Example usage for java.util.concurrent ThreadLocalRandom nextLong

Introduction

In this page you can find the example usage for java.util.concurrent ThreadLocalRandom nextLong.

Prototype

public long nextLong() 

Source Link

Document

Returns a pseudorandom long value.

Usage

From source file:fi.luontola.cqrshotel.JsonSerializationTest.java

private static Object randomValue(Class<?> type) {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    if (type == UUID.class) {
        return UUID.randomUUID();
    }/*from  w  w w . ja  v a  2  s .  c om*/
    if (type == LocalDate.class) {
        return LocalDate.of(random.nextInt(2000, 2100),
                random.nextInt(Month.JANUARY.getValue(), Month.DECEMBER.getValue() + 1),
                random.nextInt(1, Month.FEBRUARY.minLength() + 1));
    }
    if (type == Money.class) {
        return Money.of(random.nextDouble(0, 1000), pickRandom(Monetary.getCurrencies()));
    }
    if (type == Instant.class) {
        return Instant.ofEpochMilli(random.nextLong());
    }
    if (type == String.class) {
        return RandomStringUtils.randomAlphanumeric(random.nextInt(10));
    }
    if (type == int.class) {
        return random.nextInt();
    }
    throw new IllegalArgumentException("Unsupported type: " + type);
}

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From source file:org.neo4j.io.pagecache.PageCacheTest.java

@Test
public void mustSupportUnalignedWordAccesses() throws Exception {
    // 8 MB pages, 10 of them for 80 MB.
    // This way we are sure to write across OS page boundaries. The default
    // size of Huge Pages on Linux is 2 MB, but it can be configured to be
    // as large as 1 GB - at least I have not heard of anyone trying to
    // configure it to be more than that.
    int pageSize = 1024 * 1024 * 8;
    getPageCache(fs, 10, pageSize, PageCacheTracer.NULL);

    ThreadLocalRandom rng = ThreadLocalRandom.current();

    try (PagedFile pagedFile = pageCache.map(file("a"), filePageSize);
            PageCursor cursor = pagedFile.io(0, PF_SHARED_WRITE_LOCK)) {
        assertTrue(cursor.next());//from   w w w  . j a va  2 s. c o m

        for (int i = 0; i < pageSize - 8; i++) {
            cursor.setOffset(i);
            long x = rng.nextLong();
            cursor.putLong(x);
            cursor.setOffset(i);
            String reason = "Failed to read back the value that was written at " + "offset " + toHexString(i);
            assertThat(reason, toHexString(cursor.getLong()), is(toHexString(x)));
        }
    }
}

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