快捷導(dǎo)航

Java多線程事務(wù)回滾@Transactional失效處理方案

更新時(shí)間：2022年08月09日 14:12:51 作者：*黑桃~A*#丨???????

這篇文章主要介紹了Java多線程事務(wù)回滾@Transactional失效處理方案，文章圍繞主題展開(kāi)詳細(xì)的內(nèi)容介紹，具有一定的參考價(jià)值，需要的朋友可以參考一下

背景介紹

1，最近有一個(gè)大數(shù)據(jù)量插入的操作入庫(kù)的業(yè)務(wù)場(chǎng)景，需要先做一些其他修改操作，然后在執(zhí)行插入操作，由于插入數(shù)據(jù)可能會(huì)很多，用到多線程去拆分?jǐn)?shù)據(jù)并行處理來(lái)提高響應(yīng)時(shí)間，如果有一個(gè)線程執(zhí)行失敗，則全部回滾。

2，在spring中可以使用@Transactional注解去控制事務(wù)，使出現(xiàn)異常時(shí)會(huì)進(jìn)行回滾，在多線程中，這個(gè)注解則不會(huì)生效，如果主線程需要先執(zhí)行一些修改數(shù)據(jù)庫(kù)的操作，當(dāng)子線程在進(jìn)行處理出現(xiàn)異常時(shí)，主線程修改的數(shù)據(jù)則不會(huì)回滾，導(dǎo)致數(shù)據(jù)錯(cuò)誤。

3，下面用一個(gè)簡(jiǎn)單示例演示多線程事務(wù)。

公用的類和方法

示例事務(wù)不成功操作

/**
* 測(cè)試多線程事務(wù).
* @param employeeDOList
*/
@Override
@Transactional
public void saveThread(List<EmployeeDO> employeeDOList) {
try {
//先做刪除操作,如果子線程出現(xiàn)異常,此操作不會(huì)回滾
this.getBaseMapper().delete(null);
//獲取線程池
ExecutorService service = ExecutorConfig.getThreadPool();
//拆分?jǐn)?shù)據(jù),拆分5份
List<List<EmployeeDO>> lists=averageAssign(employeeDOList, 5);
//執(zhí)行的線程
Thread []threadArray = new Thread[lists.size()];
//監(jiān)控子線程執(zhí)行完畢,再執(zhí)行主線程,要不然會(huì)導(dǎo)致主線程關(guān)閉,子線程也會(huì)隨著關(guān)閉
CountDownLatch countDownLatch = new CountDownLatch(lists.size());
AtomicBoolean atomicBoolean = new AtomicBoolean(true);
for (int i =0;i<lists.size();i++){
if (i==lists.size()-1){
atomicBoolean.set(false);
}
List<EmployeeDO> list = lists.get(i);
threadArray[i] = new Thread(() -> {
try {
//最后一個(gè)線程拋出異常
if (!atomicBoolean.get()){
throw new ServiceException("001","出現(xiàn)異常");
}
//批量添加,mybatisPlus中自帶的batch方法
this.saveBatch(list);
}finally {
countDownLatch.countDown();
}

});
}
for (int i = 0; i <lists.size(); i++){
service.execute(threadArray[i]);
}
//當(dāng)子線程執(zhí)行完畢時(shí),主線程再往下執(zhí)行
countDownLatch.await();
System.out.println("添加完畢");
}catch (Exception e){
log.info("error",e);
throw new ServiceException("002","出現(xiàn)異常");
}finally {
connection.close();
}
}

數(shù)據(jù)庫(kù)中存在一條數(shù)據(jù)：

//測(cè)試用例
@RunWith(SpringRunner.class)
@SpringBootTest(classes = { ThreadTest01.class, MainApplication.class})
public class ThreadTest01 {

@Resource
private EmployeeBO employeeBO;

/**
* 測(cè)試多線程事務(wù).
* @throws InterruptedException
*/
@Test
public void MoreThreadTest2() throws InterruptedException {
int size = 10;
List<EmployeeDO> employeeDOList = new ArrayList<>(size);
for (int i = 0; i<size;i++){
EmployeeDO employeeDO = new EmployeeDO();
employeeDO.setEmployeeName("lol"+i);
employeeDO.setAge(18);
employeeDO.setGender(1);
employeeDO.setIdNumber(i+"XX");
employeeDO.setCreatTime(Calendar.getInstance().getTime());
employeeDOList.add(employeeDO);
}
try {
employeeBO.saveThread(employeeDOList);
System.out.println("添加成功");
}catch (Exception e){
e.printStackTrace();
}
}
}

