//import util packages
import java.util.HashMap;
import java.util.Map;

import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;

//import Storm IRichBolt package
import org.apache.storm.topology.IRichBolt;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.tuple.Tuple;

//Create a class CallLogCreatorBolt which implement IRichBolt interface
public class CallLogCreatorBolt implements IRichBolt {
   //Create instance for OutputCollector which collects and emits tuples to produce output
   private OutputCollector collector;

   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      this.collector = collector;
   }

   @Override
   public void execute(Tuple tuple) {
      String from = tuple.getString(0);
      String to = tuple.getString(1);
      Integer duration = tuple.getInteger(2);
      collector.emit(new Values(from + " - " + to, duration));
   }

   @Override
   public void cleanup() {}

   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("call", "duration"));
   }
	
   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }
}