content: /**
   * 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 org.apache.storm.starter.bolt;
  
  import org.apache.storm.starter.tools.Rankings;
  
  import backtype.storm.tuple.Tuple;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * 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              = LoggerFactory.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;
      }
      
  }
  