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author | Ivan Topolnjak <ivantopo@gmail.com> | 2015-01-12 01:45:27 +0100 |
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committer | Ivan Topolnjak <ivantopo@gmail.com> | 2015-01-24 23:19:01 +0100 |
commit | 485abe569d23bccf2d263c82b43e59464dc7e834 (patch) | |
tree | 34dd5129afe4c4705ce80830caf8d5e48212ce39 /kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala | |
parent | 61089a75240f5cc21b056087f1d633dd31981c61 (diff) | |
download | Kamon-485abe569d23bccf2d263c82b43e59464dc7e834.tar.gz Kamon-485abe569d23bccf2d263c82b43e59464dc7e834.tar.bz2 Kamon-485abe569d23bccf2d263c82b43e59464dc7e834.zip |
! all: improve the metric recorders infrastructure
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala b/kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala new file mode 100644 index 00000000..f616be35 --- /dev/null +++ b/kamon-core/src/main/scala/kamon/metric/SubscriptionsDispatcher.scala @@ -0,0 +1,115 @@ +/* + * ========================================================================================= + * 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.metric + +import akka.actor._ +import kamon.metric.SubscriptionsDispatcher._ +import kamon.util.{ MilliTimestamp, GlobPathFilter } +import scala.concurrent.duration.FiniteDuration + +/** + * Manages subscriptions to metrics and dispatch snapshots on every tick to all subscribers. + */ +private[kamon] class SubscriptionsDispatcher(interval: FiniteDuration, collector: () ⇒ Map[Entity, EntitySnapshot]) extends Actor { + var lastTick = MilliTimestamp.now + var oneShotSubscriptions = Map.empty[ActorRef, SubscriptionFilter] + var permanentSubscriptions = Map.empty[ActorRef, SubscriptionFilter] + val tickSchedule = context.system.scheduler.schedule(interval, interval, self, Tick)(context.dispatcher) + + def receive = { + case Tick ⇒ processTick() + case Subscribe(filter, subscriber, permanently) ⇒ subscribe(filter, subscriber, permanently) + case Unsubscribe(subscriber) ⇒ unsubscribe(subscriber) + case Terminated(subscriber) ⇒ unsubscribe(subscriber) + } + + def processTick(): Unit = + dispatch(collector()) + + def subscribe(filter: SubscriptionFilter, subscriber: ActorRef, permanent: Boolean): Unit = { + def addSubscription(storage: Map[ActorRef, SubscriptionFilter]): Map[ActorRef, SubscriptionFilter] = + storage.updated(subscriber, storage.getOrElse(subscriber, SubscriptionFilter.Empty).combine(filter)) + + context.watch(subscriber) + + if (permanent) + permanentSubscriptions = addSubscription(permanentSubscriptions) + else + oneShotSubscriptions = addSubscription(oneShotSubscriptions) + } + + def unsubscribe(subscriber: ActorRef): Unit = { + permanentSubscriptions = permanentSubscriptions - subscriber + oneShotSubscriptions = oneShotSubscriptions - subscriber + } + + def dispatch(snapshots: Map[Entity, EntitySnapshot]): Unit = { + val currentTick = MilliTimestamp.now + + dispatchSelections(lastTick, currentTick, permanentSubscriptions, snapshots) + dispatchSelections(lastTick, currentTick, oneShotSubscriptions, snapshots) + + lastTick = currentTick + oneShotSubscriptions = Map.empty[ActorRef, SubscriptionFilter] + } + + def dispatchSelections(lastTick: MilliTimestamp, currentTick: MilliTimestamp, subscriptions: Map[ActorRef, SubscriptionFilter], + snapshots: Map[Entity, EntitySnapshot]): Unit = { + + for ((subscriber, filter) ← subscriptions) { + val selection = snapshots.filter(group ⇒ filter.accept(group._1)) + val tickMetrics = TickMetricSnapshot(lastTick, currentTick, selection) + + subscriber ! tickMetrics + } + } +} + +object SubscriptionsDispatcher { + def props(interval: FiniteDuration, collector: () ⇒ Map[Entity, EntitySnapshot]): Props = + Props(new SubscriptionsDispatcher(interval, collector)) + + case object Tick + case class Unsubscribe(subscriber: ActorRef) + case class Subscribe(filter: SubscriptionFilter, subscriber: ActorRef, permanently: Boolean = false) + case class TickMetricSnapshot(from: MilliTimestamp, to: MilliTimestamp, metrics: Map[Entity, EntitySnapshot]) + +} + +trait SubscriptionFilter { self ⇒ + + def accept(entity: Entity): Boolean + + final def combine(that: SubscriptionFilter): SubscriptionFilter = new SubscriptionFilter { + override def accept(entity: Entity): Boolean = self.accept(entity) || that.accept(entity) + } +} + +object SubscriptionFilter { + val Empty = new SubscriptionFilter { + def accept(entity: Entity): Boolean = false + } + + def apply(category: String, name: String): SubscriptionFilter = new SubscriptionFilter { + val categoryPattern = new GlobPathFilter(category) + val namePattern = new GlobPathFilter(name) + + def accept(entity: Entity): Boolean = { + categoryPattern.accept(entity.category) && namePattern.accept(entity.name) + } + } +}
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