Example usage for org.apache.commons.collections4 IteratorUtils singletonIterator

Introduction

In this page you can find the example usage for org.apache.commons.collections4 IteratorUtils singletonIterator.

Prototype

public static <E> ResettableIterator<E> singletonIterator(final E object) 

Source Link

Document

Gets a singleton iterator.

Usage

From source file:org.apache.metron.profiler.spark.function.HBaseWriterFunction.java

/**
 * Writes a set of measurements to HBase.
 *
 * @param iterator The measurements to write.
 * @return The number of measurements written to HBase.
 *//*  w  w  w.  j a  v  a  2s  .co  m*/
@Override
public Iterator<Integer> call(Iterator<ProfileMeasurementAdapter> iterator) throws Exception {
    int count = 0;
    LOG.debug("About to write profile measurement(s) to HBase");

    // do not open hbase connection, if nothing to write
    List<ProfileMeasurementAdapter> measurements = IteratorUtils.toList(iterator);
    if (measurements.size() > 0) {

        // open an HBase connection
        Configuration config = HBaseConfiguration.create();
        try (HBaseClient client = new HBaseClient(tableProvider, config, tableName)) {

            for (ProfileMeasurementAdapter adapter : measurements) {
                ProfileMeasurement m = adapter.toProfileMeasurement();
                client.addMutation(rowKeyBuilder.rowKey(m), columnBuilder.columns(m), durability);
            }
            count = client.mutate();

        } catch (IOException e) {
            LOG.error("Unable to open connection to HBase", e);
            throw new RuntimeException(e);
        }
    }

    LOG.debug("{} profile measurement(s) written to HBase", count);
    return IteratorUtils.singletonIterator(count);
}

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From source file:org.jamocha.filter.PathNodeFilterSet.java

@Override
public Iterator<PathNodeFilterSet> iterator() {
    return IteratorUtils.singletonIterator(this);
}

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