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Scala example source code file (ScanMedium.scala)

This example Scala source code file (ScanMedium.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, companion, cont, cont, int, int, list, resettable, scanmedium, scanmedium, string, string

The Scala ScanMedium.scala source code

package scala.collection.parallel.benchmarks.parallel_array


import scala.collection.parallel.benchmarks._
import scala.collection.parallel.mutable.ParArray


object ScanMedium extends Companion {
  def benchName = "scan-medium";
  def apply(sz: Int, parallelism: Int, what: String) = new ScanMedium(sz, parallelism, what)
  override def comparisons = List("jsr")
  override def defaultSize = 5000
  
  val op = (a: Cont, b: Cont) => {
    operation(a, b)
  }
  def operation(a: Cont, b: Cont) = {
    val m = if (a.in < 0) 1 else 0
    val k = calc(a.in, b.in, m)
    new Cont(a.in + b.in + k * m * (0 until 2).reduceLeft(_ + _))
  }
  private def calc(x: Int, y: Int, n: Int) = {
    var sum = x
    for (i <- 0 until 500) {
      sum += y + (if (sum % 2 == 0) n * x else y)
      if (sum % 5 == 0) sum -= x * y - n * (x + y)
    }
    sum
  }
}


class ScanMedium(sz: Int, p: Int, what: String)
extends Resettable[Cont](sz, p, what, new Cont(_), new Array[Any](_), classOf[Cont]) {
  def companion = ScanMedium
  override def repetitionsPerRun = 50
  override val runs = 12
  
  def runpar = pa.scan(new Cont(0))(ScanMedium.op)
  def runseq = sequentialScan(new Cont(0), ScanMedium.op, sz)
  def runjsr = jsrarr.cumulate(new extra166y.Ops.Reducer[Cont] {
    def op(a: Cont, b: Cont) = ScanMedium.operation(a, b)
  }, new Cont(0))
  override def comparisonMap = collection.Map("jsr" -> runjsr _)
}










Other Scala examples (source code examples)

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