spring beans源码解读之--BeanFactory进化史

BeanFactory是访问bean容器的根接口，它是一个bean容器的基本客户端视图。

先让我们看看beanfactory的前生后世吧！

beanFactory有四个重要的子接口：

　SimpleJndiBeanFactory是spring beanFactory接口的基于jndi的简单实现。不支持枚举bean定义，故不需要实现ListableBeanFactory接口。这个bean工厂可以解析制定名称的jndi名称，在J2EE应用中，jndi名称的命名空间为"java:/comp/env/".

这个bean工厂主要和spring的CommonAnnotationBeanPostProcessor 联合使用。

The main intent of this factory is usage in combination with Spring's CommonAnnotationBeanPostProcessor, configured as "resourceFactory" for resolving @Resource annotations as JNDI objects without intermediate bean definitions. It may be used for similar lookup scenarios as well, of course, in particular if BeanFactory-style type checking is required.

ListableBeanFactory是beanFactory接口的扩展接口，它可以枚举所有的bean实例，而不是客户端通过名称一个一个的查询得出所有的实例。要预加载所有的bean定义的beanfactory可以实现这个接口来。该 接口定义了访问容器中Bean基本信息的若干方法，如查看Bean的个数、获取某一类型Bean的配置名、查看容器中是否包括某一Bean等方法；

    /**
     * Check if this bean factory contains a bean definition with the given name.
     * <p>Does not consider any hierarchy this factory may participate in,
     * and ignores any singleton beans that have been registered by
     * other means than bean definitions.
     * @param beanName the name of the bean to look for
     * @return if this bean factory contains a bean definition with the given name
     * @see #containsBean
     */
    boolean containsBeanDefinition(String beanName);

    /**
     * Return the number of beans defined in the factory.
     * <p>Does not consider any hierarchy this factory may participate in,
     * and ignores any singleton beans that have been registered by
     * other means than bean definitions.
     * @return the number of beans defined in the factory
     */
    int getBeanDefinitionCount();

    /**
     * Return the names of all beans defined in this factory.
     * <p>Does not consider any hierarchy this factory may participate in,
     * and ignores any singleton beans that have been registered by
     * other means than bean definitions.
     * @return the names of all beans defined in this factory,
     * or an empty array if none defined
     */
    String[] getBeanDefinitionNames();

    /**
     * Return the names of beans matching the given type (including subclasses),
     * judging from either bean definitions or the value of {@code getObjectType}
     * in the case of FactoryBeans.
     * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
     * check nested beans which might match the specified type as well.
     * <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
     * will get initialized. If the object created by the FactoryBean doesn't match,
     * the raw FactoryBean itself will be matched against the type.
     * <p>Does not consider any hierarchy this factory may participate in.
     * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
     * to include beans in ancestor factories too.
     * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
     * by other means than bean definitions.
     * <p>This version of {@code getBeanNamesForType} matches all kinds of beans,
     * be it singletons, prototypes, or FactoryBeans. In most implementations, the
     * result will be the same as for {@code getBeanNamesOfType(type, true, true)}.
     * <p>Bean names returned by this method should always return bean names <i>in the
     * order of definition</i> in the backend configuration, as far as possible.
     * @param type the class or interface to match, or {@code null} for all bean names
     * @return the names of beans (or objects created by FactoryBeans) matching
     * the given object type (including subclasses), or an empty array if none
     * @see FactoryBean#getObjectType
     * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class)
     */
    String[] getBeanNamesForType(Class<?> type);

    /**
     * Return the names of beans matching the given type (including subclasses),
     * judging from either bean definitions or the value of {@code getObjectType}
     * in the case of FactoryBeans.
     * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
     * check nested beans which might match the specified type as well.
     * <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
     * which means that FactoryBeans will get initialized. If the object created by the
     * FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
     * type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
     * (which doesn't require initialization of each FactoryBean).
     * <p>Does not consider any hierarchy this factory may participate in.
     * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
     * to include beans in ancestor factories too.
     * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
     * by other means than bean definitions.
     * <p>Bean names returned by this method should always return bean names <i>in the
     * order of definition</i> in the backend configuration, as far as possible.
     * @param type the class or interface to match, or {@code null} for all bean names
     * @param includeNonSingletons whether to include prototype or scoped beans too
     * or just singletons (also applies to FactoryBeans)
     * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
     * <i>objects created by FactoryBeans</i> (or by factory methods with a
     * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
     * eagerly initialized to determine their type: So be aware that passing in "true"
     * for this flag will initialize FactoryBeans and "factory-bean" references.
     * @return the names of beans (or objects created by FactoryBeans) matching
     * the given object type (including subclasses), or an empty array if none
     * @see FactoryBean#getObjectType
     * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)
     */
    String[] getBeanNamesForType(Class<?> type, boolean includeNonSingletons, boolean allowEagerInit);

