Examples with SplittableRandom java.util.SplittableRandom used on opensource projects

Example 6 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method testNextIntBoundedNeg.

/**
     * nextInt(negative) throws IllegalArgumentException
     */
@Test(expectedExceptions = IllegalArgumentException.class)
public void testNextIntBoundedNeg() {
    SplittableRandom sr = new SplittableRandom();
    int f = sr.nextInt(-17);
}

Example 7 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method testIntsCount.

/**
     * A parallel sized stream of ints generates the given number of values
     */
public void testIntsCount() {
    LongAdder counter = new LongAdder();
    SplittableRandom r = new SplittableRandom();
    long size = 0;
    for (int reps = 0; reps < REPS; ++reps) {
        counter.reset();
        r.ints(size).parallel().forEach(x -> {
            counter.increment();
        });
        assertEquals(counter.sum(), size);
        size += 524959;
    }
}

Example 8 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method testBoundedDoubles.

/**
     * Each of a parallel sized stream of bounded doubles is within bounds
     */
public void testBoundedDoubles() {
    AtomicInteger fails = new AtomicInteger(0);
    SplittableRandom r = new SplittableRandom();
    long size = 456;
    for (double least = 0.00011; least < 1.0e20; least *= 9) {
        for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
            final double lo = least, hi = bound;
            r.doubles(size, lo, hi).parallel().forEach(x -> {
                if (x < lo || x >= hi)
                    fails.getAndIncrement();
            });
        }
    }
    assertEquals(fails.get(), 0);
}

Example 9 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method testSeedConstructor.

/**
     * Two SplittableRandoms created with the same seed produce the
     * same values for nextLong.
     */
public void testSeedConstructor() {
    for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863) {
        SplittableRandom sr1 = new SplittableRandom(seed);
        SplittableRandom sr2 = new SplittableRandom(seed);
        for (int i = 0; i < REPS; ++i) assertEquals(sr1.nextLong(), sr2.nextLong());
    }
}

Example 10 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method testSplit2.

/**
     * A SplittableRandom produced by split() of a seeded-constructed
     * SplittableRandom generates a different sequence
     */
public void testSplit2() {
    SplittableRandom sr = new SplittableRandom(12345);
    for (int reps = 0; reps < REPS; ++reps) {
        SplittableRandom sc = sr.split();
        int i = 0;
        while (i < NCALLS && sr.nextLong() == sc.nextLong()) ++i;
        assertTrue(i < NCALLS);
    }
}