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.db;
  
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.dht.Token;
  
  public class CachedHashDecoratedKey extends BufferDecoratedKey
  {
      long hash0;
      long hash1;
      volatile boolean hashCached;
  
      public CachedHashDecoratedKey(Token token, ByteBuffer key)
      {
          super(token, key);
          hashCached = false;
      }
  
      @Override
      public void filterHash(long[] dest)
      {
          if (hashCached)
          {
              dest[0] = hash0;
              dest[1] = hash1;
          }
          else
          {
              super.filterHash(dest);
              hash0 = dest[0];
              hash1 = dest[1];
              hashCached = true;
          }
      }
  }
  