Invoked when a JMX notification occurs.

  Invoked when a JMX notification occurs.
The implementation of this method should return as soon as possible, to avoid
blocking its notification broadcaster.
Parameters:
- notification - The notification.
- handback - An opaque object which helps the listener to associate information regarding the MBean emitter. This object is passed to the MBean during the addListener call and resent, without modification, to the listener. The MBean object should not use or modify the object.