對於想要擁有自動裝配能力，並且想把這種能力暴露給外部應用的BeanFactory類需要實現此接口。
正常情況下，不要使用此接口，應該更傾向於使用BeanFactory或者ListableBeanFactory接口。此接口主要是針對框架之外，沒有向Spring託管Bean的應用。通過暴露此功能，Spring框架之外的程序，具有自動裝配等Spring的功能。
需要注意的是，ApplicationContext接口並沒有實現此接口，因爲應用代碼很少用到此功能，如果確實需要的話，可以調用ApplicationContext的getAutowireCapableBeanFactory方法，來獲取此接口的實例。
===================================以下中文版==================================================
如果一個類實現了此接口，那麼很大程度上它還需要實現BeanFactoryAware接口。它可以在應用上下文中返回BeanFactory。
public interface AutowireCapableBeanFactory extends BeanFactory {
/**
* 常量，用於標識外部自動裝配功能是否可用。但是此標識不影響正常的（基於註解的等）自動裝配功能的使用
*/
int AUTOWIRE_NO = 0;
/**
* 標識按名裝配的常量
*/
int AUTOWIRE_BY_NAME = 1;
/**
* 標識按類型自動裝配的常量
*/
int AUTOWIRE_BY_TYPE = 2;
/**
* 標識按照貪婪策略匹配出的最符合的構造方法來自動裝配的常量
*/
int AUTOWIRE_CONSTRUCTOR = 3;
/**
* 標識自動識別一種裝配策略來實現自動裝配的常量
*/
@Deprecated
int AUTOWIRE_AUTODETECT = 4;
/**
* 創建一個給定Class的實例。
* 執行此Bean所有的關於Bean生命週期的接口方法如BeanPostProcessor
* 此方法用於創建一個新實例，它會處理各種帶有註解的域和方法，並且會調用所有Bean初始化時所需要調用的回調函數
* 此方法並不意味着by-name或者by-type方式的自動裝配，如果需要使用這寫功能，可以使用其重載方法
*/
<T> T createBean(Class<T> beanClass) throws BeansException;
/**
* Populate the given bean instance through applying after-instantiation callbacks
* 通過調用給定Bean的after-instantiation及post-processing接口，對bean進行配置。
* 此方法主要是用於處理Bean中帶有註解的域和方法。
* 此方法並不意味着by-name或者by-type方式的自動裝配，如果需要使用這寫功能，可以使用其重載方法autowireBeanProperties
*/
void autowireBean(Object existingBean) throws BeansException;
/**
* Configure the given raw bean: autowiring bean properties, applying
* 配置參數中指定的bean，包括自動裝配其域，對其應用如setBeanName功能的回調函數。
* 並且會調用其所有註冊的post processor.
* 此方法提供的功能是initializeBean方法的超集，會應用所有註冊在bean definenition中的操作。
* 不過需要BeanFactory 中有參數中指定名字的BeanDefinition。
*/
Object configureBean(Object existingBean, String beanName) throws BeansException;
/**
* 創建一個指定class的實例，通過參數可以指定其自動裝配模式（by-name or by-type）.
