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 backtype.storm.testing;
  
  import backtype.storm.generated.GlobalStreamId;
  import backtype.storm.grouping.CustomStreamGrouping;
  import backtype.storm.task.WorkerTopologyContext;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  public class NGrouping implements CustomStreamGrouping {
      int _n;
      List<Integer> _outTasks;
  
      public NGrouping(int n) {
          _n = n;
      }
  
      @Override
      public void prepare(WorkerTopologyContext context, GlobalStreamId stream, List<Integer> targetTasks) {
          targetTasks = new ArrayList<Integer>(targetTasks);
          Collections.sort(targetTasks);
          _outTasks = new ArrayList<Integer>();
          for (int i = 0; i < _n; i++) {
              _outTasks.add(targetTasks.get(i));
          }
      }
  
      @Override
      public List<Integer> chooseTasks(int taskId, List<Object> values) {
          return _outTasks;
      }
  
  }
  