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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.metric
import akka.actor.{ Actor, ActorRef, Props }
import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
import kamon.metric.instrument._
/**
* Can be used as a decorator to scale TickMetricSnapshot messages to given `timeUnits` and/or `memoryUnits`
* before forwarding to original receiver
* @param timeUnits Optional time units to scale time metrics to
* @param memoryUnits Optional memory units to scale memory metrics to
* @param receiver Receiver of scaled metrics snapshot, usually a backend sender
*/
class MetricScaleDecorator(timeUnits: Option[Time], memoryUnits: Option[Memory], receiver: ActorRef) extends Actor {
require(timeUnits.isDefined || memoryUnits.isDefined,
"Use MetricScaleDecorator only when any of units is defined")
override def receive: Receive = {
case tick: TickMetricSnapshot ⇒
val scaled = tick.copy(metrics = tick.metrics.mapValues { entitySnapshot ⇒
new DefaultEntitySnapshot(entitySnapshot.metrics.map {
case (metricKey, metricSnapshot) ⇒
val scaledSnapshot = (metricKey.unitOfMeasurement, timeUnits, memoryUnits) match {
case (time: Time, Some(to), _) ⇒ metricSnapshot.scale(time, to)
case (memory: Memory, _, Some(to)) ⇒ metricSnapshot.scale(memory, to)
case _ ⇒ metricSnapshot
}
metricKey -> scaledSnapshot
})
})
receiver forward scaled
}
}
object MetricScaleDecorator {
def props(timeUnits: Option[Time], memoryUnits: Option[Memory], receiver: ActorRef): Props =
Props(new MetricScaleDecorator(timeUnits, memoryUnits, receiver))
}
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