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

Example 26 with SplittableRandom

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

the class SplittableRandomTest method testLongsCount.

/**
     * A parallel sized stream of longs generates the given number of values
     */
public void testLongsCount() {
    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(x -> {
            counter.increment();
        });
        assertEquals(counter.sum(), size);
        size += 524959;
    }
}

Example 27 with SplittableRandom

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

the class SplittableRandomTest method testBadStreamSize.

/**
     * Invoking sized ints, long, doubles, with negative sizes throws
     * IllegalArgumentException
     */
public void testBadStreamSize() {
    SplittableRandom r = new SplittableRandom();
    executeAndCatchIAE(() -> r.ints(-1L));
    executeAndCatchIAE(() -> r.ints(-1L, 2, 3));
    executeAndCatchIAE(() -> r.longs(-1L));
    executeAndCatchIAE(() -> r.longs(-1L, -1L, 1L));
    executeAndCatchIAE(() -> r.doubles(-1L));
    executeAndCatchIAE(() -> r.doubles(-1L, .5, .6));
}

Example 28 with SplittableRandom

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

the class SplittableRandomTest method testNextLongBounded.

/**
     * nextLong(bound) returns 0 <= value < bound;
     * repeated calls produce at least two distinct results
     */
public void testNextLongBounded() {
    SplittableRandom sr = new SplittableRandom();
    for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) {
        long f = sr.nextLong(bound);
        assertTrue(0 <= f && f < bound);
        int i = 0;
        long j;
        while (i < NCALLS && (j = sr.nextLong(bound)) == f) {
            assertTrue(0 <= j && j < bound);
            ++i;
        }
        assertTrue(i < NCALLS);
    }
}

Example 29 with SplittableRandom

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

the class SplittableRandomTest method testNextDoubleBadBound.

/**
     * nextDouble(bound) throws IllegalArgumentException
     */
public void testNextDoubleBadBound() {
    SplittableRandom sr = new SplittableRandom();
    executeAndCatchIAE(() -> sr.nextDouble(0.0));
    executeAndCatchIAE(() -> sr.nextDouble(-0.0));
    executeAndCatchIAE(() -> sr.nextDouble(+0.0));
    executeAndCatchIAE(() -> sr.nextDouble(-1.0));
    executeAndCatchIAE(() -> sr.nextDouble(Double.NaN));
    executeAndCatchIAE(() -> sr.nextDouble(Double.NEGATIVE_INFINITY));
// Returns Double.MAX_VALUE
//        executeAndCatchIAE(() -> r.nextDouble(Double.POSITIVE_INFINITY));
}

Example 30 with SplittableRandom

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

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(counter.sum(), size);
}