/**
* This is a sample implementation of a Role Change Listener which is an actor, which registers itself to the ClusterRoleChangeNotifier
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* The Role Change listener receives a SetNotifiers message with the notifiers to register itself with.
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+ * <p>
* It kicks of a scheduler which sents registration messages to the notifiers, till it gets a RegisterRoleChangeListenerReply
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* If all the notifiers have been regsitered with, then it cancels the scheduler.
* It starts the scheduler again when it receives a new registration
*