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package kamon.metric
import akka.actor
import akka.actor.{ ExtendedActorSystem, ExtensionIdProvider, ExtensionId }
import kamon.Kamon
import kamon.metric.instrument.{ Gauge, MinMaxCounter, Counter, Histogram }
import scala.concurrent.duration.FiniteDuration
class UserMetricsExtension(system: ExtendedActorSystem) extends Kamon.Extension {
import UserMetrics._
lazy val metricsExtension = Kamon(Metrics)(system)
val precisionConfig = system.settings.config.getConfig("kamon.metrics.precision")
val defaultHistogramPrecisionConfig = precisionConfig.getConfig("default-histogram-precision")
val defaultMinMaxCounterPrecisionConfig = precisionConfig.getConfig("default-min-max-counter-precision")
val defaultGaugePrecisionConfig = precisionConfig.getConfig("default-gauge-precision")
def registerHistogram(name: String, precision: Histogram.Precision, highestTrackableValue: Long): Histogram = {
metricsExtension.storage.getOrElseUpdate(UserHistogram(name), {
UserHistogramRecorder(Histogram(highestTrackableValue, precision, Scale.Unit))
}).asInstanceOf[UserHistogramRecorder].histogram
}
def registerHistogram(name: String): Histogram = {
metricsExtension.storage.getOrElseUpdate(UserHistogram(name), {
UserHistogramRecorder(Histogram.fromConfig(defaultHistogramPrecisionConfig))
}).asInstanceOf[UserHistogramRecorder].histogram
}
def registerCounter(name: String): Counter = {
metricsExtension.storage.getOrElseUpdate(UserCounter(name), {
UserCounterRecorder(Counter())
}).asInstanceOf[UserCounterRecorder].counter
}
def registerMinMaxCounter(name: String, precision: Histogram.Precision, highestTrackableValue: Long,
refreshInterval: FiniteDuration): MinMaxCounter = {
metricsExtension.storage.getOrElseUpdate(UserMinMaxCounter(name), {
UserMinMaxCounterRecorder(MinMaxCounter(highestTrackableValue, precision, Scale.Unit, refreshInterval, system))
}).asInstanceOf[UserMinMaxCounterRecorder].minMaxCounter
}
def registerMinMaxCounter(name: String): MinMaxCounter = {
metricsExtension.storage.getOrElseUpdate(UserMinMaxCounter(name), {
UserMinMaxCounterRecorder(MinMaxCounter.fromConfig(defaultMinMaxCounterPrecisionConfig, system))
}).asInstanceOf[UserMinMaxCounterRecorder].minMaxCounter
}
def registerGauge(name: String)(currentValueCollector: Gauge.CurrentValueCollector): Gauge = {
metricsExtension.storage.getOrElseUpdate(UserGauge(name), {
UserGaugeRecorder(Gauge.fromConfig(defaultGaugePrecisionConfig, system)(currentValueCollector))
}).asInstanceOf[UserGaugeRecorder].gauge
}
def registerGauge(name: String, precision: Histogram.Precision, highestTrackableValue: Long,
refreshInterval: FiniteDuration)(currentValueCollector: Gauge.CurrentValueCollector): Gauge = {
metricsExtension.storage.getOrElseUpdate(UserGauge(name), {
UserGaugeRecorder(Gauge(precision, highestTrackableValue, Scale.Unit, refreshInterval, system)(currentValueCollector))
}).asInstanceOf[UserGaugeRecorder].gauge
}
def removeHistogram(name: String): Unit =
metricsExtension.unregister(UserHistogram(name))
def removeCounter(name: String): Unit =
metricsExtension.unregister(UserCounter(name))
def removeMinMaxCounter(name: String): Unit =
metricsExtension.unregister(UserMinMaxCounter(name))
def removeGauge(name: String): Unit =
metricsExtension.unregister(UserGauge(name))
}
object UserMetrics extends ExtensionId[UserMetricsExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = Metrics
def createExtension(system: ExtendedActorSystem): UserMetricsExtension = new UserMetricsExtension(system)
sealed trait UserMetricGroup
//
// Histograms
//
case class UserHistogram(name: String) extends MetricGroupIdentity with UserMetricGroup {
