一次Spring Transactional嵌套事务使用不同的rollbackFor的分析

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一次Spring Transactional嵌套事务使用不同的rollbackFor的分析

　　起因：

　　　　项目期间由于一次异常回滚问题，发现自己在事务知识方面知识的遗漏，趁着这次机会，做了几次rollbackFor的测试。

　　测试：

　　　　现在有两个事务，事务oute包含事务Inner。事务A回滚规则是当事务抛出TestException，其中TestException继承RunTimeException。事务B的回滚规则是事务抛RuntimeException。事务的传播方式都是使用的默认，即 Propagation.REQUIRED。如以下代码：

 1     @Override
 2     @Transactional(rollbackFor = TestException.class)
 3     public void transOuter() {
 4         productMapper.updateOrderQuantityPessimistic(product_code1);
 5         ((ProductService) AopContext.currentProxy()).transInner();
 6     }
 7 
 8     @Transactional(rollbackFor = Exception.class)
 9     public void transInner() {
10         productMapper.updateOrderQuantityPessimistic(product_code);
11         if (true) {
12             throw new RuntimeException();
13         }
14     }

　　　　以下为TestException的代码。

1 public class TestException extends RuntimeException {
2 
3     public TestException(String message) {
4         super(message);
5     }
6 }

　　　一开始按照自己对事务的理解，默认的传播属性之下。事务B启动的时候，会默认使用事务A的rollbackFor来进行回滚，所以该代码运行时候。程序不会回滚。

　　　然而测试，测试完之后发现事务A、B都进行了回滚。

　　　看着测试结果产生了疑问。难道是以innner的rollBack为准？接着进行测试。

 1     @Override
 2     @Transactional(rollbackFor = Exception.class)
 3     public void transOuter() {
 4         productMapper.updateOrderQuantityPessimistic(product_code1);
 5         ((ProductService) AopContext.currentProxy()).transInner();
 6     }
 7 
 8     @Transactional(rollbackFor = TestException.class)
 9     public void transInner() {
10         productMapper.updateOrderQuantityPessimistic(product_code);
11         if (true) {
12             throw new RuntimeException();
13         }
14     }

　　　　再次测试，测试完之后发现事务A、B依然进行了回滚。

　　　　感觉自己对事务的理解还是太浅薄了，是时候debug一波源码。

　　分析源码：

　　查看 org.springframework.transaction.interceptor.TransactionAspectSupport 类的 invokeWithinTransaction方法。该方法是事务执行的主要方法，这里我们主要看第20行的事务捕捉那一块。completeTransactionAfterThrowing的方法。

 1     protected Object invokeWithinTransaction(Method method, Class<?> targetClass, final InvocationCallback invocation)
 2             throws Throwable {
 3 
 4         // If the transaction attribute is null, the method is non-transactional.
 5         final TransactionAttribute txAttr = getTransactionAttributeSource().getTransactionAttribute(method, targetClass);
 6         final PlatformTransactionManager tm = determineTransactionManager(txAttr);
 7         final String joinpointIdentification = methodIdentification(method, targetClass);
 8 
 9         if (txAttr == null || !(tm instanceof CallbackPreferringPlatformTransactionManager)) {
10             // Standard transaction demarcation with getTransaction and commit/rollback calls.
11             TransactionInfo txInfo = createTransactionIfNecessary(tm, txAttr, joinpointIdentification);
12             Object retVal = null;
13             try {
14                 // This is an around advice: Invoke the next interceptor in the chain.
15                 // This will normally result in a target object being invoked.
16                 retVal = invocation.proceedWithInvocation();
17             }
18             catch (Throwable ex) {
19                 // 事务异常捕捉主要在这边获取
20                 completeTransactionAfterThrowing(txInfo, ex);
21                 throw ex;
22             }
23             finally {
24                 cleanupTransactionInfo(txInfo);
25             }
26             commitTransactionAfterReturning(txInfo);
27             return retVal;
28         }
29 
30         else {
31             // It's a CallbackPreferringPlatformTransactionManager: pass a TransactionCallback in.
32             try {
33                 Object result = ((CallbackPreferringPlatformTransactionManager) tm).execute(txAttr,
34                         new TransactionCallback<Object>() {
35                             @Override
36                             public Object doInTransaction(TransactionStatus status) {
37                                 TransactionInfo txInfo = prepareTransactionInfo(tm, txAttr, joinpointIdentification, status);
38                                 try {
39                                     return invocation.proceedWithInvocation();
40                                 }
41                                 catch (Throwable ex) {
42                                     if (txAttr.rollbackOn(ex)) {
43                                         // A RuntimeException: will lead to a rollback.
44                                         if (ex instanceof RuntimeException) {
45                                             throw (RuntimeException) ex;
46                                         }
47                                         else {
48                                             throw new ThrowableHolderException(ex);
49                                         }
50                                     }
51                                     else {
52                                         // A normal return value: will lead to a commit.
53                                         return new ThrowableHolder(ex);
54                                     }
55                                 }
56                                 finally {
57                                     cleanupTransactionInfo(txInfo);
58                                 }
59                             }
60                         });
61 
62                 // Check result: It might indicate a Throwable to rethrow.
63                 if (result instanceof ThrowableHolder) {
64                     throw ((ThrowableHolder) result).getThrowable();
65                 }
66                 else {
67                     return result;
68                 }
69             }
70             catch (ThrowableHolderException ex) {
71                 throw ex.getCause();
72             }
73         }
74     }

