hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ByteBufferChunkKeyValue.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase.regionserver;
  19
  20 import java.nio.ByteBuffer;
  21
  22 import org.apache.hadoop.hbase.ByteBufferKeyValue;
  23 import org.apache.yetus.audience.InterfaceAudience;
  24 import org.apache.hadoop.hbase.util.ByteBufferUtils;
  25
  26 /**
  27  * ByteBuffer based cell which has the chunkid at the 0th offset
  28  * @see MemStoreLAB
  29  */
  30 //TODO : When moving this cell to CellChunkMap we will have the following things
  31 // to be serialized
  32 // chunkId (Integer) + offset (Integer) + length (Integer) + seqId (Long) = 20 bytes
  33 @InterfaceAudience.Private
  34 public class ByteBufferChunkKeyValue extends ByteBufferKeyValue {
  35   public ByteBufferChunkKeyValue(ByteBuffer buf, int offset, int length) {
  36     super(buf, offset, length);
  37   }
  38
  39   public ByteBufferChunkKeyValue(ByteBuffer buf, int offset, int length, long seqId) {
  40     super(buf, offset, length, seqId);
  41   }
  42
  43   @Override
  44   public int getChunkId() {
  45     // The chunkId is embedded at the 0th offset of the bytebuffer
  46     return ByteBufferUtils.toInt(buf, 0);
  47   }
  48 }