*
!target/*.jar
-!target/libs/*.jar
target/*.jar
-target/libs/*.jar
FROM eclipse-temurin:21-jre
VOLUME /tmp
COPY target/*.jar /opt/app.jar
-COPY target/libs /opt/libs
ENTRYPOINT [ "java", "-jar", "/opt/app.jar" ]
-CMD [ "kafka:9092", "test", "DCKR" ]
+CMD []
#!/bin/bash
-IMAGE=juplo/simple-producer:1.0-SNAPSHOT
+IMAGE=juplo/spring-producer:1.0-SNAPSHOT
if [ "$1" = "cleanup" ]
then
docker compose -f docker/docker-compose.yml up -d producer
-sleep 5
-
-docker compose -f docker/docker-compose.yml exec cli kafkacat -b kafka:9092 -t test -c 20 -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
+docker compose -f docker/docker-compose.yml up -d consumer-1 consumer-2
+sleep 15
docker compose -f docker/docker-compose.yml stop producer
-docker compose -f docker/docker-compose.yml exec cli kafkacat -b kafka:9092 -t test -e -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
-docker compose -f docker/docker-compose.yml logs producer
+
+echo
+echo "Von consumer-1 empfangen:"
+docker compose -f docker/docker-compose.yml logs consumer-1 | grep '\ test\/.'
+echo
+echo "Von consumer-2 empfangen:"
+docker compose -f docker/docker-compose.yml logs consumer-2 | grep '\ test\/.'
+
+docker compose -f docker/docker-compose.yml stop consumer-1 consumer-2
- kafka-3
producer:
- image: juplo/simple-producer:1.0-SNAPSHOT
- command: kafka:9092 test producer
+ image: juplo/spring-producer:1.0-SNAPSHOT
+ environment:
+ producer.bootstrap-server: kafka:9092
+ producer.client-id: producer
+ producer.topic: test
+
+ consumer-1:
+ image: juplo/simple-consumer:1.0-SNAPSHOT
+ command: kafka:9092 test my-group consumer-1
+
+ consumer-2:
+ image: juplo/simple-consumer:1.0-SNAPSHOT
+ command: kafka:9092 test my-group consumer-2
volumes:
zookeeper-data:
</parent>
<groupId>de.juplo.kafka</groupId>
- <artifactId>simple-producer</artifactId>
- <name>Super Simple Producer</name>
- <description>A Simple Producer, programmed with pure Java, that sends messages via Kafka</description>
+ <artifactId>spring-producer</artifactId>
+ <name>Spring Producer</name>
+ <description>A Simple Spring-Boot-Producer, that takes messages via POST and confirms successs</description>
<version>1.0-SNAPSHOT</version>
<properties>
</properties>
<dependencies>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-configuration-processor</artifactId>
+ <optional>true</optional>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-validation</artifactId>
+ </dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
- <groupId>ch.qos.logback</groupId>
- <artifactId>logback-classic</artifactId>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-test</artifactId>
+ <scope>test</scope>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.kafka</groupId>
+ <artifactId>spring-kafka</artifactId>
+ <scope>test</scope>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.kafka</groupId>
+ <artifactId>spring-kafka-test</artifactId>
+ <scope>test</scope>
+ </dependency>
+ <dependency>
+ <groupId>org.awaitility</groupId>
+ <artifactId>awaitility</artifactId>
+ <scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-dependency-plugin</artifactId>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
- <id>copy-dependencies</id>
- <phase>package</phase>
<goals>
- <goal>copy-dependencies</goal>
+ <goal>build-info</goal>
</goals>
- <configuration>
- <outputDirectory>${project.build.directory}/libs</outputDirectory>
- </configuration>
</execution>
</executions>
</plugin>
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-jar-plugin</artifactId>
- <configuration>
- <archive>
- <manifest>
- <addClasspath>true</addClasspath>
- <classpathPrefix>libs/</classpathPrefix>
- <mainClass>de.juplo.kafka.ExampleProducer</mainClass>
- </manifest>
- </archive>
- </configuration>
- </plugin>
<plugin>
<groupId>pl.project13.maven</groupId>
<artifactId>git-commit-id-plugin</artifactId>
--- /dev/null
+package de.juplo.kafka;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+
+@SpringBootApplication
+public class Application
+{
+ public static void main(String[] args)
+ {
+ SpringApplication.run(Application.class, args);
+ }
+}
--- /dev/null
+package de.juplo.kafka;
+
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Properties;
+
+
+@Configuration
+@EnableConfigurationProperties(ApplicationProperties.class)
+public class ApplicationConfiguration
+{
+ @Bean
+ public ExampleProducer exampleProducer(
+ ApplicationProperties properties,
+ KafkaProducer<String, String> kafkaProducer)
+ {
+ return
+ new ExampleProducer(
+ properties.getClientId(),
+ properties.getTopic(),
+ kafkaProducer);
+ }
+
+ @Bean
+ public KafkaProducer<String, String> kafkaProducer(ApplicationProperties properties)
+ {
+ Properties props = new Properties();
+ props.put("bootstrap.servers", properties.getBootstrapServer());
+ props.put("client.id", properties.getClientId());
+ props.put("acks", properties.getAcks());
+ props.put("batch.size", properties.getBatchSize());
+ props.put("metadata.maxage.ms", 5000); // 5 Sekunden
+ props.put("delivery.timeout.ms", 20000); // 20 Sekunden
+ props.put("request.timeout.ms", 10000); // 10 Sekunden
