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/*
* =========================================================================================
* Copyright © 2013-2015 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.system.sigar
import java.util.concurrent.atomic.AtomicLong
import kamon.metric.instrument.{ CollectionContext, Histogram }
/**
* Wrapper Histogram for cases in which the recorded values should always be the difference
* between the current value and the last recorded value. This is not thread-safe and only
* to be used with Sigar-based metrics that are securely updated within an actor.
*/
class DiffRecordingHistogram(wrappedHistogram: Histogram) extends Histogram {
@volatile private var _recordedAtLeastOnce = false
private val _lastObservedValue = new AtomicLong(0)
private def processRecording(value: Long, count: Long): Unit = {
if (_recordedAtLeastOnce) {
val diff = value - _lastObservedValue.getAndSet(value)
val current = if (diff >= 0) diff else 0L
wrappedHistogram.record(current, count)
} else {
_lastObservedValue.set(value)
_recordedAtLeastOnce = true
}
}
def record(value: Long): Unit =
processRecording(value, 1)
def record(value: Long, count: Long): Unit =
processRecording(value, count)
def cleanup: Unit =
wrappedHistogram.cleanup
def collect(context: CollectionContext): Histogram.Snapshot =
wrappedHistogram.collect(context)
}
object DiffRecordingHistogram {
def apply(histogram: Histogram): DiffRecordingHistogram =
new DiffRecordingHistogram(histogram)
}
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