private void UnsafeScheduleNext()
{
if (_workQueue.Count == 0)
{
return;
}
_cts = new CancellationTokenSource();
_currentEntry = _workQueue.Min;
CancellationToken token = _cts.Token;
Task.Delay(BoundToZero(_currentEntry.Date - DateTime.Now), _cts.Token).ContinueWith(new Action<Task>((task) =>
{
lock(this)
{
if (!token.IsCancellationRequested)
{
_currentEntry.RunTask();
_workQueue.Remove(_currentEntry);
UnsafeScheduleNext();
}
}
}),
_cts.Token,
TaskContinuationOptions.OnlyOnRanToCompletion,
TaskScheduler.Default);
}
public SchedulerEntry Add(DateTime date, Action action)
{
lock (this)
{
SchedulerEntry entry = new SchedulerEntry(date, action);
_workQueue.Add(date, entry);
if (_currentEntry != _workQueue.Min)
{
if (_currentEntry != null)
{
UnsafeCancelCurrent();
}
UnsafeScheduleNext();
}
return entry;
}
}
private void UnsafeCancelCurrent()
{
_cts.Cancel();
_currentEntry = null;
_cts = null;
}
