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

Example 36 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

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 37 with SplittableRandom

use of java.util.SplittableRandom in project jdk8u_jdk by JetBrains.

the class SplittableRandomTest method longsDataProvider.

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

Example 38 with SplittableRandom

use of java.util.SplittableRandom in project graal by oracle.

the class IdentityHashCodeSupport method generateHashCode.

protected static int generateHashCode() {
    SplittableRandom hashCodeGenerator = hashCodeGeneratorTL.get();
    if (hashCodeGenerator == null) {
        /*
             * Create a new thread-local random number generator. SplittableRandom ensures that
             * values created by different random number generator instances are random as a whole.
             */
        hashCodeGenerator = new SplittableRandom();
        hashCodeGeneratorTL.set(hashCodeGenerator);
    }
    int hashCode;
    do {
        hashCode = hashCodeGenerator.nextInt();
    } while (hashCode == 0);
    return hashCode;
}

Example 39 with SplittableRandom

use of java.util.SplittableRandom in project flink by apache.

the class S3RecoverableFsDataOutputStreamTest method createRandomLargeTestDataBuffers.

private static List<byte[]> createRandomLargeTestDataBuffers() {
    final List<byte[]> testData = new ArrayList<>();
    final SplittableRandom random = new SplittableRandom();
    long totalSize = 0L;
    int expectedSize = (int) random.nextLong(USER_DEFINED_MIN_PART_SIZE * 5L, USER_DEFINED_MIN_PART_SIZE * 100L);
    while (totalSize < expectedSize) {
        int len = random.nextInt(0, (int) (2L * USER_DEFINED_MIN_PART_SIZE));
        byte[] buffer = randomBuffer(random, len);
        totalSize += buffer.length;
        testData.add(buffer);
    }
    return testData;
}