public override void Snapshot(MetricsRecordBuilder builder, bool all)
{
lock (this)
{
if (all || Changed())
{
numSamples += intervalStat.NumSamples();
builder.AddCounter(numInfo, numSamples).AddGauge(avgInfo, LastStat().Mean());
if (extended)
{
builder.AddGauge(stdevInfo, LastStat().Stddev()).AddGauge(iMinInfo, LastStat().Min
()).AddGauge(iMaxInfo, LastStat().Max()).AddGauge(minInfo, minMax.Min()).AddGauge
(maxInfo, minMax.Max());
}
if (Changed())
{
if (numSamples > 0)
{
intervalStat.CopyTo(prevStat);
intervalStat.Reset();
}
ClearChanged();
}
}
}
}
public virtual void TestSimple()
{
SampleStat stat = new SampleStat();
Assert.Equal("num samples", 0, stat.NumSamples());
Assert.Equal("mean", 0.0, stat.Mean(), Epsilon);
Assert.Equal("variance", 0.0, stat.Variance(), Epsilon);
Assert.Equal("stddev", 0.0, stat.Stddev(), Epsilon);
Assert.Equal("min", SampleStat.MinMax.DefaultMinValue, stat.Min
(), Epsilon);
Assert.Equal("max", SampleStat.MinMax.DefaultMaxValue, stat.Max
(), Epsilon);
stat.Add(3);
Assert.Equal("num samples", 1L, stat.NumSamples());
Assert.Equal("mean", 3.0, stat.Mean(), Epsilon);
Assert.Equal("variance", 0.0, stat.Variance(), Epsilon);
Assert.Equal("stddev", 0.0, stat.Stddev(), Epsilon);
Assert.Equal("min", 3.0, stat.Min(), Epsilon);
Assert.Equal("max", 3.0, stat.Max(), Epsilon);
stat.Add(2).Add(1);
Assert.Equal("num samples", 3L, stat.NumSamples());
Assert.Equal("mean", 2.0, stat.Mean(), Epsilon);
Assert.Equal("variance", 1.0, stat.Variance(), Epsilon);
Assert.Equal("stddev", 1.0, stat.Stddev(), Epsilon);
Assert.Equal("min", 1.0, stat.Min(), Epsilon);
Assert.Equal("max", 3.0, stat.Max(), Epsilon);
stat.Reset();
Assert.Equal("num samples", 0, stat.NumSamples());
Assert.Equal("mean", 0.0, stat.Mean(), Epsilon);
Assert.Equal("variance", 0.0, stat.Variance(), Epsilon);
Assert.Equal("stddev", 0.0, stat.Stddev(), Epsilon);
Assert.Equal("min", SampleStat.MinMax.DefaultMinValue, stat.Min
(), Epsilon);
Assert.Equal("max", SampleStat.MinMax.DefaultMaxValue, stat.Max
(), Epsilon);
}