Spring 多数据源声明式事务控制(PlatformTransactionManager )
- - 开源软件 - ITeye博客首先是TransactionManager的配置:. 配置事务回滚的场景 -->. . 这里用到了spring的tx和aop标签, 都是spring的参考手册中的典型配置. 当调用指定的packageName.method(..)方法的时候, 将采用事务拦截, 如果在对该方法的调用过程中出现了任何异常将导致事务回滚.
<?xml version="1.0" encoding="gb2312"?> <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-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"> <bean id="db1Tx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"> <ref bean="db1" /> </property> </bean> <bean id="db2Tx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"> <ref bean="db2" /> </property> </bean> <bean id="dbcTx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"> <ref bean="dbc" /> </property> </bean> <bean id="routingTransactionManager" class="com.mysoft.manager.impl.RoutingTransactionManager"> <property name="targetTransactionManagers"> <map value-type="org.springframework.transaction.PlatformTransactionManager"> <entry key="db1" value-ref="db1Tx" /> <entry key="db2" value-ref="db2Tx" /> <entry key="dbc" value-ref="dbcTx" /> </map> </property> </bean> <!-- 配置事务回滚的场景 --> <tx:advice id="txAdvice" transaction-manager="routingTransactionManager"> <tx:attributes> <tx:method name="*" rollback-for="java.lang.Exception"/> </tx:attributes> </tx:advice> <!-- 指定那些类的哪些方法参与事务 --> <aop:config> <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.mysoft.manager.Manager1.publish(..))"/> <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.mysoft.manager.Manager2.audit(..))"/> </aop:config> </beans>这里用到了spring的tx和aop标签, 都是spring的参考手册中的典型配置. 当调用指定的packageName.method(..)方法的时候, 将采用事务拦截, 如果在对该方法的调用过程中出现了任何异常将导致事务回滚.
/** * 用来存储路由到指定tx的Context * */ @SuppressWarnings("unchecked") public class RoutingContextHolder<T> { private static final ThreadLocal contextHolder = new ThreadLocal(); public static <T> void setContext(T context) { Validate.notNull(context, "必须指定路由的context"); contextHolder.set(context); } public static <T> T getContext() { return (T) contextHolder.get(); } }
/** * 根据给定的路由规则来路由到合适的tx类 * * @see RoutingContextHolder */ public class RoutingTransactionManager implements PlatformTransactionManager { private Map<Object, PlatformTransactionManager> targetTransactionManagers = new HashMap<Object, PlatformTransactionManager>(); /** * 根据给定的规则获取指定的tx * * @return */ protected PlatformTransactionManager getTargetTransactionManager() { Object context = RoutingContextHolder.getContext(); Validate.notNull(context, "必须指定路由的context"); return targetTransactionManagers.get(context); } public void setTargetTransactionManagers(Map<Object, PlatformTransactionManager> targetTransactionManagers) { this.targetTransactionManagers = targetTransactionManagers; } public void commit(TransactionStatus status) throws TransactionException { getTargetTransactionManager().commit(status); } public TransactionStatus getTransaction(TransactionDefinition definition) throws TransactionException { return getTargetTransactionManager().getTransaction(definition); } public void rollback(TransactionStatus status) throws TransactionException { getTargetTransactionManager().rollback(status); } }其调用代码如下:
// 指定tx的路由context RoutingContextHolder.setContext("db1"); return manager1.publish(item);