Spring+Hibernate实现动态SessionFactory切换(改进版)

前面写了一篇关于动态切换Hibernate SessionFactory的文章

发现存在一些问题：
需要配置多个HibernateTransactionManager和多个Spring 切面
这样带来两个问题
1. 程序效率降低，因为Spring进行多次Advice的拦截
2. 如果其中一个SessionFactory连接出现问题，会导致整个系统无法工作
今天研究出一种新的方法来解决此类问题
1. 数据源及Hibernate SessionFactory配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- FOR SqlServer-->
<bean id="SqlServer_DataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="url"
value="url" />
<property name="username" value="username" />
<property name="password" value="password" />
</bean>
<bean id="SqlServer_SessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
p:mappingLocations="classpath:/com/entity/*.hbm.xml">
<property name="dataSource" ref="SqlServer_DataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.SQLServer2008Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>

<!-- FOR Oracle -->
<bean id="Oracle _DataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521/orcl" />
<property name="username" value="username" />
<property name="password" value="password" />
</bean>
<bean id="Oracle_SessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
p:mappingLocations="classpath:/com/entity/*.hbm.xml">
<property name="dataSource" ref="Oracle_DataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>

</beans>

2. 定义扩展接口DynamicSessionFactoryInf继承SessionFactory

import org.hibernate.SessionFactory;
public interface DynamicSessionFactoryInf extends SessionFactory {
public SessionFactory getHibernateSessionFactory();
}

3. 定义DynamicSessionFactory实现DynamicSessionFactoryInf

public class DynamicSessionFactory implements DynamicSessionFactoryInf ,ApplicationContextAware{

private static final long serialVersionUID = 1L;
private ApplicationContext applicationContext;
//动态调用SessionFactory
private SessionFactory getHibernateSessionFactory(String name) {
return (SessionFactory) applicationContext.getBean(name);
}
//实现DynamicSessionFactoryInf 接口的方法
public SessionFactory getHibernateSessionFactory() {
return getHibernateSessionFactory(ThreadLocalUtil.getCurrentITAsset()
.getSessionFactoryName());
}

//以下是实现SessionFactory接口的方法，并对当前的SessionFactory实体进行代理
public Reference getReference() throws NamingException {
return getHibernateSessionFactory().getReference();
}

public Session openSession() throws HibernateException {
return getHibernateSessionFactory().openSession();
}
public Session openSession(Interceptor interceptor)
throws HibernateException {
return getHibernateSessionFactory().openSession(interceptor);
}
public Session openSession(Connection connection) {
return getHibernateSessionFactory().openSession(connection);
}
public Session openSession(Connection connection, Interceptor interceptor) {
return getHibernateSessionFactory().openSession(connection,interceptor);
}
public Session getCurrentSession() throws HibernateException {
return getHibernateSessionFactory().getCurrentSession();
}
public StatelessSession openStatelessSession() {
return getHibernateSessionFactory().openStatelessSession();
}
public StatelessSession openStatelessSession(Connection connection) {
return getHibernateSessionFactory().openStatelessSession(connection);
}
public ClassMetadata getClassMetadata(Class entityClass) {
return getHibernateSessionFactory().getClassMetadata(entityClass);
}
public ClassMetadata getClassMetadata(String entityName) {
return getHibernateSessionFactory().getClassMetadata(entityName);
}
public CollectionMetadata getCollectionMetadata(String roleName) {
return getHibernateSessionFactory().getCollectionMetadata(roleName);
}
public Map getAllClassMetadata() {
return getHibernateSessionFactory().getAllClassMetadata();
}
public Map getAllCollectionMetadata() {
return getHibernateSessionFactory().getAllCollectionMetadata();
}
public Statistics getStatistics() {
return getHibernateSessionFactory().getStatistics();
}
public void close() throws HibernateException {
getHibernateSessionFactory().close();
}
public boolean isClosed() {
return getHibernateSessionFactory().isClosed();
}
public Cache getCache() {
return getHibernateSessionFactory().getCache();
}
public void evict(Class persistentClass) throws HibernateException {
getHibernateSessionFactory().evict(persistentClass);
}
public void evict(Class persistentClass, Serializable id)
throws HibernateException {
getHibernateSessionFactory().evict(persistentClass, id);
}
public void evictEntity(String entityName) throws HibernateException {
getHibernateSessionFactory().evictEntity(entityName);
}
public void evictEntity(String entityName, Serializable id)
throws HibernateException {
getHibernateSessionFactory().evictEntity(entityName, id);
}
public void evictCollection(String roleName) throws HibernateException {
getHibernateSessionFactory().evictCollection(roleName);
}
public void evictCollection(String roleName, Serializable id)
throws HibernateException {
getHibernateSessionFactory().evictCollection(roleName, id);
}
public void evictQueries(String cacheRegion) throws HibernateException {
getHibernateSessionFactory().evictQueries(cacheRegion);
}
public void evictQueries() throws HibernateException {
getHibernateSessionFactory().evictQueries();
}
public Set getDefinedFilterNames() {
return getHibernateSessionFactory().getDefinedFilterNames();
}
public FilterDefinition getFilterDefinition(String filterName)
throws HibernateException {
return getHibernateSessionFactory().getFilterDefinition(filterName);
}
public boolean containsFetchProfileDefinition(String name) {
return getHibernateSessionFactory().containsFetchProfileDefinition(name);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.applicationContext = applicationContext;
}

}

4. 配置动态SessionFactory

<bean id="sessionFactory" class="com.hp.it.qdpadmin.common.DynamicSessionFactory"/>

5. 定义DynamicTransactionManager继承HibernateTransactionManager

public class DynamicTransactionManager extends HibernateTransactionManager {
private static final long serialVersionUID = 1047039346475978451L;
//重写getDataSource方法，实现动态获取
public DataSource getDataSource() {
DataSource sfds = SessionFactoryUtils.getDataSource(getSessionFactory());
return sfds;
}
//重写getSessionFactory方法，实现动态获取SessionFactory
public SessionFactory getSessionFactory() {
DynamicSessionFactoryInf dynamicSessionFactory = (DynamicSessionFactoryInf) super
.getSessionFactory();
SessionFactory hibernateSessionFactory = dynamicSessionFactory
.getHibernateSessionFactory();
return hibernateSessionFactory;
}
//重写afterPropertiesSet，跳过数据源的初始化等操作
public void afterPropertiesSet() {
return;
}
}

6. 配置dynamicTransactionManager

<bean id="dynamicTransactionManager"
class="com.hp.it.qdpadmin.common.DynamicTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>

7. 为SessionFactory配置事务切面

<tx:advice id="dynamicTxAdvice" transaction-manager="dynamicTransactionManager">
<tx:attributes>
<tx:method name="get*" read-only="true" />
<tx:method name="find*" read-only="true" />
<tx:method name="*" propagation="REQUIRED" rollback-for="Exception" />
</tx:attributes>
</tx:advice>

<aop:config proxy-target-class="true">
<aop:pointcut id="txPointcut" expression="execution(* com.service.*.*(..))"/>
<aop:advisor advice-ref="dynamicTxAdvice" pointcut-ref="txPointcut" />
</aop:config>