Java Code Examples for java.util.concurrent.ThreadLocalRandom#nextBoolean()

private KeySpace createKeySpace(int level, int keyLen) {
	ThreadLocalRandom random = ThreadLocalRandom.current();
	KeySpace keySpace = new KeySpace();
	keySpace.level = level;
	keySpace.status = random.nextBoolean() ? NodeStatus.PUT : NodeStatus.REMOVE;
	keySpace.valuePointer = random.nextLong();
	keySpace.nextKeyPointer = random.nextLong();
	keySpace.nextIndexNodes = new long[level];
	keySpace.prevIndexNodes = new long[level];
	for (int i = 0; i < level; i++) {
		keySpace.nextIndexNodes[i] = random.nextLong();
		keySpace.prevIndexNodes[i] = random.nextLong();
	}
	keySpace.keyData = new byte[keyLen];
	random.nextBytes(keySpace.keyData);
	return keySpace;
}
 

Runnable newEliminationStackRunner() {
  final EliminationStack<Integer> stack = new EliminationStack<>();
  return new Runnable() {
    @Override public void run() {
      final ThreadLocalRandom random = ThreadLocalRandom.current();
      for (;;) {
        if (random.nextBoolean()) {
          stack.push(ELEMENT);
        } else {
          stack.pop();
        }
        calls.increment();
      }
    }
  };
}
 

/**
 * Concurrent Spliterators, once exhausted, stay exhausted.
 */
public void testStickySpliteratorExhaustion() throws Throwable {
    if (!impl.isConcurrent()) return;
    if (!testImplementationDetails) return;
    final ThreadLocalRandom rnd = ThreadLocalRandom.current();
    final Consumer alwaysThrows = e -> { throw new AssertionError(); };
    final Collection c = impl.emptyCollection();
    final Spliterator s = c.spliterator();
    if (rnd.nextBoolean()) {
        assertFalse(s.tryAdvance(alwaysThrows));
    } else {
        s.forEachRemaining(alwaysThrows);
    }
    final Object one = impl.makeElement(1);
    // Spliterator should not notice added element
    c.add(one);
    if (rnd.nextBoolean()) {
        assertFalse(s.tryAdvance(alwaysThrows));
    } else {
        s.forEachRemaining(alwaysThrows);
    }
}
 

/**
 * Check concurrent operations.
 *
 * @param done Done flag.
 * @param node Node.
 */
private static void checkConcurrentOperations(AtomicBoolean done, Ignite node) {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();

    boolean state = rnd.nextBoolean();

    while (!done.get()) {
        if (state)
            node.cluster().enableWal(CACHE_NAME);
        else
            node.cluster().disableWal(CACHE_NAME);

        state = !state;
    }

    try {
        Thread.sleep(rnd.nextLong(200, 1000));
    }
    catch (InterruptedException e) {
        throw new RuntimeException(e);
    }
}
 

/** {@inheritDoc} */
@Override public boolean test(Map<Object, Object> ctx) throws Exception {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();

    if (rnd.nextBoolean()) {
        double salary = rnd.nextDouble() * args.range() * 1000;

        double maxSalary = salary + 1000;

        Long res = (Long)cache().query(new SqlFieldsQuery("delete from Person where salary >= ? and salary <= ?")
            .setArgs(salary, maxSalary)).getAll().get(0).get(0);

        delItemsCnt.getAndAdd(res);

        delCnt.getAndIncrement();
    }
    else {
        int i = rnd.nextInt(args.range());

        cache.put(i, new Person(i, "firstName" + i, "lastName" + i, i * 1000));

        putCnt.getAndIncrement();
    }

    return true;
}
 

Runnable newLinkedTransferQueueRunner() {
  final TransferQueue<Integer> queue = new LinkedTransferQueue<>();
  return new Runnable() {
    @Override public void run() {
      final ThreadLocalRandom random = ThreadLocalRandom.current();
      for (;;) {
        if (random.nextBoolean()) {
          queue.offer(ELEMENT);
        } else {
          queue.poll();
        }
        calls.increment();
      }
    }
  };
}
 

/** {@inheritDoc} */
@Override public boolean test(Map<Object, Object> ctx) throws Exception {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();

    if (rnd.nextBoolean()) {
        double salary = rnd.nextDouble() * args.range() * 1000;

        double maxSalary = salary + 1000;

