private void OnTimerTick(object obj)
{
var start = DateTime.UtcNow;
string fullImagePath = null;
string croppedImagePath = null;
try
{
fullImagePath = _cameraFeedService.GetPhoto();
string currentStatus = null;
if (File.Exists(_options.StatusFilePath))
{
currentStatus = File.ReadAllText(_options.StatusFilePath);
}
croppedImagePath = GetCroppedImagePath(fullImagePath);
var newStatus = _imageClassifier.ClassifyImage(croppedImagePath);
if (currentStatus != newStatus)
{
_slackNotifier.SendNotification($"Status changed from {currentStatus} to {newStatus}",
fullImagePath);
File.WriteAllText(_options.StatusFilePath, newStatus);
}
successful++;
if (successful == 1)
{
Log.Logger.Information("Successfully processed the first image");
}
}
catch (Exception e)
{
failed++;
Serilog.Log.Error($"Error getting image and classifying it. {e.Message}\n{e.StackTrace}", e);
}
finally
{
var now = DateTime.UtcNow;
var nextRunTime = start.Add(TimeSpan.FromSeconds(_options.IntervalSeconds));
var delayTimespan = nextRunTime > now?nextRunTime.Subtract(now) : TimeSpan.Zero;
_timer.Change(delayTimespan, Timeout.InfiniteTimeSpan);
}
SafeDeleteFile(fullImagePath);
SafeDeleteFile(croppedImagePath);
}
public Task <int> StartWorker(CancellationToken cancellationToken)
{
var taskCompletionSource = new TaskCompletionSource <int>();
_thread = new Thread(() =>
{
try
{
_classifier.LoadModel();
}
catch (ModelNotLoadedException exception)
{
taskCompletionSource.SetException(exception);
return;
}
taskCompletionSource.SetResult(0);
while (!_isCanceled)
{
IImageClassificationTask classificationTask;
try
{
classificationTask = _queue.Receive(cancellationToken);
}
catch (OperationCanceledException)
{
_isCanceled = true;
return;
}
string label;
try
{
label = _classifier.ClassifyImage(classificationTask.Image);
}
catch (ModelEvaluationFailedException exception)
{
classificationTask.TaskCompletionSource.SetException(exception);
return;
}
classificationTask.TaskCompletionSource.SetResult(label);
_isCanceled = cancellationToken.IsCancellationRequested;
}
});
_thread.Start();
return(taskCompletionSource.Task);
}