1 files changed, 55 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metric/instrument/UnitOfMeasurement.scala b/kamon-core/src/main/scala/kamon/metric/instrument/UnitOfMeasurement.scala
new file mode 100644
index 00000000..cf6b8b4c
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/metric/instrument/UnitOfMeasurement.scala
@@ -0,0 +1,55 @@
+package kamon.metric.instrument
+
+trait UnitOfMeasurement {
+  def name: String
+  def label: String
+  def factor: Double
+}
+
+object UnitOfMeasurement {
+  case object Unknown extends UnitOfMeasurement {
+    val name = "unknown"
+    val label = "unknown"
+    val factor = 1D
+  }
+
+  def isUnknown(uom: UnitOfMeasurement): Boolean =
+    uom == Unknown
+
+  def isTime(uom: UnitOfMeasurement): Boolean =
+    uom.isInstanceOf[Time]
+
+}
+
+case class Time(factor: Double, label: String) extends UnitOfMeasurement {
+  val name = "time"
+
+  /**
+   *  Scale a value from this scale factor to a different scale factor.
+   *
+   * @param toUnit Time unit of the expected result.
+   * @param value Value to scale.
+   * @return Equivalent of value on the target time unit.
+   */
+  def scale(toUnit: Time)(value: Long): 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")
+}
+
+case class Memory(factor: Double, label: String) extends UnitOfMeasurement {
+  val name = "bytes"
+}
+
+object Memory {
+  val Bytes = Memory(1, "b")
+  val KiloBytes = Memory(1024, "Kb")
+  val MegaBytes = Memory(1024E2, "Mb")
+  val GigaBytes = Memory(1024E3, "Gb")
+}
+