001/*
002 * Copyright 2002-2016 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.web.context.support;
018
019import java.util.Enumeration;
020import java.util.LinkedHashSet;
021import java.util.Set;
022
023import javax.servlet.ServletContext;
024
025import org.springframework.context.ConfigurableApplicationContext;
026import org.springframework.context.support.LiveBeansView;
027import org.springframework.util.Assert;
028
029/**
030 * {@link LiveBeansView} subclass which looks for all ApplicationContexts
031 * in the web application, as exposed in ServletContext attributes.
032 *
033 * @author Juergen Hoeller
034 * @since 3.2
035 */
036public class ServletContextLiveBeansView extends LiveBeansView {
037
038        private final ServletContext servletContext;
039
040        /**
041         * Create a new LiveBeansView for the given ServletContext.
042         * @param servletContext current ServletContext
043         */
044        public ServletContextLiveBeansView(ServletContext servletContext) {
045                Assert.notNull(servletContext, "ServletContext must not be null");
046                this.servletContext = servletContext;
047        }
048
049        @Override
050        protected Set<ConfigurableApplicationContext> findApplicationContexts() {
051                Set<ConfigurableApplicationContext> contexts = new LinkedHashSet<>();
052                Enumeration<String> attrNames = this.servletContext.getAttributeNames();
053                while (attrNames.hasMoreElements()) {
054                        String attrName = attrNames.nextElement();
055                        Object attrValue = this.servletContext.getAttribute(attrName);
056                        if (attrValue instanceof ConfigurableApplicationContext) {
057                                contexts.add((ConfigurableApplicationContext) attrValue);
058                        }
059                }
060                return contexts;
061        }
062
063}