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 java.awt.event.*;
  30 import java.beans.*;
  31 
  32 import javax.swing.*;
  33 
  34 public abstract class Tab extends JPanel {
  35     private String name;
  36     private Worker worker;
  37 
  38     protected VMPanel vmPanel;
  39 
  40     private SwingWorker<?, ?> prevSW;
  41 
  42     public Tab(VMPanel vmPanel, String name) {
  43         this.vmPanel = vmPanel;
  44         this.name = name;
  45     }
  46 
  47     public SwingWorker<?, ?> newSwingWorker() {
  48         return null;
  49     }
  50 
  51     public void update() {
  52         final ProxyClient proxyClient = vmPanel.getProxyClient();
  53         if (!proxyClient.hasPlatformMXBeans()) {
  54             throw new UnsupportedOperationException(
  55                 "Platform MXBeans not registered in MBeanServer");
  56         }
  57 
  58         SwingWorker<?,?> sw = newSwingWorker();
  59         // schedule SwingWorker to run only if the previous
  60         // SwingWorker has finished its task and it hasn't started.
  61         if (prevSW == null || prevSW.isDone()) {
  62             if (sw == null || sw.getState() == SwingWorker.StateValue.PENDING) {
  63                 prevSW = sw;
  64                 if (sw != null) {
  65                     sw.execute();
  66                 }
  67             }
  68         }
  69     }
  70 
  71     public synchronized void dispose() {
  72         if(worker != null)
  73             worker.stopWorker();
  74 
  75         // Subclasses will override to clean up
  76     }
  77 
  78     protected VMPanel getVMPanel() {
  79         return vmPanel;
  80     }
  81 
  82     OverviewPanel[] getOverviewPanels() {
  83         return null;
  84     }
  85 
  86     public synchronized void workerAdd(Runnable job) {
  87         if (worker == null) {
  88             worker = new Worker(name+"-"+vmPanel.getConnectionName());
  89             worker.start();
  90         }
  91         worker.add(job);
  92     }
  93 
  94     public Dimension getPreferredSize() {
  95         return new Dimension(700, 500);
  96     }
  97 }