An optional interface that may be provided by service provider
objects that will be registered with a
ServiceRegistry. If this interface is present,
notification of registration and deregistration will be performed.
Called when an object implementing this interface is added to
the given category of the given
registry. The object may already be registered
under another category or categories.
Parameters:
registry - a ServiceRegistry where this
object has been registered.
category - a Class object indicating the
registry category under which this object has been registered.
Called when an object implementing this interface is removed
from the given category of the given
registry. The object may still be registered
under another category or categories.
Parameters:
registry - a ServiceRegistry from which this
object is being (wholly or partially) deregistered.
category - a Class object indicating the
registry category from which this object is being deregistered.