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.Services;
021    
022    import javax.servlet.ServletContextListener;
023    import javax.servlet.ServletContextEvent;
024    
025    /**
026     * Webapp context listener that initializes Oozie {@link Services}.
027     */
028    public class ServicesLoader implements ServletContextListener {
029        private static Services services;
030    
031        /**
032         * Initialize Oozie services.
033         *
034         * @param event context event.
035         */
036        public void contextInitialized(ServletContextEvent event) {
037            try {
038                services = new Services();
039                services.init();
040            }
041            catch (Throwable ex) {
042                System.out.println();
043                System.out.println("ERROR: Oozie could not be started");
044                System.out.println();
045                System.out.println("REASON: " + ex.toString());
046                System.out.println();
047                System.out.println("Stacktrace:");
048                System.out.println("-----------------------------------------------------------------");
049                ex.printStackTrace(System.out);
050                System.out.println("-----------------------------------------------------------------");
051                System.out.println();
052                System.exit(1);
053            }
054        }
055    
056        /**
057         * Destroy Oozie services.
058         *
059         * @param event context event.
060         */
061        public void contextDestroyed(ServletContextEvent event) {
062            services.destroy();
063        }
064    
065    }