+ props.put("linger.ms", properties.getLingerMs());
+ props.put("compression.type", properties.getCompressionType());
+ props.put("key.serializer", StringSerializer.class.getName());
+ props.put("value.serializer", StringSerializer.class.getName());
+
+ return new KafkaProducer<>(props);
+ }
+}
--- /dev/null
+package de.juplo.kafka;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+
+
+@ConfigurationProperties(prefix = "producer")
+@Getter
+@Setter
+public class ApplicationProperties
+{
+ @NotNull
+ @NotEmpty
+ private String bootstrapServer;
+ @NotNull
+ @NotEmpty
+ private String clientId;
+ @NotNull
+ @NotEmpty
+ private String topic;
+ @NotNull
+ @NotEmpty
+ private String acks;
+ @NotNull
+ private Integer batchSize;
+ @NotNull
+ private Integer lingerMs;
+ @NotNull
+ @NotEmpty
+ private String compressionType;
+}
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.producer.Producer;
-import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.serialization.StringSerializer;
-
-import java.util.Properties;
@Slf4j
-public class ExampleProducer
+public class ExampleProducer implements Runnable
{
private final String id;
private final String topic;
private final Producer<String, String> producer;
+ private final Thread workerThread;
private volatile boolean running = true;
- private volatile boolean done = false;
private long produced = 0;
+
public ExampleProducer(
- String broker,
+ String id,
String topic,
- String clientId)
+ Producer<String, String> producer)
{
- Properties props = new Properties();
- props.put("bootstrap.servers", broker);
- props.put("client.id", clientId); // Nur zur Wiedererkennung
- props.put("key.serializer", StringSerializer.class.getName());
- props.put("value.serializer", StringSerializer.class.getName());
- props.put("metadata.maxage.ms", 5000);
-
- this.id = clientId;
+ this.id = id;
this.topic = topic;
- producer = new KafkaProducer<>(props);
+ this.producer = producer;
+
+ workerThread = new Thread(this, "ExampleProducer Worker-Thread");
+ workerThread.start();
}
+
+ @Override
public void run()
{
long i = 0;
}
finally
{
- log.info("{}: Closing the KafkaProducer", id);
- producer.close();
log.info("{}: Produced {} messages in total, exiting!", id, produced);
- done = true;
}
}
}
- public static void main(String[] args) throws Exception
+ public void shutdown() throws InterruptedException
{
- String broker = ":9092";
- String topic = "test";
- String clientId = "DEV";
-
- switch (args.length)
- {
- case 3:
- clientId = args[2];
- case 2:
- topic = args[1];
- case 1:
- broker = args[0];
- }
-
- ExampleProducer instance = new ExampleProducer(broker, topic, clientId);
-
- Runtime.getRuntime().addShutdownHook(new Thread(() ->
- {
- instance.running = false;
- while (!instance.done)
- {
- log.info("Waiting for main-thread...");
- try
- {
- Thread.sleep(1000);
- }
- catch (InterruptedException e) {}
- }
- log.info("Shutdown completed.");
- }));
-
- log.info(
- "Running ExampleProducer: broker={}, topic={}, client-id={}",
- broker,
- topic,
- clientId);
- instance.run();
+ log.info("{} joining the worker-thread...", id);
+ running = false;
+ workerThread.join();
}
}
--- /dev/null
+producer:
+ bootstrap-server: :9092
+ client-id: DEV
+ topic: test
+ acks: -1
+ batch-size: 16384
+ linger-ms: 0
+ compression-type: gzip
+logging:
+ level:
+ root: INFO
+ de.juplo: TRACE
</encoder>
</appender>
- <logger name="de.juplo" level="TRACE"/>
-
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
--- /dev/null
+package de.juplo.kafka;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.test.context.EmbeddedKafka;
+
+import java.time.Duration;
+import java.util.LinkedList;
+import java.util.List;
+
+import static de.juplo.kafka.ApplicationTests.PARTITIONS;
+import static de.juplo.kafka.ApplicationTests.TOPIC;
+import static org.awaitility.Awaitility.await;
+
+
+@SpringBootTest(
+ properties = {
+ "spring.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}",
+ "spring.kafka.consumer.auto-offset-reset=earliest",
+ "producer.bootstrap-server=${spring.embedded.kafka.brokers}",
+ "producer.topic=" + TOPIC})
+@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
+@Slf4j
+public class ApplicationTests
+{
+ static final String TOPIC = "FOO";
+ static final int PARTITIONS = 10;
+
+ @Autowired
+ Consumer consumer;
+
+
+ @BeforeEach
+ public void clear()
+ {
+ consumer.received.clear();
+ }
+
+
+ @Test
+ public void testApplicationStartup()
+ {
+ }
+
+ @Test
+ public void testSendMessage() throws Exception
+ {
+ await("Some messages were send")
+ .atMost(Duration.ofSeconds(5))
+ .until(() -> consumer.received.size() >= 1);
+ }
+
+
+ static class Consumer
+ {
+ final List<ConsumerRecord<String, String>> received = new LinkedList<>();
+
+ @KafkaListener(groupId = "TEST", topics = TOPIC)
+ public void receive(ConsumerRecord<String, String> record)
+ {
+ log.debug("Received message: {}", record);
+ received.add(record);
+ }
+ }
+
+ @TestConfiguration
+ static class Configuration
+ {
+ @Bean
+ Consumer consumer()
+ {
+ return new Consumer();
+ }
+ }
+}
projects / demos / kafka / training / commitdiff