001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     * 
010     *      http://www.apache.org/licenses/LICENSE-2.0
011     * 
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.oozie.servlet;
019    
020    import org.apache.oozie.service.ServiceException;
021    import org.apache.oozie.service.Services;
022    
023    import javax.servlet.ServletContextListener;
024    import javax.servlet.ServletContextEvent;
025    
026    /**
027     * Webapp context listener that initializes Oozie {@link Services}.
028     */
029    public class ServicesLoader implements ServletContextListener {
030        private static Services services;
031    
032        /**
033         * Initialize Oozie services.
034         *
035         * @param event context event.
036         */
037        public void contextInitialized(ServletContextEvent event) {
038            try {
039                services = new Services();
040                services.init();
041            }
042            catch (ServiceException ex) {
043                throw new RuntimeException(ex);
044            }
045        }
046    
047        /**
048         * Destroy Oozie services.
049         *
050         * @param event context event.
051         */
052        public void contextDestroyed(ServletContextEvent event) {
053            services.destroy();
054        }
055    
056    }