/**
* 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.crunch.lib;
import static junit.framework.Assert.assertEquals;
import static org.apache.crunch.types.avro.Avros.ints;
import static org.apache.crunch.types.avro.Avros.records;
import static org.apache.crunch.types.avro.Avros.strings;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.specific.SpecificDatumWriter;
import org.apache.crunch.MapFn;
import org.apache.crunch.PCollection;
import org.apache.crunch.impl.mr.MRPipeline;
import org.apache.crunch.io.At;
import org.apache.crunch.test.Person;
import org.apache.crunch.test.TemporaryPath;
import org.apache.crunch.test.TemporaryPaths;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import com.google.common.collect.Lists;
/**
* Test sorting Avro types by selected inner field
*/
public class AvroTypeSortIT implements Serializable {
private static final long serialVersionUID = 1344118240353796561L;
private transient File avroFile;
@Rule
public transient TemporaryPath tmpDir = TemporaryPaths.create();
@Before
public void setUp() throws IOException {
avroFile = File.createTempFile("avrotest", ".avro");
}
@After
public void tearDown() {
avroFile.delete();
}
@Test
public void testSortAvroTypesBySelectedFields() throws Exception {
MRPipeline pipeline = new MRPipeline(AvroTypeSortIT.class, tmpDir.getDefaultConfiguration());
Person ccc10 = createPerson("CCC", 10);
Person bbb20 = createPerson("BBB", 20);
Person aaa30 = createPerson("AAA", 30);
writeAvroFile(Lists.newArrayList(ccc10, bbb20, aaa30), avroFile);
PCollection<Person> unsorted = pipeline.read(At.avroFile(avroFile.getAbsolutePath(), records(Person.class)));
// Sort by Name
MapFn<Person, String> nameExtractor = new MapFn<Person, String>() {
@Override
public String map(Person input) {
return input.name.toString();
}
};
PCollection<Person> sortedByName = unsorted.by(nameExtractor, strings()).groupByKey().ungroup().values();
List<Person> sortedByNameList = Lists.newArrayList(sortedByName.materialize());
assertEquals(3, sortedByNameList.size());
assertEquals(aaa30, sortedByNameList.get(0));
assertEquals(bbb20, sortedByNameList.get(1));
assertEquals(ccc10, sortedByNameList.get(2));
// Sort by Age
MapFn<Person, Integer> ageExtractor = new MapFn<Person, Integer>() {
@Override
public Integer map(Person input) {
return input.age;
}
};
PCollection<Person> sortedByAge = unsorted.by(ageExtractor, ints()).groupByKey().ungroup().values();
List<Person> sortedByAgeList = Lists.newArrayList(sortedByAge.materialize());
assertEquals(3, sortedByAgeList.size());
assertEquals(ccc10, sortedByAgeList.get(0));
assertEquals(bbb20, sortedByAgeList.get(1));
assertEquals(aaa30, sortedByAgeList.get(2));
pipeline.done();
}
private void writeAvroFile(List<Person> people, File avroFile) throws IOException {
FileOutputStream outputStream = new FileOutputStream(avroFile);
SpecificDatumWriter<Person> writer = new SpecificDatumWriter<Person>(Person.class);
DataFileWriter<Person> dataFileWriter = new DataFileWriter<Person>(writer);
dataFileWriter.create(Person.SCHEMA$, outputStream);
for (Person person : people) {
dataFileWriter.append(person);
}
dataFileWriter.close();
outputStream.close();
}
private Person createPerson(String name, int age) throws IOException {
Person person = new Person();
person.age = age;
person.name = name;
List<CharSequence> siblingNames = Lists.newArrayList();
person.siblingnames = siblingNames;
return person;
}
}