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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.GlobPathFilter
import kamon.Kamon
import akka.actor
import kamon.metrics.Metrics.MetricGroupFilter
import kamon.metrics.MetricGroupIdentity.Category
import kamon.metrics.Metrics.MetricGroupFilter
import scala.Some
import kamon.metrics.Subscriptions.Subscribe
case class MetricGroupIdentity(name: String, category: MetricGroupIdentity.Category)
trait MetricIdentity {
def name: String
}
trait MetricGroupRecorder {
def record(identity: MetricIdentity, value: Long)
def collect: MetricGroupSnapshot
}
trait MetricGroupSnapshot {
def metrics: Map[MetricIdentity, MetricSnapshot]
}
trait MetricRecorder {
def record(value: Long)
def collect(): MetricSnapshot
}
trait MetricSnapshot {
def numberOfMeasurements: Long
def measurementLevels: Vector[MetricSnapshot.Measurement]
}
object MetricSnapshot {
case class Measurement(value: Long, count: Long)
}
case class DefaultMetricSnapshot(numberOfMeasurements: Long, measurementLevels: Vector[MetricSnapshot.Measurement]) extends MetricSnapshot
object MetricGroupIdentity {
trait Category {
def name: String
}
val AnyCategory = new Category {
def name: String = "match-all"
override def equals(that: Any): Boolean = that.isInstanceOf[Category]
}
}
trait MetricGroupFactory {
type Group <: MetricGroupRecorder
def create(config: Config): Group
}
class MetricsExtension(val 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(name: String, category: MetricGroupIdentity.Category with MetricGroupFactory): Option[category.Group] = {
if (shouldTrack(name, category))
Some(storage.getOrElseUpdate(MetricGroupIdentity(name, category), category.create(config)).asInstanceOf[category.Group])
else
None
}
def unregister(name: String, category: MetricGroupIdentity.Category with MetricGroupFactory): Unit = {
storage.remove(MetricGroupIdentity(name, category))
}
def subscribe(category: Category, 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(name: String, category: MetricGroupIdentity.Category): Boolean = {
filters.get(category.name).map(filter ⇒ filter.accept(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
}
}
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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