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import java.util.concurrent._
import scala.collection._
import scala.collection.JavaConverters._
import org.scalacheck._
import org.scalacheck.Prop._
import org.scalacheck.Gen._
object ConcurrentMapTest extends Properties("concurrent.TrieMap") {
case class Wrap(i: Int) {
override def hashCode = i * 0x9e3775cd
}
/* generators */
val sizes = choose(0, 20000)
val threadCounts = choose(2, 16)
val threadCountsAndSizes = for {
p <- threadCounts
sz <- sizes
} yield (p, sz);
/* helpers */
def inParallel[T](totalThreads: Int)(body: Int => T): Seq[T] = {
val threads = for (idx <- 0 until totalThreads) yield new Thread {
setName("ParThread-" + idx)
private var res: T = _
override def run() {
res = body(idx)
}
def result = {
this.join()
res
}
}
threads foreach (_.start())
threads map (_.result)
}
property("concurrent getOrElseUpdate insertions") = forAll(threadCounts, sizes) {
(p, sz) =>
val chm = new ConcurrentHashMap[Wrap, Int]().asScala
val results = inParallel(p) {
idx =>
for (i <- 0 until sz) yield chm.getOrElseUpdate(new Wrap(i), idx)
}
val resultSets = for (i <- 0 until sz) yield results.map(_(i)).toSet
val largerThanOne = resultSets.zipWithIndex.find(_._1.size != 1)
val allThreadsAgreeOnWhoInserted = {
largerThanOne == None
} :| s"$p threads agree on who inserted [disagreement (differentResults, position) = $largerThanOne]"
allThreadsAgreeOnWhoInserted
}
}
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