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StreamFlatMapTest.java
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/
StreamFlatMapTest.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,
* 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.streaming.api.operators;
import java.util.concurrent.ConcurrentLinkedQueue;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.RichFlatMapFunction;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
import org.apache.flink.streaming.util.TestHarnessUtil;
import org.apache.flink.util.Collector;
import org.junit.Assert;
import org.junit.Test;
/**
* Tests for {@link StreamMap}. These test that:
*
* <ul>
* <li>RichFunction methods are called correctly</li>
* <li>Timestamps of processed elements match the input timestamp</li>
* <li>Watermarks are correctly forwarded</li>
* </ul>
*/
public class StreamFlatMapTest {
public static final class MyFlatMap implements FlatMapFunction<Integer, Integer> {
private static final long serialVersionUID = 1L;
@Override
public void flatMap(Integer value, Collector<Integer> out) throws Exception {
if (value % 2 == 0) {
out.collect(value);
out.collect(value * value);
}
}
}
@Test
public void testFlatMap() throws Exception {
StreamFlatMap<Integer, Integer> operator = new StreamFlatMap<Integer, Integer>(new MyFlatMap());
OneInputStreamOperatorTestHarness<Integer, Integer> testHarness = new OneInputStreamOperatorTestHarness<Integer, Integer>(operator);
long initialTime = 0L;
ConcurrentLinkedQueue<Object> expectedOutput = new ConcurrentLinkedQueue<Object>();
testHarness.open();
testHarness.processElement(new StreamRecord<Integer>(1, initialTime + 1));
testHarness.processElement(new StreamRecord<Integer>(2, initialTime + 2));
testHarness.processWatermark(new Watermark(initialTime + 2));
testHarness.processElement(new StreamRecord<Integer>(3, initialTime + 3));
testHarness.processElement(new StreamRecord<Integer>(4, initialTime + 4));
testHarness.processElement(new StreamRecord<Integer>(5, initialTime + 5));
testHarness.processElement(new StreamRecord<Integer>(6, initialTime + 6));
testHarness.processElement(new StreamRecord<Integer>(7, initialTime + 7));
testHarness.processElement(new StreamRecord<Integer>(8, initialTime + 8));
expectedOutput.add(new StreamRecord<Integer>(2, initialTime + 2));
expectedOutput.add(new StreamRecord<Integer>(4, initialTime + 2));
expectedOutput.add(new Watermark(initialTime + 2));
expectedOutput.add(new StreamRecord<Integer>(4, initialTime + 4));
expectedOutput.add(new StreamRecord<Integer>(16, initialTime + 4));
expectedOutput.add(new StreamRecord<Integer>(6, initialTime + 6));
expectedOutput.add(new StreamRecord<Integer>(36, initialTime + 6));
expectedOutput.add(new StreamRecord<Integer>(8, initialTime + 8));
expectedOutput.add(new StreamRecord<Integer>(64, initialTime + 8));
TestHarnessUtil.assertOutputEquals("Output was not correct.", expectedOutput, testHarness.getOutput());
}
@Test
public void testOpenClose() throws Exception {
StreamFlatMap<String, String> operator = new StreamFlatMap<String, String>(new TestOpenCloseFlatMapFunction());
OneInputStreamOperatorTestHarness<String, String> testHarness = new OneInputStreamOperatorTestHarness<String, String>(operator);
long initialTime = 0L;
testHarness.open();
testHarness.processElement(new StreamRecord<String>("Hello", initialTime));
testHarness.close();
Assert.assertTrue("RichFunction methods where not called.", TestOpenCloseFlatMapFunction.closeCalled);
Assert.assertTrue("Output contains no elements.", testHarness.getOutput().size() > 0);
}
// This must only be used in one test, otherwise the static fields will be changed
// by several tests concurrently
private static class TestOpenCloseFlatMapFunction extends RichFlatMapFunction<String, String> {
private static final long serialVersionUID = 1L;
public static boolean openCalled = false;
public static boolean closeCalled = false;
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
if (closeCalled) {
Assert.fail("Close called before open.");
}
openCalled = true;
}
@Override
public void close() throws Exception {
super.close();
if (!openCalled) {
Assert.fail("Open was not called before close.");
}
closeCalled = true;
}
@Override
public void flatMap(String value, Collector<String> out) throws Exception {
if (!openCalled) {
Assert.fail("Open was not called before run.");
}
out.collect(value);
}
}
}