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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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package org.apache.flink.optimizer.operators;

import org.apache.flink.api.common.Plan;
import org.apache.flink.api.common.functions.CoGroupFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.utils.DataSetUtils;
import org.apache.flink.optimizer.plan.*;
import org.apache.flink.optimizer.util.CompilerTestBase;
import org.apache.flink.runtime.operators.shipping.ShipStrategyType;
import org.apache.flink.util.Collector;
import org.junit.Test;

import static org.junit.Assert.*;

public class CoGroupWithDistributionTest extends CompilerTestBase {

	@Test
	 public void CoGroupWithSameDistributionTest() throws Exception {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple3<Integer, Integer, Integer>> set1 = env.readCsvFile(IN_FILE).types(Integer.class, Integer.class, Integer.class);
		DataSet<Tuple3<Integer, Integer, Integer>> set2 = env.readCsvFile(IN_FILE).types(Integer.class, Integer.class, Integer.class);

		TestDistribution testDistribution1 = new TestDistribution(3);
		TestDistribution testDistribution2 = new TestDistribution(3);

		DataSet<Tuple3<Integer, Integer, Integer>> coGrouped = DataSetUtils.partitionByRange(set1, testDistribution1, 0)
				.coGroup(DataSetUtils.partitionByRange(set2, testDistribution2, 0))
				.where(0).equalTo(0).with(new CoGroupFunc());

		coGrouped.output(new DiscardingOutputFormat<Tuple3<Integer, Integer, Integer>>());
		Plan plan = env.createProgramPlan();
		OptimizedPlan oPlan = compileWithStats(plan);

		SinkPlanNode sink = oPlan.getDataSinks().iterator().next();
		DualInputPlanNode coGroup= (DualInputPlanNode)sink.getInput().getSource();
		Channel input1 = coGroup.getInput1();
		Channel input2 = coGroup.getInput2();
		assertEquals(ShipStrategyType.FORWARD, input1.getShipStrategy());
		assertEquals(ShipStrategyType.FORWARD, input2.getShipStrategy());

	}

	@Test
	public void CoGroupWithDifferentDistributionTest() throws Exception {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple3<Integer, Integer, Integer>> set1 = env.readCsvFile(IN_FILE).types(Integer.class, Integer.class, Integer.class);
		DataSet<Tuple3<Integer, Integer, Integer>> set2 = env.readCsvFile(IN_FILE).types(Integer.class, Integer.class, Integer.class);

		TestDistribution testDistribution1 = new TestDistribution(3);
		TestDistribution testDistribution2 = new TestDistribution(2);

		DataSet<Tuple3<Integer, Integer, Integer>> coGrouped = DataSetUtils.partitionByRange(set1, testDistribution1, 0)
				.coGroup(DataSetUtils.partitionByRange(set2, testDistribution2, 0))
				.where(0).equalTo(0).with(new CoGroupFunc());

		coGrouped.output(new DiscardingOutputFormat<Tuple3<Integer, Integer, Integer>>());
		Plan plan = env.createProgramPlan();
		OptimizedPlan oPlan = compileWithStats(plan);

		SinkPlanNode sink = oPlan.getDataSinks().iterator().next();
		DualInputPlanNode coGroup= (DualInputPlanNode)sink.getInput().getSource();
		Channel input1 = coGroup.getInput1();
		Channel input2 = coGroup.getInput2();
		assertEquals(ShipStrategyType.PARTITION_HASH, input1.getShipStrategy());
		assertEquals(ShipStrategyType.PARTITION_HASH, input2.getShipStrategy());

	}

	public static class CoGroupFunc implements CoGroupFunction<Tuple3<Integer, Integer, Integer>,
			Tuple3<Integer, Integer, Integer>, Tuple3<Integer, Integer, Integer>> {

		@Override
		public void coGroup(Iterable<Tuple3<Integer, Integer, Integer>> first, Iterable<Tuple3<Integer, Integer, Integer>> second,
							Collector<Tuple3<Integer, Integer, Integer>> out) throws Exception {

		}
	}
}