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/*
* =========================================================================================
* Copyright © 2013 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.metrics
import akka.actor.{Props, ActorRef, Actor}
import kamon.metrics.Subscriptions.TickMetricSnapshot
import kamon.metrics.TickMetricSnapshotBuffer.FlushBuffer
import scala.concurrent.duration.FiniteDuration
class TickMetricSnapshotBuffer(flushInterval: FiniteDuration, receiver: ActorRef) extends Actor {
val flushSchedule = context.system.scheduler.schedule(flushInterval, flushInterval, self, FlushBuffer)(context.dispatcher)
def receive = empty
def empty: Actor.Receive = {
case tick : TickMetricSnapshot => context become(buffering(tick))
case FlushBuffer => // Nothing to flush.
}
def buffering(buffered: TickMetricSnapshot): Actor.Receive = {
case TickMetricSnapshot(_, to, tickMetrics) =>
val combinedMetrics = combineMaps(buffered.metrics, tickMetrics)(mergeMetricGroup)
val combinedSnapshot = TickMetricSnapshot(buffered.from, to, combinedMetrics)
context become(buffering(combinedSnapshot))
case FlushBuffer =>
receiver ! buffered
context become(empty)
}
override def postStop(): Unit = {
flushSchedule.cancel()
super.postStop()
}
def mergeMetricGroup(left: MetricGroupSnapshot, right: MetricGroupSnapshot) = new MetricGroupSnapshot {
val metrics = combineMaps(left.metrics, right.metrics)((l, r) => l.merge(r))
}
}
object TickMetricSnapshotBuffer {
case object FlushBuffer
def props(flushInterval: FiniteDuration, receiver: ActorRef): Props =
Props[TickMetricSnapshotBuffer](new TickMetricSnapshotBuffer(flushInterval, receiver))
}
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