flink-tests/src/test/java/org/apache/flink/test/iterative/DeltaIterationNotDependingOnSolutionSetITCase.java

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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
 *
 *     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,
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 * See the License for the specific language governing permissions and
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package org.apache.flink.test.iterative;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.LocalCollectionOutputFormat;
import org.apache.flink.api.java.operators.DeltaIteration;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.test.util.JavaProgramTestBase;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

/** Test delta iterations that do not join with the solution set. */
@SuppressWarnings("serial")
public class DeltaIterationNotDependingOnSolutionSetITCase extends JavaProgramTestBase {
    private final List<Tuple2<Long, Long>> result = new ArrayList<>();

    @Override
    protected void testProgram() throws Exception {
        try {
            ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
            env.setParallelism(1);

            DataSet<Tuple2<Long, Long>> input =
                    env.generateSequence(0, 9).map(new Duplicator<Long>());

            DeltaIteration<Tuple2<Long, Long>, Tuple2<Long, Long>> iteration =
                    input.iterateDelta(input, 5, 1);

            iteration
                    .closeWith(iteration.getWorkset(), iteration.getWorkset().map(new TestMapper()))
                    .output(new LocalCollectionOutputFormat<Tuple2<Long, Long>>(result));

            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Override
    protected void postSubmit() {
        boolean[] present = new boolean[50];
        for (Tuple2<Long, Long> t : result) {
            present[t.f0.intValue()] = true;
        }

        for (int i = 0; i < present.length; i++) {
            assertTrue(String.format("Missing tuple (%d, %d)", i, i), present[i]);
        }
    }

    private static final class Duplicator<T> implements MapFunction<T, Tuple2<T, T>> {
        @Override
        public Tuple2<T, T> map(T value) {
            return new Tuple2<T, T>(value, value);
        }
    }

    private static final class TestMapper
            extends RichMapFunction<Tuple2<Long, Long>, Tuple2<Long, Long>> {
        @Override
        public Tuple2<Long, Long> map(Tuple2<Long, Long> value) {
            return new Tuple2<>(value.f0 + 10, value.f1 + 10);
        }
    }
}