FastFlow Java Buffer implementation (GPL)

/*
 *  License: GPL
 *  Origin: FastForwd (C++ template library)
 */

import java.util.concurrent.CountDownLatch;

@SuppressWarnings("unused")
final public class FFBuffer<T> {
    private int _pad000,_pad001,_pad002,_pad003,_pad004,_pad005,_pad006,_pad007;
    private int _pad008,_pad009,_pad00a,_pad00b,_pad00c,_pad00d,_pad00e,_pad00f;
    private int pread, _pread0;
    private int _pad100,_pad101,_pad102,_pad103,_pad104,_pad105,_pad106,_pad107;
    private int _pad108,_pad109,_pad10a,_pad10b,_pad10c,_pad10d,_pad10e,_pad10f;
    private int pwrite, _pwrite0;
    private int _pad200,_pad201,_pad202,_pad203,_pad204,_pad205,_pad206,_pad207;
    private int _pad208,_pad209,_pad20a,_pad20b,_pad20c,_pad20d,_pad20e,_pad20f;
    private final int size; private int size0;
    private final int POW;  private int POW0;
    private final int mask; private int mask0;
    private T _pad300,_pad301,_pad302,_pad303,_pad304,_pad305,_pad306,_pad307;
    private T _pad308,_pad309,_pad30a,_pad30b,_pad30c,_pad30d,_pad30e,_pad30f;
    private final T data[];
    private T _pad400,_pad401,_pad402,_pad403,_pad404,_pad405,_pad406,_pad407;
    private T _pad408,_pad409,_pad40a,_pad40b,_pad40c,_pad40d,_pad40e,_pad40f;

    public FFBuffer(int sizeByPowerOfTwo, int pow) {
        this.size = 1 << sizeByPowerOfTwo;
        this.mask = size - 1;
        this.POW = pow;
        this.data = (T[]) new Object[size << POW];
    }

    int id(int n) { return (n & mask) << POW; }

    public boolean push(T obj) {
        if (null == obj) throw new IllegalArgumentException("elem is null");
        int id = id(pwrite);
        if (null!=data[id]) return false;
        data[id] = obj; pwrite++;
        return true;
    }

    public T pop() {
        int id = id(pread);
        T rc = data[id];
        if (null == rc) return null;
        data[id] = null; pread++;
        return rc;
    }


    public static void test(int run, long count) throws Exception {
        // one might have to tweak the buffer size and data placement delta for target env
        final FFBuffer<Object> queue = new FFBuffer<Object>(15, 2);
        Object data = new Object();

        final long max = count;

        final CountDownLatch counter = new CountDownLatch(1);
        Thread consumer = new Thread(new Runnable() {

            public void run() {
                for (int i=0; i<max; i++)
                    while (null==queue.pop()) Thread.yield();

                counter.countDown();
            }
        });

        long start = System.nanoTime();
        consumer.start();

        for (int i=0; i<max; i++)
            while (!queue.push(data)) Thread.yield();

        counter.await();
        long end = System.nanoTime();

        long delta = end-start;
        System.out.format("run[%02d]: %,d ops in %,d ns (%,f ns per op) {%,d ops per second}\n", run, max, delta, (1.0*delta/max), (max*1000000000)/delta);
    }

    public static void main(String[] args) throws Exception {
        for (int i=0; i<25; i++)
            test(i, 1L<<30);
    }
}