public void testRolling()
{
MockedClock time = new MockedClock();
RollingPercentileNumber p = new RollingPercentileNumber(time, timeInMilliseconds, numberOfBuckets, bucketDataLength, DynamicProperties.Factory.AsProperty(true));
p.AddValue(1000);
p.AddValue(1000);
p.AddValue(1000);
p.AddValue(2000);
Assert.Equal(1, p.GetBuckets().Count());
// no bucket turnover yet so percentile not yet generated
Assert.Equal(0, p.GetPercentile(50));
time.Increment(6000);
// still only 1 bucket until we touch it again
Assert.Equal(1, p.GetBuckets().Count());
// a bucket has been created so we have a new percentile
Assert.Equal(1000, p.GetPercentile(50));
// now 2 buckets since getting a percentile causes bucket retrieval
Assert.Equal(2, p.GetBuckets().Count());
p.AddValue(1000);
p.AddValue(500);
// should still be 2 buckets
Assert.Equal(2, p.GetBuckets().Count());
p.AddValue(200);
p.AddValue(200);
p.AddValue(1600);
p.AddValue(200);
p.AddValue(1600);
p.AddValue(1600);
// we haven't progressed to a new bucket so the percentile should be the same and ignore the most recent bucket
Assert.Equal(1000, p.GetPercentile(50));
// Increment to another bucket so we include all of the above in the PercentileSnapshot
time.Increment(6000);
// the rolling version should have the same data as creating a snapshot like this
PercentileSnapshot ps = new PercentileSnapshot(1000, 1000, 1000, 2000, 1000, 500, 200, 200, 1600, 200, 1600, 1600);
Assert.Equal(ps.GetPercentile(0.15), p.GetPercentile(0.15));
Assert.Equal(ps.GetPercentile(0.50), p.GetPercentile(0.50));
Assert.Equal(ps.GetPercentile(0.90), p.GetPercentile(0.90));
Assert.Equal(ps.GetPercentile(0.995), p.GetPercentile(0.995));
//Console.WriteLine("100th: " + ps.GetPercentile(100) + " " + p.GetPercentile(100));
//Console.WriteLine("99.5th: " + ps.GetPercentile(99.5) + " " + p.GetPercentile(99.5));
//Console.WriteLine("99th: " + ps.GetPercentile(99) + " " + p.GetPercentile(99));
//Console.WriteLine("90th: " + ps.GetPercentile(90) + " " + p.GetPercentile(90));
//Console.WriteLine("50th: " + ps.GetPercentile(50) + " " + p.GetPercentile(50));
//Console.WriteLine("10th: " + ps.GetPercentile(10) + " " + p.GetPercentile(10));
// mean = 1000+1000+1000+2000+1000+500+200+200+1600+200+1600+1600/12
Assert.Equal(991, ps.Mean);
}
public void testValueIsZeroAfterRollingWindowPassesAndNoTraffic()
{
MockedClock time = new MockedClock();
var p = new RollingPercentileNumber(time, timeInMilliseconds, numberOfBuckets, bucketDataLength, DynamicProperties.Factory.AsProperty(true));
p.AddValue(1000);
p.AddValue(1000);
p.AddValue(1000);
p.AddValue(2000);
p.AddValue(4000);
Assert.Equal(1, p.GetBuckets().Count());
// no bucket turnover yet so percentile not yet generated
Assert.Equal(0, p.GetPercentile(50));
time.Increment(6000);
// still only 1 bucket until we touch it again
Assert.Equal(1, p.GetBuckets().Count());
// a bucket has been created so we have a new percentile
Assert.Equal(1500, p.GetPercentile(50));
// let 1 minute pass
time.Increment(60000);
// no data in a minute should mean all buckets are empty (or reset) so we should not have any percentiles
Assert.Equal(0, p.GetPercentile(50));
}