org.apache.hudi.org.apache.hadoop.hbase.io.hfile.bucket.ExclusiveMemoryMmapIOEngine Maven / Gradle / Ivy

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.apache.hadoop.hbase.io.hfile.bucket;

import java.io.IOException;

import org.apache.hadoop.hbase.io.hfile.Cacheable;
import org.apache.hadoop.hbase.nio.ByteBuff;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * IO engine that stores data to a file on the local block device using memory mapping mechanism
 */
@InterfaceAudience.Private
public class ExclusiveMemoryMmapIOEngine extends FileMmapIOEngine {

  public ExclusiveMemoryMmapIOEngine(String filePath, long capacity) throws IOException {
    super(filePath, capacity);
  }

  @Override
  public Cacheable read(BucketEntry be) throws IOException {
    ByteBuff dst = be.allocator.allocate(be.getLength());
    bufferArray.read(be.offset(), dst);
    dst.position(0).limit(be.getLength());
    return be.wrapAsCacheable(dst);
  }
}