alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (ReduceList.scala)

This example Scala source code file (ReduceList.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, int, int, list, list, listcreator, listops, reducelist, reducelist, resettable, string, string

The Scala ReduceList.scala source code

package scala.collection.parallel.benchmarks.parallel_array




object ReduceList extends Companion {
  def benchName = "reduce-list";
  def apply(sz: Int, p: Int, what: String) = new ReduceList(sz, p, what)
  override def comparisons = List("jsr")
  override def defaultSize = 20000
}

object ListCreator extends (Int => List[Int]) {
  def apply(idx: Int) = {
    val len = 50 + idx % 100
    (for (i <- 0 until len) yield i).toList
  }
}

object ListOps {
  val redop = (a: List[Int], b: List[Int]) => combineLists(a, b)
  val reducer = new extra166y.Ops.Reducer[List[Int]] {
    def op(a: List[Int], b: List[Int]) = combineLists(a, b)
  }
  def combineLists(a: List[Int], b: List[Int]) = {
    if (a.foldLeft(0)(_ + _) > b.foldLeft(0)(_ + _)) a else b
  }
}

class ReduceList(sz: Int, p: Int, what: String)
extends Resettable[List[Int]](sz, p, what, ListCreator, new Array[Any](_), classOf[List[Int]]) {
  def companion = ReduceList
  override def repetitionsPerRun = 10
  override val runs = 15
  
  def runpar = pa.reduce(ListOps.redop)
  def runseq = sequentialReduce(ListOps.redop, sz, List[Int]())
  def runjsr = jsrarr.reduce(ListOps.reducer, List[Int]())
  override def comparisonMap = collection.Map("jsr" -> runjsr _)
}













Other Scala examples (source code examples)

Here is a short list of links related to this Scala ReduceList.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.