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Adding benchmarking: made generators for collections.
Also retrofitted stream converters so you can use them generically.
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-11
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5 files changed

+111
-11
lines changed

‎benchmark/build.sbt‎

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enablePlugins(JmhPlugin)
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lazy val root = (project in file(".")).settings(
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name := "java8-compat-bench",
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scalaVersion := "2.11.7",
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crossScalaVersions := List("2.11.7" /* TODO, "2.12.0-M3"*/),
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organization := "org.scala-lang.modules",
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version := "0.6.0-SNAPSHOT",
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unmanagedJars in Compile ++= Seq(baseDirectory.value / "../target/scala-2.11/scala-java8-compat_2.11-0.6.0-SNAPSHOT.jar")
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)

‎benchmark/project/plugins.sbt‎

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addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.2.4")

‎benchmark/src/main/scala/bench/CollectionSource.scala‎

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package bench
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import java.util.stream._
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import scala.collection.generic.CanBuildFrom
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import scala.compat.java8.StreamConverters._
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import scala.compat.java8.collectionImpl._
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import scala.compat.java8.converterImpl._
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package object generate {
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private def myInty(n: Int) = 0 until n
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private def myStringy(n: Int) = myInty(n).map(i => (i*i).toString)
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object Coll {
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def i[CC[_]](n: Int)(implicit cbf: CanBuildFrom[Nothing, Int, CC[Int]]): CC[Int] = {
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val b = cbf();
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myInty(n).foreach(b += _)
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b.result()
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}
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def s[CC[_]](n: Int)(implicit cbf: CanBuildFrom[Nothing, String, CC[String]]): CC[String] = {
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val b = cbf();
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myStringy(n).foreach(b += _)
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b.result()
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}
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}
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object Pstep {
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def i[CC](cc: CC)(implicit steppize: CC => MakesIntStepper): IntStepper =
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steppize(cc).stepper
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def s[CC](cc: CC)(implicit steppize: CC => MakesAnyStepper[String]): AnyStepper[String] =
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steppize(cc).stepper
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}
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object Sstep {
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def i[CC](cc: CC)(implicit steppize: CC => MakesIntSeqStepper): IntStepper =
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steppize(cc).stepper
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def s[CC](cc: CC)(implicit steppize: CC => MakesAnySeqStepper[String]): AnyStepper[String] =
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steppize(cc).stepper
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}
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object PsStream {
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def i[CC](cc: CC)(implicit steppize: CC => MakesIntStepper): IntStream =
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steppize(cc).stepper.parStream
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def s[CC](cc: CC)(implicit steppize: CC => MakesAnyStepper[String]): Stream[String] =
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steppize(cc).stepper.parStream
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}
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object SsStream {
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def i[CC](cc: CC)(implicit steppize: CC => MakesIntSeqStepper): IntStream =
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steppize(cc).stepper.seqStream
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def s[CC](cc: CC)(implicit steppize: CC => MakesAnySeqStepper[String]): Stream[String] =
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steppize(cc).stepper.seqStream
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}
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object Sstream {
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def i[CC](cc: CC)(implicit streamize: CC => MakesSequentialStream[java.lang.Integer, IntStream]) =
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streamize(cc).seqStream
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def s[CC](cc: CC)(implicit streamize: CC => MakesSequentialStream[String, Stream[String]]) =
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streamize(cc).seqStream
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}
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object Pstream {
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def i[CC](cc: CC)(implicit streamize: CC => MakesParallelStream[java.lang.Integer, IntStream]) =
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streamize(cc).parStream
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def s[CC](cc: CC)(implicit streamize: CC => MakesParallelStream[String, Stream[String]]) =
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streamize(cc).parStream
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}
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}

