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.cassandra.stress.generate;
  
  import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
  
  import org.apache.cassandra.utils.DynamicList;
  
  public class Seed implements Comparable<Seed>
  {
  
      public final int visits;
      public final long seed;
  
      private volatile DynamicList.Node poolNode;
      private volatile int position;
  
      private static final AtomicIntegerFieldUpdater<Seed> positionUpdater = AtomicIntegerFieldUpdater.newUpdater(Seed.class, "position");
  
      public int compareTo(Seed that)
      {
          return Long.compare(this.seed, that.seed);
      }
  
      Seed(long seed, int visits)
      {
          this.seed = seed;
          this.visits = visits;
      }
  
      public int position()
      {
          return position;
      }
  
      public int moveForwards(int rowCount)
      {
          return positionUpdater.getAndAdd(this, rowCount);
      }
  
      public int hashCode()
      {
          return (int) seed;
      }
  
      public boolean equals(Object that)
      {
          return that instanceof Seed && this.seed == ((Seed) that).seed;
      }
  
      public boolean save(DynamicList<Seed> sampleFrom, int maxSize)
      {
          DynamicList.Node poolNode = sampleFrom.append(this, maxSize);
          if (poolNode == null)
              return false;
          this.poolNode = poolNode;
          return true;
      }
  
      public boolean isSaved()
      {
          return poolNode != null;
      }
  
      public void remove(DynamicList<Seed> sampleFrom)
      {
          sampleFrom.remove(poolNode);
      }
  }
  