001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.servlet;
016    
017    import org.apache.oozie.service.ServiceException;
018    import org.apache.oozie.service.Services;
019    
020    import javax.servlet.ServletContextListener;
021    import javax.servlet.ServletContextEvent;
022    
023    /**
024     * Webapp context listener that initializes Oozie {@link Services}.
025     */
026    public class ServicesLoader implements ServletContextListener {
027        private static Services services;
028    
029        /**
030         * Initialize Oozie services.
031         *
032         * @param event context event.
033         */
034        public void contextInitialized(ServletContextEvent event) {
035            try {
036                services = new Services();
037                services.init();
038            }
039            catch (ServiceException ex) {
040                throw new RuntimeException(ex);
041            }
042        }
043    
044        /**
045         * Destroy Oozie services.
046         *
047         * @param event context event.
048         */
049        public void contextDestroyed(ServletContextEvent event) {
050            services.destroy();
051        }
052    
053    }