private static ActorScheduleOptions RemoveFlag(ActorScheduleOptions options, ActorScheduleOptions toRemove)
{
if (options.HasFlag(toRemove))
{
return(options ^ toRemove);
}
else
{
return(options);
}
}
public void ShouldBeAbleToScheduleWorkToRepeatAtAFixedInterval(WorkType workType, ActorScheduleOptions actorScheduleOptions)
{
var barrier = new TaskCompletionSource <bool>();
var expectedInterval = TimeSpan.FromMilliseconds(100);
var times = new List <DateTime>();
var sampleSize = 5;
void Adder()
{
if (times.Count < sampleSize)
{
times.Add(DateTime.UtcNow);
}
if (times.Count == sampleSize)
{
// Block here so that we can assess something that's not moving
barrier.Task.Wait();
}
}
switch (workType)
{
case WorkType.Sync:
_scheduler.Schedule((Action)Adder, expectedInterval, actorScheduleOptions);
break;
case WorkType.Async:
_scheduler.Schedule(async() =>
{
await Task.Yield();
Adder();
},
expectedInterval,
actorScheduleOptions);
break;
default:
throw new Exception($"Unhandled test case {workType}.");
}
Within.FiveSeconds(() => times.Count.Should().Be(sampleSize));
var actualIntervals = times.Take(sampleSize - 1).Zip(times.Skip(1), (x, y) => y - x).ToList();
// Use 75ms instead of 100ms to give it a bit of latitude: mainly we just want to make sure there is some delaying going on.
actualIntervals.Should().OnlyContain(x => x >= TimeSpan.FromMilliseconds(75));
barrier.SetResult(true);
}
/// <summary>
/// A wrapper round IActorWorkScheduler.Schedule() that reschedules work after an unxexpected error has occurred in that work.
/// </summary>
/// <param name="self">The schedule.</param>
/// <param name="work">The work to perform repeatedly.</param>
/// <param name="interval">Interval at which the work is to be repeated.</param>
/// <param name="options">Options. See <see cref="ActorScheduleOptions"/> for details.</param>
/// <param name="unexpectedErrorHandler">Handler for any unexpected exception.</param>
/// <returns>A task: the only possible completion is due to cancellation.</returns>
public static Task Schedule(this IActorWorkScheduler self, Func <Task> work, TimeSpan interval, ActorScheduleOptions options, Action <Exception> unexpectedErrorHandler)
{
return(ScheduleImpl(self.Schedule(work, interval, options), () => self.Schedule(work, interval, RemoveFlag(options, ActorScheduleOptions.NoInitialDelay)), unexpectedErrorHandler));
}