| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package storm.starter.bolt; |
| |
| import backtype.storm.tuple.Tuple; |
| import org.apache.log4j.Logger; |
| import storm.starter.tools.Rankings; |
| |
| /** |
| * This bolt merges incoming {@link Rankings}. |
| * <p/> |
| * 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); |
| super.getRankings().pruneZeroCounts(); |
| } |
| |
| @Override |
| Logger getLogger() { |
| return LOG; |
| } |
| |
| } |