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; 021 022import org.apache.hadoop.hbase.util.Bytes; 023import org.apache.yetus.audience.InterfaceAudience; 024 025/** 026 * This Cell is an implementation of {@link ByteBufferExtendedCell} where the data resides in 027 * off heap/ on heap ByteBuffer 028 */ 029@InterfaceAudience.Private 030public class SizeCachedByteBufferKeyValue extends ByteBufferKeyValue { 031 032 public static final int FIXED_OVERHEAD = Bytes.SIZEOF_SHORT + Bytes.SIZEOF_INT; 033 private short rowLen; 034 private int keyLen; 035 036 public SizeCachedByteBufferKeyValue(ByteBuffer buf, int offset, int length, long seqId, 037 int keyLen) { 038 super(buf, offset, length); 039 // We will read all these cached values at least once. Initialize now itself so that we can 040 // avoid uninitialized checks with every time call 041 this.rowLen = super.getRowLength(); 042 this.keyLen = keyLen; 043 setSequenceId(seqId); 044 } 045 046 public SizeCachedByteBufferKeyValue(ByteBuffer buf, int offset, int length, long seqId, 047 int keyLen, short rowLen) { 048 super(buf, offset, length); 049 // We will read all these cached values at least once. Initialize now itself so that we can 050 // avoid uninitialized checks with every time call 051 this.rowLen = rowLen; 052 this.keyLen = keyLen; 053 setSequenceId(seqId); 054 } 055 056 @Override 057 public short getRowLength() { 058 return rowLen; 059 } 060 061 @Override 062 public int getKeyLength() { 063 return this.keyLen; 064 } 065 066 @Override 067 public long heapSize() { 068 return super.heapSize() + FIXED_OVERHEAD; 069 } 070 071 /** 072 * Override by just returning the length for saving cost of method dispatching. If not, it will 073 * call {@link ExtendedCell#getSerializedSize()} firstly, then forward to 074 * {@link SizeCachedKeyValue#getSerializedSize(boolean)}. (See HBASE-21657) 075 */ 076 @Override 077 public int getSerializedSize() { 078 return this.length; 079 } 080 081 @Override 082 public boolean equals(Object other) { 083 return super.equals(other); 084 } 085 086 @Override 087 public int hashCode() { 088 return super.hashCode(); 089 } 090}