JarCastingScala parallel collections
This Scala standard module contains the package scala.collection.parallel, with all of the parallel collections that used to be part of the Scala standard library (in Scala 2.10 through 2.12).
For Scala 2.13 and Scala 3, this module is a separate JAR that can be omitted from projects that do not use parallel collections.
Documentation
- https://docs.scala-lang.org/overviews/parallel-collections/overview.html
- https://javadoc.io/doc/org.scala-lang.modules/scala-parallel-collections_2.13
Maintenance status
This module is community-maintained, under the guidance of the Scala team at Lightbend. If you are interested in participating, please jump right in on issues and pull requests.
Usage
To depend on scala-parallel-collections in sbt, add this to your build.sbt:
libraryDependencies +=
"org.scala-lang.modules" %% "scala-parallel-collections" % "1.0.0"
In your code, adding this import:
import scala.collection.parallel.CollectionConverters._
will enable use of the .par method as in earlier Scala versions.
Cross-building: dependency
This module is published only for the Scala 2.13 and 3.0 series, so in a cross-built project, the dependency should take this form:
libraryDependencies ++= {
CrossVersion.partialVersion(scalaVersion.value) match {
case Some((2, major)) if major <= 12 =>
Seq()
case _ =>
Seq("org.scala-lang.modules" %% "scala-parallel-collections" % "1.0.0")
}
}
This way of testing scalaVersion is robust across varying Scala version number formats (nightlies, milestones, release candidates, community build, etc).
Cross-building: source compatibility
Using .par is problematic in a cross-built project, since in Scala 2.13+ the CollectionConverters._ import shown above is necessary, but in earlier Scala versions, that import will not compile.
You may able to avoid the problem by directly constructing your parallel collections rather than going through .par. For other possible workarounds, see https://github.com/scala/scala-parallel-collections/issues/22, which is still under discussion.
Releasing
As with other Scala standard modules, build and release infrastructure is provided by the sbt-scala-modules sbt plugin.
