org.apache.hama.bsp.message.compress.TestBSPMessageCompressor.java Source code

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/**
 * 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.hama.bsp.message.compress;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Iterator;

import junit.framework.TestCase;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.IntWritable;
import org.apache.hama.bsp.BSPMessageBundle;

public class TestBSPMessageCompressor extends TestCase {

    public void testCompression() throws IOException {
        Configuration configuration = new Configuration();
        BSPMessageCompressor<IntWritable> compressor = new BSPMessageCompressorFactory<IntWritable>()
                .getCompressor(configuration);

        assertNull(compressor);
        configuration.setClass(BSPMessageCompressorFactory.COMPRESSION_CODEC_CLASS, Bzip2Compressor.class,
                BSPMessageCompressor.class);
        compressor = new BSPMessageCompressorFactory<IntWritable>().getCompressor(configuration);

        assertNotNull(compressor);

        BSPMessageBundle<IntWritable> a = new BSPMessageBundle<IntWritable>();
        for (int i = 0; i < 10000; i++) {
            a.addMessage(new IntWritable(i));
        }

        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
        DataOutputStream bufferDos = new DataOutputStream(byteBuffer);
        a.write(bufferDos);

        byte[] compressed = compressor.compress(byteBuffer.toByteArray());
        assertTrue(byteBuffer.size() > compressed.length);
        byte[] decompressed = compressor.decompress(compressed);

        ByteArrayInputStream bis = new ByteArrayInputStream(decompressed);
        DataInputStream in = new DataInputStream(bis);

        BSPMessageBundle<IntWritable> b = new BSPMessageBundle<IntWritable>();
        b.readFields(in);
        Iterator<IntWritable> it = b.iterator();
        int counter = 0;
        while (it.hasNext()) {
            assertTrue(it.next().get() == counter);
            counter++;
        }
    }
}