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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 scala.collection.concurrent.TrieMap
import akka.actor._
import com.typesafe.config.Config
import kamon.util.{ Contexts, GlobPathFilter }
import kamon.Kamon
import akka.actor
import kamon.metrics.Metrics.MetricGroupFilter
import kamon.metrics.Subscriptions.Subscribe
class MetricsExtension(system: ExtendedActorSystem) extends Kamon.Extension {
val config = system.settings.config
val storage = TrieMap[MetricGroupIdentity, MetricGroupRecorder]()
val filters = loadFilters(config)
lazy val subscriptions = system.actorOf(Props[Subscriptions], "kamon-metrics-subscriptions")
def register(identity: MetricGroupIdentity, factory: MetricGroupFactory): Option[factory.GroupRecorder] = {
if (shouldTrack(identity))
Some(storage.getOrElseUpdate(identity, factory.create(config)).asInstanceOf[factory.GroupRecorder])
else
None
}
def unregister(identity: MetricGroupIdentity): Unit = {
storage.remove(identity)
}
def subscribe[C <: MetricGroupCategory](category: C, selection: String, receiver: ActorRef, permanently: Boolean = false): Unit = {
subscriptions.tell(Subscribe(category, selection, permanently), receiver)
}
def collect: Map[MetricGroupIdentity, MetricGroupSnapshot] = {
(for ((identity, recorder) ← storage) yield (identity, recorder.collect)).toMap
}
private def shouldTrack(identity: MetricGroupIdentity): Boolean = {
filters.get(identity.category.name).map(filter ⇒ filter.accept(identity.name)).getOrElse(false)
}
def loadFilters(config: Config): Map[String, MetricGroupFilter] = {
import scala.collection.JavaConverters._
val filters = config.getObjectList("kamon.metrics.filters").asScala
val allFilters =
for (
filter ← filters;
entry ← filter.entrySet().asScala
) yield {
val key = entry.getKey
val keyBasedConfig = entry.getValue.atKey(key)
val includes = keyBasedConfig.getStringList(s"$key.includes").asScala.map(inc ⇒ new GlobPathFilter(inc)).toList
val excludes = keyBasedConfig.getStringList(s"$key.excludes").asScala.map(exc ⇒ new GlobPathFilter(exc)).toList
(key, MetricGroupFilter(includes, excludes))
}
allFilters.toMap
}
val defaultDispatcher = Contexts.lookupExecutionContext(Contexts.kamonDefaultDispatcher)(system)
}
object Metrics extends ExtensionId[MetricsExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = Metrics
def createExtension(system: ExtendedActorSystem): MetricsExtension = new MetricsExtension(system)
case class MetricGroupFilter(includes: List[GlobPathFilter], excludes: List[GlobPathFilter]) {
def accept(name: String): Boolean = includes.exists(_.accept(name)) && !excludes.exists(_.accept(name))
}
}
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