Converting Java to Scala durations
Solution 1:
I don't know whether an explicit conversion is the only way, but if you want to do it right
FiniteDuration(d.toNanos, TimeUnit.NANOSECONDS)
toNanos
will return the total duration, while getNano
will only return the nanoseconds component, which is not what you want.
E.g.
import java.time.Duration
import jata.time.temporal.ChronoUnit
Duration.of(1, ChronoUnit.HOURS).getNano // 0
Duration.of(1, ChronoUnit.HOURS).toNanos // 3600000000000L
That being said, you can also roll your own implicit conversion
implicit def asFiniteDuration(d: java.time.Duration) =
scala.concurrent.duration.Duration.fromNanos(d.toNanos)
and when you have it in scope:
val d: FiniteDuration = ConfigFactory.load().getDuration("application.someTimeout")
Solution 2:
Starting Scala 2.13
, there is a dedicated DurationConverter
from java's Duration
to scala's FiniteDuration
(and vice versa):
import scala.jdk.DurationConverters._
// val javaDuration = java.time.Duration.ofNanos(123456)
javaDuration.toScala
// scala.concurrent.duration.FiniteDuration = 123456 nanoseconds