beanFactory的繼承關(guān)系如下圖所示：

? ? ? (圖片來(lái)源：http://www.myexception.cn/software-architecture-design/925888.html)

在上節(jié)beanFactory的進(jìn)化史，我們就講到了上圖的左邊部分，這次我們來(lái)分析一下圖的右邊部分。AliasRegistry 是一個(gè)用于別名管理的通用接口，BeanDefinitionRegistry繼承了該接口。

SimpleAliasRegistry作為一個(gè)基類，實(shí)現(xiàn)了AliasRegistry接口。

SingletonBeanRegistry是spring 提供的一個(gè)共享bean的注冊(cè)接口。實(shí)現(xiàn)該接口可以方便對(duì)單例進(jìn)行管理。

public interface SingletonBeanRegistry {/*** Register the given existing object as singleton in the bean registry,* under the given bean name.* <p>The given instance is supposed to be fully initialized; the registry* will not perform any initialization callbacks (in particular, it won't* call InitializingBean's {@code afterPropertiesSet} method).* The given instance will not receive any destruction callbacks* (like DisposableBean's {@code destroy} method) either.* <p>When running within a full BeanFactory: <b>Register a bean definition* instead of an existing instance if your bean is supposed to receive* initialization and/or destruction callbacks.</b>* <p>Typically invoked during registry configuration, but can also be used* for runtime registration of singletons. As a consequence, a registry* implementation should synchronize singleton access; it will have to do* this anyway if it supports a BeanFactory's lazy initialization of singletons.* @param beanName the name of the bean* @param singletonObject the existing singleton object* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet* @see org.springframework.beans.factory.DisposableBean#destroy* @see org.springframework.beans.factory.support.BeanDefinitionRegistry#registerBeanDefinition*/void registerSingleton(String beanName, Object singletonObject);/*** Return the (raw) singleton object registered under the given name.* <p>Only checks already instantiated singletons; does not return an Object* for singleton bean definitions which have not been instantiated yet.* <p>The main purpose of this method is to access manually registered singletons* (see {@link #registerSingleton}). Can also be used to access a singleton* defined by a bean definition that already been created, in a raw fashion.* <p><b>NOTE:</b> This lookup method is not aware of FactoryBean prefixes or aliases.* You need to resolve the canonical bean name first before obtaining the singleton instance.* @param beanName the name of the bean to look for* @return the registered singleton object, or {@code null} if none found* @see ConfigurableListableBeanFactory#getBeanDefinition*/Object getSingleton(String beanName);/*** Check if this registry contains a singleton instance with the given name.* <p>Only checks already instantiated singletons; does not return {@code true}* for singleton bean definitions which have not been instantiated yet.* <p>The main purpose of this method is to check manually registered singletons* (see {@link #registerSingleton}). Can also be used to check whether a* singleton defined by a bean definition has already been created.* <p>To check whether a bean factory contains a bean definition with a given name,* use ListableBeanFactory's {@code containsBeanDefinition}. Calling both* {@code containsBeanDefinition} and {@code containsSingleton} answers* whether a specific bean factory contains a local bean instance with the given name.* <p>Use BeanFactory's {@code containsBean} for general checks whether the* factory knows about a bean with a given name (whether manually registered singleton* instance or created by bean definition), also checking ancestor factories.* <p><b>NOTE:</b> This lookup method is not aware of FactoryBean prefixes or aliases.* You need to resolve the canonical bean name first before checking the singleton status.* @param beanName the name of the bean to look for* @return if this bean factory contains a singleton instance with the given name* @see #registerSingleton* @see org.springframework.beans.factory.ListableBeanFactory#containsBeanDefinition* @see org.springframework.beans.factory.BeanFactory#containsBean*/boolean containsSingleton(String beanName);/*** Return the names of singleton beans registered in this registry.* <p>Only checks already instantiated singletons; does not return names* for singleton bean definitions which have not been instantiated yet.* <p>The main purpose of this method is to check manually registered singletons* (see {@link #registerSingleton}). Can also be used to check which singletons* defined by a bean definition have already been created.* @return the list of names as a String array (never {@code null})* @see #registerSingleton* @see org.springframework.beans.factory.support.BeanDefinitionRegistry#getBeanDefinitionNames* @see org.springframework.beans.factory.ListableBeanFactory#getBeanDefinitionNames*/String[] getSingletonNames();/*** Return the number of singleton beans registered in this registry.* <p>Only checks already instantiated singletons; does not count* singleton bean definitions which have not been instantiated yet.* <p>The main purpose of this method is to check manually registered singletons* (see {@link #registerSingleton}). Can also be used to count the number of* singletons defined by a bean definition that have already been created.* @return the number of singleton beans* @see #registerSingleton* @see org.springframework.beans.factory.support.BeanDefinitionRegistry#getBeanDefinitionCount* @see org.springframework.beans.factory.ListableBeanFactory#getBeanDefinitionCount*/int getSingletonCount();}

注冊(cè)接口的默認(rèn)實(shí)現(xiàn)為：DefaultSingletonBeanRegistry，主要作用是提供能被所有調(diào)用者共享bean的注冊(cè)，調(diào)用者可用通過(guò)bean 名稱獲取到該bean的實(shí)例。同時(shí)該類也提供了對(duì)注冊(cè)bean的銷毀方法。

DefaultSingletonBeanRegistry也實(shí)現(xiàn)了AliasRegistry接口，增加了對(duì)別名的管理。

?FactoryBeanRegistrySupport 集成了DefaultSingletonBeanRegistry對(duì)bean的單例bean的管理功能，是一個(gè)基類，用來(lái)處理FactoryBean實(shí)例的單例bean的注冊(cè)。

我們重點(diǎn)介紹來(lái)研究一下AbstractBeanFactory的代碼：

public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport implements ConfigurableBeanFactory { // to do more }

從繼承關(guān)系上來(lái)講，AbstractBeanFactory具備了ConfigurableBeanFactory 的完整功能，

轉(zhuǎn)載于:https://www.cnblogs.com/davidwang456/p/4153756.html

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