Examples of java.util.concurrent.ThreadLocalRandom

java.util.concurrent.ThreadLocalRandom
A random number generator isolated to the current thread. Like the global {@link java.util.Random} generator used by the {@link java.lang.Math} class, a {@code ThreadLocalRandom} is initializedwith an internally generated seed that may not otherwise be modified. When applicable, use of {@code ThreadLocalRandom} ratherthan shared {@code Random} objects in concurrent programs willtypically encounter much less overhead and contention. Use of {@code ThreadLocalRandom} is particularly appropriate when multipletasks (for example, each a {@link ForkJoinTask}) use random numbers in parallel in thread pools.
Usages of this class should typically be of the form: {@code ThreadLocalRandom.current().nextX(...)} (where{@code X} is {@code Int}, {@code Long}, etc). When all usages are of this form, it is never possible to accidently share a {@code ThreadLocalRandom} across multiple threads.
This class also provides additional commonly used bounded random generation methods.
Instances of {@code ThreadLocalRandom} are not cryptographicallysecure. Consider instead using {@link java.security.SecureRandom}in security-sensitive applications. Additionally, default-constructed instances do not use a cryptographically random seed unless the {@linkplain System#getProperty system property}{@code java.util.secureRandomSeed} is set to {@code true}. @since 1.7 @author Doug Lea

    public SelectAction<?> getWinner() {
        return (SelectAction<?>) winner;
    }


    private static int[] randomIntArray(int n) {
        final ThreadLocalRandom random = ThreadLocalRandom.current();
        final int[] a = new int[n];
        for (int i = 1; i < n; i++) {
            int x = random.nextInt(i);
            a[i] = a[x];
            a[x] = i;
        }
        return a;
    }

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     */
    private Message awaitMatch(Node s, Node pred, Message e, boolean timed, long nanos) throws SuspendExecution {
        long lastTime = timed ? System.nanoTime() : 0L;
        Strand w = Strand.currentStrand();
        int spins = (w.isFiber() ? 0 : -1); // no spins in fiber; otherwise, initialized after first item and cancel checks
        ThreadLocalRandom randomYields = null; // bound if needed


        if (spins == 0)
            requestUnpark(s, w);


        for (;;) {
            Object item = s.item;


            if (item == CHANNEL_CLOSED)
                setReceiveClosed();


            if (item != e) {                  // matched
                // assert item != s;
                s.forgetContents();           // avoid garbage
                return this.<Message>cast(item);
            }
            if ((w.isInterrupted() || (timed && nanos <= 0))
                    && s.casItem(e, s)) {     // cancel
                unsplice(pred, s);
                return e;
            }


            if (spins < 0) {                  // establish spins at/near front
                if ((spins = spinsFor(pred, s.isData)) > 0)
                    randomYields = ThreadLocalRandom.current();
            } else if (spins > 0) {           // spin
                --spins;
                if (randomYields.nextInt(CHAINED_SPINS) == 0)
                    Strand.yield();           // occasionally yield
            } else if (s.waiter == null) {
                requestUnpark(s, w);          // request unpark then recheck
            } else if (timed) {
                long now = System.nanoTime();

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    public SelectAction<?> getWinner() {
        return (SelectAction<?>) winner;
    }


    private static int[] randomIntArray(int n) {
        final ThreadLocalRandom random = ThreadLocalRandom.current();
        final int[] a = new int[n];
        for (int i = 1; i < n; i++) {
            int x = random.nextInt(i);
            a[i] = a[x];
            a[x] = i;
        }
        return a;
    }

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