    /**
     * Return the bean instances that match the given object type (including
     * subclasses), judging from either bean definitions or the value of
     * {@code getObjectType} in the case of FactoryBeans.
     * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
     * check nested beans which might match the specified type as well.
     * <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
     * will get initialized. If the object created by the FactoryBean doesn't match,
     * the raw FactoryBean itself will be matched against the type.
     * <p>Does not consider any hierarchy this factory may participate in.
     * Use BeanFactoryUtils' {@code beansOfTypeIncludingAncestors}
     * to include beans in ancestor factories too.
     * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
     * by other means than bean definitions.
     * <p>This version of getBeansOfType matches all kinds of beans, be it
     * singletons, prototypes, or FactoryBeans. In most implementations, the
     * result will be the same as for {@code getBeansOfType(type, true, true)}.
     * <p>The Map returned by this method should always return bean names and
     * corresponding bean instances <i>in the order of definition</i> in the
     * backend configuration, as far as possible.
     * @param type the class or interface to match, or {@code null} for all concrete beans
     * @return a Map with the matching beans, containing the bean names as
     * keys and the corresponding bean instances as values
     * @throws BeansException if a bean could not be created
     * @since 1.1.2
     * @see FactoryBean#getObjectType
     * @see BeanFactoryUtils#beansOfTypeIncludingAncestors(ListableBeanFactory, Class)
     */
    <T> Map<String, T> getBeansOfType(Class<T> type) throws BeansException;

    /**
     * Return the bean instances that match the given object type (including
     * subclasses), judging from either bean definitions or the value of
     * {@code getObjectType} in the case of FactoryBeans.
     * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
     * check nested beans which might match the specified type as well.
     * <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
     * which means that FactoryBeans will get initialized. If the object created by the
     * FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
     * type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
     * (which doesn't require initialization of each FactoryBean).
     * <p>Does not consider any hierarchy this factory may participate in.
     * Use BeanFactoryUtils' {@code beansOfTypeIncludingAncestors}
     * to include beans in ancestor factories too.
     * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
     * by other means than bean definitions.
     * <p>The Map returned by this method should always return bean names and
     * corresponding bean instances <i>in the order of definition</i> in the
     * backend configuration, as far as possible.
     * @param type the class or interface to match, or {@code null} for all concrete beans
     * @param includeNonSingletons whether to include prototype or scoped beans too
     * or just singletons (also applies to FactoryBeans)
     * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
     * <i>objects created by FactoryBeans</i> (or by factory methods with a
     * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
     * eagerly initialized to determine their type: So be aware that passing in "true"
     * for this flag will initialize FactoryBeans and "factory-bean" references.
     * @return a Map with the matching beans, containing the bean names as
     * keys and the corresponding bean instances as values
     * @throws BeansException if a bean could not be created
     * @see FactoryBean#getObjectType
     * @see BeanFactoryUtils#beansOfTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)
     */
    <T> Map<String, T> getBeansOfType(Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
            throws BeansException;

    /**
     * Find all names of beans whose {@code Class} has the supplied {@link Annotation}
     * type, without creating any bean instances yet.
     * @param annotationType the type of annotation to look for
     * @return the names of all matching beans
     * @since 4.0
     */
    String[] getBeanNamesForAnnotation(Class<? extends Annotation> annotationType);

    /**
     * Find all beans whose {@code Class} has the supplied {@link Annotation} type,
     * returning a Map of bean names with corresponding bean instances.
     * @param annotationType the type of annotation to look for
     * @return a Map with the matching beans, containing the bean names as
     * keys and the corresponding bean instances as values
     * @throws BeansException if a bean could not be created
     * @since 3.0
     */
    Map<String, Object> getBeansWithAnnotation(Class<? extends Annotation> annotationType) throws BeansException;

    /**
     * Find an {@link Annotation} of {@code annotationType} on the specified
     * bean, traversing its interfaces and super classes if no annotation can be
     * found on the given class itself.
     * @param beanName the name of the bean to look for annotations on
     * @param annotationType the annotation class to look for
     * @return the annotation of the given type if found, or {@code null}
     * @throws NoSuchBeanDefinitionException if there is no bean with the given name
     * @since 3.0
     */
    <A extends Annotation> A findAnnotationOnBean(String beanName, Class<A> annotationType)
            throws NoSuchBeanDefinitionException;

HierarchicalBeanFactory 是一个bean factory 子接口实现，可以作为层次结构的一部分。相对应的bean Factory方法setParentBeanFactory允许在一个可配置beanfactory中设置它们的父bean factory。

    /**
     * Return the parent bean factory, or {@code null} if there is none.
     */
    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
     */
    boolean containsLocalBean(String name);

AutowireCapableBeanFactory：beanFactory接口的扩展实现，假如它们想要对已经存在的bean暴露它的功能，实现它就能实现自动装配功能。

