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[BAEL-4907] - Add the tests to libraries-data-3 (#10848)

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Carlos Cavero 2021-06-01 05:15:20 +02:00 committed by GitHub
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libraries-data-3/README.md Normal file
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## Data Libraries
This module contains articles about libraries for data processing in Java.
### Relevant articles
- [Kafka Streams vs Kafka Consumer]()
- More articles: [[<-- prev]](/../libraries-data-2)
##### Building the project
You can build the project from the command line using: *mvn clean install*, or in an IDE. If you have issues with the derive4j imports in your IDE, you have to add the folder: *target/generated-sources/annotations* to the project build path in your IDE.

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log4j.rootLogger=INFO, stdout

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libraries-data-3/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>libraries-data-3</artifactId>
<name>libraries-data-3</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>${kafka.version}</version>
<classifier>test</classifier>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
<version>${kafka.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>kafka</artifactId>
<version>${testcontainers-kafka.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<assertj.version>3.6.2</assertj.version>
<slf4j.version>1.7.25</slf4j.version>
<kafka.version>2.8.0</kafka.version>
<testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
</properties>
</project>

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libraries-data-3/src/test/java/com/baeldung/kafka/streams/KafkaStreamsLiveTest.java Normal file
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package com.baeldung.kafka.streams;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StoreQueryParameters;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.Topology;
import org.apache.kafka.streams.kstream.Consumed;
import org.apache.kafka.streams.kstream.Grouped;
import org.apache.kafka.streams.kstream.JoinWindows;
import org.apache.kafka.streams.kstream.KGroupedStream;
import org.apache.kafka.streams.kstream.KGroupedTable;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.KTable;
import org.apache.kafka.streams.kstream.Materialized;
import org.apache.kafka.streams.kstream.Produced;
import org.apache.kafka.streams.kstream.TimeWindows;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.KeyValueStore;
import org.apache.kafka.streams.state.QueryableStoreTypes;
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
import org.apache.kafka.streams.state.StoreBuilder;
import org.apache.kafka.streams.state.Stores;
import org.apache.kafka.streams.state.WindowStore;
import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.testcontainers.containers.KafkaContainer;
import org.testcontainers.utility.DockerImageName;
import java.time.Duration;
import java.util.Arrays;
import java.util.Locale;
import java.util.Properties;
import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG;
public class KafkaStreamsLiveTest {
private final String LEFT_TOPIC = "left-stream-topic";
private final String RIGHT_TOPIC = "right-stream-topic";
private final String LEFT_RIGHT_TOPIC = "left-right-stream-topic";
private KafkaProducer<String, String> producer = createKafkaProducer();
private Properties streamsConfiguration = new Properties();
static final String TEXT_LINES_TOPIC = "TextLinesTopic";
private final String TEXT_EXAMPLE_1 = "test test and test";
private final String TEXT_EXAMPLE_2 = "test filter filter this sentence";
@ClassRule
public static KafkaContainer kafka = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
@Before
public void setUp() {
streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 1000);
streamsConfiguration.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
}
@Test
public void shouldTestKafkaTableLatestWord() throws InterruptedException {
String inputTopic = "topicTable";
final StreamsBuilder builder = new StreamsBuilder();
KTable<String, String> textLinesTable = builder.table(inputTopic,
Consumed.with(Serdes.String(), Serdes.String()));
textLinesTable.toStream().foreach((word, count) -> System.out.println("Latest word: " + word + " -> " + count));
final Topology topology = builder.build();
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "latest-word-id");
KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(inputTopic, "1", TEXT_EXAMPLE_1));
producer.send(new ProducerRecord<String, String>(inputTopic, "2", TEXT_EXAMPLE_2));
Thread.sleep(2000);
streams.close();
}
@Test
public void shouldTestWordCountKafkaStreams() throws InterruptedException {
String wordCountTopic = "wordCountTopic";
final StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> textLines = builder.stream(wordCountTopic,
Consumed.with(Serdes.String(), Serdes.String()));
KTable<String, Long> wordCounts = textLines
.flatMapValues(value -> Arrays.asList(value.toLowerCase(Locale.ROOT)
.split("\\W+")))
.groupBy((key, word) -> word)
.count(Materialized.<String, Long, KeyValueStore<Bytes, byte[]>> as("counts-store"));
wordCounts.toStream().foreach((word, count) -> System.out.println("Word: " + word + " -> " + count));
wordCounts.toStream().to("outputTopic",
Produced.with(Serdes.String(), Serdes.Long()));
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-stream-table-id");
