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/*
* =========================================================================================
* Copyright © 2013-2015 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.metric.instrument
/**
* A UnitOfMeasurement implementation describes the magnitude of a quantity being measured, such as Time and computer
* Memory space. Kamon uses UnitOfMeasurement implementations just as a informative companion to metrics inside entity
* recorders and might be used to scale certain kinds of measurements in metric backends.
*/
trait UnitOfMeasurement {
def name: String
def label: String
}
object UnitOfMeasurement {
case object Unknown extends UnitOfMeasurement {
val name = "unknown"
val label = "unknown"
}
def isUnknown(uom: UnitOfMeasurement): Boolean =
uom == Unknown
def isTime(uom: UnitOfMeasurement): Boolean =
uom.isInstanceOf[Time]
def isMemory(uom: UnitOfMeasurement): Boolean =
uom.isInstanceOf[Memory]
}
/**
* UnitOfMeasurement representing time.
*/
case class Time(factor: Double, label: String) extends UnitOfMeasurement {
val name = "time"
def scale(toUnit: Time)(value: Double): Double =
(value * factor) / toUnit.factor
}
object Time {
val Nanoseconds = Time(1E-9, "n")
val Microseconds = Time(1E-6, "µs")
val Milliseconds = Time(1E-3, "ms")
val Seconds = Time(1, "s")
}
/**
* UnitOfMeasurement representing computer memory space.
*/
case class Memory(factor: Double, label: String) extends UnitOfMeasurement {
val name = "bytes"
def scale(toUnit: Memory)(value: Double): Double =
(value * factor) / toUnit.factor
}
object Memory {
val Bytes = Memory(1, "b")
val KiloBytes = Memory(1024, "Kb")
val MegaBytes = Memory(1024E2, "Mb")
val GigaBytes = Memory(1024E3, "Gb")
}
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