定义了将容器中的Bean按某种规则（如按名字匹配、按类型匹配等）进行自动装配的方法；

    /**
     * Constant that indicates no externally defined autowiring. Note that
     * BeanFactoryAware etc and annotation-driven injection will still be applied.
     * @see #createBean
     * @see #autowire
     * @see #autowireBeanProperties
     */
    int AUTOWIRE_NO = 0;

    /**
     * Constant that indicates autowiring bean properties by name
     * (applying to all bean property setters).
     * @see #createBean
     * @see #autowire
     * @see #autowireBeanProperties
     */
    int AUTOWIRE_BY_NAME = 1;

    /**
     * Constant that indicates autowiring bean properties by type
     * (applying to all bean property setters).
     * @see #createBean
     * @see #autowire
     * @see #autowireBeanProperties
     */
    int AUTOWIRE_BY_TYPE = 2;

    /**
     * Constant that indicates autowiring the greediest constructor that
     * can be satisfied (involves resolving the appropriate constructor).
     * @see #createBean
     * @see #autowire
     */
    int AUTOWIRE_CONSTRUCTOR = 3;

    /**
     * Constant that indicates determining an appropriate autowire strategy
     * through introspection of the bean class.
     * @see #createBean
     * @see #autowire
     * @deprecated as of Spring 3.0: If you are using mixed autowiring strategies,
     * prefer annotation-based autowiring for clearer demarcation of autowiring needs.
     */
    @Deprecated
    int AUTOWIRE_AUTODETECT = 4;

    //-------------------------------------------------------------------------
    // Typical methods for creating and populating external bean instances
    //-------------------------------------------------------------------------

    /**
     * Fully create a new bean instance of the given class.
     * <p>Performs full initialization of the bean, including all applicable
     * {@link BeanPostProcessor BeanPostProcessors}.
     * <p>Note: This is intended for creating a fresh instance, populating annotated
     * fields and methods as well as applying all standard bean initialiation callbacks.
     * It does <i>not</> imply traditional by-name or by-type autowiring of properties;
     * use {@link #createBean(Class, int, boolean)} for that purposes.
     * @param beanClass the class of the bean to create
     * @return the new bean instance
     * @throws BeansException if instantiation or wiring failed
     */
    <T> T createBean(Class<T> beanClass) throws BeansException;

    /**
     * Populate the given bean instance through applying after-instantiation callbacks
     * and bean property post-processing (e.g. for annotation-driven injection).
     * <p>Note: This is essentially intended for (re-)populating annotated fields and
     * methods, either for new instances or for deserialized instances. It does
     * <i>not</i> imply traditional by-name or by-type autowiring of properties;
     * use {@link #autowireBeanProperties} for that purposes.
     * @param existingBean the existing bean instance
     * @throws BeansException if wiring failed
     */
    void autowireBean(Object existingBean) throws BeansException;

    /**
     * Configure the given raw bean: autowiring bean properties, applying
     * bean property values, applying factory callbacks such as {@code setBeanName}
     * and {@code setBeanFactory}, and also applying all bean post processors
     * (including ones which might wrap the given raw bean).
     * <p>This is effectively a superset of what {@link #initializeBean} provides,
     * fully applying the configuration specified by the corresponding bean definition.
     * <b>Note: This method requires a bean definition for the given name!</b>
     * @param existingBean the existing bean instance
     * @param beanName the name of the bean, to be passed to it if necessary
     * (a bean definition of that name has to be available)
     * @return the bean instance to use, either the original or a wrapped one
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
     * if there is no bean definition with the given name
     * @throws BeansException if the initialization failed
     * @see #initializeBean
     */
    Object configureBean(Object existingBean, String beanName) throws BeansException;

    /**
     * Resolve the specified dependency against the beans defined in this factory.
     * @param descriptor the descriptor for the dependency
     * @param beanName the name of the bean which declares the present dependency
     * @return the resolved object, or {@code null} if none found
     * @throws BeansException in dependency resolution failed
     */
    Object resolveDependency(DependencyDescriptor descriptor, String beanName) throws BeansException;

    //-------------------------------------------------------------------------
    // Specialized methods for fine-grained control over the bean lifecycle
    //-------------------------------------------------------------------------

    /**
     * Fully create a new bean instance of the given class with the specified
     * autowire strategy. All constants defined in this interface are supported here.
     * <p>Performs full initialization of the bean, including all applicable
     * {@link BeanPostProcessor BeanPostProcessors}. This is effectively a superset
     * of what {@link #autowire} provides, adding {@link #initializeBean} behavior.
     * @param beanClass the class of the bean to create
     * @param autowireMode by name or type, using the constants in this interface
     * @param dependencyCheck whether to perform a dependency check for objects
     * (not applicable to autowiring a constructor, thus ignored there)
     * @return the new bean instance
     * @throws BeansException if instantiation or wiring failed
     * @see #AUTOWIRE_NO
     * @see #AUTOWIRE_BY_NAME
     * @see #AUTOWIRE_BY_TYPE
     * @see #AUTOWIRE_CONSTRUCTOR
     */
    Object createBean(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException;

