Spring事务管理的改进

 

Spring对service的事务管理通常类似这样：

1. <bean id="txProxyTemplate" abstract="true"
2. class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
3.      <property name="transactionManager">
4.          ref bean="transactionManager"/>
5.      </property>
6.      <property name="transactionAttributes">
7.          <props>
8.              <prop key="find*">PROPAGATION_REQUIRED, readOnly</prop>
9.              <prop key="*">PROPAGATION_REQUIRED</prop>
10.          </props>
11.      </property>
12. </bean>
14. <bean id="userManager" parent="txProxyTemplate">
15.      <property name="target">
16.          <bean class="some.package.UserManagerImpl">
17.              <property name="userDAO"><ref bean="userDAO"/></property>
18.          </bean>
19.      </property>
20. </bean>以后，如果增加新的Service/Manager，则XML配置的增量是这一段：
22. <bean id="someOtherManager" parent="txProxyTemplate">
23.      <property name="target">
24.          <bean class="some.package.someOtherManagerImpl">
25.          </bean>
26.      </property>

其实可以这样：

1. <beans>
2.      <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) -->
3.      <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
4.          <property name="sessionFactory">
5.              <ref bean="sessionFactory"/>
6.          </property>
7.      </bean>
9.      <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">
10.          <property name="transactionManager" ref="transactionManager"/>?
11.    <property name="transactionAttributes">
12.     <props>
13.      <prop key="*">PROPAGATION_REQUIRED</prop>
14.      <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
15.     </props>
16.    </property>
17.      </bean>
19.      <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
20.          <property name="beanNames">
21.              <value>*Service,*Manager</value>
22.          </property>
23.          <property name="interceptorNames">
24.              <list>
25.                  <value>transactionInterceptor</value>
26.                  <!-- 此处增加新的Interceptor -->
27.              </list>
28.          </property>
29.      </bean>
31.      <bean class="org.springframework.transaction.interceptor.TransactionAttributeSourceAdvisor">
32.          <property name="transactionInterceptor" ref="transactionInterceptor"/>?
33.      </bean>
35.      <bean id="userManager" class="some.package.UserManagerImpl" autoWire="byName"/>
37. </beans>

以后每次的增量是这一段：

<bean id="userManager" class="some.package.UserManagerImpl" autoWire="byName"/>跟配置普通bean的方法一样，非常简洁、直观。