/* * Copyright 2002-2014 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 * * https://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.context; import org.springframework.beans.factory.HierarchicalBeanFactory; import org.springframework.beans.factory.ListableBeanFactory; import org.springframework.beans.factory.config.AutowireCapableBeanFactory; import org.springframework.core.env.EnvironmentCapable; import org.springframework.core.io.support.ResourcePatternResolver; import org.springframework.lang.Nullable; /** * Central interface to provide configuration for an application. * This is read-only while the application is running, but may be * reloaded if the implementation supports this. * 为应用程序提供配置的中央接口 * 在应用程序运行时,这是只读的,但是如果实现支持这个接口,则可以重新加载. * * <p>An ApplicationContext provides: * 一个ApplicationContext提供以下的功能: * <ul> * <li>Bean factory methods for accessing application components. * 用于访问应用程序组件的Bean工厂方法. * Inherited from {@link org.springframework.beans.factory.ListableBeanFactory}. * <li>The ability to load file resources in a generic fashion. * 以通用方式加载资源文件的能力 * Inherited from the {@link org.springframework.core.io.ResourceLoader} interface. * <li>The ability to publish events to registered listeners. * 将事件发布到注册侦听器的能力 * Inherited from the {@link ApplicationEventPublisher} interface. * <li>The ability to resolve messages, supporting internationalization. * 解析消息的能力,支持国际化. * Inherited from the {@link MessageSource} interface. * <li>Inheritance from a parent context. Definitions in a descendant context * will always take priority. This means, for example, that a single parent * context can be used by an entire web application, while each servlet has * its own child context that is independent of that of any other servlet. * 从父上下文继承,在后代上下文中的定义将始终处于优先级.例如,这意味着单个父上下文可以被整个web应用程序使用, * 而每个servlet都有自己独立于任何其他servlet的子上下文. * </ul> * * <p>In addition to standard {@link org.springframework.beans.factory.BeanFactory} * lifecycle capabilities, ApplicationContext implementations detect and invoke * {@link ApplicationContextAware} beans as well as {@link ResourceLoaderAware}, * {@link ApplicationEventPublisherAware} and {@link MessageSourceAware} beans. * 除了标准的BeanFactory生命周期功能,ApplicationContext实现检测和调用{ApplicationContextAware}bean以及 * {ResourceLoaderAware},{ApplicationEventPublisherAware}和{MessageSourceAware}的beans. * @author Rod Johnson * @author Juergen Hoeller * @see ConfigurableApplicationContext * @see org.springframework.beans.factory.BeanFactory * @see org.springframework.core.io.ResourceLoader */ public interface ApplicationContext extends EnvironmentCapable, ListableBeanFactory, HierarchicalBeanFactory, MessageSource, ApplicationEventPublisher, ResourcePatternResolver { /** * Return the unique id of this application context. * 返回此应用程序上下文的唯一id. * @return the unique id of the context, or {@code null} if none */ @Nullable String getId(); /** * Return a name for the deployed application that this context belongs to. * 返回此上下文所属的已部署的应用程序的名称 * @return a name for the deployed application, or the empty String by default */ String getApplicationName(); /** * Return a friendly name for this context. * 为这个上下文返回一个友好的名称 * @return a display name for this context (never {@code null}) */ String getDisplayName(); /** * Return the timestamp when this context was first loaded. * 返回第一次加载改上下文时的时间戳 * @return the timestamp (ms) when this context was first loaded */ long getStartupDate(); /** * Return the parent context, or {@code null} if there is no parent * and this is the root of the context hierarchy. * 返回父上下文,如果没有父上下文,并且这是上下文层次结构的根,则返回{null} * @return the parent context, or {@code null} if there is no parent */ @Nullable ApplicationContext getParent(); /** * Expose AutowireCapableBeanFactory functionality for this context. * 为此上下文公开AutowireCapableBeanFactory的功能 * * <p>This is not typically used by application code, except for the purpose of * initializing bean instances that live outside of the application context, * applying the Spring bean lifecycle (fully or partly) to them. * 这通常不被应用程序代码使用,除非是为了初始化位于应用程序上下文之外的bean实例. * 对它们应用Spring bean生命周期(全部或部分). * * <p>Alternatively, the internal BeanFactory exposed by the * {@link ConfigurableApplicationContext} interface offers access to the * {@link AutowireCapableBeanFactory} interface too. The present method mainly * serves as a convenient, specific facility on the ApplicationContext interface. * 另外,由{ConfigurableApplicationContext}接口公开的内部BeanFactory也提供对 * {AutowireCapableBeanFactory}接口的访问.本方法主要用于作为ApplicationContext接口上的一种方便的,特定的工具. * * <p><b>NOTE: As of 4.2, this method will consistently throw IllegalStateException * after the application context has been closed.</b> In current Spring Framework * versions, only refreshable application contexts behave that way; as of 4.2, * all application context implementations will be required to comply. * @return the AutowireCapableBeanFactory for this context * @throws IllegalStateException if the context does not support the * {@link AutowireCapableBeanFactory} interface, or does not hold an * autowire-capable bean factory yet (e.g. if {@code refresh()} has * never been called), or if the context has been closed already * @see ConfigurableApplicationContext#refresh() * @see ConfigurableApplicationContext#getBeanFactory() * 注意:从4.2版本开始,该方法将在应用程序上下文关闭后始终抛出IllegalStateException * 在当前的Spring框架版本中,只有可刷新的应用程序上下文才会有这种行为,从4.2开始, * 所有应用程序上下文都必须遵守. */ AutowireCapableBeanFactory getAutowireCapableBeanFactory() throws IllegalStateException; }