private async Task StartListenPropertiesChange(DeviceClient deviceClient)
{
var retryCountRemain = _retryCount;
while (true)
{
try
{
var beforeStartGetTwinTimeStamp = DateTime.Now;
var twin = await deviceClient.GetTwinAsync();
var afterGetTwinTimeStamp = DateTime.Now;
((BaseDiagnosticProvider)_diagnosticProvider).SetSamplingConfigFromTwin(twin.Properties.Desired);
Console.WriteLine($"Automatically obtain twin settings from server when start. GetTwinTimeConsume: {(afterGetTwinTimeStamp-beforeStartGetTwinTimeStamp).TotalMilliseconds}");
await deviceClient.SetDesiredPropertyUpdateCallback(((BaseDiagnosticProvider)_diagnosticProvider).OnDesiredPropertyChange, null);
break;
}
catch (Exception e)
{
retryCountRemain--;
var randomDelayTime = new Random().Next(_retryAfterMilisecondLowerBound, _retryAfterMilisecondUpperBound);
await Task.Delay(randomDelayTime);
if (retryCountRemain < 0)
{
Console.WriteLine("Error occur when get twin settings from server:\n" + e.Message + "\nStop retry and ignore diagnostic.");
break;
}
Console.WriteLine("Error occur when get twin settings from server:\n" + e.Message + "\nRetry...");
}
}
}
public Task SetDesiredPropertyUpdateCallback(DesiredPropertyUpdateCallback callback, object userContext)
{
_userDesiredPropertyUpdateCallback = callback;
DesiredPropertyUpdateCallback callbackWrapper = (desiredProperties, context) =>
{
return(Task.Run(() =>
{
if (_diagnosticProvider.GetSamplingRateSource() == SamplingRateSource.Server)
{
((BaseDiagnosticProvider)_diagnosticProvider).OnDesiredPropertyChange(desiredProperties, context);
}
_userDesiredPropertyUpdateCallback(desiredProperties, context);
}));
};
this.callbackWrapper = callbackWrapper;
return(_deviceClient.SetDesiredPropertyUpdateCallback(callbackWrapper, userContext));
}