Scala example source code file (ReducePrime.scala)

This example Scala source code file (ReducePrime.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

companion, havingresult, int, int, intops, intwrap, intwrap, intwrapcreator, list, reduceprime, reduceprime, resettable, string, string

The Scala ReducePrime.scala source code

package scala.collection.parallel.benchmarks.parallel_array


import scala.collection.parallel.benchmarks._


object IntWrapCreator extends (Int => IntWrap) {
  def apply(idx: Int) = new IntWrap(shiftaround(idx))
  def shiftaround(idx: Int) = idx * 40192 + 717
}

case class IntWrap(val num: Int)

object IntOps {
  val op = (a: IntWrap, b: IntWrap) => primereduce(a, b)
  val reducer = new extra166y.Ops.Reducer[IntWrap] {
    def op(a: IntWrap, b: IntWrap) = primereduce(a, b)
  }
  
  def primereduce(a: IntWrap, b: IntWrap) = {
    val check = (checkPrime(a.num), checkPrime(b.num))
    if (a.num > b.num) a else b
  }
  
  def checkPrime(n: Int) = {
    var isPrime = true
    var i = 2
    val until = scala.math.sqrt(n).toInt + 1
    while (i < until) {
      if (n % i == 0) isPrime = false
      i += 1
    }
    isPrime
  }
}

class ReducePrime(sz: Int, p: Int, what: String)
extends Resettable[IntWrap](sz, p, what, IntWrapCreator, new Array[Any](_), classOf[IntWrap])
with HavingResult[IntWrap] {
  def companion = ReducePrime
  
  def runseq = runresult = sequentialReduce(IntOps.op, sz, new IntWrap(0))
  def runpar = runresult = pa.reduce(IntOps.op)
  def runjsr = runresult = jsrarr.reduce(IntOps.reducer, new IntWrap(0))
  override def comparisonMap = collection.Map("jsr" -> runjsr _)
}

object ReducePrime extends Companion {
  def benchName = "reduce-prime";
  def apply(sz: Int, p: Int, what: String) = new ReducePrime(sz, p, what)
  override def comparisons = List("jsr")
  override def defaultSize = 100
}