閑人野居
          好好學習,天天向上
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          在 1.x中,spring 的事務聲明,一直是采用動態代理bean 實現的,也就是采用ProxyFactoryBean或者子類TransactionProxyFactoryBean來實現的

          考慮下面的例子:(用1.x實現)
          <bean id="myTxManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
          ??? <property name="sessionFactory" ref="mySessionFactory"/>
          ? </bean>

          ? <bean id="myProductService" class="org.springframework.aop.framework.ProxyFactoryBean">
          ??? <property name="proxyInterfaces" value="product.ProductService"/>
          ??? <property name="target">
          ??????? <bean class="product.DefaultProductService">
          ??????????? <property name="productDao" ref="myProductDao"/>
          ??????? </bean>
          ??? </property>
          ??? <property name="interceptorNames">
          ????? <list>
          ??????? <value>myTxInterceptor</value> <!-- the transaction interceptor (configured elsewhere) -->
          ????? </list>
          ??? </property>
          ? </bean>

          ?<bean id="myTxInterceptor"

          class="org.springframework.transaction.interceptor.TransactionInterceptor">

          <property name="transactionManager">

          ?? <ref bean="myTransactionManager"/>

          </property>

          <property name="transactionAttributeSource">

          ? <value>

          ?? product.ProductService.increasePrice*=PROPAGATION_REQUIRED

          ? product.ProductService.someOtherBusinessMethod=PROPAGATION_MANDATORY

          ? </value>

          </property>

          </bean>

          或者

          <bean id="myProductService"

          class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

          <property name="transactionManager">

          <ref bean="myTransactionManager"/>

          </property>

          <property name="target">

          <ref bean="myProductServiceTarget"/>

          </property>

          <property name="transactionAttributes">

          <props>

          <prop key="increasePrice*">PROPAGATION_REQUIRED</prop>

          <prop key="someOtherBusinessMethod">PROPAGATION_MANDATORY</prop>

          </props>

          </property>
          </bean>

          當然,這需要每個服務接口都要聲明一個事務bean ,這比較麻煩,當然,spring 也提供了另外一種解決方案

          采用BeanNameAutoProxyCreator 自動代理聲明入口來全局聲明所有的事務。
          <bean id="matchAllWithPropReq"
          ?????????class="org.springframework.transaction.interceptor.MatchAlwaysTransactionAttributeSource">
          ?????????<property name="transactionAttribute"><value>PROPAGATION_REQUIRED</value></property>
          </bean>

          <bean id="matchAllTxInterceptor"
          ?????????class="org.springframework.transaction.interceptor.TransactionInterceptor">
          ?????????<property name="transactionManager"><ref bean="transactionManager"/></property>
          ?????????<property name="transactionAttributeSource"><ref bean="matchAllWithPropReq"/></property>
          </bean>
          <bean id="autoProxyCreator"
          ?????????class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
          ?????????<property name="interceptorNames">
          ????????????<list>
          ???????????????<idref local="matchAllTxInterceptor"/>
          ???????????????<idref bean="hibInterceptor"/>
          ????????????</list>
          ?????????</property>
          ?????????<property name="beanNames">
          ????????????<list>
          ???????????????<idref local="core-services-applicationControllerSevice"/>
          ???????????????<idref local="core-services-deviceService"/>
          ???????????????<idref local="core-services-authenticationService"/>
          ???????????????<idref local="core-services-packagingMessageHandler"/>
          ???????????????<idref local="core-services-sendEmail"/>
          ???????????????<idref local="core-services-userService"/>

          ????????????</list>
          ?????????</property>
          </bean>
          list中包含了所有需要實現事務的服務bean?

          ?spring 2.0帶來的aop變化和bean xml schema的變化,使得事務的處理變得更加的簡單,
          同aop一樣,事務也采用兩種方式來處理,一種主要為xml 聲明,另外的一種也就是注釋的引入。
          先來看第一種情況:
          <beans xmlns="http://www.springframework.org/schema/beans"
          ?????? xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          ?????? xmlns:aop="http://www.springframework.org/schema/aop"
          ?????? xmlns:tx="http://www.springframework.org/schema/tx"
          ?????? xsi:schemaLocation="
          ?????? http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
          ?????? http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
          ?????? http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
          ">

          ? <!-- SessionFactory, DataSource, etc. omitted -->

          ? <bean id="myTxManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
          ??? <property name="sessionFactory" ref="mySessionFactory"/>
          ? </bean>
          ?
          ? <aop:config>
          ?? <!-- 這定義了主要的切面,也就是那些接口可以使用事務,這里只是說執行ProductService的所有方法-->
          ??? <aop:pointcut id="productServiceMethods" expression="execution(* product.ProductService.*(..))"/>
          ??? <aop:advisor advice-ref="txAdvice" pointcut-ref="productServiceMethods"/>
          ? </aop:config>
          ??<!--主要的事務 advice 聲明事務的相關屬性-->
          ? <tx:advice id="txAdvice" transaction-manager="myTxManager">
          ??? <tx:attributes>
          ????? <tx:method name="increasePrice*" propagation="REQUIRED"/>
          ????? <tx:method name="someOtherBusinessMethod" propagation="REQUIRES_NEW"/>
          ????? <tx:method name="*" propagation="SUPPORTS" read-only="true"/>
          ??? </tx:attributes>
          ? </tx:advice>

          ? <bean id="myProductService" class="product.SimpleProductService">
          ??? <property name="productDao" ref="myProductDao"/>
          ? </bean>

          </beans>

          第二種方式,使用 @Transactional 注釋

          @Transactional

          public interface FooService {

          ?

          ??? Foo getFoo(String fooName);

          ?

          ??? Foo getFoo(String fooName, String barName);

          ?

          ??? void insertFoo(Foo foo);

          ?

          ??? void updateFoo(Foo foo);

          }


          xml 配置

          <!-- from the file 'context.xml' -->

          <?xml version="1.0" encoding="UTF-8"?>

          <beans xmlns="http://www.springframework.org/schema/beans"

          ?????? xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          ?????? xmlns:aop="http://www.springframework.org/schema/aop"

          ?????? xmlns:tx="http://www.springframework.org/schema/tx"

          ?????? xsi:schemaLocation="

          ?????? http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

          ?????? http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd

          ?????? http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

          ?

          ? <!-- this is the service object that we want to make transactional -->

          ? <bean id="fooService" class="x.y.service.DefaultFooService"/>

          ?

          ? <!-- enable the configuration of transactional behavior based on annotations -->

          ? <tx:annotation-driven/>

          ?

          ? <!-- a PlatformTransactionManager is still required -->

          ? <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

          ??? <!-- sourced from somewhere else -->

          ??? <property name="dataSource" ref="dataSource"/>

          ? </bean>

          ?

          ? <!-- other <bean/> definitions here -->

          ?

          </beans>

          public class DefaultFooService implements FooService {

          ?

          ??? public Foo getFoo(String fooName) {

          ??????? // do something

          ??? }

          ?

          ??? // these settings have precedence

          ??? @Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)

          ??? public void updateFoo(Foo foo) {

          ??????? // do something

          ??? }

          }

          posted on 2006-09-18 20:13 布衣郎 閱讀(2658) 評論(0)  編輯  收藏 所屬分類: spring

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