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package kamon.metric
import akka.actor.{ Props, Actor, ActorRef }
import kamon.Kamon
import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
import kamon.metric.TickMetricSnapshotBuffer.FlushBuffer
import kamon.metric.instrument.CollectionContext
import kamon.util.MapMerge
import scala.concurrent.duration.FiniteDuration
class TickMetricSnapshotBuffer(flushInterval: FiniteDuration, receiver: ActorRef) extends Actor {
import MapMerge.Syntax
val flushSchedule = context.system.scheduler.schedule(flushInterval, flushInterval, self, FlushBuffer)(context.dispatcher)
val collectionContext: CollectionContext = Kamon(Metrics)(context.system).buildDefaultCollectionContext
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 = buffered.metrics.merge(tickMetrics, (l, r) ⇒ l.merge(r, collectionContext))
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()
}
}
object TickMetricSnapshotBuffer {
case object FlushBuffer
def props(flushInterval: FiniteDuration, receiver: ActorRef): Props =
Props[TickMetricSnapshotBuffer](new TickMetricSnapshotBuffer(flushInterval, receiver))
}
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