spring.nettx:advice 和 aop:config配置事务 匹配名字的方法管理事务

xiaoxiao2021-03-01  11


<?xml version="1.0" encoding="utf-8" ?> <objects xmlns="http://www.springframework.net" xmlns:aop = "http://www.springframework.net/aop" xmlns:tx="http://www.springframework.net/tx"> <!--fun list--> <object id="userFunServer" type="com.elitel.im.bl.system.impl.UserFunImpl, com.elitel.im.bl"> <property name="UserDao" ref="userDao"/> </object> <!--自定义驱动方式(根据方法的名字判断事务的类型)--> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <!-- the transactional semantics...--> <tx:attributes> <!-- all methods starting with 'get' are read-only --> <tx:method name="Get*" read-only="true"/> <!-- other methods use the default transaction settings (see below) --> <tx:method name="Do*"/> </tx:attributes> </tx:advice> <object id="serviceOperation" type="Spring.Aop.Support.SdkRegularExpressionMethodPointcut, Spring.Aop"> <property name="pattern" value="com.elitel.im.bl.*"/> </object> <aop:config> <aop:advisor pointcut-ref="serviceOperation" advice-ref="txAdvice"/> </aop:config> </objects>

主要是<property name="pattern" value="com.elitel.im.bl.*"/>节点的配置,表示匹配com.elitel.im.bl下所有的类及方法。


You can also define the transactional semantics you want to apply through the use of a <tx:advice> definition. This lets you define the transaction metadata such as propagation and isolation level as well as the methods for which that metadata applies external to the code unlike the case of using the transaction attribute. The <tx:advice> definition creates an instance of a ITransactionAttributeSource during parsing time. Switching to use <tx:advice> instead of <tx:attribute-driven/> in the example would look like the following

<tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="Save*"/> <tx:method name="Delete*"/> </tx:attributes> </tx:advice>

This says that all methods that start with Save and Delete would have associated with them the default settings of transaction metadata. These default values are listed below..

Here is an example using other elements of the <tx:method/> definition

<!-- the transactional advice (i.e. what 'happens'; see the <aop:advisor/> object below) --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <!-- the transactional semantics... --> <tx:attributes> <!-- all methods starting with 'get' are read-only --> <tx:method name="Get*" read-only="true"/> <!-- other methods use the default transaction settings (see below) --> <tx:method name="*"/> </tx:attributes> </tx:advice>

The <tx:advice/> definition reads as “... all methods on starting with 'Get' are to execute in the context of a read-only transaction, and all other methods are to execute with the default transaction semantics”. The 'transaction-manager' attribute of the <tx:advice/> tag is set to the name of the PlatformTransactionManager object that is going to actually drive the transactions (in this case the 'transactionManager' object).

You can also use the AOP namespace <aop:advisor> element to tie together a pointcut and the above defined advice as shown below.

<object id="serviceOperation" type="Spring.Aop.Support.SdkRegularExpressionMethodPointcut, Spring.Aop"> <property name="pattern" value="Spring.TxQuickStart.Services.*"/> </object> <aop:config> <aop:advisor pointcut-ref="serviceOperation" advice-ref="txAdvice"/> </aop:config>

This is assuming that the service layer class, TestObjectManager, in the namespace Spring.TxQuickStart.Services. The <aop:config/> definition ensures that the transactional advice defined by the 'txAdvice' object actually executes at the appropriate points in the program. First we define a pointcut that matches any operation defined on classes in the Spring.TxQuickStart.Services (you can be more selective in your regular expression). Then we associate the pointcut with the 'txAdvice' using an advisor. In the example, the result indicates that at the execution of a 'SaveTwoTestObjects' and 'DeleteTwoTestObject', the advice defined by 'txAdvice' will be run.

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