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Java > Open Source Codes > org > apache > turbine > services > TurbineServices


1 package org.apache.turbine.services;
2
3 /*
4  * Copyright 2001-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License")
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 /**
20  * This is a singleton utility class that acts as a Services broker.
21  *
22  * @author <a HREF="mailto:greg@shwoop.com">Greg Ritter</a>
23  * @author <a HREF="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
24  * @author <a HREF="mailto:burton@apache.org">Kevin Burton</a>
25  * @author <a HREF="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
26  * @author <a HREF="mailto:jon@latchkey.com">Jon S. Stevens</a>
27  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
28  * @author <a HREF="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
29  * @version $Id: TurbineServices.java,v 1.12.2.2 2004/05/20 03:05:18 seade Exp $
30  */
31 public class TurbineServices
32         extends BaseServiceBroker
33         implements ServiceManager
34 {
35     /** The single instance of this class. */
36     private static ServiceManager instance = new TurbineServices();
37
38     /**
39      * This constructor is protected to force clients to use
40      * getInstance() to access this class.
41      */
42     protected TurbineServices()
43     {
44         super();
45     }
46
47     /**
48      * The method through which this class is accessed as a broker.
49      *
50      * @return The single instance of this class.
51      */
52     public static ServiceManager getInstance()
53     {
54         return instance;
55     }
56
57     /**
58      * The method through which to change the default manager.
59      * Note that services of the previous manager will be shutdown.
60      * @param manager a new service manager.
61      */
62     public static synchronized void setManager(ServiceManager manager)
63     {
64         ServiceManager previous = instance;
65         instance = manager;
66         if (previous != null)
67         {
68             previous.shutdownServices();
69         }
70     }
71 }
72
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