final Topology topology = builder.build();
KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(wordCountTopic, "1", TEXT_EXAMPLE_1));
producer.send(new ProducerRecord<String, String>(wordCountTopic, "2", TEXT_EXAMPLE_2));
Thread.sleep(2000);
streams.close();
}
// Filter, map
@Test
public void shouldTestStatelessTransformations() throws InterruptedException {
String wordCountTopic = "wordCountTopic";
//when
final StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> textLines = builder.stream(wordCountTopic,
Consumed.with(Serdes.String(), Serdes.String()));
final KStream<String, String> textLinesUpperCase =
textLines
.map((key, value) -> KeyValue.pair(value, value.toUpperCase()))
.filter((key, value) -> value.contains("FILTER"));
KTable<String, Long> wordCounts = textLinesUpperCase
.flatMapValues(value -> Arrays.asList(value.split("\\W+")))
.groupBy((key, word) -> word)
.count(Materialized.<String, Long, KeyValueStore<Bytes, byte[]>> as("counts-store"));
wordCounts.toStream().foreach((word, count) -> System.out.println("Word: " + word + " -> " + count));
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-filter-map-id");
final Topology topology = builder.build();
KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(wordCountTopic, "1", TEXT_EXAMPLE_1));
producer.send(new ProducerRecord<String, String>(wordCountTopic, "2", TEXT_EXAMPLE_2));
Thread.sleep(2000);
streams.close();
}
@Test
public void shouldTestAggregationStatefulTransformations() throws InterruptedException {
String aggregationTopic = "aggregationTopic";
final StreamsBuilder builder = new StreamsBuilder();
final KStream<byte[], String> input = builder.stream(aggregationTopic,
Consumed.with(Serdes.ByteArray(), Serdes.String()));
final KTable<String, Long> aggregated = input
.groupBy((key, value) -> (value != null && value.length() > 0) ? value.substring(0, 2).toLowerCase() : "",
Grouped.with(Serdes.String(), Serdes.String()))
.aggregate(() -> 0L, (aggKey, newValue, aggValue) -> aggValue + newValue.length(),
Materialized.with(Serdes.String(), Serdes.Long()));
aggregated.toStream().foreach((word, count) -> System.out.println("Word: " + word + " -> " + count));
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "aggregation-id");
final Topology topology = builder.build();
KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(aggregationTopic, "1", "one"));
producer.send(new ProducerRecord<String, String>(aggregationTopic, "2", "two"));
producer.send(new ProducerRecord<String, String>(aggregationTopic, "3", "three"));
producer.send(new ProducerRecord<String, String>(aggregationTopic, "4", "four"));
producer.send(new ProducerRecord<String, String>(aggregationTopic, "5", "five"));
Thread.sleep(5000);
streams.close();
}
@Test
public void shouldTestWindowingJoinStatefulTransformations() throws InterruptedException {
final StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> leftSource = builder.stream(LEFT_TOPIC);
KStream<String, String> rightSource = builder.stream(RIGHT_TOPIC);
KStream<String, String> leftRightSource = leftSource.outerJoin(rightSource,
(leftValue, rightValue) -> "left=" + leftValue + ", right=" + rightValue,
JoinWindows.of(Duration.ofSeconds(5)))
.groupByKey()
.reduce(((key, lastValue) -> lastValue))
.toStream();
leftRightSource.foreach((key, value) -> System.out.println("(key= " + key + ") -> (" + value + ")"));
final Topology topology = builder.build();
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "windowing-join-id");
KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(LEFT_TOPIC, "1", "left"));
producer.send(new ProducerRecord<String, String>(RIGHT_TOPIC, "2", "right"));
Thread.sleep(2000);
streams.close();
}
@Test
public void shouldTestWordCountWithInteractiveQueries() throws InterruptedException {
final Serde<String> stringSerde = Serdes.String();
final StreamsBuilder builder = new StreamsBuilder();
final KStream<String, String>
textLines = builder.stream(TEXT_LINES_TOPIC, Consumed.with(Serdes.String(), Serdes.String()));
final KGroupedStream<String, String> groupedByWord = textLines
.flatMapValues(value -> Arrays.asList(value.toLowerCase().split("\\W+")))
.groupBy((key, word) -> word, Grouped.with(stringSerde, stringSerde));
groupedByWord.count(Materialized.<String, Long, KeyValueStore<Bytes, byte[]>>as("WordCountsStore")
.withValueSerde(Serdes.Long()));
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-interactive-queries");
final KafkaStreams streams = new KafkaStreams(builder.build(), streamsConfiguration);
streams.cleanUp();
streams.start();
producer.send(new ProducerRecord<String, String>(TEXT_LINES_TOPIC, "1", TEXT_EXAMPLE_1));
producer.send(new ProducerRecord<String, String>(TEXT_LINES_TOPIC, "2", TEXT_EXAMPLE_2));
Thread.sleep(2000);
ReadOnlyKeyValueStore<String, Long> keyValueStore =
streams.store(StoreQueryParameters.fromNameAndType(
"WordCountsStore", QueryableStoreTypes.keyValueStore()));
KeyValueIterator<String, Long> range = keyValueStore.all();
while (range.hasNext()) {
KeyValue<String, Long> next = range.next();
System.out.println("Count for " + next.key + ": " + next.value);
}
streams.close();
}
private static KafkaProducer<String, String> createKafkaProducer() {
Properties props = new Properties();
props.put(BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
props.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
props.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
return new KafkaProducer(props);
}
}