public async Task ManyWaitsStackUp()
{
await Policy
.Handle <ShouldAssertException>()
.RetryAsync(3)
.ExecuteAsync(async() =>
{
// arrange
var limiter = new Limiter(new Limit(10), 5);
using var cancellation = new CancellationTokenSource(TimeSpan.FromSeconds(5));
// act
while (cancellation.IsCancellationRequested == false)
{
var task = limiter.WaitAsync(cancellation.Token);
if (!task.IsCompleted)
{
await task.ConfigureAwait(false);
break;
}
}
var delayOne = new Stopwatch();
delayOne.Start();
var delayTwo = new Stopwatch();
delayTwo.Start();
var delayThree = new Stopwatch();
delayThree.Start();
var waits = new List <Task>
{
limiter.WaitAsync(cancellation.Token),
limiter.WaitAsync(cancellation.Token),
limiter.WaitAsync(cancellation.Token),
};
var taskOne = await Task.WhenAny(waits.ToArray()).ConfigureAwait(false);
await taskOne.ConfigureAwait(false);
delayOne.Stop();
waits.Remove(taskOne);
var taskTwo = await Task.WhenAny(waits.ToArray()).ConfigureAwait(false);
await taskTwo.ConfigureAwait(false);
delayTwo.Stop();
waits.Remove(taskTwo);
var taskThree = await Task.WhenAny(waits.ToArray()).ConfigureAwait(false);
await taskThree.ConfigureAwait(false);
delayThree.Stop();
waits.Remove(taskThree);
// assert
delayOne.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(100), tolerance: TimeSpan.FromMilliseconds(25));
delayTwo.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(200), tolerance: TimeSpan.FromMilliseconds(25));
delayThree.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(300), tolerance: TimeSpan.FromMilliseconds(25));
}).ConfigureAwait(false);
}
public async Task WaitAsyncCausesPauseLikeReserve()
{
// arrange
var limiter = new Limiter(new Limit(10), 5);
using var cancellation = new CancellationTokenSource(TimeSpan.FromSeconds(5));
// act
while (cancellation.IsCancellationRequested == false)
{
var task = limiter.WaitAsync(cancellation.Token);
if (!task.IsCompleted)
{
await task.ConfigureAwait(false);
break;
}
}
var delayOne = new Stopwatch();
delayOne.Start();
await limiter.WaitAsync(cancellation.Token).ConfigureAwait(false);
delayOne.Stop();
var delayTwoMore = new Stopwatch();
delayTwoMore.Start();
await limiter.WaitAsync(2, cancellation.Token).ConfigureAwait(false);
delayTwoMore.Stop();
await Task.Delay(TimeSpan.FromMilliseconds(150)).ConfigureAwait(false);
var delayAlreadyAvailable = new Stopwatch();
delayAlreadyAvailable.Start();
await limiter.WaitAsync(cancellation.Token).ConfigureAwait(false);
delayAlreadyAvailable.Stop();
var delayHalfAvailable = new Stopwatch();
delayHalfAvailable.Start();
await limiter.WaitAsync(cancellation.Token).ConfigureAwait(false);
delayHalfAvailable.Stop();
// assert
delayOne.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(100), tolerance: TimeSpan.FromMilliseconds(25));
delayTwoMore.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(200), tolerance: TimeSpan.FromMilliseconds(25));
delayAlreadyAvailable.Elapsed.ShouldBe(TimeSpan.Zero, tolerance: TimeSpan.FromMilliseconds(5));
delayHalfAvailable.Elapsed.ShouldBe(TimeSpan.FromMilliseconds(50), tolerance: TimeSpan.FromMilliseconds(25));
}