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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 com.typesafe.config.Config
import com.typesafe.scalalogging.Logger
import kamon.util.MeasurementUnit
import scala.collection.concurrent.TrieMap
import scala.concurrent.duration.Duration
class MetricRegistry(initialConfig: Config) extends MetricsSnapshotGenerator {
private val logger = Logger(classOf[MetricRegistry])
private val metrics = TrieMap.empty[String, MetricEntry]
private val instrumentFactory = new AtomicReference[InstrumentFactory]()
reconfigure(initialConfig)
def reconfigure(config: Config): Unit = synchronized {
instrumentFactory.set(InstrumentFactory.fromConfig(config))
}
def histogram(name: String, unit: MeasurementUnit, tags: Map[String, String], dynamicRange: Option[DynamicRange]): Histogram =
lookupInstrument(name, unit, tags, InstrumentTypes.Histogram, instrumentFactory.get().buildHistogram(dynamicRange))
def counter(name: String, unit: MeasurementUnit, tags: Map[String, String]): Counter =
lookupInstrument(name, unit, tags, InstrumentTypes.Counter, instrumentFactory.get().buildCounter)
def gauge(name: String, unit: MeasurementUnit, tags: Map[String, String]): Gauge =
lookupInstrument(name, unit, tags, InstrumentTypes.Gauge, instrumentFactory.get().buildGauge)
def minMaxCounter(name: String, unit: MeasurementUnit, tags: Map[String, String], dynamicRange: Option[DynamicRange], sampleInterval: Option[Duration]): MinMaxCounter =
lookupInstrument(name, unit, tags, InstrumentTypes.MinMaxCounter, instrumentFactory.get().buildMinMaxCounter(dynamicRange, sampleInterval))
override def snapshot(): MetricsSnapshot = synchronized {
var histograms = Seq.empty[MetricDistribution]
var mmCounters = Seq.empty[MetricDistribution]
var counters = Seq.empty[MetricValue]
var gauges = Seq.empty[MetricValue]
for {
metricEntry <- metrics.values
instrument <- metricEntry.instruments.values
} {
metricEntry.instrumentType match {
case InstrumentTypes.Histogram => histograms = histograms :+ instrument.asInstanceOf[SnapshotableHistogram].snapshot()
case InstrumentTypes.MinMaxCounter => mmCounters = mmCounters :+ instrument.asInstanceOf[SnapshotableMinMaxCounter].snapshot()
case InstrumentTypes.Gauge => gauges = gauges :+ instrument.asInstanceOf[SnapshotableGauge].snapshot()
case InstrumentTypes.Counter => counters = counters :+ instrument.asInstanceOf[SnapshotableCounter].snapshot()
case other => logger.warn("Unexpected instrument type [{}] found in the registry", other )
}
}
MetricsSnapshot(histograms, mmCounters, gauges, counters)
}
private def lookupInstrument[T](name: String, measurementUnit: MeasurementUnit, tags: Map[String, String],
instrumentType: InstrumentType, builder: (String, Map[String, String], MeasurementUnit) => T): T = {
val entry = metrics.atomicGetOrElseUpdate(name, MetricEntry(instrumentType, measurementUnit, TrieMap.empty))
if(entry.instrumentType != instrumentType)
sys.error(s"Tried to use metric [$name] as a [${instrumentType.name}] but it is already defined as [${entry.instrumentType.name}] ")
if(entry.unit != measurementUnit)
logger.warn("Ignoring attempt to use measurement unit [{}] on metric [name={}, tags={}], the metric uses [{}]",
measurementUnit.magnitude.name, name, tags.prettyPrint(), entry.unit.magnitude.name)
entry.instruments.getOrElseUpdate(tags, builder(name, tags, measurementUnit)).asInstanceOf[T]
}
private case class InstrumentType(name: String)
private object InstrumentTypes {
val Histogram = InstrumentType("Histogram")
val MinMaxCounter = InstrumentType("MinMaxCounter")
val Counter = InstrumentType("Counter")
val Gauge = InstrumentType("Gauge")
}
private case class MetricEntry(instrumentType: InstrumentType, unit: MeasurementUnit, instruments: TrieMap[Map[String, String], Any])
}
trait MetricsSnapshotGenerator {
def snapshot(): MetricsSnapshot
}
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