akka.util.PrettyDuration.scala Maven / Gradle / Ivy
/*
* Copyright (C) 2009-2020 Lightbend Inc.
*/
package akka.util
import java.util.Locale
import scala.concurrent.duration._
/** INTERNAL API */
private[akka] object PrettyDuration {
/**
* JAVA API
* Selects most appropriate TimeUnit for given duration and formats it accordingly, with 4 digits precision
*/
def format(duration: Duration): String = duration.pretty
/**
* JAVA API
* Selects most appropriate TimeUnit for given duration and formats it accordingly
*/
def format(duration: Duration, includeNanos: Boolean, precision: Int): String =
duration.pretty(includeNanos, precision)
implicit class PrettyPrintableDuration(val duration: Duration) extends AnyVal {
/** Selects most appropriate TimeUnit for given duration and formats it accordingly, with 4 digits precision **/
def pretty: String = pretty(includeNanos = false)
/** Selects most appropriate TimeUnit for given duration and formats it accordingly */
def pretty(includeNanos: Boolean, precision: Int = 4): String = {
require(precision > 0, "precision must be > 0")
duration match {
case d: FiniteDuration =>
val nanos = d.toNanos
val unit = chooseUnit(nanos)
val value = nanos.toDouble / NANOSECONDS.convert(1, unit)
s"%.${precision}g %s%s".formatLocal(
Locale.ROOT,
value,
abbreviate(unit),
if (includeNanos) s" ($nanos ns)" else "")
case Duration.MinusInf => s"-∞ (minus infinity)"
case Duration.Inf => s"∞ (infinity)"
case _ => "undefined"
}
}
def chooseUnit(nanos: Long): TimeUnit = {
val d = nanos.nanos
if (d.toDays > 0) DAYS
else if (d.toHours > 0) HOURS
else if (d.toMinutes > 0) MINUTES
else if (d.toSeconds > 0) SECONDS
else if (d.toMillis > 0) MILLISECONDS
else if (d.toMicros > 0) MICROSECONDS
else NANOSECONDS
}
def abbreviate(unit: TimeUnit): String = unit match {
case NANOSECONDS => "ns"
case MICROSECONDS => "μs"
case MILLISECONDS => "ms"
case SECONDS => "s"
case MINUTES => "min"
case HOURS => "h"
case DAYS => "d"
}
}
}