/* * @(#)JTopPlugin.java	1.2  06/05/08 * * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this *  list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, *  this list of conditions and the following disclaimer in the documentation *  and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. *//* * @(#)JTopPlugin.java	1.2 06/05/08 * * Example of a JConsole Plugin.  This loads JTop as a JConsole tab. * * @author Mandy Chung */import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.util.LinkedHashMap;import java.util.Map;import javax.management.MBeanServerConnection;import javax.swing.JPanel;import javax.swing.SwingWorker;import com.sun.tools.jconsole.JConsolePlugin;import com.sun.tools.jconsole.JConsoleContext;import com.sun.tools.jconsole.JConsoleContext.ConnectionState;/** * JTopPlugin is a subclass to com.sun.tools.jconsole.JConsolePlugin * * JTopPlugin is loaded and instantiated by JConsole.  One instance * is created for each window that JConsole creates. It listens to * the connected property change so that it will update JTop with * the valid MBeanServerConnection object.  JTop is a JPanel object * displaying the thread and its CPU usage information. */public class JTopPlugin extends JConsolePlugin implements PropertyChangeListener{    private JTop jtop = null;    private Map<String, JPanel> tabs = null;    public JTopPlugin() {        // register itself as a listener        addContextPropertyChangeListener(this);    }    /*     * Returns a JTop tab to be added in JConsole.     */    public synchronized Map<String, JPanel> getTabs() {        if (tabs == null) {            jtop = new JTop();            jtop.setMBeanServerConnection(                getContext().getMBeanServerConnection());            // use LinkedHashMap if you want a predictable order            // of the tabs to be added in JConsole            tabs = new LinkedHashMap<String, JPanel>();            tabs.put("JTop", jtop);        }        return tabs;    }    /*     * Returns a SwingWorker which is responsible for updating the JTop tab.     */    public SwingWorker<?,?> newSwingWorker() {        return jtop.newSwingWorker();        }    // You can implement the dispose() method if you need to release     // any resource when the plugin instance is disposed when the JConsole    // window is closed.    //    // public void dispose() {    // }                                                                        /*     * Property listener to reset the MBeanServerConnection     * at reconnection time.     */    public void propertyChange(PropertyChangeEvent ev) {        String prop = ev.getPropertyName();        if (prop == JConsoleContext.CONNECTION_STATE_PROPERTY) {            ConnectionState oldState = (ConnectionState)ev.getOldValue();            ConnectionState newState = (ConnectionState)ev.getNewValue();            // JConsole supports disconnection and reconnection            // The MBeanServerConnection will become invalid when            // disconnected. Need to use the new MBeanServerConnection object            // created at reconnection time.            if (newState == ConnectionState.CONNECTED && jtop != null) {                jtop.setMBeanServerConnection(                    getContext().getMBeanServerConnection());             }        }    }}