Example usage for java.util.concurrent ThreadLocalRandom current

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 testMultiplePositionsPartial(double maxStandardError) {
    for (int i = 0; i < 100; ++i) {
        int uniques = ThreadLocalRandom.current().nextInt(getUniqueValuesCount()) + 1;
        List<Object> values = createRandomSample(uniques, (int) (uniques * 1.5));
        assertEquals(estimateCountPartial(values, maxStandardError),
                estimateGroupByCount(values, maxStandardError));
    }/*from w ww .j  av a2  s .co m*/
}

From source file:com.netflix.spinnaker.halyard.cli.command.v1.NestableCommand.java

private static void showRandomFailureMessage() {
    if (ThreadLocalRandom.current().nextInt(0, 100) < 5) {
        int index = ThreadLocalRandom.current().nextInt(0, failureMessages.length);
        String message = failureMessages[index];
        AnsiUi.failure(message);//  w w w .  j  a va2s.  com
    }
}

From source file:org.apache.druid.indexing.kafka.test.TestBroker.java

public Map<String, String> consumerProperties() {
    final Map<String, String> props = Maps.newHashMap();
    props.put("bootstrap.servers", StringUtils.format("localhost:%d", getPort()));
    props.put("key.deserializer", ByteArrayDeserializer.class.getName());
    props.put("value.deserializer", ByteArrayDeserializer.class.getName());
    props.put("group.id", String.valueOf(ThreadLocalRandom.current().nextInt()));
    props.put("auto.offset.reset", "earliest");
    return props;
}

From source file:com.facebook.presto.operator.aggregation.BootstrappedAggregation.java

@Override
public GroupedAccumulator createGroupedAggregation(Optional<Integer> maskChannel,
        Optional<Integer> sampleWeightChannel, double confidence, int... argumentChannels) {
    checkArgument(sampleWeightChannel.isPresent(), "sample weight must be present for bootstrapping");
    return createDeterministicGroupedAggregation(maskChannel, sampleWeightChannel.get(), confidence,
            ThreadLocalRandom.current().nextLong(), argumentChannels);
}

From source file:org.wso2.carbon.analytics.data.commons.test.AnalyticsRecordStoreTest.java

private List<Record> generateRecordsForUpdate(List<Record> recordsIn) {
    List<Record> result = new ArrayList<>();
    int randInt = ThreadLocalRandom.current().nextInt(0, 65536);
    Map<String, Object> values;
    for (Record recordIn : recordsIn) {
        values = new HashMap<>();
        values.put("server_name", "ESB-" + recordIn.getId());
        values.put("ip", "192.168.0." + (recordIn.getTimestamp() % 256));
        values.put("tenant", randInt);
        values.put("change_index", randInt + 0.3454452);
        result.add(new Record(recordIn.getId(), recordIn.getTableName(), values, System.currentTimeMillis()));
    }/*from  w  w w  .  ja v a  2 s  .c o m*/
    return result;
}

From source file:com.adaptris.core.services.splitter.ServiceWorkerPool.java

/**
 * /*  w  ww .j  av  a 2  s.  com*/
 * @deprecated since 3.8.3 switch to commons-pool2 and {@link createCommonsObjectPool()} instead.
 */
@Deprecated
@Removal(version = "3.9.0", message = "use commons-pool2 + createCommonsObjectPool()")
public org.apache.commons.pool.impl.GenericObjectPool<Worker> createObjectPool() throws CoreException {
    logDeprecationWarning();
    org.apache.commons.pool.impl.GenericObjectPool<Worker> pool = new org.apache.commons.pool.impl.GenericObjectPool(
            new LegacyCommonsPoolWorkerFactory());
    pool.setMaxActive(maxThreads);
    pool.setMinIdle(maxThreads);
    pool.setMaxIdle(maxThreads);
    pool.setMaxWait(-1L);
    pool.setWhenExhaustedAction(org.apache.commons.pool.impl.GenericObjectPool.WHEN_EXHAUSTED_BLOCK);
    pool.setMinEvictableIdleTimeMillis(EVICT_RUN);
    pool.setTimeBetweenEvictionRunsMillis(EVICT_RUN + ThreadLocalRandom.current().nextLong(EVICT_RUN));
    return pool;
}

From source file:org.apache.hadoop.hbase.client.TestAsyncGetMultiThread.java

private void run(AtomicBoolean stop) throws InterruptedException, ExecutionException {
    while (!stop.get()) {
        int i = ThreadLocalRandom.current().nextInt(COUNT);
        assertEquals(i, Bytes.toInt(CONN.getRawTable(TABLE_NAME)
                .get(new Get(Bytes.toBytes(String.format("%03d", i)))).get().getValue(FAMILY, QUALIFIER)));
    }/*from   w w  w  . j  av a 2  s. c  o  m*/
}

From source file:com.facebook.presto.operator.aggregation.BootstrappedAggregation.java

@Override
public GroupedAccumulator createGroupedIntermediateAggregation(double confidence) {
    return createDeterministicGroupedIntermediateAggregation(confidence,
            ThreadLocalRandom.current().nextLong());
}

From source file:org.apache.sysml.utils.lite.BuildLiteExecution.java

public static void jmlcUnivariateStatistics() throws Exception {

    Connection conn = getConfiguredConnection();

    String dml = conn.readScript("scripts/algorithms/Univar-Stats.dml");
    Map<String, String> m = new HashMap<>();
    m.put("$CONSOLE_OUTPUT", "TRUE");

    PreparedScript script = conn.prepareScript(dml, m, new String[] { "A", "K" }, new String[] { "baseStats" },
            false);/*from  ww  w . j  ava 2s .c o m*/

    double[][] data = new double[100][4];
    for (int i = 0; i < 100; i++) {
        int one = ThreadLocalRandom.current().nextInt(0, 101);
        int two = ThreadLocalRandom.current().nextInt(0, 101);
        int three = ThreadLocalRandom.current().nextInt(0, 101);
        int four = ThreadLocalRandom.current().nextInt(1, 3);
        double[] row = new double[] { one, two, three, four };
        data[i] = row;
    }
    log.debug(displayMatrix(data));

    double[][] types = matrix(1, 4, new double[] { 1, 1, 1, 2 });

    script.setMatrix("A", data);
    script.setMatrix("K", types);
    double[][] baseStats = script.executeScript().getMatrix("baseStats");
    log.debug(displayMatrix(baseStats));

    conn.close();
}

From source file:org.apache.hadoop.hbase.util.MultiHConnection.java

/**
 * Randomly pick a connection and process the batch of actions for a given table
 * @param actions the actions//  ww  w  .j  a  v a2 s .  co  m
 * @param tableName table name
 * @param results the results array
 * @param callback 
 * @throws IOException
 */
@SuppressWarnings("deprecation")
public <R> void processBatchCallback(List<? extends Row> actions, TableName tableName, Object[] results,
        Batch.Callback<R> callback) throws IOException {
    // Currently used by RegionStateStore
    // A deprecated method is used as multiple threads accessing RegionStateStore do a single put
    // and htable is not thread safe. Alternative would be to create an Htable instance for each 
    // put but that is not very efficient.
    // See HBASE-11610 for more details.
    try {
        hConnections[ThreadLocalRandom.current().nextInt(noOfConnections)].processBatchCallback(actions,
                tableName, this.batchPool, results, callback);
    } catch (InterruptedException e) {
        throw new InterruptedIOException(e.getMessage());
    }
}