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

public void run(SourceContext<MonitoringEvent> sourceContext) throws Exception {
    while (running) {
        MonitoringEvent monitoringEvent;

        final ThreadLocalRandom random = ThreadLocalRandom.current();

        if (shard > 0) {
            int rackId = random.nextInt(shard) + offset;

            if (random.nextDouble() >= temperatureRatio) {
                double power = random.nextGaussian() * powerStd + powerMean;
                monitoringEvent = new PowerEvent(rackId, power);
            } else {
                double temperature = random.nextGaussian() * temperatureStd + temperatureMean;
                monitoringEvent = new TemperatureEvent(rackId, temperature);
            }


            sourceContext.collect(monitoringEvent);
        }

        Thread.sleep(pause);
    }
}
 

/**
 * nextDouble(non-positive) throws IllegalArgumentException
 */
public void testNextDoubleBoundNonPositive() {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();
    double[] badBounds = {
        0.0d,
        -17.0d,
        -Double.MIN_VALUE,
        Double.NEGATIVE_INFINITY,
        Double.NaN,
    };
    for (double bound : badBounds) {
        try {
            rnd.nextDouble(bound);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }
}
 

/**
 * @param buf Buffer.
 * @param track Track.
 * @param basePageId Base page id.
 * @param maxPageId Max page id.
 * @param setIdx Set index.
 * @param backupId Backup id.
 * @param successfulBackupId Successful backup id.
 */
private void generateMarking(
    ByteBuffer buf,
    int track,
    long basePageId,
    long maxPageId,
    Set<Long> setIdx,
    int backupId, int successfulBackupId
) {
    ThreadLocalRandom rand = ThreadLocalRandom.current();

    for (long i = basePageId; i < basePageId + track; i++) {
        boolean changed = (i == basePageId || rand.nextDouble() < 0.1) && i < maxPageId;

        if (changed) {
            io.markChanged(buf, i, backupId, successfulBackupId, PAGE_SIZE);

            setIdx.add(i);
        }
    }
}
 

/** {@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;
}
 

/**
 * Generate some random tuples
 * @return
 */
public static List<SpatialIndexEntry> generateRandomTupleList(final int dimensions, final int elements) {
	final List<SpatialIndexEntry> entryList = new ArrayList<>();
	final ThreadLocalRandom random = ThreadLocalRandom.current();
	
	for(int i = 0; i < elements; i++) {
		final double[] boundingBoxData = new double[dimensions * 2];
		
		for(int d = 0; d < dimensions; d++) {
			final double begin = random.nextDouble(-10000, 10000);
			final double extent = random.nextDouble(0, 50);
			boundingBoxData[2 * d] = begin;            // Start coordinate
			boundingBoxData[2 * d + 1] = begin+extent; // End coordinate
		}
		
		final Hyperrectangle bbox = new Hyperrectangle(boundingBoxData);
		final SpatialIndexEntry entry = new SpatialIndexEntry(bbox, i);
		entryList.add(entry);
	}

	return entryList;
}
 

@Setup
public void setup()
{
    List<Type> types = ImmutableList.copyOf(limit(cycle(BIGINT), FIELDS_COUNT));
    ThreadLocalRandom random = ThreadLocalRandom.current();
    PageBuilder pageBuilder = new PageBuilder(types);
    while (!pageBuilder.isFull()) {
        pageBuilder.declarePosition();
        for (int channel = 0; channel < FIELDS_COUNT; channel++) {
            BlockBuilder blockBuilder = pageBuilder.getBlockBuilder(channel);
            if (random.nextDouble() < NULLS_FRACTION) {
                blockBuilder.appendNull();
            }
            else {
                BIGINT.writeLong(blockBuilder, random.nextLong());
            }
        }
    }
    page = pageBuilder.build();
}
 

/**
 * nextDouble(non-positive) throws IllegalArgumentException
 */
public void testNextDoubleBoundNonPositive() {
    ThreadLocalRandom rnd = ThreadLocalRandom.current();
    double[] badBounds = {
        0.0d,
        -17.0d,
        -Double.MIN_VALUE,
        Double.NEGATIVE_INFINITY,
        Double.NaN,
    };
    for (double bound : badBounds) {
        try {
            rnd.nextDouble(bound);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }
}
 

