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 com.jstorm.example.unittests.window;
  
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.base.BaseRichBolt;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Values;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * @author binyang.dby on 2016/7/22.
   */
  public class WindowTestCountAggBolt extends BaseRichBolt {
      // Mapping of key->upstreamBolt->count
      private Map<Object, Map<Integer, Long>> counts = new HashMap<Object, Map<Integer, Long>>();
      private OutputCollector collector;
  
      @Override
      public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
          this.collector = collector;
      }
  
      @Override
      public void execute(Tuple input) {
          Object obj = input.getValue(0);
          long count = input.getLong(1);
          int source = input.getSourceTask();
  
          System.out.println("### obj = " + obj + " count = " + count + " src = " + source);
  
          Map<Integer, Long> subCounts = counts.get(obj);
          if (subCounts == null) {
              subCounts = new HashMap<Integer, Long>();
              counts.put(obj, subCounts);
          }
          // Update the current count for this object
          subCounts.put(source, count);
          // Output the sum of all the known counts so for this key
          long sum = 0;
          for (Long val : subCounts.values()) {
              sum += val;
          }
          collector.emit(new Values(obj, sum));
      }
  
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("obj", "count"));
      }
  }
  