org.apache.apex.examples.mroperator.MapOperatorTest.java Source code

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Here is the source code for org.apache.apex.examples.mroperator.MapOperatorTest.java

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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.apex.examples.mroperator;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.apex.malhar.lib.testbench.CollectorTestSink;
import org.apache.commons.io.FileUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.serializer.SerializationFactory;
import org.apache.hadoop.io.serializer.Serializer;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.TextInputFormat;

@SuppressWarnings("deprecation")
public class MapOperatorTest {

    private static Logger LOG = LoggerFactory.getLogger(MapOperatorTest.class);

    @Rule
    public TestMeta testMeta = new TestMeta();

    /**
     * Test node logic emits correct results
     */
    @Test
    public void testNodeProcessing() throws Exception {
        testNodeProcessingSchema(new MapOperator<LongWritable, Text, Text, IntWritable>());
    }

    public void testNodeProcessingSchema(MapOperator<LongWritable, Text, Text, IntWritable> oper)
            throws IOException {

        CollectorTestSink sortSink = new CollectorTestSink();
        oper.output.setSink(sortSink);

        oper.setMapClass(WordCount.Map.class);
        oper.setCombineClass(WordCount.Reduce.class);
        oper.setDirName(testMeta.testDir);
        oper.setConfigFile(null);
        oper.setInputFormatClass(TextInputFormat.class);

        Configuration conf = new Configuration();
        JobConf jobConf = new JobConf(conf);
        FileInputFormat.setInputPaths(jobConf, new Path(testMeta.testDir));
        TextInputFormat inputFormat = new TextInputFormat();
        inputFormat.configure(jobConf);
        InputSplit[] splits = inputFormat.getSplits(jobConf, 1);
        SerializationFactory serializationFactory = new SerializationFactory(conf);
        Serializer keySerializer = serializationFactory.getSerializer(splits[0].getClass());
        keySerializer.open(oper.getOutstream());
        keySerializer.serialize(splits[0]);
        oper.setInputSplitClass(splits[0].getClass());
        keySerializer.close();
        oper.setup(null);
        oper.beginWindow(0);
        oper.emitTuples();
        oper.emitTuples();
        oper.endWindow();
        oper.beginWindow(1);
        oper.emitTuples();
        oper.endWindow();

        Assert.assertEquals("number emitted tuples", 3, sortSink.collectedTuples.size());
        for (Object o : sortSink.collectedTuples) {
            LOG.debug(o.toString());
        }
        LOG.debug("Done testing round\n");
        oper.teardown();
    }

    public static class TestMeta extends TestWatcher {
        public final String file1 = "file1";
        public String baseDir;
        public String testDir;

        @Override
        protected void starting(org.junit.runner.Description description) {
            String methodName = description.getMethodName();
            String className = description.getClassName();
            baseDir = "target/" + className;
            testDir = baseDir + "/" + methodName;
            try {
                FileUtils.forceMkdir(new File(testDir));
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
            createFile(testDir + "/" + file1, "1\n2\n3\n1\n2\n3\n");
        }

        private void createFile(String fileName, String data) {
            BufferedWriter output = null;
            try {
                output = new BufferedWriter(new FileWriter(new File(fileName)));
                output.write(data);
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            } finally {
                if (output != null) {
                    try {
                        output.close();
                    } catch (IOException ex) {
                        LOG.error("not able to close the output stream: ", ex);
                    }
                }
            }
        }

        @Override
        protected void finished(Description description) {
            try {
                FileUtils.deleteDirectory(new File(baseDir));
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        }
    }

}