1 package org.apache.turbine.services;
2
3
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
20 * under the License.
21 */
22
23
24 /**
25 * This is a singleton utility class that acts as a Services broker.
26 *
27 * @author <a href="mailto:greg@shwoop.com">Greg Ritter</a>
28 * @author <a href="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
29 * @author <a href="mailto:burton@apache.org">Kevin Burton</a>
30 * @author <a href="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
31 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
32 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
33 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
34 * @version $Id$
35 */
36 public class TurbineServices
37 extends BaseServiceBroker
38 implements ServiceManager
39 {
40 /** The single instance of this class. */
41 private static ServiceManager instance = new TurbineServices();
42
43 /**
44 * This constructor is protected to force clients to use
45 * getInstance() to access this class.
46 */
47 protected TurbineServices()
48 {
49 super();
50 }
51
52 /**
53 * The method through which this class is accessed as a broker.
54 *
55 * @return The single instance of this class.
56 */
57 public static ServiceManager getInstance()
58 {
59 return instance;
60 }
61
62 /**
63 * The method through which to change the default manager.
64 * Note that services of the previous manager will be shutdown.
65 * @param manager a new service manager.
66 */
67 public static synchronized void setManager(ServiceManager manager)
68 {
69 ServiceManager previous = instance;
70 instance = manager;
71 if (previous != null)
72 {
73 previous.shutdownServices();
74 }
75 }
76 }