‎src/main/scala/scala/compat/java8/StreamConverters.scala‎

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Original file line numberDiff line numberDiff line change
@@ -16,7 +16,8 @@ trait PrimitiveStreamUnboxer[A, S] {
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trait Priority5StreamConverters {
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// Note--conversion is only to make sure implicit conversion priority is lower than alternatives.
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implicit class EnrichScalaCollectionWithSeqStream[A, CC](cc: CC)(implicit steppize: CC => MakesAnySeqStepper[A]) {
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implicit class EnrichScalaCollectionWithSeqStream[A, CC](cc: CC)(implicit steppize: CC => MakesAnySeqStepper[A])
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extends MakesSequentialStream[A, Stream[A]] {
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def seqStream: Stream[A] = StreamSupport.stream(steppize(cc).stepper, false)
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}
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implicit class EnrichScalaCollectionWithKeySeqStream[K, CC](cc: CC)(implicit steppize: CC => MakesAnyKeySeqStepper[K]) {
@@ -28,13 +29,16 @@ trait Priority5StreamConverters {
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}
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trait Priority4StreamConverters extends Priority5StreamConverters {
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implicit class EnrichScalaCollectionWithSeqDoubleStream[CC](cc: CC)(implicit steppize: CC => MakesDoubleSeqStepper) {
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implicit class EnrichScalaCollectionWithSeqDoubleStream[CC](cc: CC)(implicit steppize: CC => MakesDoubleSeqStepper)
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extends MakesSequentialStream[java.lang.Double, DoubleStream] {
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def seqStream: DoubleStream = StreamSupport.doubleStream(steppize(cc).stepper, false)
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}
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implicit class EnrichScalaCollectionWithSeqIntStream[CC](cc: CC)(implicit steppize: CC => MakesIntSeqStepper) {
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implicit class EnrichScalaCollectionWithSeqIntStream[CC](cc: CC)(implicit steppize: CC => MakesIntSeqStepper)
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extends MakesSequentialStream[java.lang.Integer, IntStream] {
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def seqStream: IntStream = StreamSupport.intStream(steppize(cc).stepper, false)
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}
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implicit class EnrichScalaCollectionWithSeqLongStream[CC](cc: CC)(implicit steppize: CC => MakesLongSeqStepper) {
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implicit class EnrichScalaCollectionWithSeqLongStream[CC](cc: CC)(implicit steppize: CC => MakesLongSeqStepper)
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extends MakesSequentialStream[java.lang.Long, LongStream] {
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def seqStream: LongStream = StreamSupport.longStream(steppize(cc).stepper, false)
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}
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implicit class EnrichScalaCollectionWithSeqDoubleKeyStream[CC](cc: CC)(implicit steppize: CC => MakesDoubleKeySeqStepper) {
@@ -58,7 +62,8 @@ trait Priority4StreamConverters extends Priority5StreamConverters {
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}
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trait Priority3StreamConverters extends Priority4StreamConverters {
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implicit class EnrichAnySteppableWithStream[A, CC](cc: CC)(implicit steppize: CC => MakesAnyStepper[A]) {
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implicit class EnrichAnySteppableWithStream[A, CC](cc: CC)(implicit steppize: CC => MakesAnyStepper[A])
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extends MakesSequentialStream[A, Stream[A]] with MakesParallelStream[A, Stream[A]] {
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def seqStream: Stream[A] = StreamSupport.stream(steppize(cc).stepper, false)
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def parStream: Stream[A] = StreamSupport.stream(steppize(cc).stepper.anticipateParallelism, true)
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}
@@ -73,7 +78,8 @@ trait Priority3StreamConverters extends Priority4StreamConverters {
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}
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trait Priority2StreamConverters extends Priority3StreamConverters {
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implicit class EnrichDoubleSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesDoubleStepper) {
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implicit class EnrichDoubleSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesDoubleStepper)
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extends MakesSequentialStream[java.lang.Double, DoubleStream] with MakesParallelStream[java.lang.Double, DoubleStream] {
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def seqStream: DoubleStream = StreamSupport.doubleStream(steppize(cc).stepper, false)
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def parStream: DoubleStream = StreamSupport.doubleStream(steppize(cc).stepper.anticipateParallelism, true)
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}
@@ -85,7 +91,8 @@ trait Priority2StreamConverters extends Priority3StreamConverters {
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def seqValueStream: DoubleStream = StreamSupport.doubleStream(steppize(cc).valueStepper, false)
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def parValueStream: DoubleStream = StreamSupport.doubleStream(steppize(cc).valueStepper.anticipateParallelism, true)
