private void Monitor()
{
while (true)
{
if (_processDnsResultHasEverBeenCalled && _cluster.ShouldDnsMonitorStop())
{
return;
}
List <SrvRecord> srvRecords = null;
try
{
srvRecords = _dnsResolver.ResolveSrvRecords(_service, _cancellationToken);
}
catch (Exception exception)
{
if (!_processDnsResultHasEverBeenCalled)
{
_cluster.ProcessDnsException(exception);
}
}
if (srvRecords != null)
{
var endPoints = GetValidEndPoints(srvRecords);
if (endPoints.Count > 0)
{
_cluster.ProcessDnsResults(endPoints);
_processDnsResultHasEverBeenCalled = true;
}
else
{
if (_sdamInformationEventHandler != null)
{
var message = $"A DNS SRV query on \"{_service}\" returned no valid hosts.";
var sdamInformationEvent = new SdamInformationEvent(() => message);
_sdamInformationEventHandler(sdamInformationEvent);
}
}
}
if (_cluster.ShouldDnsMonitorStop())
{
return;
}
_cancellationToken.ThrowIfCancellationRequested();
var delay = ComputeRescanDelay(srvRecords);
Thread.Sleep(delay);
}
}
