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package kamon.metrics.instruments
/*
* =========================================================================================
* 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._
import jsr166e.LongMaxUpdater
import kamon.util.PaddedAtomicLong
import kamon.metrics.instruments.MinMaxCounter.CounterMeasurement
class MinMaxCounter {
private val min = new LongMaxUpdater
private val max = new LongMaxUpdater
private val sum = new PaddedAtomicLong
min.update(0L)
max.update(0L)
def increment(value: Long = 1L): Unit = {
val currentValue = sum.addAndGet(value)
max.update(currentValue)
}
def decrement(value: Long = 1L): Unit = {
val currentValue = sum.addAndGet(-value)
min.update(-currentValue)
}
def collect(): CounterMeasurement = {
val currentValue = sum.get()
val result = CounterMeasurement(abs(min.maxThenReset()), max.maxThenReset(), currentValue)
max.update(currentValue)
min.update(-currentValue)
result
}
}
object MinMaxCounter {
def apply() = new MinMaxCounter()
case class CounterMeasurement(min: Long, max: Long, current: Long)
}
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