/*

 * Copyright 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:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions 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 nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 *

 * 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());

            }

        }

    }

}