hadoop PossiblyDecompressedInputStream 源码
haddop PossiblyDecompressedInputStream 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/PossiblyDecompressedInputStream.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.tools.rumen;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.compress.CodecPool;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.io.compress.Decompressor;
class PossiblyDecompressedInputStream extends InputStream {
private final Decompressor decompressor;
private final InputStream coreInputStream;
public PossiblyDecompressedInputStream(Path inputPath, Configuration conf)
throws IOException {
CompressionCodecFactory codecs = new CompressionCodecFactory(conf);
CompressionCodec inputCodec = codecs.getCodec(inputPath);
FileSystem ifs = inputPath.getFileSystem(conf);
FSDataInputStream fileIn = ifs.open(inputPath);
if (inputCodec == null) {
decompressor = null;
coreInputStream = fileIn;
} else {
decompressor = CodecPool.getDecompressor(inputCodec);
coreInputStream = inputCodec.createInputStream(fileIn, decompressor);
}
}
@Override
public int read() throws IOException {
return coreInputStream.read();
}
@Override
public int read(byte[] buffer, int offset, int length) throws IOException {
return coreInputStream.read(buffer, offset, length);
}
@Override
public void close() throws IOException {
// coreInputStream.close() is called before returning of decompressor to the
// pool because coreInputStream.close() could(though currently it doesn't)
// access the decompressor.
coreInputStream.close();
if (decompressor != null) {
CodecPool.returnDecompressor(decompressor);
}
}
}
相关信息
相关文章
hadoop AbstractClusterStory 源码
hadoop CDFPiecewiseLinearRandomGenerator 源码
hadoop ClusterTopologyReader 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