public void MeterCanCalculateMeanRate()
{
TestClock clock = new TestClock();
TestScheduler scheduler = new TestScheduler(clock);
var meter = new MeterMetric(clock, scheduler);
meter.Mark();
clock.Advance(TimeUnit.Seconds, 1);
meter.Value.MeanRate.Should().Be(1);
clock.Advance(TimeUnit.Seconds, 1);
meter.Value.MeanRate.Should().Be(0.5);
}
public void TimerContextRecordsTimeOnlyOnFirstDispose()
{
TestClock clock = new TestClock();
TestScheduler scheduler = new TestScheduler(clock);
TimerMetric timer = new TimerMetric(SamplingType.LongTerm, new MeterMetric(clock, scheduler), clock);
var context = timer.NewContext();
clock.Advance(TimeUnit.Milliseconds, 100);
using (context) { }
clock.Advance(TimeUnit.Milliseconds, 100);
using (context) { }
timer.Value.Histogram.Count.Should().Be(1);
timer.Value.Histogram.Max.Should().Be(TimeUnit.Milliseconds.ToNanoseconds(100));
}
public void EDRlongPeriodsOfInactivityShouldNotCorruptSamplingState()
{
TestClock clock = new TestClock();
TestScheduler scheduler = new TestScheduler(clock);
ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(10, 0.015, clock, scheduler);
// add 1000 values at a rate of 10 values/second
for (int i = 0; i < 1000; i++)
{
reservoir.Update(1000 + i);
clock.Advance(TimeUnit.Milliseconds, 100);
}
reservoir.Snapshot.Size.Should().Be(10);
reservoir.Snapshot.Values.Should().OnlyContain(v => 1000 <= v && v < 2000);
// wait for 15 hours and add another value.
// this should trigger a rescale. Note that the number of samples will be reduced to 2
// because of the very small scaling factor that will make all existing priorities equal to
// zero after rescale.
clock.Advance(TimeUnit.Hours, 15);
reservoir.Update(2000);
var snapshot = reservoir.Snapshot;
snapshot.Size.Should().Be(2);
snapshot.Values.Should().OnlyContain(v => 1000 <= v && v < 3000);
// add 1000 values at a rate of 10 values/second
for (int i = 0; i < 1000; i++)
{
reservoir.Update(3000 + i);
clock.Advance(TimeUnit.Milliseconds, 100);
}
var finalSnapshot = reservoir.Snapshot;
finalSnapshot.Size.Should().Be(10);
// TODO: double check the Skip first value - sometimes first value is 2000 - which might or not be correct
finalSnapshot.Values.Skip(1).Should().OnlyContain(v => 3000 <= v && v < 4000);
}
public void TimerCanTrackTime()
{
TestClock clock = new TestClock();
TestScheduler scheduler = new TestScheduler(clock);
TimerMetric timer = new TimerMetric(SamplingType.LongTerm, new MeterMetric(clock, scheduler), clock);
using (timer.NewContext())
{
clock.Advance(TimeUnit.Milliseconds, 100);
}
timer.Value.Histogram.Count.Should().Be(1);
timer.Value.Histogram.Max.Should().Be(TimeUnit.Milliseconds.ToNanoseconds(100));
}
public void MeterCanComputeRates()
{
TestClock clock = new TestClock();
TestScheduler scheduler = new TestScheduler(clock);
var meter = new MeterMetric(clock, scheduler);
meter.Mark();
clock.Advance(TimeUnit.Seconds, 10);
meter.Mark(2);
var value = meter.Value;
value.MeanRate.Should().BeApproximately(0.3, 0.001);
value.OneMinuteRate.Should().BeApproximately(0.1840, 0.001);
value.FiveMinuteRate.Should().BeApproximately(0.1966, 0.001);
value.FifteenMinuteRate.Should().BeApproximately(0.1988, 0.001);
}