* 會執行所有註冊在此class上用以初始化bean的方法，如BeanPostProcessors等
*/
Object createBean(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException;
/**
* 通過指定的自動裝配策略來初始化一個Bean。
* 此方法不會調用Bean上註冊的諸如BeanPostProcessors的回調方法
*/
Object autowire(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException;
/**
* 通過指定的自動裝配方式來對給定的Bean進行自動裝配。
* 不過會調用指定Bean註冊的BeanPostProcessors等回調函數來初始化Bean。
* 如果指定裝配方式爲AUTOWIRE_NO的話，不會自動裝配屬性，但是依然會調用BeanPiostProcesser等回調方法。
*/
void autowireBeanProperties(Object existingBean, int autowireMode, boolean dependencyCheck)
throws BeansException;
/**
* 將參數中指定了那麼的Bean，注入給定實例當中
* 此方法不會自動注入Bean的屬性，它僅僅會應用在顯式定義的屬性之上。如果需要自動注入Bean屬性，使用
* autowireBeanProperties方法。
* 此方法需要BeanFactory中存在指定名字的Bean。除了InstantiationAwareBeanPostProcessor的回調方法外，
* 此方法不會在Bean上應用其它的例如BeanPostProcessors
* 等回調方法。不過可以調用其他諸如initializeBean等方法來達到目的。
*/
void applyBeanPropertyValues(Object existingBean, String beanName) throws BeansException;
/**
* 初始化參數中指定的Bean，調用任何其註冊的回調函數如setBeanName、setBeanFactory等。
* 另外還會調用此Bean上的所有postProcessors 方法
*/
Object initializeBean(Object existingBean, String beanName) throws BeansException;
/**
* 調用參數中指定Bean的postProcessBeforeInitialization方法
*/
Object applyBeanPostProcessorsBeforeInitialization(Object existingBean, String beanName)
throws BeansException;
/**
* 調用參數中指定Bean的postProcessAfterInitialization方法
*/
Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName)
throws BeansException;
/**
* 銷燬參數中指定的Bean，同時調用此Bean上的DisposableBean和DestructionAwareBeanPostProcessors方法
* 在銷燬途中，任何的異常情況都只應該被直接捕獲和記錄，而不應該向外拋出。
*/
void destroyBean(Object existingBean);
/**
* 查找唯一符合指定類的實例，如果有，則返回實例的名字和實例本身
* 和BeanFactory中的getBean(Class)方法類似，只不過多加了一個bean的名字
*/
<T> NamedBeanHolder<T> resolveNamedBean(Class<T> requiredType) throws BeansException;
/**
* 解析出在Factory中與指定Bean有指定依賴關係的Bean
* 參數建下一個方法
*/
Object resolveDependency(DependencyDescriptor descriptor, String requestingBeanName) throws BeansException;
/**
* 解析指定Bean在Factory中的依賴關係
* @param descriptor 依賴描述 (field/method/constructor)
* @param requestingBeanName 依賴描述所屬的Bean
* @param autowiredBeanNames 與指定Bean有依賴關係的Bean
* @param typeConverter 用以轉換數組和連表的轉換器
* @return the 解析結果，可能爲null
*/
Object resolveDependency(DependencyDescriptor descriptor, String requestingBeanName,
Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException;
==========================以下英文版==================================
/*
* Copyright 2002-2013 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.factory.config;
import java.util.Set;
import org.springframework.beans.BeansException;
import org.springframework.beans.TypeConverter;
import org.springframework.beans.factory.BeanFactory;
/**
* Extension of the {@link org.springframework.beans.factory.BeanFactory}
* interface to be implemented by bean factories that are capable of
* autowiring, provided that they want to expose this functionality for
* existing bean instances.
*
* <p>This subinterface of BeanFactory is not meant to be used in normal
* application code: stick to {@link org.springframework.beans.factory.BeanFactory}
* or {@link org.springframework.beans.factory.ListableBeanFactory} for
* typical use cases.
*
* <p>Integration code for other frameworks can leverage this interface to
* wire and populate existing bean instances that Spring does not control
* the lifecycle of. This is particularly useful for WebWork Actions and
* Tapestry Page objects, for example.
*
* <p>Note that this interface is not implemented by
* {@link org.springframework.context.ApplicationContext} facades,
* as it is hardly ever used by application code. That said, it is available
* from an application context too, accessible through ApplicationContext's
* {@link org.springframework.context.ApplicationContext#getAutowireCapableBeanFactory()}
* method.
*
* <p>You may also implement the {@link org.springframework.beans.factory.BeanFactoryAware}
* interface, which exposes the internal BeanFactory even when running in an
* ApplicationContext, to get access to an AutowireCapableBeanFactory:
* simply cast the passed-in BeanFactory to AutowireCapableBeanFactory.
*
* @author Juergen Hoeller
* @since 04.12.2003
* @see org.springframework.beans.factory.BeanFactoryAware
* @see org.springframework.beans.factory.config.ConfigurableListableBeanFactory
* @see org.springframework.context.ApplicationContext#getAutowireCapableBeanFactory()
*/
public interface AutowireCapableBeanFactory extends BeanFactory {
/**
* 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;
}