        Long res = (Long)cache().query(new SqlFieldsQuery("update Person set salary = (salary - ?1 + ?2) / 2 " +
                "where salary >= ?1 and salary <= ?2").setArgs(salary, maxSalary)).getAll().get(0).get(0);

        updItemsCnt.getAndAdd(res);

        updCnt.getAndIncrement();
    }
    else {
        int i = rnd.nextInt(args.range());

        cache.put(i, new Person(i, "firstName" + i, "lastName" + i, i * 1000));

        putCnt.getAndIncrement();
    }

    return true;
}
 

/** {@inheritDoc} */
@Override public boolean test(Map<Object, Object> ctx) throws Exception {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();

    IgniteCache<Integer, Object> cache = cacheForOperation(true);

    if (rnd.nextBoolean()) {
        double salary = rnd.nextDouble() * args.range() * 1000;

        double maxSalary = salary + 1000;

        Collection<Cache.Entry<Integer, Object>> entries = executeQuery(salary, maxSalary);

        for (Cache.Entry<Integer, Object> entry : entries) {
            Person p = (Person)entry.getValue();

            if (p.getSalary() < salary || p.getSalary() > maxSalary)
                throw new Exception("Invalid person retrieved [min=" + salary + ", max=" + maxSalary +
                        ", person=" + p + ']');
        }

        qryCnt.getAndIncrement();
    }
    else {
        int i = rnd.nextInt(args.range());

        cache.put(i, new Person(i, "firstName" + i, "lastName" + i, i * 1000));

        putCnt.getAndIncrement();
    }

    return true;
}
 

public static Booking newInstance() {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    int randInt = random.nextInt();
    Booking booking = new Booking();
    booking.firstname = "firstname" + randInt;
    booking.lastname = "lastname" + randInt;
    booking.totalprice = randInt;
    booking.depositpaid = random.nextBoolean();
    booking.bookingdates = BookingDates.newInstance();
    booking.additionalneeds = null;
    return booking;
}
 

/**
 * @return Random transaction type.
 */
protected TransactionConcurrency transactionConcurrency() {
    if (MvccFeatureChecker.forcedMvcc())
        return PESSIMISTIC;

    ThreadLocalRandom random = ThreadLocalRandom.current();

    return random.nextBoolean() ? OPTIMISTIC : PESSIMISTIC;
}
 

/** {@inheritDoc} */
@Override public boolean test(Map<Object, Object> ctx) throws Exception {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();

    if (rnd.nextBoolean()) {
        double salary = rnd.nextDouble() * args.range() * 1000;

        double maxSalary = salary + 1000;

        Collection<Cache.Entry<Integer, Object>> entries = executeQuery(salary, maxSalary);

        for (Cache.Entry<Integer, Object> entry : entries) {
            Object o = entry.getValue();

            double s = o instanceof Person ? ((Person) o).getSalary() : ((BinaryObject) o).<Double>field("salary");

            if (s < salary || s > maxSalary)
                throw new Exception("Invalid person retrieved [min=" + salary + ", max=" + maxSalary +
                        ", person=" + o + ']');
        }

        qryCnt.getAndIncrement();
    }
    else {
        int i = rnd.nextInt(args.range());

        cache.query(new SqlFieldsQuery("merge into Person(_key, id, firstName, lastName, salary) " +
            "values (?, ?, ?, ?, ?)").setArgs(i, i, "firstName" + i, "lastName" + i, (double) i * 1000));

        putCnt.getAndIncrement();
    }

    return true;
}
 

private Tuple3<Boolean, Long, Row> getDeleteTuple() {
	ThreadLocalRandom random = ThreadLocalRandom.current();
	long rowKey = random.nextLong();
	Row row = new Row(columnNames.getArity());
	for (int i = 0; i < columnNames.getArity(); i++) {
		if (random.nextBoolean()) {
			row.setField(i, true);
		}
	}
	return Tuple3.of(false, rowKey, row);
}
 

private int randomColor() {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    double rand = random.nextDouble(1, 100);

    if (rand <= 0.164) {
        return DyeColor.PINK.getWoolData();
    }

    if (rand <= 15) {
        return random.nextBoolean() ? DyeColor.BLACK.getWoolData() : random.nextBoolean() ? DyeColor.GRAY.getWoolData() : DyeColor.LIGHT_GRAY.getWoolData();
    }

    return DyeColor.WHITE.getWoolData();
}
 

private int randomColor() {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    double rand = random.nextDouble(1, 100);

