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

Example 21 with SplittableRandom

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

the class SplittableRandomTest method testDoublesCount.

/**
 * A parallel sized stream of doubles generates the given number of values
 */
public void testDoublesCount() {
    final LongAdder counter = new LongAdder();
    SplittableRandom r = new SplittableRandom();
    long size = 0;
    for (int reps = 0; reps < REPS; ++reps) {
        counter.reset();
        r.doubles(size).parallel().forEach(new DoubleConsumer() {

            @Override
            public void accept(double x) {
                counter.increment();
            }
        });
        assertEquals(counter.sum(), size);
        size += 524959;
    }
}

Example 22 with SplittableRandom

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

the class SplittableRandomTest method testLongsCount.

/**
 * A parallel sized stream of longs generates the given number of values
 */
public void testLongsCount() {
    final LongAdder counter = new LongAdder();
    SplittableRandom r = new SplittableRandom();
    long size = 0;
    for (int reps = 0; reps < REPS; ++reps) {
        counter.reset();
        r.longs(size).parallel().forEach(new LongConsumer() {

            @Override
            public void accept(long x) {
                counter.increment();
            }
        });
        assertEquals(counter.sum(), size);
        size += 524959;
    }
}

Example 23 with SplittableRandom

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

the class SplittableRandomTest method testNextIntBounded2.

/**
 * nextInt(least, bound) returns least <= value < bound;
 * repeated calls produce at least two distinct results
 */
public void testNextIntBounded2() {
    SplittableRandom sr = new SplittableRandom();
    for (int least = -15485863; least < MAX_INT_BOUND; least += 524959) {
        for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 49979687) {
            int f = sr.nextInt(least, bound);
            assertTrue(least <= f && f < bound);
            int i = 0;
            int j;
            while (i < NCALLS && (j = sr.nextInt(least, bound)) == f) {
                assertTrue(least <= j && j < bound);
                ++i;
            }
            assertTrue(i < NCALLS);
        }
    }
}

Example 24 with SplittableRandom

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

the class SplittableRandomTest method testNextLongBadBounds.

/**
 * nextLong(least >= bound) throws IllegalArgumentException
 */
@Test(expectedExceptions = IllegalArgumentException.class)
public void testNextLongBadBounds() {
    SplittableRandom sr = new SplittableRandom();
    long f = sr.nextLong(17, 2);
}

Example 25 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() {
    final 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(new DoubleConsumer() {

                @Override
                public void accept(double x) {
                    if (x < lo || x >= hi)
                        fails.getAndIncrement();
                }
            });
        }
    }
    assertEquals(fails.get(), 0);
}