Example usage for java.util Collections emptyListIterator

Introduction

In this page you can find the example usage for java.util Collections emptyListIterator.

Prototype

@SuppressWarnings("unchecked")
public static <T> ListIterator<T> emptyListIterator() 

Source Link

Document

Returns a list iterator that has no elements.

Usage

From source file:Main.java

public static ListIterator getMy() {
    String nullFlag = null;//from  w  w w .jav a  2s. c om
    if (nullFlag == null) {
        return Collections.emptyListIterator();
    }
    return null;
}

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From source file:org.apache.storm.kafka.spout.KafkaSpout.java

@Override
public void open(Map<String, Object> conf, TopologyContext context, SpoutOutputCollector collector) {
    initialized = false;/* ww  w .j a v  a2  s .  co  m*/
    this.context = context;

    // Spout internals
    this.collector = collector;
    numUncommittedOffsets = 0;

    // Offset management
    firstPollOffsetStrategy = kafkaSpoutConfig.getFirstPollOffsetStrategy();

    // Retries management
    retryService = kafkaSpoutConfig.getRetryService();

    tupleListener = kafkaSpoutConfig.getTupleListener();

    if (isAtLeastOnce()) {
        // Only used if the spout commits offsets for acked tuples
        commitTimer = new Timer(TIMER_DELAY_MS, kafkaSpoutConfig.getOffsetsCommitPeriodMs(),
                TimeUnit.MILLISECONDS);
    }
    refreshSubscriptionTimer = new Timer(TIMER_DELAY_MS, kafkaSpoutConfig.getPartitionRefreshPeriodMs(),
            TimeUnit.MILLISECONDS);

    offsetManagers = new HashMap<>();
    emitted = new HashSet<>();
    waitingToEmit = Collections.emptyListIterator();

    tupleListener.open(conf, context);

    LOG.info("Kafka Spout opened with the following configuration: {}", kafkaSpoutConfig);
}

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