    if (rand <= 0.164) {
        return DyeColor.PINK.getWoolData();
    }

    if (rand <= 15) {
        return random.nextBoolean() ? DyeColor.BLACK.getWoolData() : random.nextBoolean() ? DyeColor.GRAY.getWoolData() : DyeColor.LIGHT_GRAY.getWoolData();
    }

    return DyeColor.WHITE.getWoolData();
}
 

private String randomCase(String message) {
  char[] messageArray = message.toCharArray();
  ThreadLocalRandom rand = ThreadLocalRandom.current();
  
  for (int i = 0; i < messageArray.length; i++) {
    if (rand.nextBoolean()) {
      messageArray[i] = Character.toUpperCase(messageArray[i]);
    } else {
      messageArray[i] = Character.toLowerCase(messageArray[i]);
    }
  }
  return new String(messageArray);
}
 

private static void reverseImage(BufferedImage bufferedImg) {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    if (random.nextBoolean()) {
        int rgb;
        for (int i=0; i<IMG_WIDTH; ++i) {
            for (int j=0; j<IMG_HEIGHT; ++j) {
                rgb = bufferedImg.getRGB(i, j);
                bufferedImg.setRGB(i, j, 0xFFFFFF - rgb);
            }
        }
    }
}
 

/**
 * @throws Exception If failed.
 */
@Test
public void testRecoveryRandomPutRemove() throws Exception {
    try {
        pageSize = 1024;

        extraCcfg = new CacheConfiguration(CACHE2_NAME);
        extraCcfg.setAffinity(new RendezvousAffinityFunction(false, PARTS));

        Ignite ignite = startGrid(0);

        ignite.cluster().active(true);

        GridCacheDatabaseSharedManager dbMgr = (GridCacheDatabaseSharedManager)((IgniteEx)ignite).context()
            .cache().context().database();

        dbMgr.enableCheckpoints(false).get();

        IgniteCache<Integer, IndexedValue> cache1 = ignite.cache(CACHE_NAME);
        IgniteCache<Object, Object> cache2 = ignite.cache(CACHE2_NAME);

        final int KEYS1 = 100;

        for (int i = 0; i < KEYS1; i++)
            cache1.put(i, new IndexedValue(i));

        for (int i = 0; i < KEYS1; i++) {
            if (i % 2 == 0)
                cache1.remove(i);
        }

        ThreadLocalRandom rnd = ThreadLocalRandom.current();

        for (int i = 0; i < KEYS1; i++) {
            cache2.put(i, new byte[rnd.nextInt(512)]);

            if (rnd.nextBoolean())
                cache2.put(i, new byte[rnd.nextInt(512)]);

            if (rnd.nextBoolean())
                cache2.remove(i);
        }

        ignite.close();

        ignite = startGrid(0);

        ignite.cluster().active(true);

        ignite.cache(CACHE_NAME).put(1, new IndexedValue(0));
    }
    finally {
        stopAllGrids();
    }
}
 

/**
 * @throws Exception If failed.
 */
@Test
public void testFreeListRecovery() throws Exception {
    try {
        pageSize = 1024;
        extraCcfg = new CacheConfiguration(CACHE2_NAME);

        Ignite ignite = startGrid(0);

        ignite.cluster().active(true);

        IgniteCache<Integer, IndexedValue> cache1 = ignite.cache(CACHE_NAME);
        IgniteCache<Object, Object> cache2 = ignite.cache(CACHE2_NAME);

        final int KEYS1 = 2048;

        for (int i = 0; i < KEYS1; i++)
            cache1.put(i, new IndexedValue(i));

        for (int i = 0; i < KEYS1; i++) {
            if (i % 2 == 0)
                cache1.remove(i);
        }

        ThreadLocalRandom rnd = ThreadLocalRandom.current();

        for (int i = 0; i < KEYS1; i++) {
            cache2.put(i, new byte[rnd.nextInt(512)]);

            if (rnd.nextBoolean())
                cache2.put(i, new byte[rnd.nextInt(512)]);

            if (rnd.nextBoolean())
                cache2.remove(i);
        }

        Map<Integer, T2<Map<Integer, long[]>, int[]>> cache1_1 = getFreeListData(ignite, CACHE_NAME);
        Map<Integer, T2<Map<Integer, long[]>, int[]>> cache2_1 = getFreeListData(ignite, CACHE2_NAME);
        T2<long[], Integer> rl1_1 = getReuseListData(ignite, CACHE_NAME);
        T2<long[], Integer> rl2_1 = getReuseListData(ignite, CACHE2_NAME);

        ignite.close();

        ignite = startGrid(0);

        ignite.cluster().active(true);

        cache1 = ignite.cache(CACHE_NAME);
        cache2 = ignite.cache(CACHE2_NAME);

        for (int i = 0; i < KEYS1; i++) {
            cache1.get(i);
            cache2.get(i);
        }

