public void QuickPulseQuotaTrackerIsThreadSafe()
{
// ARRANGE
int maxQuota = 100 * 60;
int experimentLengthInSeconds = 1000;
int concurrency = 1000;
var mockTimeProvider = new ClockMock();
var quotaTracker = new QuickPulseQuotaTracker(mockTimeProvider, maxQuota, 0);
var quotaApplicationResults = new ConcurrentQueue<bool>();
// ACT
for (int i = 0; i < experimentLengthInSeconds; i++)
{
mockTimeProvider.FastForward(TimeSpan.FromSeconds(1));
var tasks = new List<Action>();
for (int j = 0; j < concurrency; j++)
{
tasks.Add(() => quotaApplicationResults.Enqueue(quotaTracker.ApplyQuota()));
}
Parallel.Invoke(new ParallelOptions() { MaxDegreeOfParallelism = concurrency }, tasks.ToArray());
}
// ASSERT
var passedQuotaCount = quotaApplicationResults.Count(result => result);
var correctResult = maxQuota / 60 * experimentLengthInSeconds;
Assert.AreEqual(correctResult, passedQuotaCount);
Assert.IsFalse(quotaTracker.ApplyQuota());
}
public void QuickPulseQuotaTrackerQuotaDoesNotExceedMax()
{
// ARRANGE
int startQuota = 10;
int maxQuota = 30;
var mockTimeProvider = new ClockMock();
QuickPulseQuotaTracker quotaTracker = new QuickPulseQuotaTracker(mockTimeProvider, maxQuota, startQuota);
bool counted;
mockTimeProvider.FastForward(TimeSpan.FromDays(1));
// ACT & ASSERT
while (maxQuota > 0)
{
counted = quotaTracker.ApplyQuota();
Assert.IsTrue(counted);
--maxQuota;
}
counted = quotaTracker.ApplyQuota();
Assert.IsFalse(counted); // We should exhaust quota by this time
}
public void QuickPulseQuotaTrackerQuotaGetsRefilled()
{
// ARRANGE
var mockTimeProvider = new ClockMock();
QuickPulseQuotaTracker quotaTracker = new QuickPulseQuotaTracker(mockTimeProvider, 30, 0);
bool counted;
// ACT & ASSERT
counted = quotaTracker.ApplyQuota();
Assert.IsFalse(counted); // No quota yet
mockTimeProvider.FastForward(TimeSpan.FromSeconds(1)); // 0.5 quota accumulated
counted = quotaTracker.ApplyQuota();
Assert.IsFalse(counted); // No quota yet
mockTimeProvider.FastForward(TimeSpan.FromSeconds(1)); // 1 quota accumulated
counted = quotaTracker.ApplyQuota();
Assert.IsTrue(counted);
counted = quotaTracker.ApplyQuota();
Assert.IsFalse(counted); // Quota was already exhausted.
}
public void QuickPulseQuotaTrackerShouldNotGetBursts()
{
// ARRANGE
int maxQuota = 30;
var mockTimeProvider = new ClockMock();
QuickPulseQuotaTracker quotaTracker = new QuickPulseQuotaTracker(mockTimeProvider, maxQuota, 0);
mockTimeProvider.FastForward(TimeSpan.FromSeconds(1));
// ACT & ASSERT
// Emulate that every second we try to track 100 of documents. We should expect
// only one document every 2nd second (quota = 30 documents per min).
for (int i = 0; i < 1000; i++)
{
int count = 0;
for (int j = 0; j < 100; j++)
{
bool counted = quotaTracker.ApplyQuota();
if (counted)
{
++count;
}
}
Assert.AreEqual((i % 2) == 0 ? 0 : 1, count);
mockTimeProvider.FastForward(TimeSpan.FromSeconds(1));
}
}
public void QuickPulseQuotaTrackerQuotaNotEmptyAtStart()
{
// ARRANGE
int startQuota = 10;
bool counted;
var mockTimeProvider = new ClockMock();
QuickPulseQuotaTracker quotaTracker = new QuickPulseQuotaTracker(mockTimeProvider, 30, startQuota);
// ACT & ASSERT
while (startQuota > 0)
{
counted = quotaTracker.ApplyQuota();
Assert.IsTrue(counted);
--startQuota;
}
// Quota should be exhausted.
counted = quotaTracker.ApplyQuota();
Assert.IsFalse(counted);
}