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.cache;
  
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Objects;
  
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.ObjectSizes;
  
  public class KeyCacheKey extends CacheKey
  {
      public final Descriptor desc;
  
      private static final long EMPTY_SIZE = ObjectSizes.measure(new KeyCacheKey());
  
      // keeping an array instead of a ByteBuffer lowers the overhead of the key cache working set,
      // without extra copies on lookup since client-provided key ByteBuffers will be array-backed already
      public final byte[] key;
  
      public KeyCacheKey(TableMetadata tableMetadata, Descriptor desc, ByteBuffer key)
      {
          super(tableMetadata);
          this.desc = desc;
          this.key = ByteBufferUtil.getArray(key);
          assert this.key != null;
      }
  
      private KeyCacheKey() // Only for EMPTY_SIZE
      {
          super(null, null);
          this.desc = null;
          this.key = null;
      }
  
      public String toString()
      {
          return String.format("KeyCacheKey(%s, %s)", desc, ByteBufferUtil.bytesToHex(ByteBuffer.wrap(key)));
      }
  
      public long unsharedHeapSize()
      {
          return EMPTY_SIZE + ObjectSizes.sizeOfArray(key);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          KeyCacheKey that = (KeyCacheKey) o;
  
          return tableId.equals(that.tableId)
                 && Objects.equals(indexName, that.indexName)
                 && desc.equals(that.desc)
                 && Arrays.equals(key, that.key);
      }
  
      @Override
      public int hashCode()
      {
          int result = tableId.hashCode();
          result = 31 * result + Objects.hashCode(indexName);
          result = 31 * result + desc.hashCode();
          result = 31 * result + Arrays.hashCode(key);
          return result;
      }
  }
  