flink-tests/src/test/java/org/apache/flink/test/broadcastvars/BroadcastUnionITCase.java

/*
 * 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.flink.test.broadcastvars;

import org.apache.flink.api.common.functions.ReduceFunction;
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.configuration.Configuration;
import org.apache.flink.test.util.JavaProgramTestBase;

import org.junit.Assert;

import java.util.List;

/** Test broadcast input after union. */
public class BroadcastUnionITCase extends JavaProgramTestBase {
    private static final String BC_NAME = "bc";

    @Override
    protected void testProgram() throws Exception {
        ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(4);

        DataSet<Long> input = env.generateSequence(1, 10);
        DataSet<Long> bc1 = env.generateSequence(1, 5);
        DataSet<Long> bc2 = env.generateSequence(6, 10);

        List<Long> result =
                input.map(new Mapper())
                        .withBroadcastSet(bc1.union(bc2), BC_NAME)
                        .reduce(new Reducer())
                        .collect();

        Assert.assertEquals(Long.valueOf(3025), result.get(0));
    }

    private static class Mapper extends RichMapFunction<Long, Long> {
        private List<Long> values;

        @Override
        public void open(Configuration config) {
            values = getRuntimeContext().getBroadcastVariable(BC_NAME);
        }

        @Override
        public Long map(Long value) throws Exception {
            long sum = 0;
            for (Long v : values) {
                sum += value * v;
            }
            return sum;
        }
    }

    private static class Reducer implements ReduceFunction<Long> {
        @Override
        public Long reduce(Long value1, Long value2) throws Exception {
            return value1 + value2;
        }
    }
}