/***********************************************************************************************************************
*
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.pact.runtime.task.drivers;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.junit.Assert;
import org.junit.Test;
import eu.stratosphere.api.common.functions.GenericGroupReduce;
import eu.stratosphere.api.java.functions.GroupReduceFunction;
import eu.stratosphere.api.java.tuple.Tuple2;
import eu.stratosphere.api.java.typeutils.TypeExtractor;
import eu.stratosphere.pact.runtime.task.AllGroupReduceDriver;
import eu.stratosphere.pact.runtime.task.DriverStrategy;
import eu.stratosphere.pact.runtime.test.util.DiscardingOutputCollector;
import eu.stratosphere.pact.runtime.util.EmptyMutableObjectIterator;
import eu.stratosphere.pact.runtime.util.RegularToMutableObjectIterator;
import eu.stratosphere.types.IntValue;
import eu.stratosphere.types.StringValue;
import eu.stratosphere.types.TypeInformation;
import eu.stratosphere.util.Collector;
import eu.stratosphere.util.MutableObjectIterator;
@SuppressWarnings("serial")
public class AllGroupReduceDriverTest {
@Test
public void testAllReduceDriverImmutableEmpty() {
try {
TestTaskContext<GenericGroupReduce<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String, Integer>> context =
new TestTaskContext<GenericGroupReduce<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String,Integer>>();
List<Tuple2<String, Integer>> data = DriverTestData.createReduceImmutableData();
TypeInformation<Tuple2<String, Integer>> typeInfo = TypeExtractor.getForObject(data.get(0));
MutableObjectIterator<Tuple2<String, Integer>> input = EmptyMutableObjectIterator.get();
context.setDriverStrategy(DriverStrategy.ALL_GROUP_REDUCE);
context.setInput1(input, typeInfo.createSerializer());
context.setCollector(new DiscardingOutputCollector<Tuple2<String, Integer>>());
AllGroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>> driver = new AllGroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>>();
driver.setup(context);
driver.prepare();
driver.run();
}
catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
@Test
public void testAllReduceDriverImmutable() {
try {
TestTaskContext<GenericGroupReduce<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String, Integer>> context =
new TestTaskContext<GenericGroupReduce<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String,Integer>>();
List<Tuple2<String, Integer>> data = DriverTestData.createReduceImmutableData();
TypeInformation<Tuple2<String, Integer>> typeInfo = TypeExtractor.getForObject(data.get(0));
MutableObjectIterator<Tuple2<String, Integer>> input = new RegularToMutableObjectIterator<Tuple2<String, Integer>>(data.iterator(), typeInfo.createSerializer());
GatheringCollector<Tuple2<String, Integer>> result = new GatheringCollector<Tuple2<String,Integer>>(typeInfo.createSerializer());
context.setDriverStrategy(DriverStrategy.ALL_GROUP_REDUCE);
context.setInput1(input, typeInfo.createSerializer());
context.setCollector(result);
context.setUdf(new ConcatSumReducer());
AllGroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>> driver = new AllGroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>>();
driver.setup(context);
driver.prepare();
driver.run();
Tuple2<String,Integer> res = result.getList().get(0);
char[] foundString = res.f0.toCharArray();
Arrays.sort(foundString);
char[] expectedString = "abcddeeeffff".toCharArray();
Arrays.sort(expectedString);
Assert.assertArrayEquals(expectedString, foundString);
Assert.assertEquals(78, res.f1.intValue());
}
catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
@Test
public void testAllReduceDriverMutable() {
try {
TestTaskContext<GenericGroupReduce<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>> context =
new TestTaskContext<GenericGroupReduce<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>>();
List<Tuple2<StringValue, IntValue>> data = DriverTestData.createReduceMutableData();
TypeInformation<Tuple2<StringValue, IntValue>> typeInfo = TypeExtractor.getForObject(data.get(0));
MutableObjectIterator<Tuple2<StringValue, IntValue>> input = new RegularToMutableObjectIterator<Tuple2<StringValue, IntValue>>(data.iterator(), typeInfo.createSerializer());
GatheringCollector<Tuple2<StringValue, IntValue>> result = new GatheringCollector<Tuple2<StringValue, IntValue>>(typeInfo.createSerializer());
context.setDriverStrategy(DriverStrategy.ALL_GROUP_REDUCE);
context.setInput1(input, typeInfo.createSerializer());
context.setCollector(result);
context.setUdf(new ConcatSumMutableReducer());
AllGroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> driver = new AllGroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>();
driver.setup(context);
driver.prepare();
driver.run();
Tuple2<StringValue, IntValue> res = result.getList().get(0);
char[] foundString = res.f0.getValue().toCharArray();
Arrays.sort(foundString);
char[] expectedString = "abcddeeeffff".toCharArray();
Arrays.sort(expectedString);
Assert.assertArrayEquals(expectedString, foundString);
Assert.assertEquals(78, res.f1.getValue());
}
catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
// --------------------------------------------------------------------------------------------
// Test UDFs
// --------------------------------------------------------------------------------------------
public static final class ConcatSumReducer extends GroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>> {
@Override
public void reduce(Iterator<Tuple2<String, Integer>> values, Collector<Tuple2<String, Integer>> out) {
Tuple2<String, Integer> current = values.next();
while (values.hasNext()) {
Tuple2<String, Integer> next = values.next();
next.f0 = current.f0 + next.f0;
next.f1 = current.f1 + next.f1;
current = next;
}
out.collect(current);
}
}
public static final class ConcatSumMutableReducer extends GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> {
@Override
public void reduce(Iterator<Tuple2<StringValue, IntValue>> values, Collector<Tuple2<StringValue, IntValue>> out) {
Tuple2<StringValue, IntValue> current = values.next();
while (values.hasNext()) {
Tuple2<StringValue, IntValue> next = values.next();
next.f0.append(current.f0);
next.f1.setValue(current.f1.getValue() + next.f1.getValue());
current = next;
}
out.collect(current);
}
}
}