val category = UserHistograms
}
case class UserHistogramRecorder(histogram: Histogram) extends MetricGroupRecorder {
def collect(context: CollectionContext): MetricGroupSnapshot =
UserHistogramSnapshot(histogram.collect(context))
def cleanup: Unit = histogram.cleanup
}
case class UserHistogramSnapshot(histogramSnapshot: Histogram.Snapshot) extends MetricGroupSnapshot {
type GroupSnapshotType = UserHistogramSnapshot
def merge(that: UserHistogramSnapshot, context: CollectionContext): UserHistogramSnapshot =
UserHistogramSnapshot(that.histogramSnapshot.merge(histogramSnapshot, context))
def metrics: Map[MetricIdentity, MetricSnapshot] = Map((RecordedValues, histogramSnapshot))
}
//
// Counters
//
case class UserCounter(name: String) extends MetricGroupIdentity with UserMetricGroup {
val category = UserCounters
}
case class UserCounterRecorder(counter: Counter) extends MetricGroupRecorder {
def collect(context: CollectionContext): MetricGroupSnapshot =
UserCounterSnapshot(counter.collect(context))
def cleanup: Unit = counter.cleanup
}
case class UserCounterSnapshot(counterSnapshot: Counter.Snapshot) extends MetricGroupSnapshot {
type GroupSnapshotType = UserCounterSnapshot
def merge(that: UserCounterSnapshot, context: CollectionContext): UserCounterSnapshot =
UserCounterSnapshot(that.counterSnapshot.merge(counterSnapshot, context))
def metrics: Map[MetricIdentity, MetricSnapshot] = Map((Count, counterSnapshot))
}
//
// MinMaxCounters
//
case class UserMinMaxCounter(name: String) extends MetricGroupIdentity with UserMetricGroup {
val category = UserMinMaxCounters
}
case class UserMinMaxCounterRecorder(minMaxCounter: MinMaxCounter) extends MetricGroupRecorder {
def collect(context: CollectionContext): MetricGroupSnapshot =
UserMinMaxCounterSnapshot(minMaxCounter.collect(context))
def cleanup: Unit = minMaxCounter.cleanup
}
case class UserMinMaxCounterSnapshot(minMaxCounterSnapshot: Histogram.Snapshot) extends MetricGroupSnapshot {
type GroupSnapshotType = UserMinMaxCounterSnapshot
def merge(that: UserMinMaxCounterSnapshot, context: CollectionContext): UserMinMaxCounterSnapshot =
UserMinMaxCounterSnapshot(that.minMaxCounterSnapshot.merge(minMaxCounterSnapshot, context))
def metrics: Map[MetricIdentity, MetricSnapshot] = Map((RecordedValues, minMaxCounterSnapshot))
}
//
// Gauges
//
case class UserGauge(name: String) extends MetricGroupIdentity with UserMetricGroup {
val category = UserGauges
}
case class UserGaugeRecorder(gauge: Gauge) extends MetricGroupRecorder {
def collect(context: CollectionContext): MetricGroupSnapshot =
UserGaugeSnapshot(gauge.collect(context))
def cleanup: Unit = gauge.cleanup
}
case class UserGaugeSnapshot(gaugeSnapshot: Histogram.Snapshot) extends MetricGroupSnapshot {
type GroupSnapshotType = UserGaugeSnapshot
def merge(that: UserGaugeSnapshot, context: CollectionContext): UserGaugeSnapshot =
UserGaugeSnapshot(that.gaugeSnapshot.merge(gaugeSnapshot, context))
def metrics: Map[MetricIdentity, MetricSnapshot] = Map((RecordedValues, gaugeSnapshot))
}
case object UserHistograms extends MetricGroupCategory { val name: String = "histogram" }
case object UserCounters extends MetricGroupCategory { val name: String = "counter" }
case object UserMinMaxCounters extends MetricGroupCategory { val name: String = "min-max-counter" }
case object UserGauges extends MetricGroupCategory { val name: String = "gauge" }
case object RecordedValues extends MetricIdentity { val name: String = "values" }
case object Count extends MetricIdentity { val name: String = "count" }
}
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