SpringBoot多线程事务回滚 

  1     public String test() {
  2         String result = "";
  3         CountDownLatch rollBackLatch = new CountDownLatch(1);
  4         CountDownLatch mainThreadLatch = new CountDownLatch(2);
  5         AtomicBoolean rollbackFlag = new AtomicBoolean(false);
  6         List<Future<String>> list = new ArrayList<Future<String>>();
  7         // 线程有返回值
  8         Future<String> future = executor1(rollBackLatch, mainThreadLatch, rollbackFlag);
  9         list.add(future);
 10         // 线程无返回值
 11         executor2(rollBackLatch, mainThreadLatch, rollbackFlag);
 12         // 主线程业务执行完毕 如果其他线程也执行完毕 且没有报异常 正在阻塞状态中 唤醒其他线程 提交所有的事务
 13         // 如果其他线程或者主线程报错 则不会进入if 会触发回滚
 14         if (!rollbackFlag.get()) {
 15             try {
 16                 mainThreadLatch.await();
 17                 rollBackLatch.countDown();
 18                 for (Future<String> f : list)
 19                     if (!"success".equals(f.get()))
 20                         result = f.get() + "。";
 21             } catch (InterruptedException | ExecutionException e) {
 22                 e.printStackTrace();
 23             }
 24         }
 25         return result;
 26     }
 27 
 28     @Autowired
 29     private PlatformTransactionManager transactionManager;
 30 
 31     public Future<String> executor1(CountDownLatch rollBackLatch, CountDownLatch mainThreadLatch,
 32             AtomicBoolean rollbackFlag) {
 33         ExecutorService executor = Executors.newCachedThreadPool();
 34         Future<String> result = executor.submit(new Callable<String>() {
 35 
 36             @Override
 37             public String call() throws Exception {
 38                 if (rollbackFlag.get())
 39                     return "error"; // 如果其他线程已经报错 就停止线程
 40                 // 设置一个事务
 41                 DefaultTransactionDefinition def = new DefaultTransactionDefinition();
 42                 def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW); // 事物隔离级别，开启新事务，这样会比较安全些。
 43                 TransactionStatus status = transactionManager.getTransaction(def); // 获得事务状态
 44                 try {
 45                     // 业务处理开始
 46                     // ..............
 47                     // 业务处理结束
 48                     mainThreadLatch.countDown();
 49                     rollBackLatch.await();// 线程等待
 50                     if (rollbackFlag.get()) {
 51                         transactionManager.rollback(status);
 52                     } else {
 53                         transactionManager.commit(status);
 54                     }
 55                     return "success";
 56                 } catch (Exception e) {
 57                     e.printStackTrace();
 58                     // 如果出错了 就放开锁 让别的线程进入提交/回滚 本线程进行回滚
 59                     rollbackFlag.set(true);
 60                     rollBackLatch.countDown();
 61                     mainThreadLatch.countDown();
 62                     transactionManager.rollback(status);
 63                     return "操作失败：" + e.getMessage();
 64                 }
 65             }
 66 
 67         });
 68         // result.get()阻塞线程
 69         return result;
 70     }
 71 
 72     public void executor2(CountDownLatch rollBackLatch, CountDownLatch mainThreadLatch, AtomicBoolean rollbackFlag) {
 73         ExecutorService executorService = Executors.newCachedThreadPool();
 74         executorService.execute(new Runnable() {
 75 
 76             @Override
 77             public void run() {
 78                 if (rollbackFlag.get())
 79                     return; // 如果其他线程已经报错 就停止线程
 80                 // 设置一个事务
 81                 DefaultTransactionDefinition def = new DefaultTransactionDefinition();
 82                 def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW); // 事物隔离级别，开启新事务，这样会比较安全些。
 83                 TransactionStatus status = transactionManager.getTransaction(def); // 获得事务状态
 84                 try {
 85                     // 业务处理开始
 86                     // .....
 87                     // 业务处理结束
 88                     mainThreadLatch.countDown();
 89                     rollBackLatch.await();// 线程等待
 90                     if (rollbackFlag.get()) {
 91                         transactionManager.rollback(status);
 92                     } else {
 93                         transactionManager.commit(status);
 94                     }
 95                 } catch (Exception e) {
 96                     e.printStackTrace();
 97                     // 如果出错了 就放开锁 让别的线程进入提交/回滚 本线程进行回滚
 98                     rollbackFlag.set(true);
 99                     rollBackLatch.countDown();
100                     mainThreadLatch.countDown();
101                     transactionManager.rollback(status);
102                 }
103             }
104         });
105     }

 

posted @ 2020-11-09 17:13  天冷吃冰棍儿  阅读(7229)  评论(0)    收藏  举报