1 代码实现

1.1 正常情况

我们采用手动开启事务的方式

    public void add(CountDownLatch countDownLatch) {
        executor.submit(() -> {
                TransactionStatus transaction = dataSourceTransactionManager.getTransaction(transactionDefinition);
                try {
                    ThreadTest obj = new ThreadTest();
                    obj.setColumnName("threadTest");
                    log.info("开始插入");
                    threadTestMapper.insert(obj);
                    countDownLatch.countDown();
                    // throw new RuntimeException("故意抛出错误测试是否会进行回滚");
                } catch (Exception e) {
                    log.info("出现异常了开始回滚");
                    dataSourceTransactionManager.rollback(transaction);
                } finally {
                    dataSourceTransactionManager.commit(transaction);
                }
            });
    }

insert方法中插入100条测试数据到数据库，通过手动开启事务的方式在每个子线程中开启各自的事务。注意注释的位置，首先测试没有错误的情况。

完整代码

@Service
@RequiredArgsConstructor
@Slf4j
public class ThreadTestServiceImplTwo extends ServiceImpl<ThreadTestMapper, ThreadTest>
    implements ThreadTestService{

    private final DataSourceTransactionManager dataSourceTransactionManager;
    private final TransactionDefinition transactionDefinition;
    private final ThreadTestMapper threadTestMapper;

    private
    static final ThreadPoolTaskExecutor executor;
    static {
        executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(10);
        executor.setMaxPoolSize(15);
        executor.setQueueCapacity(100);
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.setKeepAliveSeconds(60);
        executor.initialize();
    }

    public void add(CountDownLatch countDownLatch) {
        executor.submit(() -> {
                TransactionStatus transaction = dataSourceTransactionManager.getTransaction(transactionDefinition);
                try {
                    ThreadTest obj = new ThreadTest();
                    obj.setColumnName("threadTest");
                    log.info("开始插入");
                    threadTestMapper.insert(obj);
                    countDownLatch.countDown();
                    // throw new RuntimeException("故意抛出错误测试是否会进行回滚");
                } catch (Exception e) {
                    log.info("出现异常了开始回滚");
                    dataSourceTransactionManager.rollback(transaction);
                } finally {
                    dataSourceTransactionManager.commit(transaction);
                }
            });
    }

    public void insert() {
        CountDownLatch countDownLatch = new CountDownLatch(100);
        for (int i = 0; i < 100; i++) {
            add(countDownLatch);
        }
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}

测试类中测试insert方法

    @Test
    void testInsert() {
        threadTestService.insert();
    }

结果
正常插入100条数据

1.2 异常情况

把1.1中的方法 // throw new RuntimeException("故意抛出错误测试是否会进行回滚");取消注释即可，测试手动错误数据插入情况

   public void insert() {
        CountDownLatch countDownLatch = new CountDownLatch(100);
        for (int i = 0; i < 100; i++) {
            add(countDownLatch);
        }
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
    public void add(CountDownLatch countDownLatch) {
        executor.submit(() -> {
                TransactionStatus transaction = dataSourceTransactionManager.getTransaction(transactionDefinition);
                try {
                    ThreadTest obj = new ThreadTest();
                    obj.setColumnName("threadTest");
                    log.info("开始插入");
                    threadTestMapper.insert(obj);
                    countDownLatch.countDown();
                    // 手动错误
                    throw new RuntimeException("故意抛出错误测试是否会进行回滚");
                } catch (Exception e) {
                    log.info("出现异常了开始回滚");
                    dataSourceTransactionManager.rollback(transaction);
                } finally {
                    dataSourceTransactionManager.commit(transaction);
                }
            });
    }

结果
可以看到线程发生错误(截图为部分线程)开始回滚数据

数据库理所当然没有数据，完成了事务的控制

总结

难道我们真的控制了多线程的事务吗？
上面测试的仅仅是所有的线程各自发生了错误，并且各自线程完成了自己线程事务的回滚，假设某一个线程没有错误，某个线程有错误，如何回滚所有线程事务呢？是不是和分布式事务有点类似了呢？所以通过上述方法是没有办法处理部分错误部分正确的情况！