| /* |
| * 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 org.apache.cassandra.io.sstable.Descriptor; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.ObjectSizes; |
| import org.apache.cassandra.utils.Pair; |
| |
| public class KeyCacheKey extends CacheKey |
| { |
| public final Descriptor desc; |
| |
| private static final long EMPTY_SIZE = ObjectSizes.measure(new KeyCacheKey(null, null, ByteBufferUtil.EMPTY_BYTE_BUFFER)); |
| |
| // 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(Pair<String, String> ksAndCFName, Descriptor desc, ByteBuffer key) |
| { |
| |
| super(ksAndCFName); |
| this.desc = desc; |
| this.key = ByteBufferUtil.getArray(key); |
| assert 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 ksAndCFName.equals(that.ksAndCFName) && desc.equals(that.desc) && Arrays.equals(key, that.key); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result = ksAndCFName.hashCode(); |
| result = 31 * result + desc.hashCode(); |
| result = 31 * result + Arrays.hashCode(key); |
| return result; |
| } |
| } |