public MetricTelemetry GetValueAndReset()
{
long curValue = Interlocked.Exchange(ref this.compositeValue, 0);
int curMinValue = this.minValue;
int curMaxValue = this.maxValue;
minValue = Int32.MaxValue;
maxValue = Int32.MinValue;
var count = (int)(curValue & ((1 << 24) - 1));
double value = curValue >> 24;
var metric = this.GetInitializedMetricTelemetry();
if (count != 0)
{
metric.Value = value / count;
metric.Count = count;
if (this.shouldCalculateMinMax)
{
metric.Min = curMinValue;
metric.Max = curMaxValue;
}
else if (this.shouldCalculatePercentiles)
{
List <double> curListValues = Interlocked.Exchange(ref this.listValues, new List <double>());
PercentileAggregations percentiles = CalculatePercentiles(curListValues);
metric.Properties.Add(Constants.P50Name, percentiles.P50.ToString(CultureInfo.InvariantCulture));
metric.Properties.Add(Constants.P75Name, percentiles.P75.ToString(CultureInfo.InvariantCulture));
metric.Properties.Add(Constants.P90Name, percentiles.P90.ToString(CultureInfo.InvariantCulture));
metric.Properties.Add(Constants.P95Name, percentiles.P95.ToString(CultureInfo.InvariantCulture));
metric.Properties.Add(Constants.P99Name, percentiles.P99.ToString(CultureInfo.InvariantCulture));
}
}
else
{
metric.Value = 0;
metric.Count = 0;
}
return(metric);
}
private PercentileAggregations CalculatePercentiles(List <double> values)
{
PercentileAggregations percentiles = new PercentileAggregations();
values.OrderBy(i => i);
int percentile50Index = GetPercentileNearestIndex(values.Count, 50);
int percentile75Index = GetPercentileNearestIndex(values.Count, 75);
int percentile90Index = GetPercentileNearestIndex(values.Count, 90);
int percentile95Index = GetPercentileNearestIndex(values.Count, 95);
int percentile99Index = GetPercentileNearestIndex(values.Count, 99);
int listValueIndex = 0;
foreach (double value in values)
{
if (listValueIndex == percentile50Index)
{
percentiles.P50 = value;
}
else if (listValueIndex == percentile75Index)
{
percentiles.P75 = value;
}
else if (listValueIndex == percentile90Index)
{
percentiles.P90 = value;
}
else if (listValueIndex == percentile95Index)
{
percentiles.P95 = value;
}
else if (listValueIndex == percentile99Index)
{
percentiles.P99 = value;
}
listValueIndex++;
}
return(percentiles);
}