/*
* 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.api.common.operators;
import static org.junit.Assert.*;
import org.apache.flink.api.common.JobExecutionResult;
import org.apache.flink.api.common.accumulators.IntCounter;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.java.CollectionEnvironment;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.DiscardingOuputFormat;
import org.apache.flink.configuration.Configuration;
import org.junit.Test;
public class CollectionExecutionAccumulatorsTest {
private static final String ACCUMULATOR_NAME = "TEST ACC";
@Test
public void testAccumulator() {
try {
final int NUM_ELEMENTS = 100;
ExecutionEnvironment env = new CollectionEnvironment();
env.generateSequence(1, NUM_ELEMENTS)
.map(new CountingMapper())
.output(new DiscardingOuputFormat<Long>());
JobExecutionResult result = env.execute();
assertTrue(result.getNetRuntime() >= 0);
assertEquals(NUM_ELEMENTS, result.getAccumulatorResult(ACCUMULATOR_NAME));
}
catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@SuppressWarnings("serial")
public static class CountingMapper extends RichMapFunction<Long, Long> {
private IntCounter accumulator;
@Override
public void open(Configuration parameters) {
accumulator = getRuntimeContext().getIntCounter(ACCUMULATOR_NAME);
}
@Override
public Long map(Long value) {
accumulator.add(1);
return value;
}
}
}