HierarchicalBeanFactory接口

Love The Way You Lie 2023-08-17 16:04 67阅读 0赞

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HierarchicalBeanFactory 提供父容器的访问功能.至于父容器的设置,需要找ConfigurableBeanFactory的setParentBeanFactory(接口把设置跟获取给拆开了!).  
HierarchicalBeanFactory源码具体：

1、第一个方法返回本Bean工厂的父工厂。这个方法实现了工厂的分层。

2、第二个方法判断本地工厂是否包含这个Bean（忽略其他所有父工厂）。这也是分层思想的体现。

总结：这个工厂接口非常简单，实现了Bean工厂的分层。这个工厂接口也是继承自BeanFacotory，也是一个二级接口，相对于父接口，它只扩展了一个重要的功能——工厂分层。

/** * Sub-interface implemented by bean factories that can be part * of a hierarchy. * * <p>The corresponding {@code setParentBeanFactory} method for bean * factories that allow setting the parent in a configurable * fashion can be found in the ConfigurableBeanFactory interface. * * @author Rod Johnson * @author Juergen Hoeller * @since 07.07.2003 * @see org.springframework.beans.factory.config.ConfigurableBeanFactory#setParentBeanFactory */
    public interface HierarchicalBeanFactory extends BeanFactory { 
    
        /** * Return the parent bean factory, or {@code null} if there is none. */
        // // 返回本Bean工厂的父工厂
        BeanFactory getParentBeanFactory();
    
        /** * Return whether the local bean factory contains a bean of the given name, * ignoring beans defined in ancestor contexts. * <p>This is an alternative to {@code containsBean}, ignoring a bean * of the given name from an ancestor bean factory. * @param name the name of the bean to query * @return whether a bean with the given name is defined in the local factory * @see BeanFactory#containsBean */
         // 本地工厂(容器)是否包含这个Bean
        boolean containsLocalBean(String name);
    
    }

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