hadoop DefaultOutputter 源码
haddop DefaultOutputter 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/DefaultOutputter.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.OutputStream;
import org.apache.hadoop.conf.Configuration;
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.Compressor;
/**
* The default {@link Outputter} that outputs to a plain file. Compression
* will be applied if the path has the right suffix.
*/
public class DefaultOutputter<T> implements Outputter<T> {
JsonObjectMapperWriter<T> writer;
Compressor compressor;
@Override
public void init(Path path, Configuration conf) throws IOException {
FileSystem fs = path.getFileSystem(conf);
CompressionCodec codec = new CompressionCodecFactory(conf).getCodec(path);
OutputStream output;
if (codec != null) {
compressor = CodecPool.getCompressor(codec);
output = codec.createOutputStream(fs.create(path), compressor);
} else {
output = fs.create(path);
}
writer = new JsonObjectMapperWriter<T>(output,
conf.getBoolean("rumen.output.pretty.print", true));
}
@Override
public void output(T object) throws IOException {
writer.write(object);
}
@Override
public void close() throws IOException {
try {
writer.close();
} finally {
if (compressor != null) {
CodecPool.returnCompressor(compressor);
}
}
}
}
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