Scala example source code file (ParMap.scala)

This example Scala source code file (ParMap.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

a, b, cancombinefrommap, collection, genericparmapcompanion, generics, genmap, k, map, mutable, parmap, u, v

The ParMap.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection.parallel

import scala.collection.Map
import scala.collection.GenMap
import scala.collection.mutable.Builder
import scala.collection.generic.ParMapFactory
import scala.collection.generic.GenericParMapTemplate
import scala.collection.generic.GenericParMapCompanion
import scala.collection.generic.CanCombineFrom

/** A template trait for parallel maps.
 *
 *  $sideeffects
 *
 *  @tparam K    the key type of the map
 *  @tparam V    the value type of the map
 *
 *  @author Aleksandar Prokopec
 *  @since 2.9
 */
trait ParMap[K, +V]
extends GenMap[K, V]
   with GenericParMapTemplate[K, V, ParMap]
   with ParIterable[(K, V)]
   with ParMapLike[K, V, ParMap[K, V], Map[K, V]]
{
self =>

  def mapCompanion: GenericParMapCompanion[ParMap] = ParMap

  //protected[this] override def newCombiner: Combiner[(K, V), ParMap[K, V]] = ParMap.newCombiner[K, V]

  def empty: ParMap[K, V] = new mutable.ParHashMap[K, V]

  override def stringPrefix = "ParMap"

  override def updated [U >: V](key: K, value: U): ParMap[K, U] = this + ((key, value))

  def + [U >: V](kv: (K, U)): ParMap[K, U]
}



object ParMap extends ParMapFactory[ParMap] {
  def empty[K, V]: ParMap[K, V] = new mutable.ParHashMap[K, V]

  def newCombiner[K, V]: Combiner[(K, V), ParMap[K, V]] = mutable.ParHashMapCombiner[K, V]

  implicit def canBuildFrom[K, V]: CanCombineFrom[Coll, (K, V), ParMap[K, V]] = new CanCombineFromMap[K, V]

  /** An abstract shell used by { mutable, immutable }.Map but not by collection.Map
   *  because of variance issues.
   */
  abstract class WithDefault[A, +B](underlying: ParMap[A, B], d: A => B) extends ParMap[A, B] {
    override def size               = underlying.size
    def get(key: A)                 = underlying.get(key)
    def splitter                    = underlying.splitter
    override def default(key: A): B = d(key)
  }
}