1 /*
   2  * Copyright (c) 2004, 2006, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  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).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.tools.jconsole;
  27 
  28 import java.awt.*;
  29 import javax.swing.*;
  30 
  31 public abstract class Tab extends JPanel {
  32     private String name;
  33     private Worker worker;
  34 
  35     protected VMPanel vmPanel;
  36 
  37     private SwingWorker<?, ?> prevSW;
  38 
  39     public Tab(VMPanel vmPanel, String name) {
  40         this.vmPanel = vmPanel;
  41         this.name = name;
  42     }
  43 
  44     public SwingWorker<?, ?> newSwingWorker() {
  45         return null;
  46     }
  47 
  48     public void update() {
  49         final ProxyClient proxyClient = vmPanel.getProxyClient();
  50         if (!proxyClient.hasPlatformMXBeans()) {
  51             throw new UnsupportedOperationException(
  52                 "Platform MXBeans not registered in MBeanServer");
  53         }
  54 
  55         SwingWorker<?,?> sw = newSwingWorker();
  56         // schedule SwingWorker to run only if the previous
  57         // SwingWorker has finished its task and it hasn't started.
  58         if (prevSW == null || prevSW.isDone()) {
  59             if (sw == null || sw.getState() == SwingWorker.StateValue.PENDING) {
  60                 prevSW = sw;
  61                 if (sw != null) {
  62                     sw.execute();
  63                 }
  64             }
  65         }
  66     }
  67 
  68     public synchronized void dispose() {
  69         if(worker != null)
  70             worker.stopWorker();
  71 
  72         // Subclasses will override to clean up
  73     }
  74 
  75     protected VMPanel getVMPanel() {
  76         return vmPanel;
  77     }
  78 
  79     OverviewPanel[] getOverviewPanels() {
  80         return null;
  81     }
  82 
  83     public synchronized void workerAdd(Runnable job) {
  84         if (worker == null) {
  85             worker = new Worker(name+"-"+vmPanel.getConnectionName());
  86             worker.start();
  87         }
  88         worker.add(job);
  89     }
  90 
  91     public Dimension getPreferredSize() {
  92         return new Dimension(700, 500);
  93     }
  94 }