private async Task <ITaskResult> TryWaitForResultAsync(
ServiceId serviceId, MethodId routineMethodId, string intentId, TimeSpan?waitTime)
{
var cts = new CancellationTokenSource();
var completionSink = new TaskCompletionSource <ITaskResult>();
var trackingToken = _routineCompletionNotifier.NotifyOnCompletion(
serviceId, routineMethodId, intentId, completionSink, cts.Token);
ITaskResult result;
try
{
result = await completionSink.WithTimeout(waitTime).Task
.ContinueWith(t => t.IsCanceled ? null : t.Result);
}
catch (TaskCanceledException)
{
result = null;
}
finally
{
cts.Cancel();
_routineCompletionNotifier.StopTracking(trackingToken);
}
return(result);
}
/// <remarks>
/// Fire and forget mode (async void).
/// </remarks>
public async void ExecuteAndAwaitInBackground(ExecuteRoutineIntent intent, Task proxyTask)
{
// TODO: exception handling
var result = await _singleMethodInvoker.InvokeAsync(intent);
if (result.Outcome == InvocationOutcome.Complete)
{
proxyTask.TrySetResult(result.Result);
}
else
{
var tcs = new TaskCompletionSource <ITaskResult>();
_routineCompletionNotifier.NotifyOnCompletion(intent.Service, intent.Method, intent.Id, tcs, default);
var taskResult = await tcs.Task;
proxyTask.TrySetResult(taskResult);
}
}
