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Java > Open Source Codes > org > exolab > jms > service > ServiceManager


1 /**
2  * Redistribution and use of this software and associated documentation
3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
6  * 1. Redistributions of source code must retain copyright
7  * statements and notices. Redistributions must also contain a
8  * copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
13  * materials provided with the distribution.
14  *
15  * 3. The name "Exolab" must not be used to endorse or promote
16  * products derived from this Software without prior written
17  * permission of Exoffice Technologies. For written permission,
18  * please contact info@exolab.org.
19  *
20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32  * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39  * OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Copyright 1999-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42  */
43
44 package org.exolab.jms.service;
45
46 import java.util.ArrayList JavaDoc;
47 import java.util.HashMap JavaDoc;
48 import java.util.Iterator JavaDoc;
49
50
51 /**
52  * The ServiceManager is based on the singleton design pattern and is
53  * responsible for managing a collection of {@link Serviceable} objects.
54  * <br>
55  * All serviceable objects are named and no two sevices can have the same
56  * name.
57  * <p>
58  * The ServiceManager singleton allows the client to manage a group of
59  * Serviceable entities.
60  *
61  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:51:01 $
62  * @author <a HREF="mailto:jima@comware.com.au">Jim Alateras</a>
63  * @see BasicService
64  * @see Service
65  * @see ServiceGroup
66  * @see Serviceable
67  */
68 public class ServiceManager extends ServiceGroup {
69
70     /**
71      * The singleton instance of the ServiceManager
72      */
73     private static ServiceManager _instance = null;
74
75     /**
76      * Construct a new service manager
77      */
78     private ServiceManager() {
79     }
80
81     /**
82      * Return the single instance of this class. If need be, create it before
83      * returning it.
84      *
85      * @return the ServiceManager singleton
86      */
87     public static synchronized ServiceManager instance() {
88         if (_instance == null) {
89             _instance = new ServiceManager();
90         }
91         return _instance;
92     }
93
94 }
95
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