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/*
* Copyright (c) 2006, Oracle and/or its affiliates. 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 Oracle 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.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
/*
*
* 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.swing.JPanel;
import javax.swing.SwingWorker;
import com.sun.tools.jconsole.JConsoleContext;
import com.sun.tools.jconsole.JConsoleContext.ConnectionState;
import com.sun.tools.jconsole.JConsolePlugin;
/**
* 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.
*/
@Override
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.
*/
@Override
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.
*/
@Override
public void propertyChange(PropertyChangeEvent ev) {
String prop = ev.getPropertyName();
if (prop == JConsoleContext.CONNECTION_STATE_PROPERTY) {
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());
}
}
}
}
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