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public class WordCount implements IBasicBolt {
private Map<String, Integer> _counts = new HashMap<String, Integer>();
public void prepare(Map conf, TopologyContext context) {
public void execute(Tuple tuple, BasicOutputCollector collector) {
String word = tuple.getString(0);
int count;
if(_counts.containsKey(word)) {
count = _counts.get(word);
} else {
count = 0;
_counts.put(word, count);
collector.emit(new Values(word, count));
public void cleanup() {
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word", "count"));
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