public interface RegistrationListener
When a 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.
layer- A String identifying the one or more message layers corresponding to the registration for which the listerner is being notified.
appContext- A String value identifying the application contexts corresponding to the registration for which the listener is being notified. The factory detaches the listener from the corresponding registration once the listener has been notified for the registration. The
detachListernermethod must be called to detach listeners that are no longer in use.
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