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/*
* =========================================================================================
* 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.
* =========================================================================================
*/
package kamon.system
import java.lang.management.GarbageCollectorMXBean
import akka.actor.{ Actor, Props }
import kamon.metrics.GCMetrics.GCMetricRecorder
import scala.concurrent.duration.FiniteDuration
class GcMetricsCollector(collectInterval: FiniteDuration, recorder: Option[GCMetricRecorder], extractor: GcMetricExtractor) extends Actor {
import kamon.system.GcMetricsCollector._
val collectSchedule = context.system.scheduler.schedule(collectInterval, collectInterval, self, Collect)(SystemMetrics(context.system).dispatcher)
def receive: Receive = {
case Collect ⇒ collectMetrics()
}
override def postStop() = collectSchedule.cancel()
def collectMetrics(): Unit = recorder.map(recordGc)
private def recordGc(gcr: GCMetricRecorder) = {
val gcMeasure = extractor.extract()
gcr.count.record(gcMeasure.collectionCount)
gcr.time.record(gcMeasure.collectionTime)
}
}
object GcMetricsCollector {
case object Collect
def props(collectInterval: FiniteDuration, recorder: Option[GCMetricRecorder], extractor: GcMetricExtractor): Props = Props(classOf[GcMetricsCollector], collectInterval, recorder, extractor)
}
case class GcMeasure(collectionCount: Long, collectionTime: Long)
case class GcMetricExtractor(gc: GarbageCollectorMXBean) {
var previousGcCount = 0L
var previousGcTime = 0L
def extract(): GcMeasure = {
var diffCollectionCount = 0L
var diffCollectionTime = 0L
val collectionCount = gc.getCollectionCount
val collectionTime = gc.getCollectionTime
if (collectionCount > 0)
diffCollectionCount = collectionCount - previousGcCount
if (collectionTime > 0)
diffCollectionTime = collectionTime - previousGcTime
previousGcCount = collectionCount
previousGcTime = collectionTime
GcMeasure(diffCollectionCount, diffCollectionTime)
}
}
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