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/* =========================================================================================
* Copyright © 2013-2017 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
package metric
import java.util.concurrent.atomic.AtomicReference
import kamon.metric.InstrumentFactory.InstrumentType
import kamon.metric.InstrumentFactory.InstrumentTypes._
import kamon.util.MeasurementUnit
import scala.collection.concurrent.TrieMap
import java.time.Duration
trait Metric[T] {
def name: String
def unit: MeasurementUnit
def refine(tags: Tags): T
def refine(tags: (String, String)*): T
def refine(tag: String, value: String): T
}
trait HistogramMetric extends Metric[Histogram] with Histogram
trait MinMaxCounterMetric extends Metric[MinMaxCounter] with MinMaxCounter
trait GaugeMetric extends Metric[Gauge] with Gauge
trait CounterMetric extends Metric[Counter] with Counter
abstract sealed class BaseMetric[T, S](val instrumentType: InstrumentType) extends Metric[T] {
private val instruments = TrieMap.empty[Tags, T]
protected lazy val baseInstrument: T = instruments.atomicGetOrElseUpdate(Map.empty, createInstrument(Map.empty))
def refine(tag: String, value: String): T = {
val instrumentTags = Map(tag -> value)
instruments.atomicGetOrElseUpdate(instrumentTags, createInstrument(instrumentTags))
}
def refine(tags: Map[String, String]): T =
instruments.atomicGetOrElseUpdate(tags, createInstrument(tags))
def refine(tags: (String, String)*): T =
refine(tags.toMap)
private[kamon] def snapshot(): Seq[S] =
instruments.values.map(createSnapshot).toSeq
protected def createInstrument(tags: Tags): T
protected def createSnapshot(instrument: T): S
}
private[kamon] final class HistogramMetricImpl(val name: String, val unit: MeasurementUnit, customDynamicRange: Option[DynamicRange],
factory: AtomicReference[InstrumentFactory]) extends BaseMetric[Histogram, MetricDistribution](Histogram) with HistogramMetric {
def dynamicRange: DynamicRange =
baseInstrument.dynamicRange
override def record(value: Long): Unit =
baseInstrument.record(value)
override def record(value: Long, times: Long): Unit =
baseInstrument.record(value, times)
override protected def createInstrument(tags: Tags): Histogram =
factory.get().buildHistogram(customDynamicRange)(name, tags, unit)
override protected def createSnapshot(instrument: Histogram): MetricDistribution =
instrument.asInstanceOf[AtomicHdrHistogram].snapshot(resetState = true)
}
private[kamon] final class MinMaxCounterMetricImpl(val name: String, val unit: MeasurementUnit, customDynamicRange: Option[DynamicRange],
customSampleInterval: Option[Duration], factory: AtomicReference[InstrumentFactory])
extends BaseMetric[MinMaxCounter, MetricDistribution](MinMaxCounter) with MinMaxCounterMetric {
def dynamicRange: DynamicRange =
baseInstrument.dynamicRange
override def sampleInterval: Duration =
baseInstrument.sampleInterval
override def increment(): Unit =
baseInstrument.increment()
override def increment(times: Long): Unit =
baseInstrument.increment(times)
override def decrement(): Unit =
baseInstrument.decrement()
override def decrement(times: Long): Unit =
baseInstrument.decrement(times)
override def sample(): Unit =
baseInstrument.sample()
override protected def createInstrument(tags: Tags): MinMaxCounter =
factory.get().buildMinMaxCounter(customDynamicRange, customSampleInterval)(name, tags, unit)
override protected def createSnapshot(instrument: MinMaxCounter): MetricDistribution =
instrument.asInstanceOf[SimpleMinMaxCounter].snapshot(resetState = true)
}
private[kamon] final class CounterMetricImpl(val name: String, val unit: MeasurementUnit, factory: AtomicReference[InstrumentFactory])
extends BaseMetric[Counter, MetricValue](Counter) with CounterMetric {
override def increment(): Unit =
baseInstrument.increment()
override def increment(times: Long): Unit =
baseInstrument.increment(times)
override protected def createInstrument(tags: Tags): Counter =
factory.get().buildCounter(name, tags, unit)
override protected def createSnapshot(instrument: Counter): MetricValue =
instrument.asInstanceOf[LongAdderCounter].snapshot(resetState = true)
}
private[kamon] final class GaugeMetricImpl(val name: String, val unit: MeasurementUnit, factory: AtomicReference[InstrumentFactory])
extends BaseMetric[Gauge, MetricValue](Gauge) with GaugeMetric {
override def increment(): Unit =
baseInstrument.increment()
override def increment(times: Long): Unit =
baseInstrument.increment(times)
override def decrement(): Unit =
baseInstrument.decrement()
override def decrement(times: Long): Unit =
baseInstrument.decrement(times)
override def set(value: Long): Unit =
baseInstrument.set(value)
override protected def createInstrument(tags: Tags): Gauge =
factory.get().buildGauge(name, tags, unit)
override protected def createSnapshot(instrument: Gauge): MetricValue =
instrument.asInstanceOf[AtomicLongGauge].snapshot()
}
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