分布式事务-学习

凤玉写了一个分布式事务方案，做一个记录。
wiki：

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ppt：

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     /**
     * 提交分布式事务
     */
    public void commit(CommitReq req) throws BusinessException, ConcurrentWriteException {
        List<AssetTrans> transPOs = assetTransDao.getByTransId(req.getMemberId(), req.getTransId());
        if (transPOs.size() == 0) {
            return;
        }
         // 删除事务记录
        // 并发删除的时候,先执行删除操作的事务T1未结束的情况下,后执行删除操作的事务T2会阻塞,如果T1提交事务成功了,则T2 deleteByTransId会返回0
        int result = assetTransDao.deleteByTransId(req.getMemberId(), req.getTransId());
        if (result == 0) {
            return;
        }
          ...
          //根据类型进行操作
}

    /**
     * 回滚分布式事务
     */
    public void rollback(RollbackReq req) throws BusinessException, ConcurrentWriteException {
        List<AssetTrans> transPOs = assetTransDao.getByTransId(req.getMemberId(), req.getTransId());
        if (transPOs.size() == 0) {
            return;
        }

        // 删除事务记录
        int result = assetTransDao.deleteByTransId(req.getMemberId(), req.getTransId());
        if (result == 0) {
            return;
        }
      for (AssetTrans transPO : transPOs) {
            // 添加积分操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.ADD_MEMBER_POINT.getValue())) {
                // do nothing
            }

            // 消费积分操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.PAY_MEMBER_POINT.getValue())) {
                PayMemberPointTransData transData = FastJsonUtils.parse(transPO.data, PayMemberPointTransData.class);
                pointService.rollbackPayMemberPoint(transData);
            }

            // 取消添加积分操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.CANCEL_ADD_POINT.getValue())) {
                CancelPointAddTransData transData = FastJsonUtils.parse(transPO.data, CancelPointAddTransData.class);
                pointService.rollbackCancelAddPoint(transData);
            }

            //取消撤销消费积分操作
            if (transPO.getProcessType().equals(AssetProcessType.CANCEL_PAY_POINT.getValue())) {
                // do nothing
            }

            //添加储值回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.ADD_MEMBER_BALANCE.getValue())) {
                //do nothing
            }

            //消费储值操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.PAY_MEMBER_BALANCE.getValue())) {
                PayMemberBalanceTransData transData = FastJsonUtils.parse(transPO.getData(), PayMemberBalanceTransData.class);
                balanceService.rollbackPayMemberBalance(transData);
            }

            //取消增加储值操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.CANCEL_ADD_BALANCE.getValue())) {
                CancelAddBalanceTransData transData = FastJsonUtils.parse(transPO.getData(), CancelAddBalanceTransData.class);
                balanceService.rollbackCancelAddBalance(transData);
            }

            //取消消费储值操作回滚事务
            if (transPO.getProcessType().equals(AssetProcessType.CANCEL_PAY_BALANCE.getValue())) {
                //do nothing
            }
        }
    }
}