public Watcher(Address a, IActorRef replyTo)
{
_a = a;
_replyTo = replyTo;
Context.ActorSelection(new RootActorPath(a) / "user" / "address-receiver").Tell(new Identify(null));
Receive<ActorIdentity>(identity =>
{
Context.Watch(identity.Subject);
_replyTo.Tell(Done.Instance);
});
Receive<Terminated>(t => { });
}
}