package backtype.storm.testing;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Fields;
import java.util.Map;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import java.util.HashMap;
import org.apache.log4j.Logger;
import static backtype.storm.utils.Utils.tuple;
public class TestWordCounter extends BaseBasicBolt {
public static Logger LOG = Logger.getLogger(TestWordCounter.class);
Map<String, Integer> _counts;
public void prepare(Map stormConf, TopologyContext context) {
_counts = new HashMap<String, Integer>();
}
public void execute(Tuple input, BasicOutputCollector collector) {
String word = (String) input.getValues().get(0);
int count = 0;
if(_counts.containsKey(word)) {
count = _counts.get(word);
}
count++;
_counts.put(word, count);
collector.emit(tuple(word, count));
}
public void cleanup() {
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word", "count"));
}
}