public interface RegistrationListener
void notify(java.lang.String layer, java.lang.String appContext)
RegistrationListener is associated with a provider registration within the factory, the factory
must call its
notify method when the corresponding registration is unregistered or replaced.
The factory detaches the listener from the corresponding registration once the listener has been notified for the
detachListerner method must be called to detach listeners that are no longer in use.
layer- A String identifying the one or more message layers corresponding to the registration for which the listener is being notified.
appContext- A String value identifying the application contexts corresponding to the registration for which the listener is being notified.