public void StartListening(GapDetection onGapDetection)
{
if (client != null)
{
return;
}
client = new HttpClient {
BaseAddress = new Uri(cameraId)
};
client.DefaultRequestHeaders
.Accept
.Add(new MediaTypeWithQualityHeaderValue("application/json"));
customEvent = onGapDetection;
GapDetectionEvent += customEvent;
// and notify the listener
try
{
gapDetectionTimer = ThreadPoolTimer.CreatePeriodicTimer(BackgoundListen, timerPeriod);
}
catch (Exception e)
{
Debug.WriteLine($"{e.Message}");
}
}
public void StopListening()
{
try
{
if (client == null)
{
return;
}
GapDetectionEvent -= customEvent;
customEvent = null;
client = null;
gapDetectionTimer?.Cancel();
}
catch (Exception e)
{
Debug.WriteLine($"{e.Message}");
}
}
public async void StartListening(GapDetection detectionEvent)
{
if (gapDetectionEvent != null)
{
return;
}
try
{
var connectionString =
new EventHubsConnectionStringBuilder(
new Uri(GapConfig.EventHubsCompatibleEndpoint),
GapConfig.EventHubsCompatiblePath,
GapConfig.IotHubSasKeyName,
GapConfig.IotHubSasKey);
eventHubClient = EventHubClient.CreateFromConnectionString(connectionString.ToString());
// Create a PartitionReciever for each partition on the hub.
var runtimeInfo = await eventHubClient.GetRuntimeInformationAsync();
var d2cPartitions = runtimeInfo.PartitionIds;
// TODO: listening on partition 0 only.
receivers =
d2cPartitions
.Select(d2c => eventHubClient.CreateReceiver("$Default", d2c, EventPosition.FromEnqueuedTime(DateTime.Now)))
.ToList();
gapTimer = ThreadPoolTimer.CreatePeriodicTimer(BackgroundListen, timerPeriod);
GapDetectionEvent += detectionEvent;
gapDetectionEvent = detectionEvent;
}
catch (Exception e)
{
Debug.WriteLine(e.ToString());
}
}
public void StopListening()
{
try
{
if (gapDetectionEvent == null)
{
return;
}
gapDetectionEvent -= gapDetectionEvent;
receivers.ForEach(r => r.Close());
eventHubClient.Close();
eventHubClient = null;
gapDetectionEvent = null;
gapTimer?.Cancel();
}
catch (Exception e)
{
Debug.WriteLine($"{e.Message}");
}
}
