com.datasalt.utils.mapred.joiner.TestMultiJoinerSameClass.java Source code

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Here is the source code for com.datasalt.utils.mapred.joiner.TestMultiJoinerSameClass.java

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/**
 * Copyright [2011] [Datasalt Systems S.L.]
 *
 * 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 com.datasalt.utils.mapred.joiner;

import static org.junit.Assert.*;
import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.util.Iterator;

import com.datasalt.utils.thrift.test.A;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.junit.Test;

import com.datasalt.utils.commons.HadoopUtils;
import com.datasalt.utils.commons.test.BaseTest;
import com.datasalt.utils.mapred.joiner.MultiJoinChanneledMapper;
import com.datasalt.utils.mapred.joiner.MultiJoinDatum;
import com.datasalt.utils.mapred.joiner.MultiJoinPair;
import com.datasalt.utils.mapred.joiner.MultiJoinReducer;
import com.datasalt.utils.mapred.joiner.MultiJoiner;

public class TestMultiJoinerSameClass extends BaseTest {

    public static final String OUTPUT_FOR_TEST = "test-" + TestMultiJoinerSameClass.class.getName();

    /**
     * Group by ID 
     * 
     * @author pere
     *
     */
    public static class AMapperSameClass extends MultiJoinChanneledMapper<LongWritable, Text, A> {

        protected void map(LongWritable key, Text value, Context context)
                throws java.io.IOException, InterruptedException {

            A a = new A();
            String[] fields = value.toString().split("\t");
            a.setId(fields[0]);
            a.setUrl(fields[1]);
            emit(a.getId(), a);
        };
    }

    private static class TestReducerSameClass extends MultiJoinReducer<Text, Text> {

        protected void reduce(@SuppressWarnings("rawtypes") MultiJoinPair arg0, Iterable<MultiJoinDatum<?>> arg1,
                Context arg2) throws java.io.IOException, InterruptedException {

            Iterator<MultiJoinDatum<?>> datums = arg1.iterator();
            MultiJoinDatum<?> datum = datums.next();
            A a = deserialize(datum);
            assertEquals(datum.getChannelId(), 0);
            if (a.getId().equals("id1")) {
                assertEquals(a.getUrl(), "http://foo.bar");
                datum = datums.next();
                assertEquals(datum.getChannelId(), 1);
                A a2 = deserialize(datum);
                assertEquals(a2.getUrl(), "http://new.foo.bar");
            } else {
                assertEquals(a.getUrl(), "http://hello.com");
                datum = datums.next();
                assertEquals(datum.getChannelId(), 1);
                A a2 = deserialize(datum);
                assertEquals(a2.getUrl(), "http://new.hello.com");
            }
        };
    }

    @Test
    public void test() throws IOException, InterruptedException, ClassNotFoundException {

        Configuration conf = getConf();
        MultiJoiner multiJoiner = new MultiJoiner("MultiJoiner Test", conf);
        multiJoiner.setReducer(TestReducerSameClass.class);
        multiJoiner.setOutputKeyClass(Text.class);
        multiJoiner.setOutputValueClass(Text.class);
        multiJoiner.setOutputFormat(TextOutputFormat.class);
        multiJoiner.setOutputPath(new Path(OUTPUT_FOR_TEST));
        Job job = multiJoiner
                .addChanneledInput(0, new Path("src/test/resources/multijoiner.test.a.txt"), A.class,
                        TextInputFormat.class, AMapperSameClass.class)
                .addChanneledInput(1, new Path("src/test/resources/multijoiner.test.same.class.a.txt"), A.class,
                        TextInputFormat.class, AMapperSameClass.class)
                .getJob();
        job.waitForCompletion(true);
        assertTrue(job.isSuccessful());

        HadoopUtils.deleteIfExists(FileSystem.get(conf), new Path(OUTPUT_FOR_TEST));
    }
}