Akka.Event.EventStream.RegisterWithUnsubscriber C# (CSharp) Метод

        private void RegisterWithUnsubscriber(IActorRef subscriber)
        {
            _initiallySubscribedOrUnsubscriber.Match().With<Left<IImmutableSet<IActorRef>>>(v =>
            {
                if (_initiallySubscribedOrUnsubscriber.CompareAndSet(v,
                    Either.Left<IImmutableSet<IActorRef>>(v.Value.Add(subscriber))))
                {
                    RegisterWithUnsubscriber(subscriber);
                }

            }).With<Right<IActorRef>>(unsubscriber =>
            {
                unsubscriber.Value.Tell( new EventStreamUnsubscriber.Register(subscriber));
            });
        }