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();
}
 

/** {@inheritDoc} */
@Override
protected double[] createProbabilities() {
    final double[] probabilities = new double[randomNonUniformSize];
    final ThreadLocalRandom rng = ThreadLocalRandom.current();
    for (int i = 0; i < probabilities.length; i++) {
        probabilities[i] = rng.nextDouble();
    }
    return probabilities;
}
 

private static Message buildMessage(TxSendConfig config) {
    byte[] bs = new byte[config.messageSize];
    ThreadLocalRandom r = ThreadLocalRandom.current();
    r.nextBytes(bs);

    ByteBuffer buf = ByteBuffer.wrap(bs);
    buf.putLong(config.batchId);
    long sendMachineId = START_TIME << 32;
    long msgId = sendMachineId | MSG_COUNT.getAndIncrement();
    buf.putLong(msgId);

    // save send tx result in message
    if (r.nextDouble() < config.sendRollbackRate) {
        buf.put((byte) LocalTransactionState.ROLLBACK_MESSAGE.ordinal());
    } else if (r.nextDouble() < config.sendUnknownRate) {
        buf.put((byte) LocalTransactionState.UNKNOW.ordinal());
    } else {
        buf.put((byte) LocalTransactionState.COMMIT_MESSAGE.ordinal());
    }

    // save check tx result in message
    for (int i = 0; i < MAX_CHECK_RESULT_IN_MSG; i++) {
        if (r.nextDouble() < config.checkRollbackRate) {
            buf.put((byte) LocalTransactionState.ROLLBACK_MESSAGE.ordinal());
        } else if (r.nextDouble() < config.checkUnknownRate) {
            buf.put((byte) LocalTransactionState.UNKNOW.ordinal());
        } else {
            buf.put((byte) LocalTransactionState.COMMIT_MESSAGE.ordinal());
        }
    }

    Message msg = new Message();
    msg.setTopic(config.topic);

    msg.setBody(bs);
    return msg;
}
 

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

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

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

    return DyeColor.WHITE.getDyedData();
}
 

private String makeWave(String message) {
  char[] messageArray = message.toCharArray();
  ThreadLocalRandom rand = ThreadLocalRandom.current();
  double span = rand.nextDouble(0.4D, 1.3D);
  double xoff = rand.nextDouble(0, 32);
  double yoff = rand.nextDouble(-0.4, 0.6);
  
  for (int i = 0; i < messageArray.length; i++) {
    if (waveCharIsUpper(i, span, xoff, yoff)) {
      messageArray[i] = Character.toUpperCase(messageArray[i]);
    }
  }
  return new String(messageArray);
}
 

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();
}
 

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

    if (cfg.memberId() % 2 == 0) {
        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 + ']');
        }
    }
    else {
        IgniteCache<Integer, Object> cache = cacheForOperation(true);

        int i = rnd.nextInt(args.range());

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

    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;
}
 

/** {@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;
}
 

@Override
public void initializeScan(final long stepTime, final int numSteps) {
	final ThreadLocalRandom random = ThreadLocalRandom.current();
	testData = new double[numSteps];
	for (int i = 0; i < testData.length; i++) {
		testData[i] = random.nextDouble(0, Double.MAX_VALUE);
	}

