A higher level of JMX Notification
Hi everybody.
While JMX has a great way of communication towards the MBeans through the use of high level interfaces, the notification mechanism is only available through a pre-determined interface (the NotificatioListener) that support only the passage of some pre-determined information such as a timestamp, a counter, a string message and an object.
I've developed an idea of mine that enables the use of high level interfaces also to obtain notifications from the MBeans. For example:
publicinterface CountNotifier{
void countChanged(int newValue);
}
will be an interface used both on the MBean and the client sides. On the MBean side the programmer will simply call
countNotifier.countChanged(count);
in order to notify registered listeners instead of creating a javax.management.Notification object and send it.
On the client side, the programmer will register an implemention of CountNotifier, for example:
new CountNotifier(){
@Override
publicvoid countChanged(int newValue){
System.out.println("Notification of new value: " + newValue);
}
}
I've realized a little demonstrative draft implementation of an extension to the JMX API. You can find it in the lib package (there's actualy one helper class with 2 static methods, one for the client and one for the server and an annotation, this should be used to annotate the MBean with the interfaces of notifier that it supports).
In the example package there are some classes that show how the programmers on MBean side and on the Client side can write the code to use this new higher level notification feature.
https://devel.savona.cnit.it/~perr/jmx-notification.zip
please, accept the certificate ;-)
I look forward to hearing your opinions.
Marco P.
