JDK 7 中的 Fork/Join 模式

import jsr166y.forkjoin.ForkJoinPool;
import jsr166y.forkjoin.ForkJoinTask;
import jsr166y.forkjoin.RecursiveAction;

import org.junit.Before;
import org.junit.Test;

class SortTask extends RecursiveAction {
    final long[] array;
    final int lo;
    final int hi;
    private int THRESHOLD = 0; //For demo only

    public SortTask(long[] array) {
        this.array = array;
        this.lo = 0;
        this.hi = array.length - 1;
    }

    public SortTask(long[] array, int lo, int hi) {
        this.array = array;
        this.lo = lo;
        this.hi = hi;
    }

    protected void compute() {
        if (hi - lo < THRESHOLD)
            sequentiallySort(array, lo, hi);
        else {
            int pivot = partition(array, lo, hi);
            System.out.println("\npivot = " + pivot + ", low = " + lo + ", high = " + hi);
   System.out.println("array" + Arrays.toString(array));
            coInvoke(new SortTask(array, lo, pivot - 1), new SortTask(array,
                    pivot + 1, hi));
        }
    }

    private int partition(long[] array, int lo, int hi) {
        long x = array[hi];
        int i = lo - 1;
        for (int j = lo; j < hi; j++) {
            if (array[j] <= x) {
                i++;
                swap(array, i, j);
            }
        }
        swap(array, i + 1, hi);
        return i + 1;
    }

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