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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 annotation.tailrec
import com.typesafe.config.Config
import kamon.metrics.MetricSnapshot.Measurement
import kamon.metrics.InstrumentTypes.InstrumentType
trait MetricGroupCategory {
def name: String
}
trait MetricGroupIdentity {
def name: String
def category: MetricGroupCategory
}
trait MetricIdentity {
def name: String
def tag: String
}
trait MetricGroupRecorder {
def collect: MetricGroupSnapshot
}
trait MetricGroupSnapshot {
def metrics: Map[MetricIdentity, MetricSnapshotLike]
}
case class DefaultMetricGroupSnapshot(metrics: Map[MetricIdentity, MetricSnapshotLike]) extends MetricGroupSnapshot
trait MetricRecorder {
def record(value: Long)
def collect(): MetricSnapshotLike
}
object InstrumentTypes {
sealed trait InstrumentType
case object Histogram extends InstrumentType
case object Gauge extends InstrumentType
case object Counter extends InstrumentType
}
trait MetricSnapshotLike {
def instrumentType: InstrumentType
def numberOfMeasurements: Long
def scale: Scale
def measurements: Vector[Measurement]
def max: Long = measurements.lastOption.map(_.value).getOrElse(0)
def min: Long = measurements.headOption.map(_.value).getOrElse(0)
def merge(that: MetricSnapshotLike): MetricSnapshotLike = {
val mergedMeasurements = Vector.newBuilder[Measurement]
@tailrec def go(left: Vector[Measurement], right: Vector[Measurement], totalNrOfMeasurements: Long): Long = {
if (left.nonEmpty && right.nonEmpty) {
val leftValue = left.head
val rightValue = right.head
if (rightValue.value == leftValue.value) {
val merged = rightValue.merge(leftValue)
mergedMeasurements += merged
go(left.tail, right.tail, totalNrOfMeasurements + merged.count)
} else {
if (leftValue.value < rightValue.value) {
mergedMeasurements += leftValue
go(left.tail, right, totalNrOfMeasurements + leftValue.count)
} else {
mergedMeasurements += rightValue
go(left, right.tail, totalNrOfMeasurements + rightValue.count)
}
}
} else {
if (left.isEmpty && right.nonEmpty) {
mergedMeasurements += right.head
go(left, right.tail, totalNrOfMeasurements + right.head.count)
} else {
if (left.nonEmpty && right.isEmpty) {
mergedMeasurements += left.head
go(left.tail, right, totalNrOfMeasurements + left.head.count)
} else totalNrOfMeasurements
}
}
}
val totalNrOfMeasurements = go(measurements, that.measurements, 0)
MetricSnapshot(instrumentType, totalNrOfMeasurements, scale, mergedMeasurements.result())
}
}
case class MetricSnapshot(instrumentType: InstrumentType, numberOfMeasurements: Long, scale: Scale,
measurements: Vector[MetricSnapshot.Measurement]) extends MetricSnapshotLike
object MetricSnapshot {
case class Measurement(value: Long, count: Long) {
def merge(that: Measurement) = Measurement(value, count + that.count)
}
}
trait MetricGroupFactory {
type GroupRecorder <: MetricGroupRecorder
def create(config: Config): GroupRecorder
}
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