hadoop CombinedFileRange 源码
haddop CombinedFileRange 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/CombinedFileRange.java
/*
* 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.fs.impl;
import org.apache.hadoop.fs.FileRange;
import java.util.ArrayList;
import java.util.List;
/**
* A file range that represents a set of underlying file ranges.
* This is used when we combine the user's FileRange objects
* together into a single read for efficiency.
*/
public class CombinedFileRange extends FileRangeImpl {
private ArrayList<FileRange> underlying = new ArrayList<>();
public CombinedFileRange(long offset, long end, FileRange original) {
super(offset, (int) (end - offset));
this.underlying.add(original);
}
/**
* Get the list of ranges that were merged together to form this one.
* @return the list of input ranges
*/
public List<FileRange> getUnderlying() {
return underlying;
}
/**
* Merge this input range into the current one, if it is compatible.
* It is assumed that otherOffset is greater or equal the current offset,
* which typically happens by sorting the input ranges on offset.
* @param otherOffset the offset to consider merging
* @param otherEnd the end to consider merging
* @param other the underlying FileRange to add if we merge
* @param minSeek the minimum distance that we'll seek without merging the
* ranges together
* @param maxSize the maximum size that we'll merge into a single range
* @return true if we have merged the range into this one
*/
public boolean merge(long otherOffset, long otherEnd, FileRange other,
int minSeek, int maxSize) {
long end = this.getOffset() + this.getLength();
long newEnd = Math.max(end, otherEnd);
if (otherOffset - end >= minSeek || newEnd - this.getOffset() > maxSize) {
return false;
}
this.setLength((int) (newEnd - this.getOffset()));
underlying.add(other);
return true;
}
}
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