private static async Task <ClassData> LoadDataBlocking(AccountDataStore data, Guid classId, DateTime todayAsUtc, ClassTileSettings settings)
{
DateTime dateToStartDisplayingFrom = DateTime.SpecifyKind(settings.GetDateToStartDisplayingOn(todayAsUtc), DateTimeKind.Local);
Guid semesterId = Guid.Empty;
// We lock the outside, since we are allowing trackChanges on the view items groups (so we have a chance of loading a cached one)... and since we're on a background thread, the lists inside the
// view items groups could change while we're enumerating, hence throwing an exception. So we lock it to ensure this won't happen, and then we return a copy of the items that we need.
using (await Locks.LockDataForReadAsync())
{
// First we need to obtain the semester id
var c = data.TableClasses.FirstOrDefault(i => i.Identifier == classId);
if (c == null)
{
return(null);
}
semesterId = c.UpperIdentifier;
}
// We need all classes loaded, to know what time the end of day is
var scheduleViewItemsGroup = await ScheduleViewItemsGroup.LoadAsync(data.LocalAccountId, semesterId, trackChanges : true, includeWeightCategories : false);
var classViewItemsGroup = await ClassViewItemsGroup.LoadAsync(
localAccountId : data.LocalAccountId,
classId : classId,
today : DateTime.SpecifyKind(todayAsUtc, DateTimeKind.Local),
viewItemSemester : scheduleViewItemsGroup.Semester,
includeWeights : false);
classViewItemsGroup.LoadTasksAndEvents();
await classViewItemsGroup.LoadTasksAndEventsTask;
List <ViewItemTaskOrEvent> copied;
using (await classViewItemsGroup.DataChangeLock.LockForReadAsync())
{
// Class view group sorts the items, so no need to sort
copied = classViewItemsGroup.Class.TasksAndEvents.Where(i => i.Date.Date >= dateToStartDisplayingFrom).ToList();
}
return(new ClassData()
{
Class = classViewItemsGroup.Class,
AllUpcoming = copied
});
}
protected override async Task LoadAsyncOverride()
{
try
{
ViewItemsGroupClass = await ClassViewItemsGroup.LoadAsync(_localAccountId, ClassId, _today, _semester);
DetailsViewModel = new ClassDetailsViewModel(this);
HomeworkViewModel = new ClassHomeworkOrExamsViewModel(this, ClassHomeworkOrExamsViewModel.ItemType.Homework);
ExamsViewModel = new ClassHomeworkOrExamsViewModel(this, ClassHomeworkOrExamsViewModel.ItemType.Exams);
TimesViewModel = new ClassTimesViewModel(this);
GradesViewModel = new Class.ClassGradesViewModel(this);
}
catch (ClassViewItemsGroup.ClassNotFoundExcetion)
{
var parent = FindAncestor <PagedViewModel>();
parent.Replace(this, new ClassesViewModel(parent));
throw;
}
catch (Exception ex)
{
TelemetryExtension.Current?.TrackException(ex);
RemoveViewModel();
}
}