| /* |
| * 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.tinkerpop.gremlin.spark.process.computer; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.KeyValue; |
| import org.apache.tinkerpop.gremlin.process.computer.MapReduce; |
| import org.apache.tinkerpop.gremlin.process.computer.util.StaticMapReduce; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| import org.junit.Test; |
| import scala.Tuple2; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.UUID; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public class CombineIteratorTest { |
| |
| @Test |
| public void shouldBulkResults() { |
| long total = 0; |
| final List<Tuple2<String, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 100; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>("test", i)); |
| } |
| |
| final CombineIterator<String, Long, String, Long> combineIterator = new CombineIterator<>(new MapReduceA(), numbers.iterator()); |
| final Tuple2<String, Long> tuple = combineIterator.next(); |
| assertEquals("test", tuple._1()); |
| assertEquals(Long.valueOf(total), tuple._2()); |
| assertFalse(combineIterator.hasNext()); |
| } |
| |
| @Test |
| public void shouldDoubleBulkResults() { |
| long total = 0; |
| final List<Tuple2<String, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 9000; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>("test", i)); |
| } |
| |
| final CombineIterator<String, Long, String, Long> combineIterator = new CombineIterator<>(new MapReduceA(), numbers.iterator()); |
| assertTrue(combineIterator.hasNext()); |
| final Tuple2<String, Long> tuple = combineIterator.next(); |
| assertFalse(combineIterator.hasNext()); |
| assertEquals("test", tuple._1()); |
| assertEquals(total, tuple._2().longValue()); |
| } |
| |
| @Test |
| public void shouldTripleBulkResults() { |
| long total = 0; |
| final List<Tuple2<String, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 14000; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>("test", i)); |
| } |
| |
| final CombineIterator<String, Long, String, Long> combineIterator = new CombineIterator<>(new MapReduceA(), numbers.iterator()); |
| assertTrue(combineIterator.hasNext()); |
| final Tuple2<String, Long> tuple = combineIterator.next(); |
| assertFalse(combineIterator.hasNext()); |
| assertEquals("test", tuple._1()); |
| assertEquals(total, tuple._2().longValue()); |
| } |
| |
| @Test |
| public void shouldEndlessBulkResults() { |
| long total = 0; |
| final List<Tuple2<String, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 5000000; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>("test", i)); |
| } |
| |
| final CombineIterator<String, Long, String, Long> combineIterator = new CombineIterator<>(new MapReduceA(), numbers.iterator()); |
| assertTrue(combineIterator.hasNext()); |
| final Tuple2<String, Long> tuple = combineIterator.next(); |
| assertFalse(combineIterator.hasNext()); |
| assertEquals("test", tuple._1()); |
| assertEquals(total, tuple._2().longValue()); |
| } |
| |
| @Test |
| public void shouldEndlessBulkResultsWithNullObject() { |
| long total = 0; |
| final List<Tuple2<MapReduce.NullObject, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 5000000; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>(MapReduce.NullObject.instance(), i)); |
| } |
| |
| final CombineIterator<MapReduce.NullObject, Long, MapReduce.NullObject, Long> combineIterator = new CombineIterator<>(new MapReduceB(), numbers.iterator()); |
| assertTrue(combineIterator.hasNext()); |
| final Tuple2<MapReduce.NullObject, Long> tuple = combineIterator.next(); |
| assertFalse(combineIterator.hasNext()); |
| assertEquals(MapReduce.NullObject.instance(), tuple._1()); |
| assertEquals(total, tuple._2().longValue()); |
| } |
| |
| @Test |
| public void shouldBulkResultsByKey() { |
| long total = 0; |
| final List<Tuple2<String, Long>> numbers = new ArrayList<>(); |
| for (long i = 0; i < 9000; i++) { |
| total = total + i; |
| numbers.add(new Tuple2<>(UUID.randomUUID().toString(), i)); |
| } |
| |
| final CombineIterator<String, Long, String, Long> combineIterator = new CombineIterator<>(new MapReduceA(), numbers.iterator()); |
| assertEquals(9000, IteratorUtils.count(combineIterator)); |
| } |
| |
| private static class MapReduceA extends StaticMapReduce<String, Long, String, Long, Long> { |
| |
| @Override |
| public void combine(final String key, final Iterator<Long> values, final ReduceEmitter<String, Long> emitter) { |
| long counter = 0; |
| while (values.hasNext()) { |
| counter = counter + values.next(); |
| } |
| emitter.emit(key, counter); |
| } |
| |
| @Override |
| public boolean doStage(final Stage stage) { |
| return true; |
| } |
| |
| @Override |
| public String getMemoryKey() { |
| return "test"; |
| } |
| |
| @Override |
| public Long generateFinalResult(final Iterator<KeyValue<String, Long>> keyValues) { |
| return keyValues.next().getValue(); |
| } |
| } |
| |
| private static class MapReduceB extends StaticMapReduce<MapReduce.NullObject, Long, MapReduce.NullObject, Long, Long> { |
| |
| @Override |
| public void combine(final MapReduce.NullObject key, final Iterator<Long> values, final ReduceEmitter<MapReduce.NullObject, Long> emitter) { |
| long counter = 0; |
| while (values.hasNext()) { |
| counter = counter + values.next(); |
| } |
| emitter.emit(key, counter); |
| } |
| |
| @Override |
| public boolean doStage(final Stage stage) { |
| return true; |
| } |
| |
| @Override |
| public String getMemoryKey() { |
| return "test"; |
| } |
| |
| @Override |
| public Long generateFinalResult(final Iterator<KeyValue<MapReduce.NullObject, Long>> keyValues) { |
| return keyValues.next().getValue(); |
| } |
| } |
| } |