public void Execute(object parameter)
{
ITaskProgressionInfo prog = null;
switch (parameter)
{
case IEnumerable <ItemEx> items:
prog = thumbnailManagementService.CreateAndLinkThumbnail(items.ToArray());
break;
case ItemEx item:
Observable.Start(
() => thumbnailManagementService.CreateAndLinkThumbnail(item),
RxApp.TaskpoolScheduler
);
break;
case null:
throw new NotImplementedException($"{nameof(CreateThumbnailsCommand)}.{nameof(Execute)}: creating thumbnails for all items is not supported yet");
//prog = thumbnailManagementService.CreateAndLinkThumbnail();
//break;
default:
throw new NotImplementedException($"{nameof(CreateThumbnailsCommand)}.{nameof(Execute)}: invalid parameter {parameter}");
}
prog.ErrorChanges.TakeUntil(prog.DoneChanges).Where(ex => ex != null).Subscribe(ex => MessageBox.Show(ex?.ToString(), "thumbnails could not be created"));
}
public static IEnumerable <IObservable <IEnumerable <Tout> > > SelectAsync <Tin, Tout>(this IEnumerable <Tin> list, Func <Tin, Tout> selector, int chunkSize, out ITaskProgressionInfo progress)
{
var prog = new TaskProgression()
{
State = TaskState.Todo
};
var chunkCount = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(list.Count()) / chunkSize));
var res = getSubjectList <IEnumerable <Tout> >(chunkCount);
progress = prog;
Observable.Start(() =>
{
try
{
prog.State = TaskState.InProgress;
var chunks = list.ChunkBy(chunkSize).ToArray();
prog.RequiredProgress = chunks.Length;
var i = 0;
foreach (var chunk in chunks)
{
res.ElementAt(i).OnNext(chunk.Select(selector).ToArray());
prog.CurrentProgress++;
i++;
}
prog.State = TaskState.Done;
}
catch (Exception ex)
{
prog.Details = "failed: " + ex.ToString();
prog.Error = ex;
prog.State = TaskState.Failed;
}
}, RxApp.TaskpoolScheduler);
return(res);
}