public async Task ProcessTasksAsync(ICollection <ThumbnailTask> tasks, bool regenerate, Action <ThumbnailTaskProgress> progressCallback, ICancellationToken token)
{
var progressInfo = new ThumbnailTaskProgress {
Message = "Reading the tasks..."
};
if (_imageChangesProvider.IsTotalCountSupported)
{
foreach (var task in tasks)
{
var changedSince = regenerate ? null : task.LastRun;
progressInfo.TotalCount = await _imageChangesProvider.GetTotalChangesCount(task, changedSince, token);
}
}
progressCallback(progressInfo);
var pageSize = _settingsManager.GetValue(ModuleConstants.Settings.General.ProcessBatchSize.Name, 50);
foreach (var task in tasks)
{
progressInfo.Message = $"Procesing task {task.Name}...";
progressCallback(progressInfo);
var skip = 0;
while (true)
{
var changes = await _imageChangesProvider.GetNextChangesBatch(task, regenerate?null : task.LastRun, skip, pageSize, token);
if (!changes.Any())
{
break;
}
foreach (var fileChange in changes)
{
var result = await _generator.GenerateThumbnailsAsync(fileChange.Url, task.WorkPath, task.ThumbnailOptions, token);
progressInfo.ProcessedCount++;
if (!result.Errors.IsNullOrEmpty())
{
progressInfo.Errors.AddRange(result.Errors);
}
}
skip += changes.Length;
progressCallback(progressInfo);
token?.ThrowIfCancellationRequested();
}
}
progressInfo.Message = "Finished generating thumbnails!";
progressCallback(progressInfo);
}
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);
}
