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Java > Open Source Codes > org > netbeans > modules > javacore > RequestPoster


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.javacore;
20
21 import java.lang.ref.WeakReference JavaDoc;
22 import org.openide.util.RequestProcessor;
23 import org.openide.util.Task;
24 import org.openide.util.TaskListener;
25
26 /**
27  *
28  * @author Martin Matula
29  */
30 public class RequestPoster {
31
32     private RequestProcessor rp;
33     private WeakReference JavaDoc/*<RequestProcessor.Task>*/ queuedTask;
34
35     public RequestPoster() {
36     }
37
38     /** Creates a new instance of RequestPoster
39      * @param rp RequestProcessor used for posting requests.
40      */
41     public RequestPoster(RequestProcessor rp) {
42         this.rp = rp;
43     }
44     
45     public synchronized void post(Runnable JavaDoc runnable) {
46         RequestProcessor.Task task = queuedTask == null ? null : (RequestProcessor.Task) queuedTask.get();
47         if (task != null) {
48             task.cancel();
49         }
50         if (rp == null) rp = new RequestProcessor("Implicit RequestPoster's RP-" + hashCode()); // NOI18N
51 queuedTask = new WeakReference JavaDoc(rp.post(runnable));
52     }
53 }
54
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