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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ThreadLocalRandom;
  
  import backtype.storm.Config;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.tuple.Fields;
  import storm.trident.operation.TridentCollector;
  import storm.trident.spout.IBatchSpout;
  
  /**
   * This spout generates random whole numbers with given {@code maxNumber} value
   * as maximum with the given {@code fields}.
   *
   */
  public class RandomNumberGeneratorSpout implements IBatchSpout {
      private final Fields                        fields;
      private final int                           batchSize;
      private final int                           maxNumber;
      private final Map<Long, List<List<Object>>> batches = new HashMap<>();
      
      public RandomNumberGeneratorSpout(Fields fields, int batchSize, int maxNumber) {
          this.fields = fields;
          this.batchSize = batchSize;
          this.maxNumber = maxNumber;
      }
      
      @Override
      public void open(Map conf, TopologyContext context) {
      }
      
      @Override
      public void emitBatch(long batchId, TridentCollector collector) {
          List<List<Object>> values = null;
          if (batches.containsKey(batchId)) {
              values = batches.get(batchId);
          } else {
              values = new ArrayList<>();
              for (int i = 0; i < batchSize; i++) {
                  List<Object> numbers = new ArrayList<>();
                  for (int x = 0; x < fields.size(); x++) {
                      numbers.add(ThreadLocalRandom.current().nextInt(0, maxNumber + 1));
                  }
                  values.add(numbers);
              }
              batches.put(batchId, values);
          }
          for (List<Object> value : values) {
              collector.emit(value);
          }
      }
      
      @Override
      public void ack(long batchId) {
          batches.remove(batchId);
      }
      
      @Override
      public void close() {
      
      }
      
      @Override
      public Map<String, Object> getComponentConfiguration() {
          Config conf = new Config();
          conf.setMaxTaskParallelism(1);
          return conf;
      }
      
      @Override
      public Fields getOutputFields() {
          return fields;
      }
  }
  