package storm.starter.bolt;
import org.apache.log4j.Logger;
import storm.starter.tools.Rankings;
import backtype.storm.tuple.Tuple;
/**
* This bolt merges incoming {@link Rankings}.
*
* It can be used to merge intermediate rankings generated by {@link IntermediateRankingsBolt} into a final,
* consolidated ranking. To do so, configure this bolt with a globalGrouping on {@link IntermediateRankingsBolt}.
*
*/
public final class TotalRankingsBolt extends AbstractRankerBolt {
private static final long serialVersionUID = -8447525895532302198L;
private static final Logger LOG = Logger.getLogger(TotalRankingsBolt.class);
public TotalRankingsBolt() {
super();
}
public TotalRankingsBolt(int topN) {
super(topN);
}
public TotalRankingsBolt(int topN, int emitFrequencyInSeconds) {
super(topN, emitFrequencyInSeconds);
}
@Override
void updateRankingsWithTuple(Tuple tuple) {
Rankings rankingsToBeMerged = (Rankings) tuple.getValue(0);
super.getRankings().updateWith(rankingsToBeMerged);
}
@Override
Logger getLogger() {
return LOG;
}
}