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Java > Open Source Codes > org > apache > fulcrum > TurbineServices


1 package org.apache.fulcrum;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2001 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation" and
29  * "Apache Turbine" must not be used to endorse or promote products
30  * derived from this software without prior written permission. For
31  * written permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache",
34  * "Apache Turbine", nor may "Apache" appear in their name, without
35  * prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  */
56
57 /**
58  * This is a singleton utility class that acts as a Services broker.
59  *
60  * @author <a HREF="mailto:greg@shwoop.com">Greg Ritter</a>
61  * @author <a HREF="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
62  * @author <a HREF="mailto:burton@apache.org">Kevin Burton</a>
63  * @author <a HREF="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
64  * @author <a HREF="mailto:jon@latchkey.com">Jon S. Stevens</a>
65  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
66  * @version $Id: TurbineServices.java,v 1.1 2004/11/12 10:25:48 epugh Exp $
67  */
68 public class TurbineServices
69     extends BaseServiceBroker
70     implements ServiceManager
71 {
72     /** The single instance of this class. */
73     private static ServiceManager instance = new TurbineServices();
74
75     /**
76      * This constructor is protected to force clients to use
77      * getInstance() to access this class.
78      */
79     protected TurbineServices()
80     {
81         super();
82     }
83
84     /**
85      * The method through which this class is accessed as a broker.
86      *
87      * @return The single instance of this class.
88      */
89     public static ServiceManager getInstance()
90     {
91         return instance;
92     }
93
94     /**
95      * The method through which to change the default manager.
96      * Note that services of the previous manager will be shutdown.
97      * @param manager a new service manager.
98      */
99     public static synchronized void setManager(ServiceManager manager)
100     {
101         ServiceManager previous = instance;
102         instance = manager;
103         if (previous != null)
104         {
105             previous.shutdownServices();
106         }
107     }
108 }
109
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