    /**
     * Instantiate a new bean instance of the given class with the specified autowire
     * strategy. All constants defined in this interface are supported here.
     * Can also be invoked with {@code AUTOWIRE_NO} in order to just apply
     * before-instantiation callbacks (e.g. for annotation-driven injection).
     * <p>Does <i>not</i> apply standard {@link BeanPostProcessor BeanPostProcessors}
     * callbacks or perform any further initialization of the bean. This interface
     * offers distinct, fine-grained operations for those purposes, for example
     * {@link #initializeBean}. However, {@link InstantiationAwareBeanPostProcessor}
     * callbacks are applied, if applicable to the construction of the instance.
     * @param beanClass the class of the bean to instantiate
     * @param autowireMode by name or type, using the constants in this interface
     * @param dependencyCheck whether to perform a dependency check for object
     * references in the bean instance (not applicable to autowiring a constructor,
     * thus ignored there)
     * @return the new bean instance
     * @throws BeansException if instantiation or wiring failed
     * @see #AUTOWIRE_NO
     * @see #AUTOWIRE_BY_NAME
     * @see #AUTOWIRE_BY_TYPE
     * @see #AUTOWIRE_CONSTRUCTOR
     * @see #AUTOWIRE_AUTODETECT
     * @see #initializeBean
     * @see #applyBeanPostProcessorsBeforeInitialization
     * @see #applyBeanPostProcessorsAfterInitialization
     */
    Object autowire(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException;

    /**
     * Autowire the bean properties of the given bean instance by name or type.
     * Can also be invoked with {@code AUTOWIRE_NO} in order to just apply
     * after-instantiation callbacks (e.g. for annotation-driven injection).
     * <p>Does <i>not</i> apply standard {@link BeanPostProcessor BeanPostProcessors}
     * callbacks or perform any further initialization of the bean. This interface
     * offers distinct, fine-grained operations for those purposes, for example
     * {@link #initializeBean}. However, {@link InstantiationAwareBeanPostProcessor}
     * callbacks are applied, if applicable to the configuration of the instance.
     * @param existingBean the existing bean instance
     * @param autowireMode by name or type, using the constants in this interface
     * @param dependencyCheck whether to perform a dependency check for object
     * references in the bean instance
     * @throws BeansException if wiring failed
     * @see #AUTOWIRE_BY_NAME
     * @see #AUTOWIRE_BY_TYPE
     * @see #AUTOWIRE_NO
     */
    void autowireBeanProperties(Object existingBean, int autowireMode, boolean dependencyCheck)
            throws BeansException;

    /**
     * Apply the property values of the bean definition with the given name to
     * the given bean instance. The bean definition can either define a fully
     * self-contained bean, reusing its property values, or just property values
     * meant to be used for existing bean instances.
     * <p>This method does <i>not</i> autowire bean properties; it just applies
     * explicitly defined property values. Use the {@link #autowireBeanProperties}
     * method to autowire an existing bean instance.
     * <b>Note: This method requires a bean definition for the given name!</b>
     * <p>Does <i>not</i> apply standard {@link BeanPostProcessor BeanPostProcessors}
     * callbacks or perform any further initialization of the bean. This interface
     * offers distinct, fine-grained operations for those purposes, for example
     * {@link #initializeBean}. However, {@link InstantiationAwareBeanPostProcessor}
     * callbacks are applied, if applicable to the configuration of the instance.
     * @param existingBean the existing bean instance
     * @param beanName the name of the bean definition in the bean factory
     * (a bean definition of that name has to be available)
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
     * if there is no bean definition with the given name
     * @throws BeansException if applying the property values failed
     * @see #autowireBeanProperties
     */
    void applyBeanPropertyValues(Object existingBean, String beanName) throws BeansException;

    /**
     * Initialize the given raw bean, applying factory callbacks
     * such as {@code setBeanName} and {@code setBeanFactory},
     * also applying all bean post processors (including ones which
     * might wrap the given raw bean).
     * <p>Note that no bean definition of the given name has to exist
     * in the bean factory. The passed-in bean name will simply be used
     * for callbacks but not checked against the registered bean definitions.
     * @param existingBean the existing bean instance
     * @param beanName the name of the bean, to be passed to it if necessary
     * (only passed to {@link BeanPostProcessor BeanPostProcessors})
     * @return the bean instance to use, either the original or a wrapped one
     * @throws BeansException if the initialization failed
     */
    Object initializeBean(Object existingBean, String beanName) throws BeansException;

    /**
     * Apply {@link BeanPostProcessor BeanPostProcessors} to the given existing bean
     * instance, invoking their {@code postProcessBeforeInitialization} methods.
     * The returned bean instance may be a wrapper around the original.
     * @param existingBean the new bean instance
     * @param beanName the name of the bean
     * @return the bean instance to use, either the original or a wrapped one
     * @throws BeansException if any post-processing failed
     * @see BeanPostProcessor#postProcessBeforeInitialization
     */
    Object applyBeanPostProcessorsBeforeInitialization(Object existingBean, String beanName)
            throws BeansException;

