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.task.group;
  
  import java.util.List;
  
  import com.alibaba.jstorm.daemon.worker.WorkerData;
  import com.alibaba.jstorm.utils.JStormUtils;
  import com.alibaba.jstorm.utils.RandomRange;
  
  public abstract class Shuffer {
      protected WorkerData workerData;
  
      public Shuffer(WorkerData workerData) {
          this.workerData = workerData;
      }
  
      public abstract List<Integer> grouper(List<Object> values);
  
      protected int getActiveTask(RandomRange randomrange, List<Integer> outTasks) {
          int index = randomrange.nextInt();
          int size = outTasks.size();
          int i;
          for (i = 0; i < size; i++) {
              if (workerData.isOutboundTaskActive(Integer.valueOf(outTasks.get(index))))
                  break;
              else
                  index = randomrange.nextInt();
          }
  
          return (i < size ? index : -1);
      }
  }