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package kamon.metric
import kamon.util.MeasurementUnit
import kamon.util.MeasurementUnit.Dimension
class Scaler(targetTimeUnit: MeasurementUnit, targetInformationUnit: MeasurementUnit, dynamicRange: DynamicRange) {
require(targetTimeUnit.dimension == Dimension.Time, "timeUnit must be in the time dimension.")
require(targetInformationUnit.dimension == Dimension.Information, "informationUnit must be in the information dimension.")
val scaleHistogram = new HdrHistogram("scaler", Map.empty, MeasurementUnit.none, dynamicRange)
def scaleDistribution(metric: MetricDistribution): MetricDistribution = {
metric.measurementUnit match {
case MeasurementUnit(Dimension.Time, magnitude) if(magnitude != targetTimeUnit.magnitude) =>
scaleMetricDistributionToTarget(metric, targetTimeUnit)
case MeasurementUnit(Dimension.Information, magnitude) if(magnitude != targetTimeUnit.magnitude) =>
scaleMetricDistributionToTarget(metric, targetInformationUnit)
case _ => metric
}
}
def scaleMetricValue(metric: MetricValue): MetricValue = {
metric.measurementUnit match {
case MeasurementUnit(Dimension.Time, magnitude) if(magnitude != targetTimeUnit.magnitude) =>
scaleMetricValueToTarget(metric, targetTimeUnit)
case MeasurementUnit(Dimension.Information, magnitude) if(magnitude != targetTimeUnit.magnitude) =>
scaleMetricValueToTarget(metric, targetInformationUnit)
case _ => metric
}
}
private def scaleMetricDistributionToTarget(metric: MetricDistribution, targetUnit: MeasurementUnit): MetricDistribution = {
metric.distribution.bucketsIterator.foreach(b => {
val scaledValue = MeasurementUnit.scale(b.value, metric.measurementUnit, targetUnit)
scaleHistogram.record(Math.ceil(scaledValue).toLong, b.frequency)
})
scaleHistogram.snapshot().copy(
name = metric.name,
tags = metric.tags,
measurementUnit = targetUnit,
dynamicRange = dynamicRange
)
}
private def scaleMetricValueToTarget(metric: MetricValue, targetUnit: MeasurementUnit): MetricValue = {
val scaledValue = MeasurementUnit.scale(metric.value, metric.measurementUnit, targetUnit)
metric.copy(
value = Math.ceil(scaledValue).toLong,
measurementUnit = targetUnit
)
}
}
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