    /**
     * Apply {@link BeanPostProcessor BeanPostProcessors} to the given existing bean
     * instance, invoking their {@code postProcessAfterInitialization} methods.
     * The returned bean instance may be a wrapper around the original.
     * @param existingBean the new bean instance
     * @param beanName the name of the bean
     * @return the bean instance to use, either the original or a wrapped one
     * @throws BeansException if any post-processing failed
     * @see BeanPostProcessor#postProcessAfterInitialization
     */
    Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName)
            throws BeansException;

    /**
     * Destroy the given bean instance (typically coming from {@link #createBean}),
     * applying the {@link org.springframework.beans.factory.DisposableBean} contract as well as
     * registered {@link DestructionAwareBeanPostProcessor DestructionAwareBeanPostProcessors}.
     * <p>Any exception that arises during destruction should be caught
     * and logged instead of propagated to the caller of this method.
     * @param existingBean the bean instance to destroy
     */
    void destroyBean(Object existingBean);

    /**
     * Resolve the specified dependency against the beans defined in this factory.
     * @param descriptor the descriptor for the dependency
     * @param beanName the name of the bean which declares the present dependency
     * @param autowiredBeanNames a Set that all names of autowired beans (used for
     * resolving the present dependency) are supposed to be added to
     * @param typeConverter the TypeConverter to use for populating arrays and
     * collections
     * @return the resolved object, or {@code null} if none found
     * @throws BeansException in dependency resolution failed
     */
    Object resolveDependency(DependencyDescriptor descriptor, String beanName,
            Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException;

其中：

HierarchicalBeanFactory的子接口

ConfigurableBeanFactory是一个配置接口，大部分beanFactory实现了这个接口。这个接口提供了对一个beanfactory进行配置的便利方法，加上beanFactory接口的客户端方法。增强了IoC容器的可定制性，它定义了设置类装载器、属性编辑器、容器初始化后置处理器等方法；

public interface ConfigurableBeanFactory extends HierarchicalBeanFactory, SingletonBeanRegistry {

    /**
     * Scope identifier for the standard singleton scope: "singleton".
     * Custom scopes can be added via {@code registerScope}.
     * @see #registerScope
     */
    String SCOPE_SINGLETON = "singleton";

    /**
     * Scope identifier for the standard prototype scope: "prototype".
     * Custom scopes can be added via {@code registerScope}.
     * @see #registerScope
     */
    String SCOPE_PROTOTYPE = "prototype";

    /**
     * Set the parent of this bean factory.
     * <p>Note that the parent cannot be changed: It should only be set outside
     * a constructor if it isn't available at the time of factory instantiation.
     * @param parentBeanFactory the parent BeanFactory
     * @throws IllegalStateException if this factory is already associated with
     * a parent BeanFactory
     * @see #getParentBeanFactory()
     */
    void setParentBeanFactory(BeanFactory parentBeanFactory) throws IllegalStateException;

    /**
     * Set the class loader to use for loading bean classes.
     * Default is the thread context class loader.
     * <p>Note that this class loader will only apply to bean definitions
     * that do not carry a resolved bean class yet. This is the case as of
     * Spring 2.0 by default: Bean definitions only carry bean class names,
     * to be resolved once the factory processes the bean definition.
     * @param beanClassLoader the class loader to use,
     * or {@code null} to suggest the default class loader
     */
    void setBeanClassLoader(ClassLoader beanClassLoader);

    /**
     * Return this factory's class loader for loading bean classes.
     */
    ClassLoader getBeanClassLoader();

    /**
     * Specify a temporary ClassLoader to use for type matching purposes.
     * Default is none, simply using the standard bean ClassLoader.
     * <p>A temporary ClassLoader is usually just specified if
     * <i>load-time weaving</i> is involved, to make sure that actual bean
     * classes are loaded as lazily as possible. The temporary loader is
     * then removed once the BeanFactory completes its bootstrap phase.
     * @since 2.5
     */
    void setTempClassLoader(ClassLoader tempClassLoader);

    /**
     * Return the temporary ClassLoader to use for type matching purposes,
     * if any.
     * @since 2.5
     */
    ClassLoader getTempClassLoader();

    /**
     * Set whether to cache bean metadata such as given bean definitions
     * (in merged fashion) and resolved bean classes. Default is on.
     * <p>Turn this flag off to enable hot-refreshing of bean definition objects
     * and in particular bean classes. If this flag is off, any creation of a bean
     * instance will re-query the bean class loader for newly resolved classes.
     */
    void setCacheBeanMetadata(boolean cacheBeanMetadata);

    /**
     * Return whether to cache bean metadata such as given bean definitions
     * (in merged fashion) and resolved bean classes.
     */
    boolean isCacheBeanMetadata();

