private void Handle(DomainMessage message)
        {
            var srv = message.Answers.FirstOrDefault(a => a.Type == RRType.SRV &&
                                                     a.Class == Class.IN &&
                                                     a.Name.EndsWith($"{_serviceType}.{_domain}."));

            if (srv == null)
            {
                return;
            }

            _logger.Debug($"Got\n{message}");

            var record  = (SRVRecord)srv.Record;
            var service = new NetworkService
            {
                Name     = srv.Name.Split('.')[0],
                Type     = _serviceType,
                Domain   = _domain,
                Port     = record.Port,
                HostName = record.Target
            };

            _logger.Info($"AddOrUpdate {service.Name}, ttl: {srv.Ttl}");
            _services.AddOrUpdate(service.Name, service, (int)srv.Ttl);
        }