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.alipay.dw.jstorm.example.window;
  
  import java.util.List;
  import java.util.Map;
  
  import org.apache.storm.starter.bolt.PrinterBolt;
  import org.apache.storm.starter.bolt.SlidingWindowSumBolt;
  import org.apache.storm.starter.spout.RandomIntegerSpout;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.alibaba.starter.utils.Assert;
  import com.alibaba.starter.utils.JStormHelper;
  
  import backtype.storm.Config;
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.TopologyBuilder;
  import backtype.storm.topology.base.BaseWindowedBolt;
  import backtype.storm.topology.base.BaseWindowedBolt.Count;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Values;
  import backtype.storm.windowing.TupleWindow;
  
  /**
   * A sample topology that demonstrates the usage of
   * {@link org.apache.storm.topology.IWindowedBolt} to calculate sliding window
   * sum.
   */
  public class SlidingWindowTopology {
      
      private static final Logger LOG = LoggerFactory.getLogger(SlidingWindowTopology.class);
      
      /*
       * Computes tumbling window average
       */
      private static class TumblingWindowAvgBolt extends BaseWindowedBolt {
          private OutputCollector collector;
          
          @Override
          public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
              this.collector = collector;
          }
          
          @Override
          public void execute(TupleWindow inputWindow) {
              int sum = 0;
              List<Tuple> tuplesInWindow = inputWindow.get();
              LOG.debug("Events in current window: " + tuplesInWindow.size());
              if (tuplesInWindow.size() > 0) {
                  /*
                   * Since this is a tumbling window calculation, we use all the
                   * tuples in the window to compute the avg.
                   */
                  for (Tuple tuple : tuplesInWindow) {
                      sum += (int) tuple.getValue(0);
                  }
                  collector.emit(new Values(sum / tuplesInWindow.size()));
              }
          }
          
          @Override
          public void declareOutputFields(OutputFieldsDeclarer declarer) {
              declarer.declare(new Fields("avg"));
          }
      }
      
      static boolean isLocal = true;
      static Config  conf    = JStormHelper.getConfig(null);
      
      public static void test() {
          
          String[] className = Thread.currentThread().getStackTrace()[1].getClassName().split("\\.");
          String topologyName = className[className.length - 1];
          
          try {
              TopologyBuilder builder = new TopologyBuilder();
              builder.setSpout("integer", new RandomIntegerSpout(), 1);
              builder.setBolt("slidingsum", new SlidingWindowSumBolt().withWindow(new Count(30), new Count(10)), 1)
                      .shuffleGrouping("integer");
              builder.setBolt("tumblingavg", new TumblingWindowAvgBolt().withTumblingWindow(new Count(3)), 1)
                      .shuffleGrouping("slidingsum");
              builder.setBolt("printer", new PrinterBolt(), 1).shuffleGrouping("tumblingavg");
              
              conf.setDebug(true);
              
              JStormHelper.runTopology(builder.createTopology(), topologyName, conf, 60,
                      new JStormHelper.CheckAckedFail(conf), isLocal);
          } catch (Exception e) {
              // TODO Auto-generated catch block
              e.fillInStackTrace();
              Assert.fail("Failed to submit topology");
          }
      }
      
      public static void main(String[] args) throws Exception {
          isLocal = false;
          conf = JStormHelper.getConfig(args);
          test();
      }
      
  }
  