package com.alibaba.jstorm.batch.example;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.log4j.Logger;
import backtype.storm.Config;
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 backtype.storm.utils.TimeCacheMap;
import com.alibaba.jstorm.batch.BatchId;
import com.alibaba.jstorm.batch.IPrepareCommit;
import com.alibaba.jstorm.utils.JStormUtils;
public class CountBolt implements IBasicBolt, IPrepareCommit {
private static final long serialVersionUID = 5720810158625748042L;
private static final Logger LOG = Logger.getLogger(CountBolt.class);
public static final String COUNT_BOLT_NAME = "Count";
public static final String SUM_BOLT_NAME = "Sum";
private Map conf;
private TimeCacheMap<BatchId, AtomicLong> counters;
@Override
public void prepare(Map stormConf, TopologyContext context) {
this.conf = stormConf;
int timeoutSeconds = JStormUtils.parseInt(
conf.get(Config.TOPOLOGY_MESSAGE_TIMEOUT_SECS), 30);
counters = new TimeCacheMap<BatchId, AtomicLong>(timeoutSeconds);
LOG.info("Successfully do prepare");
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
BatchId id = (BatchId) input.getValue(0);
AtomicLong counter = counters.get(id);
if (counter == null) {
counter = new AtomicLong(0);
counters.put(id, counter);
}
counter.incrementAndGet();
}
@Override
public void cleanup() {
LOG.info("Successfully do cleanup");
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("BatchId", "counters"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
@Override
public void prepareCommit(BatchId id, BasicOutputCollector collector) {
AtomicLong counter = (AtomicLong) counters.remove(id);
if (counter == null) {
counter = new AtomicLong(0);
}
collector.emit(new Values(id, counter.get()));
}
}