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}
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implicit class EnrichIntSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesIntStepper) {
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implicit class EnrichIntSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesIntStepper)
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extends MakesSequentialStream[java.lang.Integer, IntStream] with MakesParallelStream[java.lang.Integer, IntStream] {
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def seqStream: IntStream = StreamSupport.intStream(steppize(cc).stepper, false)
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def parStream: IntStream = StreamSupport.intStream(steppize(cc).stepper.anticipateParallelism, true)
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}
@@ -97,7 +104,8 @@ trait Priority2StreamConverters extends Priority3StreamConverters {
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def seqValueStream: IntStream = StreamSupport.intStream(steppize(cc).valueStepper, false)
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def parValueStream: IntStream = StreamSupport.intStream(steppize(cc).valueStepper.anticipateParallelism, true)
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}
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implicit class EnrichLongSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesLongStepper) {
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implicit class EnrichLongSteppableWithStream[CC](cc: CC)(implicit steppize: CC => MakesLongStepper)
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extends MakesSequentialStream[java.lang.Long, LongStream] with MakesParallelStream[java.lang.Long, LongStream] {
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def seqStream: LongStream = StreamSupport.longStream(steppize(cc).stepper, false)
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def parStream: LongStream = StreamSupport.longStream(steppize(cc).stepper.anticipateParallelism, true)
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}
@@ -200,17 +208,20 @@ extends Priority1StreamConverters
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with converterImpl.Priority1StepConverters
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with converterImpl.Priority1AccumulatorConverters
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{
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implicit class EnrichDoubleArrayWithStream(a: Array[Double]) {
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implicit class EnrichDoubleArrayWithStream(a: Array[Double])
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extends MakesSequentialStream[java.lang.Double, DoubleStream] with MakesParallelStream[java.lang.Double, DoubleStream] {
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def seqStream: DoubleStream = java.util.Arrays.stream(a)
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def parStream: DoubleStream = seqStream.parallel
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}
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implicit class EnrichIntArrayWithStream(a: Array[Int]) {
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implicit class EnrichIntArrayWithStream(a: Array[Int])
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extends MakesSequentialStream[java.lang.Integer, IntStream] with MakesParallelStream[java.lang.Integer, IntStream] {
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def seqStream: IntStream = java.util.Arrays.stream(a)
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def parStream: IntStream = seqStream.parallel
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}
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implicit class EnrichLongArrayWithStream(a: Array[Long]) {
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implicit class EnrichLongArrayWithStream(a: Array[Long])
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extends MakesSequentialStream[java.lang.Long, LongStream] with MakesParallelStream[java.lang.Long, LongStream] {
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def seqStream: LongStream = java.util.Arrays.stream(a)
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def parStream: LongStream = seqStream.parallel
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}

‎src/main/scala/scala/compat/java8/converterImpl/MakesSteppers.scala‎

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@@ -5,6 +5,16 @@ import language.implicitConversions
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import scala.compat.java8.collectionImpl._
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import scala.compat.java8.runtime._
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/** Classes or objects implementing this trait create streams suitable for sequential use */
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trait MakesSequentialStream[A, SS <: java.util.stream.BaseStream[A, SS]] extends Any {
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def seqStream: SS
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}
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/** Classes or objects implementing this trait create streams suitable for parallel use */
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trait MakesParallelStream[A, SS <: java.util.stream.BaseStream[A, SS]] extends Any {
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def parStream: SS
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}
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/** Classes or objects implementing this trait create generic steppers suitable for sequential use. */
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trait MakesAnySeqStepper[A] extends Any {
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/** Generates a fresh stepper over `A`s suitable for sequential use */

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