Examples with SplittableRandom java8.util.SplittableRandom used on opensource projects

Example 1 with SplittableRandom

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

the class SplittableRandomTest method testNextDoubleBoundNonPositive.

/**
 * nextDouble(non-positive) throws IllegalArgumentException
 */
public void testNextDoubleBoundNonPositive() {
    SplittableRandom sr = new SplittableRandom();
    Runnable[] throwingActions = { () -> sr.nextDouble(-17.0d), () -> sr.nextDouble(0.0d), () -> sr.nextDouble(-Double.MIN_VALUE), () -> sr.nextDouble(Double.NEGATIVE_INFINITY), () -> sr.nextDouble(Double.NaN) };
    assertThrows(IllegalArgumentException.class, throwingActions);
}

Example 2 with SplittableRandom

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

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 3 with SplittableRandom

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

the class SplittableRandomTest method testNextLongBounded2.

/**
 * nextLong(least, bound) returns least <= value < bound;
 * repeated calls produce at least two distinct results
 */
public void testNextLongBounded2() {
    SplittableRandom sr = new SplittableRandom();
    for (long least = -86028121; least < MAX_LONG_BOUND; least += 982451653L) {
        for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
            long f = sr.nextLong(least, bound);
            assertTrue(least <= f && f < bound);
            int i = 0;
            long j;
            while (i < NCALLS && (j = sr.nextLong(least, bound)) == f) {
                assertTrue(least <= j && j < bound);
                ++i;
            }
            assertTrue(i < NCALLS);
        }
    }
}

Example 4 with SplittableRandom

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

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(size, counter.sum());
        size += 524959;
    }
}

Example 5 with SplittableRandom

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

the class SplittableRandomTest method testUnsizedLongsCountSeq.

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