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

Example 56 with SplittableRandom

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

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(0, fails.get());
}

Example 57 with SplittableRandom

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

the class SplittableRandomTest method testBoundedInts.

/**
 * Each of a parallel sized stream of bounded ints is within bounds
 */
public void testBoundedInts() {
    AtomicInteger fails = new AtomicInteger(0);
    SplittableRandom r = new SplittableRandom();
    long size = 12345L;
    for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
        for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
            final int lo = least, hi = bound;
            r.ints(size, lo, hi).parallel().forEach(x -> {
                if (x < lo || x >= hi)
                    fails.getAndIncrement();
            });
        }
    }
    assertEquals(0, fails.get());
}

Example 58 with SplittableRandom

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

the class SplittableRandomTest method testNextDoubleBadBounds.

/**
 * nextDouble(! (least < bound)) throws IllegalArgumentException
 */
public void testNextDoubleBadBounds() {
    SplittableRandom sr = new SplittableRandom();
    Runnable[] throwingActions = { () -> sr.nextDouble(17.0d, 2.0d), () -> sr.nextDouble(-42.0d, -42.0d), () -> sr.nextDouble(Double.MAX_VALUE, Double.MIN_VALUE), () -> sr.nextDouble(Double.NaN, 0.0d), () -> sr.nextDouble(0.0d, Double.NaN) };
    assertThrows(IllegalArgumentException.class, throwingActions);
}

Example 59 with SplittableRandom

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

the class SplittableRandomTest method testUnsizedLongsCount.

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

Example 60 with SplittableRandom

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

the class SplittableRandomTest method testSplit1.

/**
 * A SplittableRandom produced by split() of a default-constructed
 * SplittableRandom generates a different sequence
 */
public void testSplit1() {
    SplittableRandom sr = new SplittableRandom();
    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);
    }
}