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.io.hfile;
019
020import org.apache.hadoop.hbase.io.ByteBuffAllocator;
021import org.apache.hadoop.hbase.nio.ByteBuff;
022import org.apache.yetus.audience.InterfaceAudience;
023
024/**
025 * The {@link ByteBuffAllocator} won't allocate pooled heap {@link ByteBuff} now; at the same time,
026 * if allocate an off-heap {@link ByteBuff} from allocator, then it must be a pooled one. That's to
027 * say, an exclusive memory HFileBlock would must be an heap block and a shared memory HFileBlock
028 * would must be an off-heap block.
029 * @see org.apache.hadoop.hbase.io.hfile.ExclusiveMemHFileBlock
030 **/
031@InterfaceAudience.Private
032public class SharedMemHFileBlock extends HFileBlock {
033
034  SharedMemHFileBlock(BlockType blockType, int onDiskSizeWithoutHeader,
035    int uncompressedSizeWithoutHeader, long prevBlockOffset, ByteBuff buf, boolean fillHeader,
036    long offset, int nextBlockOnDiskSize, int onDiskDataSizeWithHeader, HFileContext fileContext,
037    ByteBuffAllocator alloc) {
038    super(blockType, onDiskSizeWithoutHeader, uncompressedSizeWithoutHeader, prevBlockOffset, buf,
039      fillHeader, offset, nextBlockOnDiskSize, onDiskDataSizeWithHeader, fileContext, alloc);
040  }
041
042  @Override
043  public boolean isSharedMem() {
044    return true;
045  }
046}