        Map<Integer, T2<Map<Integer, long[]>, int[]>> cache1_2 = getFreeListData(ignite, CACHE_NAME);
        Map<Integer, T2<Map<Integer, long[]>, int[]>> cache2_2 = getFreeListData(ignite, CACHE2_NAME);
        T2<long[], Integer> rl1_2 = getReuseListData(ignite, CACHE_NAME);
        T2<long[], Integer> rl2_2 = getReuseListData(ignite, CACHE2_NAME);

        checkEquals(cache1_1, cache1_2);
        checkEquals(cache2_1, cache2_2);
        checkEquals(rl1_1, rl1_2);
        checkEquals(rl2_1, rl2_2);
    }
    finally {
        stopAllGrids();
    }
}
 

/**
 * Returns a new deque of given size containing consecutive
 * Integers 0 ... n - 1.
 */
private static ArrayDeque<Integer> populatedDeque(int n) {
    // Randomize various aspects of memory layout, including
    // capacity slop and wraparound.
    final ArrayDeque<Integer> q;
    ThreadLocalRandom rnd = ThreadLocalRandom.current();
    switch (rnd.nextInt(6)) {
    case 0: q = new ArrayDeque<Integer>();      break;
    case 1: q = new ArrayDeque<Integer>(0);     break;
    case 2: q = new ArrayDeque<Integer>(1);     break;
    case 3: q = new ArrayDeque<Integer>(Math.max(0, n - 1)); break;
    case 4: q = new ArrayDeque<Integer>(n);     break;
    case 5: q = new ArrayDeque<Integer>(n + 1); break;
    default: throw new AssertionError();
    }
    switch (rnd.nextInt(3)) {
    case 0:
        q.addFirst(42);
        assertEquals((Integer) 42, q.removeLast());
        break;
    case 1:
        q.addLast(42);
        assertEquals((Integer) 42, q.removeFirst());
        break;
    case 2: /* do nothing */ break;
    default: throw new AssertionError();
    }
    assertTrue(q.isEmpty());
    if (rnd.nextBoolean())
        for (int i = 0; i < n; i++)
            assertTrue(q.offerLast((Integer) i));
    else
        for (int i = n; --i >= 0; )
            q.addFirst((Integer) i);
    assertEquals(n, q.size());
    if (n > 0) {
        assertFalse(q.isEmpty());
        assertEquals((Integer) 0, q.peekFirst());
        assertEquals((Integer) (n - 1), q.peekLast());
    }
    return q;
}
 

public static void main(String[] args) throws Exception
{
    ThreadLocalRandom random = ThreadLocalRandom.current();
    try (TestingServer server = new TestingServer())
    {
        try (CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new ExponentialBackoffRetry(1000, 3)))
        {
            client.start();
            try (CuratorCache cache = CuratorCache.build(client, PATH))
            {
                // there are several ways to set a listener on a CuratorCache. You can watch for individual events
                // or for all events. Here, we'll use the builder to log individual cache actions
                CuratorCacheListener listener = CuratorCacheListener.builder()
                    .forCreates(node -> System.out.println(String.format("Node created: [%s]", node)))
                    .forChanges((oldNode, node) -> System.out.println(String.format("Node changed. Old: [%s] New: [%s]", oldNode, node)))
                    .forDeletes(oldNode -> System.out.println(String.format("Node deleted. Old value: [%s]", oldNode)))
                    .forInitialized(() -> System.out.println("Cache initialized"))
                    .build();

                // register the listener
                cache.listenable().addListener(listener);

                // the cache must be started
                cache.start();

                // now randomly create/change/delete nodes
                for ( int i = 0; i < 1000; ++i )
                {
                    int depth = random.nextInt(1, 4);
                    String path = makeRandomPath(random, depth);
                    if ( random.nextBoolean() )
                    {
                        client.create().orSetData().creatingParentsIfNeeded().forPath(path, Long.toString(random.nextLong()).getBytes());
                    }
                    else
                    {
                        client.delete().quietly().deletingChildrenIfNeeded().forPath(path);
                    }

                    Thread.sleep(5);
                }
            }
        }
    }
}