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

Example 61 with SplittableRandom

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

the class SplittableRandomTest method testBadStreamSize.

/**
 * Invoking sized ints, long, doubles, with negative sizes throws
 * IllegalArgumentException
 */
@SuppressWarnings("unused")
public void testBadStreamSize() {
    SplittableRandom r = new SplittableRandom();
    Runnable[] throwingActions = { () -> {
        java8.util.stream.IntStream x = r.ints(-1L);
    }, () -> {
        java8.util.stream.IntStream x = r.ints(-1L, 2, 3);
    }, () -> {
        java8.util.stream.LongStream x = r.longs(-1L);
    }, () -> {
        java8.util.stream.LongStream x = r.longs(-1L, -1L, 1L);
    }, () -> {
        java8.util.stream.DoubleStream x = r.doubles(-1L);
    }, () -> {
        java8.util.stream.DoubleStream x = r.doubles(-1L, .5, .6);
    } };
    assertThrows(IllegalArgumentException.class, throwingActions);
}

Example 62 with SplittableRandom

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

the class SplittableRandomTest method testNextIntBadBounds.

/**
 * nextInt(least >= bound) throws IllegalArgumentException
 */
public void testNextIntBadBounds() {
    SplittableRandom sr = new SplittableRandom();
    Runnable[] throwingActions = { () -> sr.nextInt(17, 2), () -> sr.nextInt(-42, -42), () -> sr.nextInt(Integer.MAX_VALUE, Integer.MIN_VALUE) };
    assertThrows(IllegalArgumentException.class, throwingActions);
}

Example 63 with SplittableRandom

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

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(size, counter.sum());
}

Example 64 with SplittableRandom

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

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);
    }
}

Example 65 with SplittableRandom

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

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(0, fails.get());
}