重试耗尽。

编辑

这里是一个使用有状态重试的例子

@Component
class ServiceCaller {

    @Autowired
    Service service;

    public void call() {
        try {
            this.service.process();
        }
        catch (IllegalStateException e) {
            System.out.println("retrying...");
            call();
        }
        catch (RuntimeException e) {
            throw e;
        }
    }

}

@Component
class Service {

    @Autowired
    Retryer retryable;

    @Transactional
    public void process() {
        retryable.invoke();
    }

}

@Component
class Retryer {

    @Retryable(maxAttempts = 3, stateful = true)
    public void invoke() {
        System.out.println("Invoked");
        throw new IllegalStateException("failed");
    }

    @Recover
    public void recover(IllegalStateException e) {
        System.out.println("Retries exhausted");
        throw new RuntimeException(e);
    }

}

Invoked
retrying...
Invoked
retrying...
Invoked
retrying...
Retries exhausted
...
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: failed
    at com.example.demo.Retryer.recover(So67197577Application.java:84) ~[classes/:na]
...
Caused by: java.lang.IllegalStateException: failed

而且，没有@Recover 方法...

Invoked
retrying...
Invoked
retrying...
Invoked
retrying...
...
Caused by: org.springframework.retry.ExhaustedRetryException: Retry exhausted after last attempt with no recovery path; nested exception is java.lang.IllegalStateException: failed