public void long_period_of_inactivity_should_not_corrupt_sampling_state() {
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var resevoir = new ExponentiallyDecayingResevoir(10, 0.015, clock);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++) {
resevoir.Update(1000 + i);
clock.TickNow(100);
}
AssertAllValuesBetween(resevoir, 1000, 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 factor that will make all
// existing priorities equal to zero after rescale.
clock.TickNow(15*60*60*1000);
resevoir.Update(2000);
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(2));
AssertAllValuesBetween(resevoir, 1000, 3000);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++) {
resevoir.Update(3000 + i);
clock.TickNow(100);
}
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(10));
AssertAllValuesBetween(resevoir, 3000, 4000);
}
public void AssertAllValuesBetween(ExponentiallyDecayingResevoir resevoir,
long min, long max) {
Snapshot snapshot = resevoir.Snapshot;
foreach (var value in snapshot.Values) {
Assert.That(value, Is.InRange(min, max));
}
}
public void long_period_of_inactivity_should_not_corrupt_sampling_state()
{
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var resevoir = new ExponentiallyDecayingResevoir(10, 0.015, clock);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++)
{
resevoir.Update(1000 + i);
clock.TickNow(100);
}
AssertAllValuesBetween(resevoir, 1000, 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 factor that will make all
// existing priorities equal to zero after rescale.
clock.TickNow(15 * 60 * 60 * 1000);
resevoir.Update(2000);
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(2));
AssertAllValuesBetween(resevoir, 1000, 3000);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++)
{
resevoir.Update(3000 + i);
clock.TickNow(100);
}
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(10));
AssertAllValuesBetween(resevoir, 3000, 4000);
}
public void AssertAllValuesBetween(ExponentiallyDecayingResevoir resevoir,
long min, long max)
{
Snapshot snapshot = resevoir.Snapshot;
foreach (var value in snapshot.Values)
{
Assert.That(value, Is.InRange(min, max));
}
}
public void should_get_the_recorded_size_when_recording_less_than_capacity() {
var resevoir = new ExponentiallyDecayingResevoir(100, 0.99);
for (int i = 0; i < 99; i++) {
resevoir.Update(i);
}
Snapshot snapshot = resevoir.Snapshot;
Assert.That(resevoir.Size, Is.EqualTo(99));
Assert.That(snapshot.Size, Is.EqualTo(99));
foreach (var value in snapshot.Values) {
Assert.That(value, Is.LessThan(1000).And.GreaterThanOrEqualTo(0));
}
}
public void should_get_the_resevoir_size_when_recording_more_than_capacity() {
var resevoir = new ExponentiallyDecayingResevoir(100, 0.99);
for (int i = 0; i < 1000; i++) {
resevoir.Update(i);
}
Snapshot snapshot = resevoir.Snapshot;
Assert.That(resevoir.Size, Is.EqualTo(100),
"Resevoir size is not equals to defined");
Assert.That(snapshot.Size, Is.EqualTo(100),
"Snapshot size is different from the resevoit size");
foreach (var value in snapshot.Values) {
Assert.That(value, Is.LessThan(1000).And.GreaterThanOrEqualTo(0));
}
}
public void should_get_the_recorded_size_when_recording_less_than_capacity()
{
var resevoir = new ExponentiallyDecayingResevoir(100, 0.99);
for (int i = 0; i < 99; i++)
{
resevoir.Update(i);
}
Snapshot snapshot = resevoir.Snapshot;
Assert.That(resevoir.Size, Is.EqualTo(99));
Assert.That(snapshot.Size, Is.EqualTo(99));
foreach (var value in snapshot.Values)
{
Assert.That(value, Is.LessThan(1000).And.GreaterThanOrEqualTo(0));
}
}
public void should_get_the_resevoir_size_when_recording_more_than_capacity()
{
var resevoir = new ExponentiallyDecayingResevoir(100, 0.99);
for (int i = 0; i < 1000; i++)
{
resevoir.Update(i);
}
Snapshot snapshot = resevoir.Snapshot;
Assert.That(resevoir.Size, Is.EqualTo(100),
"Resevoir size is not equals to defined");
Assert.That(snapshot.Size, Is.EqualTo(100),
"Snapshot size is different from the resevoit size");
foreach (var value in snapshot.Values)
{
Assert.That(value, Is.LessThan(1000).And.GreaterThanOrEqualTo(0));
}
}
