public void Receive(Shutdown message)
        {
            Console.WriteLine("Shutdown requested...");

            try
            {
                _engine.Dispose();

                Console.WriteLine("Shut down gracefully.");
            }
            catch (Exception e)
            {
                ConsoleWriter.Write(ConsoleColor.Red, e.ToString());
                throw;
            }
            finally
            {
                _completion.Set();
            }
        }
 public void Dispose()
 {
     _agent?.Dispose();
 }