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diff --git a/kamon-system-metrics/src/main/scala/kamon/metrics/LoadAverageMetrics.scala b/kamon-system-metrics/src/main/scala/kamon/metrics/LoadAverageMetrics.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013-2014 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 akka.actor.ActorSystem
+import com.typesafe.config.Config
+import kamon.metric._
+import kamon.metric.instrument.Histogram
+
+case class LoadAverageMetrics(name: String) extends MetricGroupIdentity {
+ val category = LoadAverageMetrics
+}
+
+object LoadAverageMetrics extends MetricGroupCategory {
+ val name = "load-average"
+
+ case object OneMinute extends MetricIdentity { val name = "last-minute" }
+ case object FiveMinutes extends MetricIdentity { val name = "last-five-minutes" }
+ case object FifteenMinutes extends MetricIdentity { val name = "last-fifteen-minutes" }
+
+ case class LoadAverageMetricsRecorder(one: Histogram, five: Histogram, fifteen: Histogram)
+ extends MetricGroupRecorder {
+
+ def collect(context: CollectionContext): MetricGroupSnapshot = {
+ LoadAverageMetricsSnapshot(one.collect(context), five.collect(context), fifteen.collect(context))
+ }
+
+ def cleanup: Unit = {}
+ }
+
+ case class LoadAverageMetricsSnapshot(one: Histogram.Snapshot, five: Histogram.Snapshot, fifteen: Histogram.Snapshot)
+ extends MetricGroupSnapshot {
+
+ type GroupSnapshotType = LoadAverageMetricsSnapshot
+
+ def merge(that: GroupSnapshotType, context: CollectionContext): GroupSnapshotType = {
+ LoadAverageMetricsSnapshot(one.merge(that.one, context), five.merge(that.five, context), fifteen.merge(that.fifteen, context))
+ }
+
+ lazy val metrics: Map[MetricIdentity, MetricSnapshot] = Map(
+ OneMinute -> one,
+ FiveMinutes -> five,
+ FifteenMinutes -> fifteen)
+ }
+
+ val Factory = LoadAverageMetricGroupFactory
+}
+
+case object LoadAverageMetricGroupFactory extends MetricGroupFactory {
+
+ import LoadAverageMetrics._
+
+ type GroupRecorder = LoadAverageMetricsRecorder
+
+ def create(config: Config, system: ActorSystem): GroupRecorder = {
+ val settings = config.getConfig("precision.system.load-average")
+
+ val oneMinuteConfig = settings.getConfig("one")
+ val fiveMinutesConfig = settings.getConfig("five")
+ val fifteenMinutesConfig = settings.getConfig("fifteen")
+
+ new LoadAverageMetricsRecorder(
+ Histogram.fromConfig(oneMinuteConfig),
+ Histogram.fromConfig(fiveMinutesConfig),
+ Histogram.fromConfig(fifteenMinutesConfig))
+ }
+}