　　这边显示当事务的rollbackFor为TestException，而抛出的异常为RunTimeException时候。跟我们的transInner一致。接着往下看 completeTransactionAfterThrowing 方法。主要看第8行，第8行对事务进行判断，是否对该抛出的异常进行回滚。

 1 protected void completeTransactionAfterThrowing(TransactionAspectSupport.TransactionInfo txInfo, Throwable ex) {
 2         if (txInfo != null && txInfo.hasTransaction()) {
 3             if (logger.isTraceEnabled()) {
 4                 logger.trace("Completing transaction for [" + txInfo.getJoinpointIdentification() +
 5                         "] after exception: " + ex);
 6             }
 7             //这里主要判断事务捕获了异常以后，是否进行回滚
 8             if (txInfo.transactionAttribute.rollbackOn(ex)) {
 9                 try {
10                     txInfo.getTransactionManager().rollback(txInfo.getTransactionStatus());
11                 }
12                 catch (TransactionSystemException ex2) {
13                     logger.error("Application exception overridden by rollback exception", ex);
14                     ex2.initApplicationException(ex);
15                     throw ex2;
16                 }
17                 catch (RuntimeException ex2) {
18                     logger.error("Application exception overridden by rollback exception", ex);
19                     throw ex2;
20                 }
21                 catch (Error err) {
22                     logger.error("Application exception overridden by rollback error", ex);
23                     throw err;
24                 }
25             }
26             else {
27                 // We don't roll back on this exception.
28                 // Will still roll back if TransactionStatus.isRollbackOnly() is true.
29                 try {
30                     txInfo.getTransactionManager().commit(txInfo.getTransactionStatus());
31                 }
32                 catch (TransactionSystemException ex2) {
33                     logger.error("Application exception overridden by commit exception", ex);
34                     ex2.initApplicationException(ex);
35                     throw ex2;
36                 }
37                 catch (RuntimeException ex2) {
38                     logger.error("Application exception overridden by commit exception", ex);
39                     throw ex2;
40                 }
41                 catch (Error err) {
42                     logger.error("Application exception overridden by commit error", ex);
43                     throw err;
44                 }
45             }
46         }
47     }

　　　　再深入点进去看，看到第11行，这边获取该异常的深度。跳转到片段二进行代码查看。

 1     public boolean rollbackOn(Throwable ex) {
 2         if (logger.isTraceEnabled()) {
 3             logger.trace("Applying rules to determine whether transaction should rollback on " + ex);
 4         }
 5 
 6         RollbackRuleAttribute winner = null;
 7         int deepest = Integer.MAX_VALUE;
 8 
 9         if (this.rollbackRules != null) {
10             for (RollbackRuleAttribute rule : this.rollbackRules) {
11                 //获取异常的深度?
12                 int depth = rule.getDepth(ex);
13                 if (depth >= 0 && depth < deepest) {
14                     deepest = depth;
15                     winner = rule;
16                 }
17             }
18         }
19 
20         if (logger.isTraceEnabled()) {
21             logger.trace("Winning rollback rule is: " + winner);
22         }
23 
24         // User superclass behavior (rollback on unchecked) if no rule matches.
25         if (winner == null) {
26             logger.trace("No relevant rollback rule found: applying default rules");
27             //如果depth为-1之后，父类的回滚方式
28             return super.rollbackOn(ex);
29         }
30 
31         return !(winner instanceof NoRollbackRuleAttribute);
32     }

　　　　根据深度代码查看，rollbackFor和抛出异常ex不一致，返回-1。再回去看上面的代码片段，当返回-1之后，代码走到第28行。进行父类的回滚方法。

 1     private int getDepth(Class<?> exceptionClass, int depth) {
 2         if (exceptionClass.getName().contains(this.exceptionName)) {
 3             // Found it!
 4             return depth;
 5         }
 6         // If we've gone as far as we can go and haven't found it...
 7         //此处RuntimeException 跟TestException不一致，返回-1
 8         if (exceptionClass == Throwable.class) {
 9             return -1;
10         }
11         return getDepth(exceptionClass.getSuperclass(), depth + 1);
12     }

　　　　以下是父类的代码是否回滚判断方法，有没有很眼熟，只要抛出的异常的是RunTimeExcpetion或者Error则进行回滚。

1     public boolean rollbackOn(Throwable ex) {
2         return (ex instanceof RuntimeException || ex instanceof Error);
3     }

　　总结

　　　　根据上面的代码，我们可以推断出以下几个结论：

　　　　1、当我们抛出的异常为RunTime及其子类或者Error和其子类的时候。不论rollbackFor的异常是啥，都会进行事务的回滚。

　　　　2、当我们抛出的异常不是RunTime及其子类或者Error和其子类的时候，必须根据rollbackfor进行回滚。比如rollbackfor=RuntimeException，而抛出IOException时候，事务是不进行回滚的。

　　　　3、当我们抛出的异常不是RunTime及其子类或者Error和其子类的时候，如果嵌套事务中，只要有一个rollbackfor允许回滚，则整个事务回滚。

　　　　经过测试，上述的结论也没发现什么问题。

posted on 2018-06-29 18:03 阿姆斯特朗回旋炮阅读(...) 评论(...) 编辑收藏