“Hello World,” the JMX way - JMX in Action - page 44

support class is that you do not have to write code for the broadcaster interface.
If your MBean does not need to extend a class, then have it extend the Notifica-
tionBroadcasterSupport class and reuse that implementation. The HelloWorld
class does not need any special super class, so you are free to extend the broad-
caster support class, NotificationBroadcasterSupport , as shown in listing 2.3.

Listing 2.3 HelloWorld.java

package jmxbook.ch2;

import javax.management.*;

public class HelloWorld extends NotificationBroadcasterSupport
implements HelloWorldMBean
{

B

Extend NotificationBroadcasterSupport class

C

Define two public
constructors

public HelloWorld()
{
this.greeting = "Hello World! I am a Standard MBean";
}

C

Define two public
constructors

public HelloWorld( String greeting )
{
this.greeting = greeting;
}

public void setGreeting( String greeting )
{
this.greeting = greeting;

Notification notification = new Notification(
"jmxbook.ch2.helloWorld.test", this, -1,
System.currentTimeMillis(), greeting );

D

Create
javax.management.Notification
object

sendNotification( notification );
}

Send notification

public String getGreeting()
{
return greeting;
}

public void printGreeting()
{
System.out.println( greeting );
}

private String greeting;

}//class