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

Example 51 with SplittableRandom

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

the class SplittableRandomTest method intsDataProvider.

@DataProvider(name = "ints")
public static Object[][] intsDataProvider() {
    List<Object[]> data = new ArrayList<>();
    // Function to create a stream using a RandomBoxedSpliterator
    Function<Function<SplittableRandom, Integer>, IntStream> rbsf = sf -> StreamSupport.stream(new RandomBoxedSpliterator<>(new SplittableRandom(), 0, SIZE, sf), false).mapToInt(i -> i);
    // Unbounded
    data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new SplittableRandom().ints().limit(%d)", SIZE), () -> new SplittableRandom().ints().limit(SIZE)), randomAsserter(SIZE, Integer.MAX_VALUE, 0) });
    data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new SplittableRandom().ints(%d)", SIZE), () -> new SplittableRandom().ints(SIZE)), randomAsserter(SIZE, Integer.MAX_VALUE, 0) });
    data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new RandomBoxedSpliterator(0, %d, sr -> sr.nextInt())", SIZE), () -> rbsf.apply(sr -> sr.nextInt())), randomAsserter(SIZE, Integer.MAX_VALUE, 0) });
    for (int b : BOUNDS) {
        for (int o : ORIGINS) {
            final int origin = o;
            final int bound = b;
            data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new SplittableRandom().ints(%d, %d).limit(%d)", origin, bound, SIZE), () -> new SplittableRandom().ints(origin, bound).limit(SIZE)), randomAsserter(SIZE, origin, bound) });
            data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new SplittableRandom().ints(%d, %d, %d)", SIZE, origin, bound), () -> new SplittableRandom().ints(SIZE, origin, bound)), randomAsserter(SIZE, origin, bound) });
            if (origin == 0) {
                data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new RandomBoxedSpliterator(0, %d, sr -> sr.nextInt(%d))", SIZE, bound), () -> rbsf.apply(sr -> sr.nextInt(bound))), randomAsserter(SIZE, origin, bound) });
            }
            data.add(new Object[] { TestData.Factory.ofIntSupplier(String.format("new RandomBoxedSpliterator(0, %d, sr -> sr.nextInt(%d, %d))", SIZE, origin, bound), () -> rbsf.apply(sr -> sr.nextInt(origin, bound))), randomAsserter(SIZE, origin, bound) });
        }
    }
    return data.toArray(new Object[0][]);
}

Example 52 with SplittableRandom

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

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(size, counter.sum());
}

Example 53 with SplittableRandom

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

the class SplittableRandomTest method testNextBytes.

/**
 * Repeated calls to nextBytes produce at least values of different signs for every byte
 */
public void testNextBytes() {
    SplittableRandom sr = new SplittableRandom();
    int n = sr.nextInt(1, 20);
    byte[] bytes = new byte[n];
    outer: for (int i = 0; i < n; i++) {
        for (int tries = NCALLS; tries-- > 0; ) {
            byte before = bytes[i];
            sr.nextBytes(bytes);
            byte after = bytes[i];
            if (after * before < 0)
                continue outer;
        }
        fail("not enough variation in random bytes");
    }
}

Example 54 with SplittableRandom

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

the class SplittableRandomTest method testNextLongBoundNonPositive.

/**
 * nextLong(non-positive) throws IllegalArgumentException
 */
public void testNextLongBoundNonPositive() {
    SplittableRandom sr = new SplittableRandom();
    Runnable[] throwingActions = { () -> sr.nextLong(-17L), () -> sr.nextLong(0L), () -> sr.nextLong(Long.MIN_VALUE) };
    assertThrows(IllegalArgumentException.class, throwingActions);
}

Example 55 with SplittableRandom

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

the class SplittableRandomTest method testUnsizedDoublesCountSeq.

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