akkadotnet/akka.net

public class JobExecutor : ReceiveActor
    {
        private readonly Application _application;
        private bool _working = false;

        public JobExecutor(Application application)
        {
            _application = application;

            Receive<BeginWork>(AsyncBehavior.Reentrant, _ => _application.ExecuteInScope(() => OnBeginWork()));
        }

        private async Task OnBeginWork()
        {
            if (_working)
            {
                Console.WriteLine("Executando trabalho ainda {0}", Thread.CurrentThread.ManagedThreadId);
                return;
            }

            _working = true;

            Console.WriteLine("Iniciando trabalho {0}", Thread.CurrentThread.ManagedThreadId);
            //Thread.Sleep(8000);
            await Task.Delay(10000);
            Console.WriteLine("Finalizando trabalho {0}", Thread.CurrentThread.ManagedThreadId);

            _working = false;
        }
    }