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Scala 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 3 and Scala 2.13, 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" % "<version>"
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 3 and 2.13, 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" % "<version>")
}
}
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-module sbt plugin.