Ein leicht verständliches Code-Beispiel zum Einsatz von Java Management Extensions (JMX) mit Standard MBeans.
ButtonStatsMBean
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| package de.bennyn.jmx.instrument;
public interface ButtonStatsMBean
{
// Accessible through JConsole
public void changeClicks(int timesClicked); // Operation
public int getTimesClicked(); // Attribute
} |
package de.bennyn.jmx.instrument;
public interface ButtonStatsMBean
{
// Accessible through JConsole
public void changeClicks(int timesClicked); // Operation
public int getTimesClicked(); // Attribute
}
ButtonStats
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| package de.bennyn.jmx.instrument;
public class ButtonStats implements ButtonStatsMBean
{
private int timesClicked;
public ButtonStats()
{
}
public void init()
{
this.timesClicked = 0;
}
public void addClick()
{
this.timesClicked++;
}
// Accessible through JConsole
@Override
/*
* Don't name this method setTimesClicked(),
* because then it will not appear as an operation in JConsole.
*/
public void changeClicks(int timesClicked)
{
this.timesClicked = timesClicked;
}
@Override
public int getTimesClicked()
{
return timesClicked;
}
} |
package de.bennyn.jmx.instrument;
public class ButtonStats implements ButtonStatsMBean
{
private int timesClicked;
public ButtonStats()
{
}
public void init()
{
this.timesClicked = 0;
}
public void addClick()
{
this.timesClicked++;
}
// Accessible through JConsole
@Override
/*
* Don't name this method setTimesClicked(),
* because then it will not appear as an operation in JConsole.
*/
public void changeClicks(int timesClicked)
{
this.timesClicked = timesClicked;
}
@Override
public int getTimesClicked()
{
return timesClicked;
}
}
Main
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| package de.bennyn.jmx.view;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import java.lang.management.ManagementFactory;
import javax.management.ObjectName;
import javax.management.JMException;
import de.bennyn.jmx.instrument.ButtonStats;
public class Main
{
// MBean
private static ButtonStats manageableBean;
public static void main(String[] args)
{
// Management (JMX)
initManagement();
// View (GUI)
JFrame frame = new JFrame("Title");
frame.setBounds(0, 0, 400, 400);
frame.setVisible(true);
JButton button = new JButton("Push me");
button.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent ae)
{
System.out.println("Button pressed!");
manageableBean.addClick();
}
});
button.setSize(100, 100);
frame.add(button);
}
private static void initManagement()
{
// Register MBean in Platform MBeanServer
try
{
Main.manageableBean = new ButtonStats();
ManagementFactory.getPlatformMBeanServer().
registerMBean(Main.manageableBean,
new ObjectName("de.bennyn.jmx.instrument:type=ButtonStats"));
}
catch (JMException ex)
{
System.out.println(ex.getLocalizedMessage());
}
// Initialize MBean
manageableBean.init();
}
} |
package de.bennyn.jmx.view;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import java.lang.management.ManagementFactory;
import javax.management.ObjectName;
import javax.management.JMException;
import de.bennyn.jmx.instrument.ButtonStats;
public class Main
{
// MBean
private static ButtonStats manageableBean;
public static void main(String[] args)
{
// Management (JMX)
initManagement();
// View (GUI)
JFrame frame = new JFrame("Title");
frame.setBounds(0, 0, 400, 400);
frame.setVisible(true);
JButton button = new JButton("Push me");
button.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent ae)
{
System.out.println("Button pressed!");
manageableBean.addClick();
}
});
button.setSize(100, 100);
frame.add(button);
}
private static void initManagement()
{
// Register MBean in Platform MBeanServer
try
{
Main.manageableBean = new ButtonStats();
ManagementFactory.getPlatformMBeanServer().
registerMBean(Main.manageableBean,
new ObjectName("de.bennyn.jmx.instrument:type=ButtonStats"));
}
catch (JMException ex)
{
System.out.println(ex.getLocalizedMessage());
}
// Initialize MBean
manageableBean.init();
}
}