Spring事务源码解析小结

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1、TransactionInterceptor继承TransactionAspectSupport通过事务TransactionInterceptor事务拦截器生成目标Bean的代理对象TransactionInterceptor事务拦截器（声明式事务）finalTransactionAttributetxAttr=getTransactionAttributeSource().getTransactionAttribute(invocation.getMethod(),targetClass);//拦截到方法的事务属性txAttr如：PROPAGATION_RE

2、QUIRED,ISOLATION_DEFAULTSpring拦截器默认事务属性PROPAGATION_REQUIRED,ISOLATION_DEFAULTfinalStringjoinpointIdentification=methodIdentification(invocation.getMethod());通过ClassUtils.getQualifiedMethodName(method);获取拦截到的方法名称//在切面上添加事务的方法jdk动态代理publicObjectinvoke(finalMethodInvocationinvocation)th

3、rowsThrowable{//Workoutthetargetclass:maybenull.//TheTransactionAttributeSourceshouldbepassedthetargetclass//aswellasthemethod,whichmaybefromaninterface.ClasstargetClass=(invocation.getThis()!=null?invocation.getThis().getClass():null);//Ifthetransactionattributeisnull,t

4、hemethodisnon-transactional.finalTransactionAttributetxAttr=getTransactionAttributeSource().getTransactionAttribute(invocation.getMethod(),targetClass);//拦截到方法的事务属性txAttr如：PROPAGATION_REQUIRED,ISOLATION_DEFAULTfinalStringjoinpointIdentification=methodIdentification(invocation.getMeth

5、od());if(txAttr==null

6、

7、!(getTransactionManager()instanceofCallbackPreferringPlatformTransactionManager)){//StandardtransactiondemarcationwithgetTransactionandcommit/rollbackcalls.TransactionInfotxInfo=createTransactionIfNecessary(txAttr,joinpointIdentification);//包括（txAttr，拦截到的方法join

8、Point，transactionStatus）调用底层Objecttransaction=doGetTransaction();开启事务。ObjectretVal=null;try{//Thisisanaroundadvice:Invokethenextinterceptorinthechain.//Thiswillnormallyresultinatargetobjectbeinginvoked.retVal=invocation.proceed();}catch(Throwableex){//targetinvocationexceptioncomplet

9、eTransactionAfterThrowing(txInfo,ex);throwex;}finally{cleanupTransactionInfo(txInfo);}commitTransactionAfterReturning(txInfo);//调用父类TransactionAspectSupport(含transactionManager，transactionAttributeSource)//this.transactionManager.commit(txInfo.getTransactionStatus());returnretVal;}el

10、se{//It'saCa