hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/OffheapChunk.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.regionserver.ChunkCreator.ChunkType;
  23 import org.apache.yetus.audience.InterfaceAudience;
  24
  25 /**
  26  * An off heap chunk implementation.
  27  */
  28 @InterfaceAudience.Private
  29 public class OffheapChunk extends Chunk {
  30
  31   OffheapChunk(int size, int id, ChunkType chunkType) {
  32     // better if this is always created fromPool. This should not be called
  33     super(size, id, chunkType);
  34   }
  35
  36   OffheapChunk(int size, int id, ChunkType chunkType, boolean fromPool) {
  37     super(size, id, chunkType, fromPool);
  38     assert fromPool == true;
  39   }
  40
  41   @Override
  42   void allocateDataBuffer() {
  43     if (data == null) {
  44       data = ByteBuffer.allocateDirect(this.size);
  45       data.putInt(0, this.getId());
  46     }
  47   }
  48 }