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.alibaba.jstorm.flux.test;
  
  
  import backtype.storm.Config;
  import backtype.storm.generated.StormTopology;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Values;
  import storm.trident.TridentTopology;
  import storm.trident.operation.BaseFunction;
  import storm.trident.operation.TridentCollector;
  import storm.trident.operation.builtin.Count;
  import storm.trident.testing.FixedBatchSpout;
  import storm.trident.testing.MemoryMapState;
  import storm.trident.tuple.TridentTuple;
  
  /**
   * Basic Trident example that will return a `StormTopology` from a `getTopology()` method.
   */
  public class TridentTopologySource {
  
      private FixedBatchSpout spout;
  
      public StormTopology getTopology(Config config) {
  
          this.spout = new FixedBatchSpout(new Fields("sentence"), 20,
                  new Values("one two"),
                  new Values("two three"),
                  new Values("three four"),
                  new Values("four five"),
                  new Values("five six")
          );
  
  
          TridentTopology trident = new TridentTopology();
  
          trident.newStream("wordcount", spout).name("sentence").parallelismHint(1).shuffle()
                  .each(new Fields("sentence"), new Split(), new Fields("word"))
                  .parallelismHint(1)
                  .groupBy(new Fields("word"))
                  .persistentAggregate(new MemoryMapState.Factory(), new Count(), new Fields("count"))
                  .parallelismHint(1);
          return trident.build();
      }
  
      public static class Split extends BaseFunction {
          @Override
          public void execute(TridentTuple tuple, TridentCollector collector) {
              String sentence = tuple.getString(0);
              for (String word : sentence.split(" ")) {
                  collector.emit(new Values(word));
              }
          }
      }
  }
  