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 @SuppressWarnings("serial")
  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 
  40     public Tab(VMPanel vmPanel, String name) {
  41         this.vmPanel = vmPanel;
  42         this.name = name;
  43     }
  44 
  45     public SwingWorker<?, ?> newSwingWorker() {
  46         return null;
  47     }
  48 
  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 
  69     public synchronized void dispose() {
  70         if(worker != null)
  71             worker.stopWorker();
  72 
  73         // Subclasses will override to clean up
  74     }
  75 
  76     protected VMPanel getVMPanel() {
  77         return vmPanel;
  78     }
  79 
  80     OverviewPanel[] getOverviewPanels() {
  81         return null;
  82     }
  83 
  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 
  92     public Dimension getPreferredSize() {
  93         return new Dimension(700, 500);
  94     }
  95 }