
Scala example source code file (RecursiveTask.java)
The RecursiveTask.java Scala example source code/* * Written by Doug Lea with assistance from members of JCP JSR166 * Expert Group and released to the public domain, as explained at * http://creativecommons.org/publicdomain/zero/1.0/ */ package scala.concurrent.forkjoin; /** * A recursive resultbearing {@link ForkJoinTask}. * * <p>For a classic example, here is a task computing Fibonacci numbers: * * <pre> {@code * class Fibonacci extends RecursiveTask<Integer> { * final int n; * Fibonacci(int n) { this.n = n; } * Integer compute() { * if (n <= 1) * return n; * Fibonacci f1 = new Fibonacci(n  1); * f1.fork(); * Fibonacci f2 = new Fibonacci(n  2); * return f2.compute() + f1.join(); * } * }}</pre> * * However, besides being a dumb way to compute Fibonacci functions * (there is a simple fast linear algorithm that you'd use in * practice), this is likely to perform poorly because the smallest * subtasks are too small to be worthwhile splitting up. Instead, as * is the case for nearly all fork/join applications, you'd pick some * minimum granularity size (for example 10 here) for which you always * sequentially solve rather than subdividing. * * @since 1.7 * @author Doug Lea */ public abstract class RecursiveTask<V> extends ForkJoinTask<V> { private static final long serialVersionUID = 5232453952276485270L; /** * The result of the computation. */ V result; /** * The main computation performed by this task. */ protected abstract V compute(); public final V getRawResult() { return result; } protected final void setRawResult(V value) { result = value; } /** * Implements execution conventions for RecursiveTask. */ protected final boolean exec() { result = compute(); return true; } } Other Scala source code examplesHere is a short list of links related to this Scala RecursiveTask.java source code file: 
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