public HeartbeatManager(HorseServer server, TimeSpan interval)
 {
     _server   = server;
     _interval = interval;
 }
 /// <summary>
 /// Creates new connection handler for listening specified port
 /// </summary>
 public ConnectionHandler(HorseServer server, HostListener listener)
 {
     _server   = server;
     _listener = listener;
 }