Lifecycle interface that may be implemented by objects that need to know when the {@link org.apache.hivemind.Registry}has shutdown. Typically, this is implemented by core service implementations (as well as many proxies created by HiveMind).
A core service implementation that implements this interface will automatically be registered for notifications (exception: not if the service uses the threaded service model).
Using this notification is preferrable to implementing a finalize()
since it will be invoked at a known time.
The order in which listeners will be invoked is not well known. In the future, some form of dependency system may be instituted.
@author Howard Lewis Ship