diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metrics/instruments/MinMaxCounter.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metrics/instruments/MinMaxCounter.scala | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metrics/instruments/MinMaxCounter.scala b/kamon-core/src/main/scala/kamon/metrics/instruments/MinMaxCounter.scala new file mode 100644 index 00000000..ba2550af --- /dev/null +++ b/kamon-core/src/main/scala/kamon/metrics/instruments/MinMaxCounter.scala @@ -0,0 +1,58 @@ +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 = { + val value = sum.get() + if (value < 0) 0 else value + } + 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) +} |