    /**
     * Specify the resolution strategy for expressions in bean definition values.
     * <p>There is no expression support active in a BeanFactory by default.
     * An ApplicationContext will typically set a standard expression strategy
     * here, supporting "#{...}" expressions in a Unified EL compatible style.
     * @since 3.0
     */
    void setBeanExpressionResolver(BeanExpressionResolver resolver);

    /**
     * Return the resolution strategy for expressions in bean definition values.
     * @since 3.0
     */
    BeanExpressionResolver getBeanExpressionResolver();

    /**
     * Specify a Spring 3.0 ConversionService to use for converting
     * property values, as an alternative to JavaBeans PropertyEditors.
     * @since 3.0
     */
    void setConversionService(ConversionService conversionService);

    /**
     * Return the associated ConversionService, if any.
     * @since 3.0
     */
    ConversionService getConversionService();

    /**
     * Add a PropertyEditorRegistrar to be applied to all bean creation processes.
     * <p>Such a registrar creates new PropertyEditor instances and registers them
     * on the given registry, fresh for each bean creation attempt. This avoids
     * the need for synchronization on custom editors; hence, it is generally
     * preferable to use this method instead of {@link #registerCustomEditor}.
     * @param registrar the PropertyEditorRegistrar to register
     */
    void addPropertyEditorRegistrar(PropertyEditorRegistrar registrar);

    /**
     * Register the given custom property editor for all properties of the
     * given type. To be invoked during factory configuration.
     * <p>Note that this method will register a shared custom editor instance;
     * access to that instance will be synchronized for thread-safety. It is
     * generally preferable to use {@link #addPropertyEditorRegistrar} instead
     * of this method, to avoid for the need for synchronization on custom editors.
     * @param requiredType type of the property
     * @param propertyEditorClass the {@link PropertyEditor} class to register
     */
    void registerCustomEditor(Class<?> requiredType, Class<? extends PropertyEditor> propertyEditorClass);

    /**
     * Initialize the given PropertyEditorRegistry with the custom editors
     * that have been registered with this BeanFactory.
     * @param registry the PropertyEditorRegistry to initialize
     */
    void copyRegisteredEditorsTo(PropertyEditorRegistry registry);

    /**
     * Set a custom type converter that this BeanFactory should use for converting
     * bean property values, constructor argument values, etc.
     * <p>This will override the default PropertyEditor mechanism and hence make
     * any custom editors or custom editor registrars irrelevant.
     * @see #addPropertyEditorRegistrar
     * @see #registerCustomEditor
     * @since 2.5
     */
    void setTypeConverter(TypeConverter typeConverter);

    /**
     * Obtain a type converter as used by this BeanFactory. This may be a fresh
     * instance for each call, since TypeConverters are usually <i>not</i> thread-safe.
     * <p>If the default PropertyEditor mechanism is active, the returned
     * TypeConverter will be aware of all custom editors that have been registered.
     * @since 2.5
     */
    TypeConverter getTypeConverter();

    /**
     * Add a String resolver for embedded values such as annotation attributes.
     * @param valueResolver the String resolver to apply to embedded values
     * @since 3.0
     */
    void addEmbeddedValueResolver(StringValueResolver valueResolver);

    /**
     * Resolve the given embedded value, e.g. an annotation attribute.
     * @param value the value to resolve
     * @return the resolved value (may be the original value as-is)
     * @since 3.0
     */
    String resolveEmbeddedValue(String value);

    /**
     * Add a new BeanPostProcessor that will get applied to beans created
     * by this factory. To be invoked during factory configuration.
     * <p>Note: Post-processors submitted here will be applied in the order of
     * registration; any ordering semantics expressed through implementing the
     * {@link org.springframework.core.Ordered} interface will be ignored. Note
     * that autodetected post-processors (e.g. as beans in an ApplicationContext)
     * will always be applied after programmatically registered ones.
     * @param beanPostProcessor the post-processor to register
     */
    void addBeanPostProcessor(BeanPostProcessor beanPostProcessor);

    /**
     * Return the current number of registered BeanPostProcessors, if any.
     */
    int getBeanPostProcessorCount();

    /**
     * Register the given scope, backed by the given Scope implementation.
     * @param scopeName the scope identifier
     * @param scope the backing Scope implementation
     */
    void registerScope(String scopeName, Scope scope);

    /**
     * Return the names of all currently registered scopes.
     * <p>This will only return the names of explicitly registered scopes.
     * Built-in scopes such as "singleton" and "prototype" won't be exposed.
     * @return the array of scope names, or an empty array if none
     * @see #registerScope
     */
    String[] getRegisteredScopeNames();

    /**
     * Return the Scope implementation for the given scope name, if any.
     * <p>This will only return explicitly registered scopes.
     * Built-in scopes such as "singleton" and "prototype" won't be exposed.
     * @param scopeName the name of the scope
     * @return the registered Scope implementation, or {@code null} if none
     * @see #registerScope
     */
    Scope getRegisteredScope(String scopeName);

