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11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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25 
26 package sun.tools.jconsole;
27 
28 import java.awt.*;
29 import javax.swing.*;
30 
31 @SuppressWarnings("serial") // JDK implementation class
32 public abstract class Tab extends JPanel {
33     private String name;
34     private Worker worker;
35 
36     protected VMPanel vmPanel;
37 
38     private SwingWorker<?, ?> prevSW;
39 
Tab(VMPanel vmPanel, String name)40     public Tab(VMPanel vmPanel, String name) {
41         this.vmPanel = vmPanel;
42         this.name = name;
43     }
44 
newSwingWorker()45     public SwingWorker<?, ?> newSwingWorker() {
46         return null;
47     }
48 
update()49     public void update() {
50         final ProxyClient proxyClient = vmPanel.getProxyClient();
51         if (!proxyClient.hasPlatformMXBeans()) {
52             throw new UnsupportedOperationException(
53                 "Platform MXBeans not registered in MBeanServer");
54         }
55 
56         SwingWorker<?,?> sw = newSwingWorker();
57         // schedule SwingWorker to run only if the previous
58         // SwingWorker has finished its task and it hasn't started.
59         if (prevSW == null || prevSW.isDone()) {
60             if (sw == null || sw.getState() == SwingWorker.StateValue.PENDING) {
61                 prevSW = sw;
62                 if (sw != null) {
63                     sw.execute();
64                 }
65             }
66         }
67     }
68 
dispose()69     public synchronized void dispose() {
70         if(worker != null)
71             worker.stopWorker();
72 
73         // Subclasses will override to clean up
74     }
75 
getVMPanel()76     protected VMPanel getVMPanel() {
77         return vmPanel;
78     }
79 
getOverviewPanels()80     OverviewPanel[] getOverviewPanels() {
81         return null;
82     }
83 
workerAdd(Runnable job)84     public synchronized void workerAdd(Runnable job) {
85         if (worker == null) {
86             worker = new Worker(name+"-"+vmPanel.getConnectionName());
87             worker.start();
88         }
89         worker.add(job);
90     }
91 
getPreferredSize()92     public Dimension getPreferredSize() {
93         return new Dimension(700, 500);
94     }
95 }
96