Example usage for java.util.concurrent ThreadLocalRandom current

List of usage examples for java.util.concurrent ThreadLocalRandom current

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Introduction

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

Prototype

public static ThreadLocalRandom current()

Source Link

Document

Returns the current thread's ThreadLocalRandom .

Usage

From source file:io.prestosql.operator.aggregation.AbstractTestApproximateCountDistinct.java

@Test(dataProvider = "provideStandardErrors")
public void testMixedNullsAndNonNulls(double maxStandardError) {
    int uniques = getUniqueValuesCount();
    List<Object> baseline = createRandomSample(uniques, (int) (uniques * 1.5));

    // Randomly insert nulls
    // We need to retain the preexisting order to ensure that the HLL can generate the same estimates.
    Iterator<Object> iterator = baseline.iterator();
    List<Object> mixed = new ArrayList<>();
    while (iterator.hasNext()) {
        mixed.add(ThreadLocalRandom.current().nextBoolean() ? null : iterator.next());
    }//  w  w w .j  a va2  s  . co  m

    assertCount(mixed, maxStandardError, estimateGroupByCount(baseline, maxStandardError));
}

From source file:com.github.benmanes.caffeine.cache.Stresser.java

public void run() throws InterruptedException {
    ConcurrentTestHarness.timeTasks(operation.maxThreads, () -> {
        int index = ThreadLocalRandom.current().nextInt();
        for (;;) {
            Integer key = ints[index++ & MASK];
            switch (operation) {
            case READ:
                cache.getIfPresent(key);
                break;
            case WRITE:
                cache.put(key, key);/*from  w  w  w .j  a v a  2  s.c o m*/
                break;
            case REFRESH:
                cache.refresh(key);
                break;
            }
        }
    });
}

From source file:org.apache.jmeter.functions.RandomFromMultipleVars.java

/** {@inheritDoc} */
@Override//from  w w w  .ja  v a 2s  .  co  m
public String execute(SampleResult previousResult, Sampler currentSampler) throws InvalidVariableException {

    String variablesNamesSplitBySeparatorValue = variablesNamesSplitBySeparator.execute().trim();
    JMeterVariables vars = getVariables();
    String outputValue = "";
    String separator = "";
    if (vars != null) { // vars will be null on TestPlan
        List<String> results = new ArrayList<>();
        String[] variables = variablesNamesSplitBySeparatorValue.split(SEPARATOR);
        for (String varName : variables) {
            if (!StringUtils.isEmpty(varName)) {
                extractVariableValuesToList(varName, vars, results);
            }
        }

        if (results.size() > 0) {
            int randomIndex = ThreadLocalRandom.current().nextInt(0, results.size());
            outputValue = results.get(randomIndex);
        } else {
            if (log.isDebugEnabled()) {
                log.debug("RandomFromMultiResult didn't find <var>_matchNr in variables :'"
                        + variablesNamesSplitBySeparatorValue + "' using separator:'" + separator
                        + "', will return empty value");
            }
        }

        if (varName != null) {
            final String varTrim = varName.execute().trim();
            if (varTrim.length() > 0) {
                vars.put(varTrim, outputValue);
            }
        }
    }
    return outputValue;

}

From source file:org.apache.hadoop.hbase.io.asyncfs.TestFanOutOneBlockAsyncDFSOutput.java

static void writeAndVerify(EventLoop eventLoop, DistributedFileSystem dfs, Path f,
        final FanOutOneBlockAsyncDFSOutput out) throws IOException, InterruptedException, ExecutionException {
    final byte[] b = new byte[10];
    ThreadLocalRandom.current().nextBytes(b);
    final FanOutOneBlockAsyncDFSOutputFlushHandler handler = new FanOutOneBlockAsyncDFSOutputFlushHandler();
    eventLoop.execute(new Runnable() {

        @Override//from ww w.j  a v a  2s .  c om
        public void run() {
            out.write(b, 0, b.length);
            out.flush(null, handler, false);
        }
    });
    assertEquals(b.length, handler.get());
    out.close();
    assertEquals(b.length, dfs.getFileStatus(f).getLen());
    byte[] actual = new byte[b.length];
    try (FSDataInputStream in = dfs.open(f)) {
        in.readFully(actual);
    }
    assertArrayEquals(b, actual);
}

From source file:ffx.algorithms.mc.BoltzmannMC.java

/**
 * Criterion for accept/reject a move; intended to be used mostly internally.
 * @param e1 Initial energy//from  w  w w.  j a v  a  2  s  .co m
 * @param e2 Final energy
 * @return If move accepted
 */
@Override
public boolean evaluateMove(double e1, double e2) {
    if (e2 <= e1) {
        return true;
    } else {
        // p(X) = exp(-U(X)/kb*T)
        double prob = FastMath.exp(kbTinv * (e2 - e1));

        assert (prob >= 0.0 && prob <= 1.0) : "Probability of a Monte Carlo move up in energy should be 0-1";

        double trial = ThreadLocalRandom.current().nextDouble();
        return (trial <= prob);
    }
}

