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 tma@netspace.net.au.
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 2003-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: ThreadedActions.java,v 1.3 2004/01/31 13:44:24 tanderson Exp $
44 */
45 package org.exolab.jmscts.core;
46
47 import java.util.ArrayList;
48 import java.util.Iterator;
49 import java.util.List;
50
51
52 /***
53 * Helper class to run and wait for completion of a set of
54 * {@link ThreadedAction} instances.
55 *
56 * @version $Revision: 1.3 $ $Date: 2004/01/31 13:44:24 $
57 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
58 */
59 public class ThreadedActions extends ThreadedAction {
60
61 /***
62 * A list of <code>ThreadedAction</code> instances
63 */
64 private List _actions = new ArrayList();
65
66 /***
67 * Construct a new <code>ThreadedActions</code>
68 */
69 public ThreadedActions() {
70 }
71
72 /***
73 * Add an action to be started and monitored by this
74 *
75 * @param action the action to add
76 */
77 public void addAction(ThreadedAction action) {
78 _actions.add(action);
79 }
80
81 /***
82 * Run the actions in separate threads
83 *
84 * @throws Exception for any error
85 */
86 public void runProtected() throws Exception {
87 Iterator iterator = _actions.iterator();
88 while (iterator.hasNext()) {
89 ThreadedAction action = (ThreadedAction) iterator.next();
90 action.start();
91 }
92 iterator = _actions.iterator();
93 while (iterator.hasNext()) {
94 ThreadedAction action = (ThreadedAction) iterator.next();
95 action.waitForCompletion();
96 }
97 }
98
99 /***
100 * Returns any exception thrown by {@link #runProtected}. If
101 * <code>null</code> returns any exception thrown by a child action,
102 * otherwise <code>null</code>, if no exception was thrown
103 *
104 * @return any exception thrown, or <code>null</code>, if none was
105 * thrown
106 */
107 public Exception getException() {
108 Exception result = super.getException();
109 if (result == null) {
110 Iterator iterator = _actions.iterator();
111 while (iterator.hasNext()) {
112 ThreadedAction action = (ThreadedAction) iterator.next();
113 result = action.getException();
114 if (result != null) {
115 break;
116 }
117 }
118 }
119 return result;
120 }
121
122 }
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