public override async Task CannotAcquireResourcesWithWaitAsyncWithQueuedItemsIfOldestFirst()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 3,
TimeSpan.Zero, 2, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(2);
var wait2 = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
Assert.False(wait2.IsCompleted);
limiter.TryReplenish();
lease = await wait;
Assert.True(lease.IsAcquired);
Assert.False(wait2.IsCompleted);
limiter.TryReplenish();
lease = await wait2;
Assert.True(lease.IsAcquired);
}
public override async Task DropsMultipleOldestWhenQueuingMoreThanLimit_NewestFirst()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 2,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(2);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
var wait2 = limiter.WaitAsync(1);
Assert.False(wait2.IsCompleted);
var wait3 = limiter.WaitAsync(2);
var lease1 = await wait;
var lease2 = await wait2;
Assert.False(lease1.IsAcquired);
Assert.False(lease2.IsAcquired);
Assert.False(wait3.IsCompleted);
limiter.TryReplenish();
limiter.TryReplenish();
lease = await wait3;
Assert.True(lease.IsAcquired);
}
public override async Task CanAcquireResourceAsync_QueuesAndGrabsOldest()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = await limiter.WaitAsync();
Assert.True(lease.IsAcquired);
var wait1 = limiter.WaitAsync();
var wait2 = limiter.WaitAsync();
Assert.False(wait1.IsCompleted);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
lease = await wait1;
Assert.True(lease.IsAcquired);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.Equal(0, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
lease = await wait2;
Assert.True(lease.IsAcquired);
}
public override async Task CanAcquireResourceAsync_QueuesAndGrabsNewest()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 3,
TimeSpan.FromMinutes(0), 1, autoReplenishment: false));
var lease = await limiter.WaitAsync(2);
Assert.True(lease.IsAcquired);
var wait1 = limiter.WaitAsync(2);
var wait2 = limiter.WaitAsync();
Assert.False(wait1.IsCompleted);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
// second queued item completes first with NewestFirst
lease = await wait2;
Assert.True(lease.IsAcquired);
Assert.False(wait1.IsCompleted);
lease.Dispose();
Assert.Equal(0, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.True(limiter.TryReplenish());
lease = await wait1;
Assert.True(lease.IsAcquired);
}
public void TryReplenishHonorsTokensPerPeriod()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(7, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 3, autoReplenishment: false));
Assert.True(limiter.Acquire(5).IsAcquired);
Assert.False(limiter.Acquire(3).IsAcquired);
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(5, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(7, limiter.GetAvailablePermits());
}
public override async Task CanAcquireResourcesWithWaitAsyncWithQueuedItemsIfNewestFirst()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 2,
TimeSpan.Zero, 2, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(2);
Assert.False(wait.IsCompleted);
Assert.Equal(1, limiter.GetAvailablePermits());
lease = await limiter.WaitAsync(1).DefaultTimeout();
Assert.True(lease.IsAcquired);
Assert.False(wait.IsCompleted);
limiter.TryReplenish();
lease = await wait.DefaultTimeout();
Assert.True(lease.IsAcquired);
}
public override async Task CanDequeueMultipleResourcesAtOnce()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.Zero, 2, autoReplenishment: false));
using var lease = await limiter.WaitAsync(2).DefaultTimeout();
Assert.True(lease.IsAcquired);
var wait1 = limiter.WaitAsync(1);
var wait2 = limiter.WaitAsync(1);
Assert.False(wait1.IsCompleted);
Assert.False(wait2.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
var lease1 = await wait1.DefaultTimeout();
var lease2 = await wait2.DefaultTimeout();
Assert.True(lease1.IsAcquired);
Assert.True(lease2.IsAcquired);
}
public override async Task LargeAcquiresAndQueuesDoNotIntegerOverflow()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(int.MaxValue, QueueProcessingOrder.NewestFirst, int.MaxValue,
TimeSpan.Zero, int.MaxValue, autoReplenishment: false));
var lease = limiter.Acquire(int.MaxValue);
Assert.True(lease.IsAcquired);
// Fill queue
var wait = limiter.WaitAsync(3);
Assert.False(wait.IsCompleted);
var wait2 = limiter.WaitAsync(int.MaxValue);
Assert.False(wait2.IsCompleted);
var lease1 = await wait;
Assert.False(lease1.IsAcquired);
limiter.TryReplenish();
var lease2 = await wait2;
Assert.True(lease2.IsAcquired);
}
public override async Task CanFillQueueWithNewestFirstAfterCancelingQueuedRequestWithAnotherQueuedRequest()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 2,
