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.spout;
  
  import java.util.Map;
  import java.util.Random;
  
  import backtype.storm.spout.SpoutOutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.base.BaseRichSpout;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Values;
  import backtype.storm.utils.Utils;
  
  public class RandomSentenceSpout extends BaseRichSpout {
      SpoutOutputCollector _collector;
      Random               _rand;
      
      @Override
      public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
          _collector = collector;
          _rand = new Random();
      }
      
      @Override
      public void nextTuple() {
          Utils.sleep(100);
          String[] sentences = new String[] { "the cow jumped over the moon", "an apple a day keeps the doctor away",
                  "four score and seven years ago", "snow white and the seven dwarfs", "i am at two with nature" };
          String sentence = sentences[_rand.nextInt(sentences.length)];
          _collector.emit(new Values(sentence));
      }
      
      @Override
      public void ack(Object id) {
      }
      
      @Override
      public void fail(Object id) {
      }
      
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("word"));
      }
      
  }
  