001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.beans.factory.config;
018
019import org.springframework.beans.BeansException;
020
021/**
022 * Allows for custom modification of an application context's bean definitions,
023 * adapting the bean property values of the context's underlying bean factory.
024 *
025 * <p>Application contexts can auto-detect BeanFactoryPostProcessor beans in
026 * their bean definitions and apply them before any other beans get created.
027 *
028 * <p>Useful for custom config files targeted at system administrators that
029 * override bean properties configured in the application context.
030 *
031 * <p>See PropertyResourceConfigurer and its concrete implementations
032 * for out-of-the-box solutions that address such configuration needs.
033 *
034 * <p>A BeanFactoryPostProcessor may interact with and modify bean
035 * definitions, but never bean instances. Doing so may cause premature bean
036 * instantiation, violating the container and causing unintended side-effects.
037 * If bean instance interaction is required, consider implementing
038 * {@link BeanPostProcessor} instead.
039 *
040 * @author Juergen Hoeller
041 * @since 06.07.2003
042 * @see BeanPostProcessor
043 * @see PropertyResourceConfigurer
044 */
045public interface BeanFactoryPostProcessor {
046
047        /**
048         * Modify the application context's internal bean factory after its standard
049         * initialization. All bean definitions will have been loaded, but no beans
050         * will have been instantiated yet. This allows for overriding or adding
051         * properties even to eager-initializing beans.
052         * @param beanFactory the bean factory used by the application context
053         * @throws org.springframework.beans.BeansException in case of errors
054         */
055        void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException;
056
057}