TimeSpan.Zero, 2, autoReplenishment: false));
var lease = limiter.Acquire(2);
Assert.True(lease.IsAcquired);
var cts = new CancellationTokenSource();
var wait = limiter.WaitAndAcquireAsync(1, cts.Token);
// Add another item to queue, will be completed as failed later when we queue another item
var wait2 = limiter.WaitAndAcquireAsync(1);
Assert.False(wait.IsCompleted);
cts.Cancel();
var ex = await Assert.ThrowsAsync <TaskCanceledException>(() => wait.AsTask());
Assert.Equal(cts.Token, ex.CancellationToken);
lease.Dispose();
var wait3 = limiter.WaitAndAcquireAsync(2);
Assert.False(wait3.IsCompleted);
// will be kicked by wait3 because we're using NewestFirst
lease = await wait2;
Assert.False(lease.IsAcquired);
limiter.TryReplenish();
lease = await wait3;
Assert.True(lease.IsAcquired);
}
public void TryReplenishWithAllTokensAvailable_Noops()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.True(limiter.TryReplenish());
Assert.Equal(2, limiter.GetAvailablePermits());
}
public void TryReplenishWithAutoReplenish_ReturnsFalse()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.FromSeconds(1), 1, autoReplenishment: true));
Assert.Equal(2, limiter.GetAvailablePermits());
Assert.False(limiter.TryReplenish());
Assert.Equal(2, limiter.GetAvailablePermits());
}
public override void IdleDurationUpdatesWhenChangingFromActive()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 2,
TimeSpan.Zero, 1, autoReplenishment: false));
limiter.Acquire(1);
limiter.TryReplenish();
Assert.NotNull(limiter.IdleDuration);
}
public override async Task QueueAvailableAfterQueueLimitHitAndResources_BecomeAvailable()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(1);
var wait = limiter.WaitAsync(1);
var failedLease = await limiter.WaitAsync(1);
Assert.False(failedLease.IsAcquired);
limiter.TryReplenish();
lease = await wait;
Assert.True(lease.IsAcquired);
wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
limiter.TryReplenish();
lease = await wait;
Assert.True(lease.IsAcquired);
}
public override void CanAcquireResource()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.NewestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire();
Assert.True(lease.IsAcquired);
Assert.False(limiter.Acquire().IsAcquired);
lease.Dispose();
Assert.False(limiter.Acquire().IsAcquired);
Assert.True(limiter.TryReplenish());
Assert.True(limiter.Acquire().IsAcquired);
}
public override async Task CanAcquireResourceAsync()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.NewestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
using var lease = await limiter.WaitAsync();
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync();
Assert.False(wait.IsCompleted);
Assert.True(limiter.TryReplenish());
Assert.True((await wait).IsAcquired);
}
public override async Task WaitAsyncZero_WithoutAvailabilityWaitsForAvailability()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.NewestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = await limiter.WaitAsync(1);
Assert.True(lease.IsAcquired);
var wait = limiter.WaitAsync(0);
Assert.False(wait.IsCompleted);
lease.Dispose();
Assert.True(limiter.TryReplenish());
using var lease2 = await wait;
Assert.True(lease2.IsAcquired);
}
public override async Task CanCancelWaitAsyncBeforeQueuing()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var cts = new CancellationTokenSource();
cts.Cancel();
await Assert.ThrowsAsync <TaskCanceledException>(() => limiter.WaitAsync(1, cts.Token).AsTask());
lease.Dispose();
Assert.True(limiter.TryReplenish());
Assert.Equal(1, limiter.GetAvailablePermits());
}
public override async Task DropsRequestedLeaseIfPermitCountGreaterThanQueueLimitAndNoAvailability_NewestFirst()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(2, QueueProcessingOrder.NewestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(2);
Assert.True(lease.IsAcquired);
// Fill queue
var wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
var lease1 = await limiter.WaitAsync(2);
Assert.False(lease1.IsAcquired);
limiter.TryReplenish();
lease = await wait;
Assert.True(lease.IsAcquired);
}
public override async Task CancelUpdatesQueueLimit()
{
var limiter = new TokenBucketRateLimiter(new TokenBucketRateLimiterOptions(1, QueueProcessingOrder.OldestFirst, 1,
TimeSpan.Zero, 1, autoReplenishment: false));
var lease = limiter.Acquire(1);
Assert.True(lease.IsAcquired);
var cts = new CancellationTokenSource();
var wait = limiter.WaitAsync(1, cts.Token);
cts.Cancel();
var ex = await Assert.ThrowsAsync <TaskCanceledException>(() => wait.AsTask());
Assert.Equal(cts.Token, ex.CancellationToken);
wait = limiter.WaitAsync(1);
Assert.False(wait.IsCompleted);
limiter.TryReplenish();
lease = await wait;
Assert.True(lease.IsAcquired);
}
