Java tutorial
/* * Copyright 2002-2018 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 java.io.Closeable; import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanFactoryPostProcessor; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.core.env.Environment; import org.springframework.core.io.ProtocolResolver; import org.springframework.lang.Nullable; /** * SPI interface to be implemented by most if not all application contexts. * Provides facilities to configure an application context in addition * to the application context client methods in the * {@link org.springframework.context.ApplicationContext} interface. * * <p>Configuration and lifecycle methods are encapsulated here to avoid * making them obvious to ApplicationContext client code. The present * methods should only be used by startup and shutdown code. * * @author Juergen Hoeller * @author Chris Beams * @since 03.11.2003 */ public interface ConfigurableApplicationContext extends ApplicationContext, Lifecycle, Closeable { /** * Any number of these characters are considered delimiters between * multiple context config paths in a single String value. * @see org.springframework.context.support.AbstractXmlApplicationContext#setConfigLocation * @see org.springframework.web.context.ContextLoader#CONFIG_LOCATION_PARAM * @see org.springframework.web.servlet.FrameworkServlet#setContextConfigLocation */ String CONFIG_LOCATION_DELIMITERS = ",; \t\n"; /** * Name of the ConversionService bean in the factory. * If none is supplied, default conversion rules apply. * @since 3.0 * @see org.springframework.core.convert.ConversionService */ String CONVERSION_SERVICE_BEAN_NAME = "conversionService"; /** * Name of the LoadTimeWeaver bean in the factory. If such a bean is supplied, * the context will use a temporary ClassLoader for type matching, in order * to allow the LoadTimeWeaver to process all actual bean classes. * @since 2.5 * @see org.springframework.instrument.classloading.LoadTimeWeaver */ String LOAD_TIME_WEAVER_BEAN_NAME = "loadTimeWeaver"; /** * Name of the {@link Environment} bean in the factory. * @since 3.1 */ String ENVIRONMENT_BEAN_NAME = "environment"; /** * Name of the System properties bean in the factory. * @see java.lang.System#getProperties() */ String SYSTEM_PROPERTIES_BEAN_NAME = "systemProperties"; /** * Name of the System environment bean in the factory. * @see java.lang.System#getenv() */ String SYSTEM_ENVIRONMENT_BEAN_NAME = "systemEnvironment"; /** * Set the unique id of this application context. * @since 3.0 */ void setId(String id); /** * Set the parent of this application context. * <p>Note that the parent shouldn't be changed: It should only be set outside * a constructor if it isn't available when an object of this class is created, * for example in case of WebApplicationContext setup. * @param parent the parent context * @see org.springframework.web.context.ConfigurableWebApplicationContext */ void setParent(@Nullable ApplicationContext parent); /** * Set the {@code Environment} for this application context. * @param environment the new environment * @since 3.1 */ void setEnvironment(ConfigurableEnvironment environment); /** * Return the {@code Environment} for this application context in configurable * form, allowing for further customization. * @since 3.1 */ @Override ConfigurableEnvironment getEnvironment(); /** * Add a new BeanFactoryPostProcessor that will get applied to the internal * bean factory of this application context on refresh, before any of the * bean definitions get evaluated. To be invoked during context configuration. * @param postProcessor the factory processor to register */ void addBeanFactoryPostProcessor(BeanFactoryPostProcessor postProcessor); /** * Add a new ApplicationListener that will be notified on context events * such as context refresh and context shutdown. * <p>Note that any ApplicationListener registered here will be applied * on refresh if the context is not active yet, or on the fly with the * current event multicaster in case of a context that is already active. * @param listener the ApplicationListener to register * @see org.springframework.context.event.ContextRefreshedEvent * @see org.springframework.context.event.ContextClosedEvent */ void addApplicationListener(ApplicationListener<?> listener); /** * Register the given protocol resolver with this application context, * allowing for additional resource protocols to be handled. * <p>Any such resolver will be invoked ahead of this context's standard * resolution rules. It may therefore also override any default rules. * @since 4.3 */ void addProtocolResolver(ProtocolResolver resolver); /** * Load or refresh the persistent representation of the configuration, * which might an XML file, properties file, or relational database schema. * <p>As this is a startup method, it should destroy already created singletons * if it fails, to avoid dangling resources. In other words, after invocation * of that method, either all or no singletons at all should be instantiated. * @throws BeansException if the bean factory could not be initialized * @throws IllegalStateException if already initialized and multiple refresh * attempts are not supported */ void refresh() throws BeansException, IllegalStateException; /** * Register a shutdown hook with the JVM runtime, closing this context * on JVM shutdown unless it has already been closed at that time. * <p>This method can be called multiple times. Only one shutdown hook * (at max) will be registered for each context instance. * @see java.lang.Runtime#addShutdownHook * @see #close() */ void registerShutdownHook(); /** * Close this application context, releasing all resources and locks that the * implementation might hold. This includes destroying all cached singleton beans. * <p>Note: Does <i>not</i> invoke {@code close} on a parent context; * parent contexts have their own, independent lifecycle. * <p>This method can be called multiple times without side effects: Subsequent * {@code close} calls on an already closed context will be ignored. */ @Override void close(); /** * Determine whether this application context is active, that is, * whether it has been refreshed at least once and has not been closed yet. * @return whether the context is still active * @see #refresh() * @see #close() * @see #getBeanFactory() */ boolean isActive(); /** * Return the internal bean factory of this application context. * Can be used to access specific functionality of the underlying factory. * <p>Note: Do not use this to post-process the bean factory; singletons * will already have been instantiated before. Use a BeanFactoryPostProcessor * to intercept the BeanFactory setup process before beans get touched. * <p>Generally, this internal factory will only be accessible while the context * is active, that is, in-between {@link #refresh()} and {@link #close()}. * The {@link #isActive()} flag can be used to check whether the context * is in an appropriate state. * @return the underlying bean factory * @throws IllegalStateException if the context does not hold an internal * bean factory (usually if {@link #refresh()} hasn't been called yet or * if {@link #close()} has already been called) * @see #isActive() * @see #refresh() * @see #close() * @see #addBeanFactoryPostProcessor */ ConfigurableListableBeanFactory getBeanFactory() throws IllegalStateException; }