Akka.Actor.ActorCell.UnwatchWatchedActors C# (CSharp) Метод

        protected void UnwatchWatchedActors(ActorBase actor)
        {
            var watching = _state
                .GetWatching()
                .ToList();

            if (!watching.Any()) return;

            MaintainAddressTerminatedSubscription(() =>
            {
                try
                {
                    // ➡➡➡ NEVER SEND THE SAME SYSTEM MESSAGE OBJECT TO TWO ACTORS
                    foreach (var watchee in watching.OfType<IInternalActorRef>())
                        watchee.SendSystemMessage(new Unwatch(watchee, _self));
                }
                finally
                {
                    _state = _state.ClearWatching();
                    _state = _state.ClearTerminated();
                }
            });
        }