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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
   *
   *     https://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,
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   * See the License for the specific language governing permissions and
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  package org.apache.trevni.avro;
  
  import java.io.IOException;
  import java.util.StringTokenizer;
  
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.mapred.JobClient;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.FileInputFormat;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.lib.NullOutputFormat;
  import org.apache.hadoop.mapred.Reporter;
  
  import org.apache.avro.generic.GenericData;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.mapred.AvroJob;
  import org.apache.avro.mapred.Pair;
  import org.apache.avro.mapred.AvroMapper;
  import org.apache.avro.mapred.AvroReducer;
  import org.apache.avro.mapred.AvroCollector;
  
  import org.apache.avro.Schema;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class TestWordCount {
  
    public static class MapImpl extends AvroMapper<String, Pair<String, Long>> {
      @Override
      public void map(String text, AvroCollector<Pair<String, Long>> collector, Reporter reporter) throws IOException {
        StringTokenizer tokens = new StringTokenizer(text);
        while (tokens.hasMoreTokens())
          collector.collect(new Pair<>(tokens.nextToken(), 1L));
      }
    }
  
    public static class ReduceImpl extends AvroReducer<String, Long, Pair<String, Long>> {
      @Override
      public void reduce(String word, Iterable<Long> counts, AvroCollector<Pair<String, Long>> collector,
          Reporter reporter) throws IOException {
        long sum = 0;
        for (long count : counts)
          sum += count;
        collector.collect(new Pair<>(word, sum));
      }
    }
  
    @Test
    void runTestsInOrder() throws Exception {
      testOutputFormat();
      testInputFormat();
    }
  
    static final Schema STRING = Schema.create(Schema.Type.STRING);
    static {
      GenericData.setStringType(STRING, GenericData.StringType.String);
    }
    static final Schema LONG = Schema.create(Schema.Type.LONG);
  
    public void testOutputFormat() throws Exception {
      JobConf job = new JobConf();
  
      WordCountUtil wordCountUtil = new WordCountUtil("trevniMapredTest");
  
      wordCountUtil.writeLinesFile();
  
      AvroJob.setInputSchema(job, STRING);
      AvroJob.setOutputSchema(job, Pair.getPairSchema(STRING, LONG));
  
      AvroJob.setMapperClass(job, MapImpl.class);
      AvroJob.setCombinerClass(job, ReduceImpl.class);
      AvroJob.setReducerClass(job, ReduceImpl.class);
  
      FileInputFormat.setInputPaths(job, new Path(wordCountUtil.getDir().toString() + "/in"));
      FileOutputFormat.setOutputPath(job, new Path(wordCountUtil.getDir().toString() + "/out"));
      FileOutputFormat.setCompressOutput(job, true);
  
      job.setOutputFormat(AvroTrevniOutputFormat.class);
  
      JobClient.runJob(job);
  
      wordCountUtil.validateCountsFile();
    }
  
    private static long total;
  
    public static class Counter extends AvroMapper<GenericRecord, Void> {
      @Override
      public void map(GenericRecord r, AvroCollector<Void> collector, Reporter reporter) throws IOException {
        total += (Long) r.get("value");
      }
    }
  
    public void testInputFormat() throws Exception {
      JobConf job = new JobConf();
  
      WordCountUtil wordCountUtil = new WordCountUtil("trevniMapredTest");
  
      Schema subSchema = new Schema.Parser().parse("{\"type\":\"record\"," + "\"name\":\"PairValue\"," + "\"fields\": [ "
          + "{\"name\":\"value\", \"type\":\"long\"}" + "]}");
      AvroJob.setInputSchema(job, subSchema);
      AvroJob.setMapperClass(job, Counter.class);
      FileInputFormat.setInputPaths(job, new Path(wordCountUtil.getDir().toString() + "/out/*"));
      job.setInputFormat(AvroTrevniInputFormat.class);
  
      job.setNumReduceTasks(0); // map-only
      job.setOutputFormat(NullOutputFormat.class); // ignore output
  
      total = 0;
      JobClient.runJob(job);
      assertEquals(WordCountUtil.TOTAL, total);
    }
  
  }
  