/// <inheritdoc />
public IReservoirSnapshot GetSnapshot()
{
return(new WavefrontHistogramSnapshot(
wavefrontHistogram.GetSnapshot(),
WavefrontHistogramImpl.Serialize(wavefrontHistogram.FlushDistributions())
));
}
public void TestSnapshot()
{
var currentTime = DateTime.UtcNow;
long clockMillis() => DateTimeUtils.UnixTimeMilliseconds(currentTime);
var powHistogram = CreatePowHistogram(clockMillis);
var rangeHistogram = CreateRangeHistogram(clockMillis);
var multiThreadedHistogram = CreateMultiThreadedHistogram(clockMillis);
var emptyHistogram = new WavefrontHistogramImpl(clockMillis);
currentTime = currentTime.AddMinutes(1);
var powSnapshot = powHistogram.GetSnapshot();
var rangeSnapshot = rangeHistogram.GetSnapshot();
var multiThreadedSnapshot = multiThreadedHistogram.GetSnapshot();
var emptySnapshot = emptyHistogram.GetSnapshot();
// Test snapshot for the pow histogram
Assert.Equal(9, powSnapshot.Count);
Assert.Equal(100000, powSnapshot.Max);
Assert.Equal(13457.9, powSnapshot.Mean, 1);
Assert.Equal(0.1, powSnapshot.Min);
Assert.Equal(7, powSnapshot.Size);
Assert.Equal(121121.1, powSnapshot.Sum);
Assert.Equal(
PowDict.SelectMany(entry => Enumerable.Repeat(entry.Key, entry.Value)),
powSnapshot.Values
);
Assert.Equal(100, powSnapshot.GetValue(0.5d));
// Test snapshot for the range histogram
Assert.Equal(1000, rangeSnapshot.Count);
Assert.Equal(1000, rangeSnapshot.Max);
Assert.Equal(500.5, rangeSnapshot.Mean);
Assert.Equal(1, rangeSnapshot.Min);
Assert.Equal(288.6749902572095, rangeSnapshot.StdDev, 0);
Assert.Equal(500500, rangeSnapshot.Sum);
Assert.InRange(rangeSnapshot.GetValue(0.5d), 490.5, 510.5);
Assert.InRange(rangeSnapshot.GetValue(0.75d), 745.5, 755.5);
Assert.InRange(rangeSnapshot.GetValue(0.95d), 949, 952);
Assert.InRange(rangeSnapshot.GetValue(0.98d), 980, 981);
Assert.InRange(rangeSnapshot.GetValue(0.99d), 990, 991);
Assert.InRange(rangeSnapshot.GetValue(0.999d), 999, 1000);
// Test snapshot for multi-threaded histogram
Assert.Equal(100, multiThreadedSnapshot.Count);
Assert.Equal(28.86607004772212, multiThreadedSnapshot.StdDev, 0);
Assert.Equal(5050, multiThreadedSnapshot.Sum);
Assert.Equal(100, multiThreadedSnapshot.GetValue(0.999d), 1);
// Test snapshot for empty histogram
Assert.Equal(0, emptySnapshot.StdDev);
}
