Examples with ThreadLocalRandom java8.util.concurrent.ThreadLocalRandom used on opensource projects

Example 46 with ThreadLocalRandom

use of java8.util.concurrent.ThreadLocalRandom in project streamsupport by stefan-zobel.

the class ThreadLocalRandom8Test method testUnsizedLongsCountSeq.

/**
 * A sequential unsized stream of longs generates at least 100 values
 */
public void testUnsizedLongsCountSeq() {
    LongAdder counter = new LongAdder();
    ThreadLocalRandom r = ThreadLocalRandom.current();
    long size = 100;
    r.longs().limit(size).forEach(x -> counter.increment());
    assertEquals(size, counter.sum());
}

Example 47 with ThreadLocalRandom

use of java8.util.concurrent.ThreadLocalRandom in project streamsupport by stefan-zobel.

the class ThreadLocalRandomTest method testDifferentSequences.

/**
 * Different threads produce different pseudo-random sequences
 */
public void testDifferentSequences() {
    // Don't use main thread's ThreadLocalRandom - it is likely to
    // be polluted by previous tests.
    final AtomicReference<ThreadLocalRandom> threadLocalRandom = new AtomicReference<>();
    final AtomicLong rand = new AtomicLong();
    long firstRand = 0;
    Runnable getRandomState = new CheckedRunnable() {

        public void realRun() {
            ThreadLocalRandom current = ThreadLocalRandom.current();
            assertSame(current, ThreadLocalRandom.current());
            // test bug: the following is not guaranteed and not true in JDK8
            // assertNotSame(current, threadLocalRandom.get());
            rand.set(current.nextLong());
            threadLocalRandom.set(current);
        }
    };
    Thread first = newStartedThread(getRandomState);
    awaitTermination(first);
    firstRand = rand.get();
    @SuppressWarnings("unused") ThreadLocalRandom firstThreadLocalRandom = threadLocalRandom.get();
    for (int i = 0; i < NCALLS; i++) {
        Thread t = newStartedThread(getRandomState);
        awaitTermination(t);
        if (firstRand != rand.get())
            return;
    }
    fail("all threads generate the same pseudo-random sequence");
}

Example 48 with ThreadLocalRandom

use of java8.util.concurrent.ThreadLocalRandom in project streamsupport by stefan-zobel.

the class ThreadLocalRandomTest method testNextIntBoundNonPositive.

/**
 * nextInt(non-positive) throws IllegalArgumentException
 */
public void testNextIntBoundNonPositive() {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();
    for (int bound : new int[] { 0, -17, Integer.MIN_VALUE }) {
        try {
            rnd.nextInt(bound);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }
}