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.AtomicLong;
  
  public class DistributionSequence extends Distribution
  {
  
      private final long start;
      private final long totalCount;
      private final AtomicLong next = new AtomicLong();
  
      public DistributionSequence(long start, long end)
      {
          if (start > end)
              throw new IllegalStateException();
          this.start = start;
          this.totalCount = 1 + end - start;
      }
  
      private long nextWithWrap()
      {
          long next = this.next.getAndIncrement();
          return start + (next % totalCount);
      }
  
      @Override
      public long next()
      {
          return nextWithWrap();
      }
  
      @Override
      public double nextDouble()
      {
          return nextWithWrap();
      }
  
      @Override
      public long inverseCumProb(double cumProb)
      {
          return (long) (start + (totalCount-1) * cumProb);
      }
  
      @Override
      public void setSeed(long seed)
      {
          next.set(seed);
      }
  
  }
  
  