hadoop FileRange 源码
haddop FileRange 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileRange.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;
import java.nio.ByteBuffer;
import java.util.concurrent.CompletableFuture;
import org.apache.hadoop.fs.impl.FileRangeImpl;
/**
* A byte range of a file.
* This is used for the asynchronous gather read API of
* {@link PositionedReadable#readVectored}.
*/
public interface FileRange {
/**
* Get the starting offset of the range.
* @return the byte offset of the start
*/
long getOffset();
/**
* Get the length of the range.
* @return the number of bytes in the range.
*/
int getLength();
/**
* Get the future data for this range.
* @return the future for the {@link ByteBuffer} that contains the data
*/
CompletableFuture<ByteBuffer> getData();
/**
* Set a future for this range's data.
* This method is called by {@link PositionedReadable#readVectored} to store the
* data for the user to pick up later via {@link #getData}.
* @param data the future of the ByteBuffer that will have the data
*/
void setData(CompletableFuture<ByteBuffer> data);
/**
* Factory method to create a FileRange object.
* @param offset starting offset of the range.
* @param length length of the range.
* @return a new instance of FileRangeImpl.
*/
static FileRange createFileRange(long offset, int length) {
return new FileRangeImpl(offset, length);
}
}
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