cn.lhfei.hadoop.ch04.PooledStreamCompressor.java Source code

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Here is the source code for cn.lhfei.hadoop.ch04.PooledStreamCompressor.java

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/*
 * Copyright 2010-2011 the original author or authors.
 *
 * Licensed 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 cn.lhfei.hadoop.ch04;

import java.io.IOException;

import org.apache.commons.compress.compressors.CompressorOutputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.compress.CodecPool;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionOutputStream;
import org.apache.hadoop.io.compress.Compressor;
import org.apache.hadoop.util.ReflectionUtils;

/**
 * @version 0.1
 *
 * @author Hefei Li
 *
 * @since Oct 28, 2014
 */

public class PooledStreamCompressor {

    /**
     * use case: 
     * 
     * @param args
     */
    public static void main(String[] args) {
        String codecClassname = args[0];
        Class<?> codecClass = null;
        CompressionOutputStream out = null;
        Compressor compressor = null;
        try {
            codecClass = Class.forName(codecClassname);
            Configuration conf = new Configuration();
            CompressionCodec codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, conf);
            compressor = CodecPool.getCompressor(codec);

            out = codec.createOutputStream(System.out, compressor);

            IOUtils.copyBytes(System.in, out, 4096, false);

            out.finish();

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            CodecPool.returnCompressor(compressor);
        }
    }
}