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 2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42   *
43   * $Id: CallbackServiceImpl.java,v 1.1 2004/11/26 01:51:07 tanderson Exp $
44   */
45  package org.exolab.jms.net;
46  
47  import java.util.ArrayList;
48  import java.util.Iterator;
49  import java.util.List;
50  
51  
52  /***
53   * Service which allows clients to register a callback
54   *
55   * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:51:07 $
56   * @author      <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
57   */
58  public class CallbackServiceImpl implements CallbackService {
59  
60      /***
61       * The set of callbacks
62       */
63      private List _callbacks = new ArrayList();
64  
65      /***
66       * Register a callback
67       *
68       * @param callback the callback to register
69       */
70      public synchronized void addCallback(Callback callback) {
71          _callbacks.add(callback);
72      }
73  
74      /***
75       * De-register a callback
76       *
77       * @param callback the callback to remove
78       */
79      public synchronized void removeCallback(Callback callback) {
80          _callbacks.remove(callback);
81      }
82  
83      /***
84       * Returns a list of the registered callbacks
85       *
86       * @return a list of the registered callbacks
87       */
88      public synchronized List getCallbacks() {
89          return _callbacks;
90      }
91  
92      /***
93       * Invokes each callback
94       *
95       * @param object the object to pass to the callback
96       */
97      public void invoke(Object object) {
98          Iterator iterator = _callbacks.iterator();
99          while (iterator.hasNext()) {
100             Callback callback = (Callback) iterator.next();
101             callback.invoke(object);
102         }
103     }
104 
105 }