| /** |
| * 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.kafka.streams.kstream.internals; |
| |
| import org.apache.kafka.common.serialization.Serdes; |
| import org.apache.kafka.streams.kstream.KStream; |
| import org.apache.kafka.streams.kstream.KStreamBuilder; |
| import org.apache.kafka.streams.KeyValue; |
| import org.apache.kafka.streams.kstream.KeyValueMapper; |
| import org.apache.kafka.test.KStreamTestDriver; |
| import org.apache.kafka.test.MockProcessorSupplier; |
| import org.junit.After; |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import java.util.ArrayList; |
| |
| public class KStreamFlatMapTest { |
| |
| private String topicName = "topic"; |
| |
| private KStreamTestDriver driver = null; |
| |
| @After |
| public void cleanup() { |
| if (driver != null) { |
| driver.close(); |
| } |
| driver = null; |
| } |
| |
| @Test |
| public void testFlatMap() { |
| KStreamBuilder builder = new KStreamBuilder(); |
| |
| KeyValueMapper<Integer, String, Iterable<KeyValue<String, String>>> mapper = |
| new KeyValueMapper<Integer, String, Iterable<KeyValue<String, String>>>() { |
| @Override |
| public Iterable<KeyValue<String, String>> apply(Integer key, String value) { |
| ArrayList<KeyValue<String, String>> result = new ArrayList<>(); |
| for (int i = 0; i < key; i++) { |
| result.add(KeyValue.pair(Integer.toString(key * 10 + i), value)); |
| } |
| return result; |
| } |
| }; |
| |
| final int[] expectedKeys = {0, 1, 2, 3}; |
| |
| KStream<Integer, String> stream; |
| MockProcessorSupplier<String, String> processor; |
| |
| processor = new MockProcessorSupplier<>(); |
| stream = builder.stream(Serdes.Integer(), Serdes.String(), topicName); |
| stream.flatMap(mapper).process(processor); |
| |
| driver = new KStreamTestDriver(builder); |
| for (int i = 0; i < expectedKeys.length; i++) { |
| driver.process(topicName, expectedKeys[i], "V" + expectedKeys[i]); |
| } |
| |
| assertEquals(6, processor.processed.size()); |
| |
| String[] expected = {"10:V1", "20:V2", "21:V2", "30:V3", "31:V3", "32:V3"}; |
| |
| for (int i = 0; i < expected.length; i++) { |
| assertEquals(expected[i], processor.processed.get(i)); |
| } |
| } |
| |
| } |