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/* =========================================================================================
* Copyright © 2013-2017 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.
* =========================================================================================
*/
package kamon.metric
import java.lang.Math.abs
import java.time.Duration
import java.util.concurrent.atomic.AtomicLong
trait MinMaxCounter {
def unit: MeasurementUnit
def dynamicRange: DynamicRange
def sampleInterval: Duration
def increment(): Unit
def increment(times: Long): Unit
def decrement(): Unit
def decrement(times: Long): Unit
def sample(): Unit
}
class SimpleMinMaxCounter(name: String, tags: Map[String, String], underlyingHistogram: AtomicHdrHistogram,
val sampleInterval: Duration) extends MinMaxCounter {
private val min = AtomicLongMaxUpdater()
private val max = AtomicLongMaxUpdater()
private val sum = new AtomicLong()
def dynamicRange: DynamicRange =
underlyingHistogram.dynamicRange
def unit: MeasurementUnit =
underlyingHistogram.unit
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)
}
private[kamon] def snapshot(resetState: Boolean = true): MetricDistribution = {
sample()
underlyingHistogram.snapshot(resetState)
}
}
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