測(cè)試結(jié)果：

可以發(fā)現(xiàn)子線程組執(zhí)行時(shí)，有一個(gè)線程執(zhí)行失敗，其他線程也會(huì)拋出異常，但是主線程中執(zhí)行的刪除操作，沒(méi)有回滾，@Transactional注解沒(méi)有生效。

使用sqlSession控制手動(dòng)提交事務(wù)

@Resource
SqlContext sqlContext;
/**
* 測(cè)試多線程事務(wù).
* @param employeeDOList
*/
@Override
public void saveThread(List<EmployeeDO> employeeDOList) throws SQLException {
// 獲取數(shù)據(jù)庫(kù)連接,獲取會(huì)話(內(nèi)部自有事務(wù))
SqlSession sqlSession = sqlContext.getSqlSession();
Connection connection = sqlSession.getConnection();
try {
// 設(shè)置手動(dòng)提交
connection.setAutoCommit(false);
//獲取mapper
EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);
//先做刪除操作
employeeMapper.delete(null);
//獲取執(zhí)行器
ExecutorService service = ExecutorConfig.getThreadPool();
List<Callable<Integer>> callableList = new ArrayList<>();
//拆分list
List<List<EmployeeDO>> lists=averageAssign(employeeDOList, 5);
AtomicBoolean atomicBoolean = new AtomicBoolean(true);
for (int i =0;i<lists.size();i++){
if (i==lists.size()-1){
atomicBoolean.set(false);
}
List<EmployeeDO> list = lists.get(i);
//使用返回結(jié)果的callable去執(zhí)行,
Callable<Integer> callable = () -> {
//讓最后一個(gè)線程拋出異常
if (!atomicBoolean.get()){
throw new ServiceException("001","出現(xiàn)異常");
}
return employeeMapper.saveBatch(list);
};
callableList.add(callable);
}
//執(zhí)行子線程
List<Future<Integer>> futures = service.invokeAll(callableList);
for (Future<Integer> future:futures) {
//如果有一個(gè)執(zhí)行不成功,則全部回滾
if (future.get()<=0){
connection.rollback();
return;
}
}
connection.commit();
System.out.println("添加完畢");
}catch (Exception e){
connection.rollback();
log.info("error",e);
throw new ServiceException("002","出現(xiàn)異常");
}finally {
connection.close();
}
}
// sql
<insert id="saveBatch" parameterType="List">
INSERT INTO
employee (employee_id,age,employee_name,birth_date,gender,id_number,creat_time,update_time,status)
values
<foreach collection="list" item="item" index="index" separator=",">
(
#{item.employeeId},
#{item.age},
#{item.employeeName},
#{item.birthDate},
#{item.gender},
#{item.idNumber},
#{item.creatTime},
#{item.updateTime},
#{item.status}
)
</foreach>
</insert>

數(shù)據(jù)庫(kù)中一條數(shù)據(jù)：

測(cè)試結(jié)果：拋出異常，

刪除操作的數(shù)據(jù)回滾了，數(shù)據(jù)庫(kù)中的數(shù)據(jù)依舊存在，說(shuō)明事務(wù)成功了。

成功操作示例：

@Resource
SqlContext sqlContext;
/**
* 測(cè)試多線程事務(wù).
* @param employeeDOList
*/
@Override
public void saveThread(List<EmployeeDO> employeeDOList) throws SQLException {
// 獲取數(shù)據(jù)庫(kù)連接,獲取會(huì)話(內(nèi)部自有事務(wù))
SqlSession sqlSession = sqlContext.getSqlSession();
Connection connection = sqlSession.getConnection();
try {
// 設(shè)置手動(dòng)提交
connection.setAutoCommit(false);
EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);
//先做刪除操作
employeeMapper.delete(null);
ExecutorService service = ExecutorConfig.getThreadPool();
List<Callable<Integer>> callableList = new ArrayList<>();
List<List<EmployeeDO>> lists=averageAssign(employeeDOList, 5);
for (int i =0;i<lists.size();i++){
List<EmployeeDO> list = lists.get(i);
Callable<Integer> callable = () -> employeeMapper.saveBatch(list);
callableList.add(callable);
}
//執(zhí)行子線程
List<Future<Integer>> futures = service.invokeAll(callableList);
for (Future<Integer> future:futures) {
if (future.get()<=0){
connection.rollback();
return;
}
}
connection.commit();
System.out.println("添加完畢");
}catch (Exception e){
connection.rollback();
log.info("error",e);
throw new ServiceException("002","出現(xiàn)異常");
// throw new ServiceException(ExceptionCodeEnum.EMPLOYEE_SAVE_OR_UPDATE_ERROR);
}
}

測(cè)試結(jié)果：