co.nubetech.hiho.similarity.ngram.TestNGramJob.java Source code

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/**
 * Copyright 2011 Nube Technologies
 *
 * 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 co.nubetech.hiho.similarity.ngram;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
import org.junit.Test;

import co.nubetech.hiho.common.HIHOException;
import co.nubetech.hiho.common.HihoTestCase;

public class TestNGramJob extends HihoTestCase {

    final static Logger logger = Logger.getLogger(co.nubetech.hiho.similarity.ngram.TestNGramJob.class);

    @Test
    public void testCheckMandatoryConfsValidValues() throws HIHOException {
        String[] args = new String[] { "-inputPath", "testData", };
        NGramJob nGramJob = new NGramJob();
        nGramJob.populateConfiguration(args);
        nGramJob.checkMandatoryConfs();
    }

    @Test(expected = HIHOException.class)
    public void testCheckMandatoryConfsForExpectedExceptionInInputPath() throws HIHOException {
        String[] args = new String[] {};
        NGramJob nGramJob = new NGramJob();
        nGramJob.populateConfiguration(args);
        nGramJob.checkMandatoryConfs();
    }

    public NGramJob runNgramJob(String[] args) throws Exception {
        NGramJob job = new NGramJob();
        int res = ToolRunner.run(createJobConf(), job, args);
        assertEquals(0, res);
        return job;
    }

    @Test
    public void testNGramJobForValidValues() throws Exception {
        final String inputData = "This is a book   value1\nThis is not a book   value2";
        createTextFileInHDFS(inputData, "/input", "testFile1.txt");
        String[] args = new String[] { "-inputPath", "/input" };
        NGramJob job = runNgramJob(args);

        FileSystem outputFS = getFileSystem();
        Path outputPath = new Path(outputFS.getHomeDirectory(), "outputOfNGramJob/part-r-00000");
        Configuration conf = new Configuration();
        SequenceFile.Reader reader = new SequenceFile.Reader(outputFS, outputPath, conf);
        Writable writableKey = (Writable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
        Writable writableValue = (Writable) ReflectionUtils.newInstance(reader.getValueClass(), conf);

        List<IntWritable> expectedOutputForValue = new ArrayList<IntWritable>();
        expectedOutputForValue.add(new IntWritable(1));
        expectedOutputForValue.add(new IntWritable(1));

        int count = 0;
        while (reader.next(writableKey, writableValue)) {
            logger.debug("Key and value is: " + writableKey + ", " + writableValue);
            assertTrue("Matched output " + writableValue, expectedOutputForValue.contains(writableValue));
            count++;
        }
        IOUtils.closeStream(reader);
        assertEquals(2, count);
    }

}