    001    package org.apache.turbine.services;
    002
    003
    004    /*
    005     * Licensed to the Apache Software Foundation (ASF) under one
    006     * or more contributor license agreements.  See the NOTICE file
    007     * distributed with this work for additional information
    008     * regarding copyright ownership.  The ASF licenses this file
    009     * to you under the Apache License, Version 2.0 (the
    010     * "License"); you may not use this file except in compliance
    011     * with the License.  You may obtain a copy of the License at
    012     *
    013     *   http://www.apache.org/licenses/LICENSE-2.0
    014     *
    015     * Unless required by applicable law or agreed to in writing,
    016     * software distributed under the License is distributed on an
    017     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    018     * KIND, either express or implied.  See the License for the
    019     * specific language governing permissions and limitations
    020     * under the License.
    021     */
    022
    023
    024    /**
    025     * This is a singleton utility class that acts as a Services broker.
    026     *
    027     * @author <a href="mailto:greg@shwoop.com">Greg Ritter</a>
    028     * @author <a href="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
    029     * @author <a href="mailto:burton@apache.org">Kevin Burton</a>
    030     * @author <a href="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
    031     * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
    032     * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
    033     * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    034     * @version $Id: TurbineServices.java 615328 2008-01-25 20:25:05Z tv $
    035     */
    036    public class TurbineServices
    037            extends BaseServiceBroker
    038            implements ServiceManager
    039    {
    040        /** The single instance of this class. */
    041        private static ServiceManager instance = new TurbineServices();
    042
    043        /**
    044         * This constructor is protected to force clients to use
    045         * getInstance() to access this class.
    046         */
    047        protected TurbineServices()
    048        {
    049            super();
    050        }
    051
    052        /**
    053         * The method through which this class is accessed as a broker.
    054         *
    055         * @return The single instance of this class.
    056         */
    057        public static ServiceManager getInstance()
    058        {
    059            return instance;
    060        }
    061
    062        /**
    063         * The method through which to change the default manager.
    064         * Note that services of the previous manager will be shutdown.
    065         * @param manager a new service manager.
    066         */
    067        public static synchronized void setManager(ServiceManager manager)
    068        {
    069            ServiceManager previous = instance;
    070            instance = manager;
    071            if (previous != null)
    072            {
    073                previous.shutdownServices();
    074            }
    075        }
    076    }