    /**
     * Provides a security access control context relevant to this factory.
     * @return the applicable AccessControlContext (never {@code null})
     * @since 3.0
     */
    AccessControlContext getAccessControlContext();

    /**
     * Copy all relevant configuration from the given other factory.
     * <p>Should include all standard configuration settings as well as
     * BeanPostProcessors, Scopes, and factory-specific internal settings.
     * Should not include any metadata of actual bean definitions,
     * such as BeanDefinition objects and bean name aliases.
     * @param otherFactory the other BeanFactory to copy from
     */
    void copyConfigurationFrom(ConfigurableBeanFactory otherFactory);

    /**
     * Given a bean name, create an alias. We typically use this method to
     * support names that are illegal within XML ids (used for bean names).
     * <p>Typically invoked during factory configuration, but can also be
     * used for runtime registration of aliases. Therefore, a factory
     * implementation should synchronize alias access.
     * @param beanName the canonical name of the target bean
     * @param alias the alias to be registered for the bean
     * @throws BeanDefinitionStoreException if the alias is already in use
     */
    void registerAlias(String beanName, String alias) throws BeanDefinitionStoreException;

    /**
     * Resolve all alias target names and aliases registered in this
     * factory, applying the given StringValueResolver to them.
     * <p>The value resolver may for example resolve placeholders
     * in target bean names and even in alias names.
     * @param valueResolver the StringValueResolver to apply
     * @since 2.5
     */
    void resolveAliases(StringValueResolver valueResolver);

    /**
     * Return a merged BeanDefinition for the given bean name,
     * merging a child bean definition with its parent if necessary.
     * Considers bean definitions in ancestor factories as well.
     * @param beanName the name of the bean to retrieve the merged definition for
     * @return a (potentially merged) BeanDefinition for the given bean
     * @throws NoSuchBeanDefinitionException if there is no bean definition with the given name
     * @since 2.5
     */
    BeanDefinition getMergedBeanDefinition(String beanName) throws NoSuchBeanDefinitionException;

    /**
     * Determine whether the bean with the given name is a FactoryBean.
     * @param name the name of the bean to check
     * @return whether the bean is a FactoryBean
     * ({@code false} means the bean exists but is not a FactoryBean)
     * @throws NoSuchBeanDefinitionException if there is no bean with the given name
     * @since 2.5
     */
    boolean isFactoryBean(String name) throws NoSuchBeanDefinitionException;

    /**
     * Explicitly control the current in-creation status of the specified bean.
     * For container-internal use only.
     * @param beanName the name of the bean
     * @param inCreation whether the bean is currently in creation
     * @since 3.1
     */
    void setCurrentlyInCreation(String beanName, boolean inCreation);

    /**
     * Determine whether the specified bean is currently in creation.
     * @param beanName the name of the bean
     * @return whether the bean is currently in creation
     * @since 2.5
     */
    boolean isCurrentlyInCreation(String beanName);

    /**
     * Register a dependent bean for the given bean,
     * to be destroyed before the given bean is destroyed.
     * @param beanName the name of the bean
     * @param dependentBeanName the name of the dependent bean
     * @since 2.5
     */
    void registerDependentBean(String beanName, String dependentBeanName);

    /**
     * Return the names of all beans which depend on the specified bean, if any.
     * @param beanName the name of the bean
     * @return the array of dependent bean names, or an empty array if none
     * @since 2.5
     */
    String[] getDependentBeans(String beanName);

    /**
     * Return the names of all beans that the specified bean depends on, if any.
     * @param beanName the name of the bean
     * @return the array of names of beans which the bean depends on,
     * or an empty array if none
     * @since 2.5
     */
    String[] getDependenciesForBean(String beanName);

    /**
     * Destroy the given bean instance (usually a prototype instance
     * obtained from this factory) according to its bean definition.
     * <p>Any exception that arises during destruction should be caught
     * and logged instead of propagated to the caller of this method.
     * @param beanName the name of the bean definition
     * @param beanInstance the bean instance to destroy
     */
    void destroyBean(String beanName, Object beanInstance);

    /**
     * Destroy the specified scoped bean in the current target scope, if any.
     * <p>Any exception that arises during destruction should be caught
     * and logged instead of propagated to the caller of this method.
     * @param beanName the name of the scoped bean
     */
    void destroyScopedBean(String beanName);

    /**
     * Destroy all singleton beans in this factory, including inner beans that have
     * been registered as disposable. To be called on shutdown of a factory.
     * <p>Any exception that arises during destruction should be caught
     * and logged instead of propagated to the caller of this method.
     */
    void destroySingletons();

}

ConfigurableListableBeanFactory 它同时继承了ListableBeanFactory，AutowireCapableBeanFactory和ConfigurableBeanFactory，提供了对bean定义的分析和修改的便利方法，同时也提供了对单例的预实例化。

public interface ConfigurableListableBeanFactory
        extends ListableBeanFactory, AutowireCapableBeanFactory, ConfigurableBeanFactory {

