hi all,
one thing I like about JMX is the built-in Notification System.
for instance, I, like as component to do the following:
ObjectName timer = new ObjectName( "service:name=timer" );
MBeanServer mbeanServer = /* get it from somewhere */
/* this is the price of the micro kernel :-( */
/* register an special notification, that is scheduled ... */
Integer notId = (Integer )server.invoke( timer, "addNotification",
new Object[] {
"timer.notification",
"bla bla", null,
new Date( System.currentTimeMillis( ) ),
new Long( Timer.ONE_HOUR )
},
new String[ ] {
String.class.getName( ),
String.class.getName( ),
Object.class.getName( ),
Date.class.getName( ),
Long.TYPE
}
);
the only question that comes to my mind here is how to check which
Notifications already exists (perhaps that's a lack of my understanding)
- it would be handy to define a notification only once.....
mbeanServer.addNotificationListener(
timer, receiver, new TimerFilter( notId ), null
);
* what do you think about such a notification system?
surely one could easily write a Service or Component that implements the
same thing, but I think the value of having something like that
implemented in the core, (notifications are a primitve type in the JMX
Architecture (like Operations ) ), is you can use a standardized way to
get certain notifications (in this case timing calls).
although the thing is quite verbose (because of the "micro kernel"
design pattern), it is quite handy I think.
perhaps I am missing something completly.
btw:
is there some excalibur/merlin component that implements a kind of
scheduling/timing component, as I would need one, and I don't want to
implement something that is already there and implemented by guru's like
you ;-).
thanks
-- Jakob
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