package com.alibaba.jstorm.batch.example;
import java.util.Map;
import java.util.Random;
import org.apache.log4j.Logger;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import com.alibaba.jstorm.batch.BatchId;
public class TransformBolt implements IBasicBolt {
private static final long serialVersionUID = 5720810158625748044L;
private static final Logger LOG = Logger.getLogger(TransformBolt.class);
public static final String BOLT_NAME = TransformBolt.class.getSimpleName();
private Map conf;
private Random rand;
@Override
public void prepare(Map stormConf, TopologyContext context) {
this.conf = stormConf;
this.rand = new Random();
rand.setSeed(System.currentTimeMillis());
LOG.info("Successfully do prepare");
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
BatchId id = (BatchId) input.getValue(0);
long value = rand.nextInt(100);
collector.emit(new Values(id, value));
}
@Override
public void cleanup() {
LOG.info("Successfully do cleanup");
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("BatchId", "Value"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
}