001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase; 019 020import java.nio.ByteBuffer; 021import org.apache.hadoop.hbase.util.Bytes; 022import org.apache.yetus.audience.InterfaceAudience; 023 024/** 025 * This Cell is an implementation of {@link ByteBufferExtendedCell} where the data resides in off 026 * heap/ on heap ByteBuffer 027 */ 028@InterfaceAudience.Private 029public class SizeCachedByteBufferKeyValue extends ByteBufferKeyValue { 030 031 public static final int FIXED_OVERHEAD = Bytes.SIZEOF_SHORT + Bytes.SIZEOF_INT; 032 private short rowLen; 033 private int keyLen; 034 035 public SizeCachedByteBufferKeyValue(ByteBuffer buf, int offset, int length, long seqId, 036 int keyLen) { 037 super(buf, offset, length); 038 // We will read all these cached values at least once. Initialize now itself so that we can 039 // avoid uninitialized checks with every time call 040 this.rowLen = super.getRowLength(); 041 this.keyLen = keyLen; 042 setSequenceId(seqId); 043 } 044 045 public SizeCachedByteBufferKeyValue(ByteBuffer buf, int offset, int length, long seqId, 046 int keyLen, short rowLen) { 047 super(buf, offset, length); 048 // We will read all these cached values at least once. Initialize now itself so that we can 049 // avoid uninitialized checks with every time call 050 this.rowLen = rowLen; 051 this.keyLen = keyLen; 052 setSequenceId(seqId); 053 } 054 055 @Override 056 public short getRowLength() { 057 return rowLen; 058 } 059 060 @Override 061 public int getKeyLength() { 062 return this.keyLen; 063 } 064 065 @Override 066 public long heapSize() { 067 return super.heapSize() + FIXED_OVERHEAD; 068 } 069 070 /** 071 * Override by just returning the length for saving cost of method dispatching. If not, it will 072 * call {@link ExtendedCell#getSerializedSize()} firstly, then forward to 073 * {@link SizeCachedKeyValue#getSerializedSize(boolean)}. (See HBASE-21657) 074 */ 075 @Override 076 public int getSerializedSize() { 077 return this.length; 078 } 079 080 @Override 081 public boolean equals(Object other) { 082 return super.equals(other); 083 } 084 085 @Override 086 public int hashCode() { 087 return super.hashCode(); 088 } 089}