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 }