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Java > Open Source Codes > org > netbeans > modules > timers > InstanceWatcherTest


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.modules.timers;
20
21 import java.lang.ref.WeakReference JavaDoc;
22 import javax.swing.event.ChangeEvent JavaDoc;
23 import javax.swing.event.ChangeListener JavaDoc;
24 import org.netbeans.junit.NbTestCase;
25
26 /**
27  *
28  * @author Petr Hrebejk
29  */
30 public class InstanceWatcherTest extends NbTestCase {
31
32     public InstanceWatcherTest(String JavaDoc testName) {
33         super(testName);
34     }
35
36     public void testFiring() throws Exception JavaDoc {
37         System.out.println("addChangeListener");
38
39         QueueListener listener = new QueueListener();
40         InstanceWatcher iw = new InstanceWatcher();
41         
42         iw.addChangeListener(listener);
43         
44         Integer JavaDoc ts1 = new Integer JavaDoc( 20 );
45         iw.add( ts1 );
46                
47         WeakReference JavaDoc tmp; // For forcing GC
48
49         tmp = new WeakReference JavaDoc( new Object JavaDoc() );
50         assertGC( "", tmp );
51         
52         assertEquals( "There should be no change in the queue", 0, listener.changeCount );
53         
54         ts1 = null; // Remove hard reference
55
56         tmp = new WeakReference JavaDoc( new Object JavaDoc() );
57         assertGC( "", tmp ); // Do garbage collect
58
59         assertEquals( "There should be one change in the queue", 1, listener.changeCount );
60                 
61     }
62
63     
64     private static class QueueListener implements ChangeListener JavaDoc {
65         
66         int changeCount;
67         
68         public void stateChanged( ChangeEvent JavaDoc e ) {
69             changeCount ++;
70         }
71         
72     }
73     
74 }
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