NBloodServerSupervisor/Supervisor/Program.cs

using System;
using System.Linq;
using System.Threading;
using Model;

namespace Supervisor
{
    class Program
    {
        public static readonly State State = new State();

        public static void Main()
        {
            NBloodServerListener.StartListening();
            WebApiListener.StartListening();
            PublicServerManager.Start();
            PrivateServerManager.Start();
            StatisticsManager.Start();

            while (true)
            {
                RemoveCrashedServers();
                Thread.Sleep(TimeSpan.FromSeconds(3));
            }
        }

        private static void RemoveCrashedServers()
        {
            try
            {
                var crashedServers = State.Servers.Values
                    .Where(s => s.IsStarted && DateTime.UtcNow - s.LastHeartBeatUtc < TimeSpan.FromMinutes(15))
                    .Select(s => s.Port);

                foreach (var port in crashedServers)
                {
                    State.Servers.TryRemove(port, out _);
                }
            }
            catch
            {
                // Log...
            }
        }
    }
}