private async Task StartCoreAsync()
{
try
{
_log.Trace("Starting");
_stopCancellation.Token.ThrowIfCancellationRequested();
var processTask = await TaskRunner
.RunInBackground(
() => StartProcessAsync(_stopCancellation.Token),
_stopCancellation.Token)
.ConfigureAwait(false);
processTask.ContinueWithSynchronously((Action <Task>)OnProcessCompleted).IgnoreAwait(_log);
_startCompletion.TryComplete();
}
catch (OperationCanceledException) when(_stopCancellation.IsCancellationRequested)
{
_log.Trace("Start canceled");
_startCompletion.TryComplete();
_completion.TryComplete();
}
catch (Exception ex)
{
_log.Trace("Start failed: {0}", ex.FormatTypeAndMessage());
_startCompletion.TryFail(ex);
_completion.TryFail(ex);
throw;
}
}
private static void PropagateCompletedTaskToPromise <T>(Task <T> task, Promise <T> promise)
{
if (task.IsCanceled)
{
promise.TryCancel();
}
else if (task.IsFaulted)
{
promise.TryFail(task.Exception.InnerExceptions);
}
else
{
promise.TryComplete(task.Result);
}
}
public bool TryComplete() => _inner.TryComplete(Nothing.Instance);