/// <inheritdoc />
public IReservoirSnapshot GetSnapshot()
{
return(new WavefrontHistogramSnapshot(
wavefrontHistogram.GetSnapshot(),
WavefrontHistogramImpl.Serialize(wavefrontHistogram.FlushDistributions())
));
}
public void TestFlushDistributions()
{
var currentTime = DateTime.UtcNow;
long clockMillis() => DateTimeUtils.UnixTimeMilliseconds(currentTime);
var wavefrontHistogram = CreatePowHistogram(clockMillis);
long minute0ClockMillis = clockMillis() / 60000 * 60000;
// Test that nothing in the current minute bin gets flushed
var distributions = wavefrontHistogram.FlushDistributions();
Assert.Equal(0, distributions.Count);
// Test that prior minute bins get flushed
currentTime = currentTime.AddMinutes(1);
long minute1ClockMillis = clockMillis() / 60000 * 60000;
wavefrontHistogram.Update(0.01);
currentTime = currentTime.AddMinutes(1);
distributions = wavefrontHistogram.FlushDistributions();
var actualDict = DistributionsToDictionary(distributions);
var expectedDict = new Dictionary <long, Dictionary <double, int> > {
{ minute0ClockMillis, new Dictionary <double, int> {
{ 0.1, 1 }, { 1, 1 }, { 10, 2 }, { 100, 1 }, { 1000, 1 }, { 10000, 2 }, { 100000, 1 }
} },
{ minute1ClockMillis, new Dictionary <double, int> {
{ 0.01, 1 }
} }
};
Assert.Equal(expectedDict, actualDict);
// Test serialization
var serializedPair = WavefrontHistogramImpl.Serialize(distributions);
string expectedTimestamps = distributions
.Select(distribution => distribution.Timestamp.ToString())
.Aggregate((result, item) => result + ';' + item);
string expectedCentroids = distributions
.Select(distribution => distribution.Centroids
.Select(centroid => centroid.Key.ToString() + ' ' + centroid.Value)
.Aggregate((result, item) => result + ',' + item))
.Aggregate((result, item) => result + ';' + item);
Assert.Equal(expectedTimestamps, serializedPair.Key);
Assert.Equal(expectedCentroids, serializedPair.Value);
// Test deserialization
var deserializedDistributions = WavefrontHistogramImpl.Deserialize(serializedPair);
Assert.Equal(actualDict, DistributionsToDictionary(deserializedDistributions));
// Test that prior minute bins get cleared
distributions = wavefrontHistogram.FlushDistributions();
Assert.Equal(0, distributions.Count);
}
