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);
}
}