From source file:ubicrypt.core.TestUtils.java

/**
 * Returns a free port number on localhost.
 *
 * <p>Heavily inspired from org.eclipse.jdt.launching.SocketUtil (to avoid a dependency to JDT
 * just because of this). Slightly improved with stop() missing in JDT. And throws exception
 * instead of returning -1.//from w ww  .j a  va2s .  com
 *
 * @return a free port number on localhost
 * @throws IllegalStateException if unable to find a free port
 */
public static int findFreePort() {
    ServerSocket socket = null;
    do {
        try {
            final int port = ThreadLocalRandom.current().nextInt(49152, 65535 + 1);
            socket = new ServerSocket(port);
            socket.setReuseAddress(false);
            try {
                socket.close();
            } catch (final IOException e) {
                // Ignore IOException on stop()
            }
            return port;
        } catch (final IOException e) {
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (final IOException e) {
                }
            }
        }
    } while (true);
}

From source file:org.lambda3.indra.service.mock.MockedNeighborsResourceImpl.java

@Override
public NeighborRelatednessResponse getNeighborRelatedness(NeighborRelatednessRequest request) {
    Map<String, Map<String, Double>> terms = new HashMap<>();

    for (String term : request.getTerms()) {
        Map<String, Double> ns = new HashMap<>();
        for (String neighbor : getRandomWords()) {
            ns.put(neighbor, ThreadLocalRandom.current().nextDouble(0, 1));
        }/*from   ww w  . j a  va  2 s. c o m*/

        terms.put(term, ns);
    }

    return new NeighborRelatednessResponse(request, terms);
}

From source file:com.github.jinahya.codec.BossVsEngineerTestNanoTimeDecode.java

@Test
public void testDecode() {

    final double[] elapsedLikeABoss = new double[ROUNDS];
    final double[] elapsedLikeAnEngineer = new double[ROUNDS];

    for (int i = 0; i < ROUNDS; i++) {
        final byte[] encoded = Tests.encodedBytes();
        if (ThreadLocalRandom.current().nextBoolean()) {
            elapsedLikeABoss[i] = decodeLikeABoss(encoded);
            elapsedLikeAnEngineer[i] = decodeLikeAnEngineer(encoded);
        } else {//from   w w  w  . ja va  2 s.com
            elapsedLikeAnEngineer[i] = decodeLikeAnEngineer(encoded);
            elapsedLikeABoss[i] = decodeLikeABoss(encoded);
        }
    }

    LOGGER.log(Level.INFO, "elapsed.like.a.boss: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]", new Object[] {
            StatUtils.mean(elapsedLikeABoss, 1, elapsedLikeABoss.length - 1), elapsedLikeABoss[0],
            elapsedLikeABoss[1], elapsedLikeABoss[2], elapsedLikeABoss[elapsedLikeABoss.length - 3],
            elapsedLikeABoss[elapsedLikeABoss.length - 2], elapsedLikeABoss[elapsedLikeABoss.length - 1] });

    LOGGER.log(Level.INFO, "elapsed.like.an.engineer: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]",
            new Object[] { StatUtils.mean(elapsedLikeAnEngineer, 1, elapsedLikeAnEngineer.length - 1),
                    elapsedLikeAnEngineer[0], elapsedLikeAnEngineer[1], elapsedLikeAnEngineer[2],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 3],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 2],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 1] });
}

From source file:com.github.jinahya.codec.BossVsEngineerTestNanoTimeEncode.java

@Test
public void testEncode() {

    final double[] elapsedLikeABoss = new double[ROUNDS];
    final double[] elapsedLikeAnEngineer = new double[ROUNDS];

    for (int i = 0; i < ROUNDS; i++) {
        final byte[] decoded = Tests.decodedBytes();
        if (ThreadLocalRandom.current().nextBoolean()) {
            elapsedLikeABoss[i] = encodeLikeABoss(decoded);
            elapsedLikeAnEngineer[i] = encodeLikeAnEngineer(decoded);
        } else {/*from w w w . j  av  a 2s .  c  om*/
            elapsedLikeAnEngineer[i] = encodeLikeAnEngineer(decoded);
            elapsedLikeABoss[i] = encodeLikeABoss(decoded);
        }
    }

    LOGGER.log(Level.INFO, "elapsed.like.a.boss: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]", new Object[] {
            StatUtils.mean(elapsedLikeABoss, 1, elapsedLikeABoss.length - 1), elapsedLikeABoss[0],
            elapsedLikeABoss[1], elapsedLikeABoss[2], elapsedLikeABoss[elapsedLikeABoss.length - 3],
            elapsedLikeABoss[elapsedLikeABoss.length - 2], elapsedLikeABoss[elapsedLikeABoss.length - 1] });

    LOGGER.log(Level.INFO, "elapsed.like.an.engineer: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]",
            new Object[] { StatUtils.mean(elapsedLikeAnEngineer, 1, elapsedLikeAnEngineer.length - 1),
                    elapsedLikeAnEngineer[0], elapsedLikeAnEngineer[1], elapsedLikeAnEngineer[2],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 3],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 2],
                    elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 1] });
}

From source file:com.adaptris.core.services.WaitService.java

protected long waitMs() {
    long maxWaitMs = TimeInterval.toMillisecondsDefaultIfNull(getWaitInterval(), DEFAULT_WAIT);
    return randomizeWait() ? ThreadLocalRandom.current().nextLong(maxWaitMs) : maxWaitMs;
}