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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
trait MetricGroupCategory {
def name: String
}
trait MetricGroupIdentity {
def name: String
def category: MetricGroupCategory
}
trait MetricIdentity {
def name: String
def tag: String
}
trait MetricGroupRecorder {
def record(identity: MetricIdentity, value: Long)
def collect: MetricGroupSnapshot
}
trait MetricGroupSnapshot {
def metrics: Map[MetricIdentity, MetricSnapshot]
}
trait MetricRecorder {
def record(value: Long)
def collect(): MetricSnapshot
}
trait MetricSnapshot {
def numberOfMeasurements: Long
def measurementLevels: Vector[Measurement]
def max: Long = measurementLevels.lastOption.map(_.value).getOrElse(0)
def min: Long = measurementLevels.headOption.map(_.value).getOrElse(0)
def merge(that: MetricSnapshot): MetricSnapshot = {
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(measurementLevels, that.measurementLevels, 0)
DefaultMetricSnapshot(totalNrOfMeasurements, mergedMeasurements.result())
}
}
object MetricSnapshot {
case class Measurement(value: Long, count: Long) {
def merge(that: Measurement) = Measurement(value, count + that.count)
}
}
case class DefaultMetricSnapshot(numberOfMeasurements: Long, measurementLevels: Vector[MetricSnapshot.Measurement]) extends MetricSnapshot
object DefaultMetricSnapshot {
val empty = DefaultMetricSnapshot(0, Vector.empty)
}
trait MetricGroupFactory {
type GroupRecorder <: MetricGroupRecorder
def create(config: Config): GroupRecorder
}
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