请教一个关于Spring配置的基础的问题

elgs

I am sorry if my question is stupid.

I am confused about the following snippet of spring configuration file.

1. <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">                ......
   
2.         </bean>
   
3. 
   
4. 
   
5.         <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
   
6.                 <property name="sessionFactory">
   
7.                         <ref local="sessionFactory" />
   
8.                 </property>
   
9.         </bean>

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Now, as much as I know, HibernateTransactionManager should has a setSessionFactory(SessionFactory) method itself or inherited, and it's true it does have it. And I suppose at the startup time, spring should inject an instance of LocalSessionFactoryBean in to the setSessionFactory method as the parameter. What confused me is that why LocalSessionFactoryBean is not of the type SessionFactory, I don't think an instance of not SessionFactory can be passed in the method. I looked up the source code of spring,

1. LocalSessionFactoryBean extends AbstractSessionFactoryBean

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, and

1. AbstractSessionFactoryBean
   
2.                 implements FactoryBean, InitializingBean, DisposableBean, PersistenceExceptionTranslator

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. None of the above is instance of SessionFactory.

Could anybody help me, thanks in advance.

2195113

看看源代码:

protected SessionFactory newSessionFactory(Configuration config) throws HibernateException {
                return config.buildSessionFactory();
        }

gazania

AbstractSessionFactoryBean实现了FactoryBean接口，ref该bean得到的是factory管理的SessionFactory实例而不是factory本身。

可以去参考一下AbstractSessionFactoryBean的代码。