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Standardized duration conversion and always make it coarsest possible. (
#716)
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67 changes: 67 additions & 0 deletions
67
squbs-ext/src/main/scala/org/squbs/util/DurationConverters.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * Copyright (C) 2012-2017 Typesafe Inc. <http://www.typesafe.com> | ||
| */ | ||
| package org.squbs.util | ||
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| import java.time.temporal.ChronoUnit | ||
| import java.util.concurrent.TimeUnit | ||
| import java.time.{Duration => JavaDuration} | ||
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| import scala.concurrent.duration.{FiniteDuration, Duration => ScalaDuration} | ||
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| /** | ||
| * This class contains static methods which convert between Java Durations | ||
| * and the durations from the Scala concurrency package. This is useful when mediating between Scala and Java | ||
| * libraries with asynchronous APIs where timeouts for example are often expressed as durations. | ||
| */ | ||
| object DurationConverters { | ||
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| /** | ||
| * Transform a Java duration into a Scala duration. If the nanosecond part of the Java duration is zero the returned | ||
| * duration will have a time unit of seconds and if nthere is a nanoseconds part the Scala duration will have a time | ||
| * unit of nanoseconds. | ||
| * | ||
| * @throws IllegalArgumentException If the given Java Duration is out of bounds of what can be expressed with the | ||
| * Scala FiniteDuration. | ||
| */ | ||
| final def toScala(duration: java.time.Duration): scala.concurrent.duration.FiniteDuration = { | ||
| val originalSeconds = duration.getSeconds | ||
| val originalNanos = duration.getNano | ||
| if (originalNanos == 0) { | ||
| if (originalSeconds == 0) ScalaDuration.Zero | ||
| else FiniteDuration(originalSeconds, TimeUnit.SECONDS).toCoarsest.asInstanceOf[FiniteDuration] | ||
| } else if (originalSeconds == 0) { | ||
| FiniteDuration(originalNanos, TimeUnit.NANOSECONDS).toCoarsest.asInstanceOf[FiniteDuration] | ||
| } else { | ||
| try { | ||
| val secondsAsNanos = Math.multiplyExact(originalSeconds, 1000000000) | ||
| val totalNanos = secondsAsNanos + originalNanos | ||
| if ((totalNanos < 0 && secondsAsNanos < 0) || (totalNanos > 0 && secondsAsNanos > 0)) | ||
| FiniteDuration(totalNanos, TimeUnit.NANOSECONDS).toCoarsest.asInstanceOf[FiniteDuration] | ||
| else | ||
| throw new ArithmeticException() | ||
| } catch { | ||
| case _: ArithmeticException => | ||
| throw new IllegalArgumentException(s"Java duration $duration cannot be expressed as a Scala duration") | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Transform a Scala FiniteDuration into a Java duration. Note that the Scala duration keeps the time unit it was created | ||
| * with while a Java duration always is a pair of seconds and nanos, so the unit it lost. | ||
| */ | ||
| final def toJava(duration: scala.concurrent.duration.FiniteDuration): java.time.Duration = { | ||
| if (duration.length == 0) JavaDuration.ZERO | ||
| else duration.unit match { | ||
| case TimeUnit.NANOSECONDS => JavaDuration.ofNanos(duration.length) | ||
| case TimeUnit.MICROSECONDS => JavaDuration.of(duration.length, ChronoUnit.MICROS) | ||
| case TimeUnit.MILLISECONDS => JavaDuration.ofMillis(duration.length) | ||
| case TimeUnit.SECONDS => JavaDuration.ofSeconds(duration.length) | ||
| case TimeUnit.MINUTES => JavaDuration.ofMinutes(duration.length) | ||
| case TimeUnit.HOURS => JavaDuration.ofHours(duration.length) | ||
| case TimeUnit.DAYS => JavaDuration.ofDays(duration.length) | ||
| } | ||
| } | ||
| } |
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