	super.initializeScan(stepTime, numSteps);
}
 

public static void buildLightning(Location start, Vector direction, int entries, int branches, double radius, double offset, double offsetRate, double length, double lengthRate, double branch, double branchRate, Consumer<Location> action) {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    if (entries <= 0) {
        return;
    }
    boolean inRange = true;
    while (random.nextDouble() < branch || inRange) {
        Vector randomizer = new Vector(random.nextDouble(-radius, radius), random.nextDouble(-radius, radius), random.nextDouble(-radius, radius)).normalize().multiply((random.nextDouble(-radius, radius)) * offset);
        Vector endVector = start.clone().toVector().add(direction.clone().multiply(length)).add(randomizer);
        Location end = endVector.toLocation(start.getWorld());
        if (end.distance(start) <= length) {
            inRange = true;
            continue;
        } else {
            inRange = false;
        }
        int rate = (int) (start.distance(end) / 0.1); // distance * (distance / 10)
        Vector rateDir = endVector.clone().subtract(start.toVector()).normalize().multiply(0.1);
        for (int i = 0; i < rate; i++) {
            Location loc = start.clone().add(rateDir.clone().multiply(i));
            action.accept(loc);
        }
        buildLightning(end.clone(), direction, entries - 1, branches - 1, radius, offset * offsetRate, offsetRate, length * lengthRate, lengthRate, branch * branchRate, branchRate, action);
        if (branches <= 0) {
            break;
        }
    }
}
 

private AnimationPoint generateRandom(EntityPlayer player) {
    ThreadLocalRandom current = ThreadLocalRandom.current();
    double posX = player == null ? 0 : player.posX;
    double posY = player == null ? 0 : player.posY;
    double posZ = player == null ? 0 : player.posZ;
    double y = current.nextDouble(.5 + posY, posY + BOUNDS + (double) BOUNDS / 2D);
    return new AnimationPoint(current.nextDouble(-BOUNDS + posX, BOUNDS + posX), y,
        current.nextDouble(-BOUNDS + posZ, BOUNDS + posZ));
}
 

/**
 * Spawns a broken line that creates more and extended branches
 * as it gets closer to the end length.
 * This method doesn't support rotations. Use the direction instead.
 *
 * @param start      the starting point of the new branch. For the first call it's the same location as the displays location.
 * @param direction  the direction of the lightning. A simple direction would be {@code entity.getLocation().getDirection().normalize()}
 *                   For a simple end point direction would be {@code endLocation.toVector().subtract(start.toVector()).normalize()}
 * @param entries    the number of entries for the main lightning branch. Recommended is 20
 * @param branches   the maximum number of branches each entry can have. Recommended is 200
 * @param radius     the radius of the lightning branches. Recommended is 0.5
 * @param offset     the offset of the lightning branches. Recommended is 2
 * @param offsetRate the offset change rate of the lightning branches. Recommended is 1
 * @param length     the length of the lightning branch. Recommended is 1.5
 * @param lengthRate the length change rate of the lightning branch. Recommended is 1
 * @param branch     the chance of creating a new branch. Recommended is 0.1
 * @param branchRate the chance change of creating a new branch. Recommended is 1
 * @since 3.0.0
 */
public static void lightning(Location start, Vector direction, int entries, int branches, double radius,
                             double offset, double offsetRate,
                             double length, double lengthRate,
                             double branch, double branchRate, ParticleDisplay display) {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    if (entries <= 0) return;
    boolean inRange = true;

    // Check if we can create new branches or the current branch
    // length is already in range.
    while (random.nextDouble() < branch || inRange) {
        // Break our straight line randomly.
        Vector randomizer = new Vector(
                random.nextDouble(-radius, radius), random.nextDouble(-radius, radius), random.nextDouble(-radius, radius))
                .normalize().multiply((random.nextDouble(-radius, radius)) * offset);
        Vector endVector = start.clone().toVector().add(direction.clone().multiply(length)).add(randomizer);
        Location end = endVector.toLocation(start.getWorld());

        // Check if the broken line length is in our max length range.
        if (end.distance(start) <= length) {
            inRange = true;
            continue;
        } else inRange = false;

        // Create particle points in our broken straight line.
        int rate = (int) (start.distance(end) / 0.1); // distance * (distance / 10)
        Vector rateDir = endVector.clone().subtract(start.toVector()).normalize().multiply(0.1);
        for (int i = 0; i < rate; i++) {
            Location loc = start.clone().add(rateDir.clone().multiply(i));
            display.spawn(loc);
        }

        // Create new entries if possible.
        lightning(end.clone(), direction, entries - 1, branches - 1, radius, offset * offsetRate, offsetRate,
                length * lengthRate, lengthRate,
                branch * branchRate, branchRate, display);
        // Check if the maximum number of branches has already been used for this entry.
        if (branches <= 0) break;
    }
}