    /**
     * Ignore the given dependency type for autowiring:
     * for example, String. Default is none.
     * @param type the dependency type to ignore
     */
    void ignoreDependencyType(Class<?> type);

    /**
     * Ignore the given dependency interface for autowiring.
     * <p>This will typically be used by application contexts to register
     * dependencies that are resolved in other ways, like BeanFactory through
     * BeanFactoryAware or ApplicationContext through ApplicationContextAware.
     * <p>By default, only the BeanFactoryAware interface is ignored.
     * For further types to ignore, invoke this method for each type.
     * @param ifc the dependency interface to ignore
     * @see org.springframework.beans.factory.BeanFactoryAware
     * @see org.springframework.context.ApplicationContextAware
     */
    void ignoreDependencyInterface(Class<?> ifc);

    /**
     * Register a special dependency type with corresponding autowired value.
     * <p>This is intended for factory/context references that are supposed
     * to be autowirable but are not defined as beans in the factory:
     * e.g. a dependency of type ApplicationContext resolved to the
     * ApplicationContext instance that the bean is living in.
     * <p>Note: There are no such default types registered in a plain BeanFactory,
     * not even for the BeanFactory interface itself.
     * @param dependencyType the dependency type to register. This will typically
     * be a base interface such as BeanFactory, with extensions of it resolved
     * as well if declared as an autowiring dependency (e.g. ListableBeanFactory),
     * as long as the given value actually implements the extended interface.
     * @param autowiredValue the corresponding autowired value. This may also be an
     * implementation of the {@link org.springframework.beans.factory.ObjectFactory}
     * interface, which allows for lazy resolution of the actual target value.
     */
    void registerResolvableDependency(Class<?> dependencyType, Object autowiredValue);

    /**
     * Determine whether the specified bean qualifies as an autowire candidate,
     * to be injected into other beans which declare a dependency of matching type.
     * <p>This method checks ancestor factories as well.
     * @param beanName the name of the bean to check
     * @param descriptor the descriptor of the dependency to resolve
     * @return whether the bean should be considered as autowire candidate
     * @throws NoSuchBeanDefinitionException if there is no bean with the given name
     */
    boolean isAutowireCandidate(String beanName, DependencyDescriptor descriptor)
            throws NoSuchBeanDefinitionException;

    /**
     * Return the registered BeanDefinition for the specified bean, allowing access
     * to its property values and constructor argument value (which can be
     * modified during bean factory post-processing).
     * <p>A returned BeanDefinition object should not be a copy but the original
     * definition object as registered in the factory. This means that it should
     * be castable to a more specific implementation type, if necessary.
     * <p><b>NOTE:</b> This method does <i>not</i> consider ancestor factories.
     * It is only meant for accessing local bean definitions of this factory.
     * @param beanName the name of the bean
     * @return the registered BeanDefinition
     * @throws NoSuchBeanDefinitionException if there is no bean with the given name
     * defined in this factory
     */
    BeanDefinition getBeanDefinition(String beanName) throws NoSuchBeanDefinitionException;

    /**
     * Freeze all bean definitions, signalling that the registered bean definitions
     * will not be modified or post-processed any further.
     * <p>This allows the factory to aggressively cache bean definition metadata.
     */
    void freezeConfiguration();

    /**
     * Return whether this factory's bean definitions are frozen,
     * i.e. are not supposed to be modified or post-processed any further.
     * @return {@code true} if the factory's configuration is considered frozen
     */
    boolean isConfigurationFrozen();

    /**
     * Ensure that all non-lazy-init singletons are instantiated, also considering
     * {@link org.springframework.beans.factory.FactoryBean FactoryBeans}.
     * Typically invoked at the end of factory setup, if desired.
     * @throws BeansException if one of the singleton beans could not be created.
     * Note: This may have left the factory with some beans already initialized!
     * Call {@link #destroySingletons()} for full cleanup in this case.
     * @see #destroySingletons()
     */
    void preInstantiateSingletons() throws BeansException;

}

小结：

1. beanFactory有四个子接口，添加了四种不同的能力，分别是：

SimpleJndiBeanFactory：支持jndi。

AutowireCapableBeanFactory：支持自动装配。

HierarchicalBeanFactory：支持层次结构，ConfigurableListableBeanFactory实现了HierarchicalBeanFactory，提供了可配置功能。

ListableBeanFactory：支持枚举。

2. bean经过两次进化，到了DefaultListableBeanFactory，完善了bean容器的功能。

DefaultListableBeanFactory实现了AbstractAutowireCapableBeanFactory,ConfigurableListableBeanFactory, BeanDefinitionRegistry, Serializable等多个接口。

3.最终进化：

XmlBeanFactory 通过从xml文件中读取bean的定义和依赖。

下一节，重点了解AbstractAutowireCapableBeanFactory，BeanDefinitionRegistry接口，全面了解bean factory的完整进化历史。