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

Example 21 with SplittableRandom

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

the class SplittableRandomTest method testNextIntBounded.

/**
     * nextInt(bound) returns 0 <= value < bound;
     * repeated calls produce at least two distinct results
     */
public void testNextIntBounded() {
    SplittableRandom sr = new SplittableRandom();
    // sample bound space across prime number increments
    for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) {
        int f = sr.nextInt(bound);
        assertTrue(0 <= f && f < bound);
        int i = 0;
        int j;
        while (i < NCALLS && (j = sr.nextInt(bound)) == f) {
            assertTrue(0 <= j && j < bound);
            ++i;
        }
        assertTrue(i < NCALLS);
    }
}

Example 22 with SplittableRandom

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

the class SplittableRandomTest method testBoundedLongs.

/**
     * Each of a parallel sized stream of bounded longs is within bounds
     */
public void testBoundedLongs() {
    AtomicInteger fails = new AtomicInteger(0);
    SplittableRandom r = new SplittableRandom();
    long size = 123L;
    for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
        for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
            final long lo = least, hi = bound;
            r.longs(size, lo, hi).parallel().forEach(x -> {
                if (x < lo || x >= hi)
                    fails.getAndIncrement();
            });
        }
    }
    assertEquals(fails.get(), 0);
}

Example 23 with SplittableRandom

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

the class SplittableRandomTest method testNextDoubleBounded2.

/**
     * nextDouble(least, bound) returns least <= value < bound;
     * repeated calls produce at least two distinct results
     */
public void testNextDoubleBounded2() {
    SplittableRandom sr = new SplittableRandom();
    for (double least = 0.0001; least < 1.0e20; least *= 8) {
        for (double bound = least * 1.001; bound < 1.0e20; bound *= 16) {
            double f = sr.nextDouble(least, bound);
            assertTrue(least <= f && f < bound);
            int i = 0;
            double j;
            while (i < NCALLS && (j = sr.nextDouble(least, bound)) == f) {
                assertTrue(least <= j && j < bound);
                ++i;
            }
            assertTrue(i < NCALLS);
        }
    }
}

Example 24 with SplittableRandom

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

the class SplittableRandomTest method testUnsizedDoublesCount.

/**
     * A parallel unsized stream of doubles generates at least 100 values
     */
public void testUnsizedDoublesCount() {
    LongAdder counter = new LongAdder();
    SplittableRandom r = new SplittableRandom();
    long size = 100;
    r.doubles().limit(size).parallel().forEach(x -> {
        counter.increment();
    });
    assertEquals(counter.sum(), size);
}

Example 25 with SplittableRandom

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

the class SplittableRandomTest method testUnsizedIntsCount.

/**
     * A parallel unsized stream of ints generates at least 100 values
     */
public void testUnsizedIntsCount() {
    LongAdder counter = new LongAdder();
    SplittableRandom r = new SplittableRandom();
    long size = 100;
    r.ints().limit(size).parallel().forEach(x -> {
        counter.increment();
    });
    assertEquals(counter.sum(), size);
}