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Scala example source code file (MultipleCombine.scala)

This example Scala source code file (MultipleCombine.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

array, array, bench, hashmap, hashtrie, int, int, intinit, map, multiplecombine, multiplecombine, string, string, unsupportedoperationexception

The Scala MultipleCombine.scala source code

package scala.collection.parallel.benchmarks
package hashtries




import collection.immutable.{HashMap => HashTrie}
import collection.mutable.HashMap






class MultipleCombine(val size: Int, val parallelism: Int, val runWhat: String) extends Bench with IntInit {
  var combines = 10
  
  var thattries = new Array[HashTrie[Int, Int]](combines)
  def initTries = for (r <- 0 until combines) {
    var thattrie = new HashTrie[Int, Int]
    for (i <- ((r + 1) * size) until ((r + 2) * size)) thattrie += ((i, i))
    thattries(r) = thattrie
  }
  initTries
  
  val thatmaps = new Array[HashMap[Int, Int]](10)
  def initMaps = for (r <- 0 until combines) {
    var thatmap = new HashMap[Int, Int]
    for (i <- ((r + 1) * size) until ((r + 2) * size)) thatmap += ((i, i))
    thatmaps(r) = thatmap
  }
  initMaps
  
  override def repetitionsPerRun = 25
  def runpar = throw new UnsupportedOperationException
  def runseq = runhashtrie
  def runhashtrie = {
    initHashTrie
    var trie = hashtrie
    for (r <- 0 until combines) trie = trie merge thattries(r)
  }
  def runappendtrie = {
    initHashTrie
    var trie = hashtrie
    for (r <- 0 until combines) trie = trie ++ thattries(r)
  }
  def runhashmap = {
    initHashMap
    var map = hashmap
    for (r <- 0 until combines) map = map ++ thatmaps(r)
  }
  def rundestructive = {
    initHashTrie
    var trie = hashtrie
    for (r <- 0 until combines) trie = trie merge thattries(r)
  }
  def companion = MultipleCombine
  def comparisonMap = Map("hashtrie" -> runhashtrie _, "hashmap" -> runhashmap _, "appendtrie" -> runappendtrie _, "destruct" -> rundestructive _)
  override def reset = runWhat match {
    case "appendtrie" => initHashTrie
    case "destruct" => initHashTrie
    case _ => super.reset
  }
}


object MultipleCombine extends BenchCompanion {
  def collectionName = "HashTrie"
  def benchName = "multi-combine";
  def apply(sz: Int, p: Int, what: String) = new MultipleCombine(sz, p, what)
  override def defaultSize = 5000
}















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