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package kamon.metric.instrument
import java.lang.Math.abs
import java.time.Duration
import java.util.concurrent.atomic.{AtomicLong, AtomicReference}
import kamon.jsr166.LongMaxUpdater
import kamon.util.MeasurementUnit
trait MinMaxCounter {
def dynamicRange: DynamicRange
def sampleInterval: Duration
def measurementUnit: MeasurementUnit
def increment(): Unit
def increment(times: Long): Unit
def decrement(): Unit
def decrement(times: Long): Unit
def sample(): Unit
}
class PaddedMinMaxCounter(name: String, tags: Map[String, String], underlyingHistogram: Histogram with DistributionSnapshotInstrument,
val sampleInterval: Duration) extends SnapshotableMinMaxCounter {
private val min = new LongMaxUpdater(0L)
private val max = new LongMaxUpdater(0L)
private val sum = new AtomicLong()
def dynamicRange: DynamicRange =
underlyingHistogram.dynamicRange
def measurementUnit: MeasurementUnit =
underlyingHistogram.measurementUnit
private[kamon] def snapshot(): DistributionSnapshot =
underlyingHistogram.snapshot()
def increment(): Unit =
increment(1L)
def increment(times: Long): Unit = {
val currentValue = sum.addAndGet(times)
max.update(currentValue)
}
def decrement(): Unit =
decrement(1L)
def decrement(times: Long): Unit = {
val currentValue = sum.addAndGet(-times)
min.update(-currentValue)
}
def sample(): Unit = {
val currentValue = {
val value = sum.get()
if (value <= 0) 0 else value
}
val currentMin = {
val rawMin = min.maxThenReset(-currentValue)
if (rawMin >= 0)
0
else
abs(rawMin)
}
val currentMax = max.maxThenReset(currentValue)
underlyingHistogram.record(currentValue)
underlyingHistogram.record(currentMin)
underlyingHistogram.record(currentMax)
}
}
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