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package kamon.metric.instrument
/*
* =========================================================================================
* Copyright © 2013-2014 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
import java.lang.Math.abs
import java.util.concurrent.atomic.AtomicReference
import akka.actor.Cancellable
import kamon.jsr166.LongMaxUpdater
import kamon.metric.instrument.Histogram.DynamicRange
import kamon.util.PaddedAtomicLong
import scala.concurrent.duration.FiniteDuration
trait MinMaxCounter extends Instrument {
override type SnapshotType = Histogram.Snapshot
def increment(): Unit
def increment(times: Long): Unit
def decrement()
def decrement(times: Long)
def refreshValues(): Unit
}
object MinMaxCounter {
def apply(dynamicRange: DynamicRange, refreshInterval: FiniteDuration, scheduler: RefreshScheduler): MinMaxCounter = {
val underlyingHistogram = Histogram(dynamicRange)
val minMaxCounter = new PaddedMinMaxCounter(underlyingHistogram)
val refreshValuesSchedule = scheduler.schedule(refreshInterval, () ⇒ {
minMaxCounter.refreshValues()
})
minMaxCounter.refreshValuesSchedule.set(refreshValuesSchedule)
minMaxCounter
}
def create(dynamicRange: DynamicRange, refreshInterval: FiniteDuration, scheduler: RefreshScheduler): MinMaxCounter =
apply(dynamicRange, refreshInterval, scheduler)
}
class PaddedMinMaxCounter(underlyingHistogram: Histogram) extends MinMaxCounter {
private val min = new LongMaxUpdater(0L)
private val max = new LongMaxUpdater(0L)
private val sum = new PaddedAtomicLong
val refreshValuesSchedule = new AtomicReference[Cancellable]()
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 collect(context: CollectionContext): Histogram.Snapshot = {
refreshValues()
underlyingHistogram.collect(context)
}
def cleanup: Unit = {
if (refreshValuesSchedule.get() != null)
refreshValuesSchedule.get().cancel()
}
def refreshValues(): 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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