public async Task Process(ThumbnailsTaskRunRequest generateRequest, ThumbnailProcessNotification notifyEvent, IJobCancellationToken cancellationToken, PerformContext context)
{
try
{
Action <ThumbnailTaskProgress> progressCallback = x =>
{
notifyEvent.Description = x.Message;
notifyEvent.Errors = x.Errors;
notifyEvent.ErrorCount = notifyEvent.Errors.Count;
notifyEvent.TotalCount = x.TotalCount ?? 0;
notifyEvent.ProcessedCount = x.ProcessedCount ?? 0;
notifyEvent.JobId = context.BackgroundJob.Id;
_pushNotifier.Upsert(notifyEvent);
};
//wrap token
var tasks = _taskService.GetByIds(generateRequest.TaskIds);
var cancellationTokenWrapper = new JobCancellationTokenWrapper(cancellationToken);
await _thumbnailProcessor.ProcessTasksAsync(tasks, generateRequest.Regenerate, progressCallback, cancellationTokenWrapper);
//update tasks in case of successful generation
foreach (var task in tasks)
{
task.LastRun = DateTime.UtcNow;
}
_taskService.SaveOrUpdate(tasks);
}
catch (JobAbortedException)
{
//do nothing
}
catch (Exception ex)
{
notifyEvent.Description = "Error";
notifyEvent.ErrorCount++;
notifyEvent.Errors.Add(ex.ToString());
}
finally
{
notifyEvent.Finished = DateTime.UtcNow;
notifyEvent.Description = "Process finished" + (notifyEvent.Errors.Any() ? " with errors" : " successfully");
_pushNotifier.Upsert(notifyEvent);
}
}
private async Task PerformGeneration(IEnumerable <ThumbnailTask> tasks, bool regenerate, Action <ThumbnailTaskProgress> progressCallback, IJobCancellationToken cancellationToken)
{
var cancellationTokenWrapper = new JobCancellationTokenWrapper(cancellationToken);
foreach (var task in tasks)
{
// Better to run and save tasks one by one to save LastRun date once every task is completed, opposing to waiting all tasks completion, as it could be a long process.
var oneTaskArray = new[] { task };
//Need to save runTime at start in order to not loose changes that may be done between the moment of getting changes and the task completion.
var runTime = DateTime.UtcNow;
await _thumbnailProcessor.ProcessTasksAsync(oneTaskArray, regenerate, progressCallback, cancellationTokenWrapper);
task.LastRun = runTime;
await _taskService.SaveChangesAsync(oneTaskArray);
}
var progressInfo = new ThumbnailTaskProgress {
Message = "Finished generating thumbnails!"
};
progressCallback(progressInfo);
}