/*
* 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 java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.flink.api.common.functions.BroadcastVariableInitializer;
import org.apache.flink.api.common.functions.RichGroupReduceFunction;
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.IterativeDataSet;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.test.util.JavaProgramTestBase;
import org.apache.flink.util.Collector;
import org.junit.Assert;
@SuppressWarnings("serial")
public class BroadcastVarInitializationITCase extends JavaProgramTestBase {
@Override
protected void testProgram() throws Exception {
ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
env.setDegreeOfParallelism(4);
DataSet<Integer> data = env.fromElements(1, 2, 3, 4, 5, 6, 7, 8);
IterativeDataSet<Integer> iteration = data.iterate(10);
DataSet<Integer> result = data.reduceGroup(new PickOneAllReduce()).withBroadcastSet(iteration, "bc");
final List<Integer> resultList = new ArrayList<Integer>();
iteration.closeWith(result).output(new LocalCollectionOutputFormat<Integer>(resultList));
env.execute();
Assert.assertEquals(8, resultList.get(0).intValue());
}
public static class PickOneAllReduce extends RichGroupReduceFunction<Integer, Integer> {
private Integer bcValue;
@Override
public void open(Configuration parameters) {
this.bcValue = getRuntimeContext().getBroadcastVariableWithInitializer("bc", new PickFirstInitializer());
}
@Override
public void reduce(Iterable<Integer> records, Collector<Integer> out) {
if (bcValue == null) {
return;
}
final int x = bcValue;
for (Integer y : records) {
if (y > x) {
out.collect(y);
return;
}
}
out.collect(bcValue);
}
}
public static class PickFirstInitializer implements BroadcastVariableInitializer<Integer, Integer> {
@Override
public Integer initializeBroadcastVariable(Iterable<Integer> data) {
Iterator<Integer> iter = data.iterator();
return iter.hasNext() ? iter.next() : null;
}
}
}