--- /dev/null
+FROM openjdk:11-jre
+VOLUME /tmp
+COPY target/*.jar /opt/app.jar
+COPY target/dependency /opt/libs
+ENTRYPOINT [ "java", "-jar", "/opt/app.jar", "kafka:9092", "test" ]
+CMD [ "DCKR" ]
#!/bin/bash
+IMAGE=juplo/simple-producer:1.0-SNAPSHOT
+
if [ "$1" = "cleanup" ]
then
docker-compose down -v
exit
fi
-mvn package || exit 1
-if [ "$1" = "build" ]; then exit; fi
-
-trap 'kill $(jobs -p) 2>/dev/null' EXIT
+docker-compose up -d zookeeper kafka-1 kafka-2 kafka-3 cli
-docker-compose up -d
+if [[
+ $(docker image ls -q $IMAGE) == "" ||
+ "$1" = "build"
+]]
+then
+ mvn install || exit
+else
+ echo "Using image existing images:"
+ docker image ls $IMAGE
+fi
echo "Waiting for the Kafka-Cluster to become ready..."
docker-compose exec cli cub kafka-ready -b kafka:9092 1 60 > /dev/null 2>&1 || exit 1
+docker-compose up setup
+docker-compose up -d
+sleep 5
-echo "Producing messages"
-mvn exec:java@producer
-
-echo "Reading messages"
-mvn exec:java@consumer &
-sleep 7
-kill $(jobs -p)
-sleep 2
+docker-compose exec cli kafkacat -b kafka:9092 -t test -q -c 20 -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
-echo "Re-Reading messages"
-mvn exec:java@consumer &
-sleep 7
-kill $(jobs -p)
-sleep 2
+docker-compose stop producer
+docker-compose exec cli kafkacat -b kafka:9092 -t test -q -e -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
+docker-compose logs producer
ports:
- 2181:2181
- kafka:
+ kafka-1:
image: confluentinc/cp-kafka:7.1.3
environment:
KAFKA_BROKER_ID: 1
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+ KAFKA_LISTENERS: DOCKER://:9092, LOCALHOST://:9081
+ KAFKA_ADVERTISED_LISTENERS: DOCKER://kafka-1:9092, LOCALHOST://localhost:9081
+ KAFKA_INTER_BROKER_LISTENER_NAME: DOCKER
+ KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: DOCKER:PLAINTEXT, LOCALHOST:PLAINTEXT
+ KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 3
+ KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"
+ ports:
+ - 9081:9081
+ depends_on:
+ - zookeeper
+
+ kafka-2:
+ image: confluentinc/cp-kafka:7.1.3
+ environment:
+ KAFKA_BROKER_ID: 2
+ KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
KAFKA_LISTENERS: DOCKER://:9092, LOCALHOST://:9082
- KAFKA_ADVERTISED_LISTENERS: DOCKER://kafka:9092, LOCALHOST://localhost:9082
+ KAFKA_ADVERTISED_LISTENERS: DOCKER://kafka-2:9092, LOCALHOST://localhost:9082
KAFKA_INTER_BROKER_LISTENER_NAME: DOCKER
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: DOCKER:PLAINTEXT, LOCALHOST:PLAINTEXT
- KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+ KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 3
KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"
ports:
- 9092:9082
- 9082:9082
+ networks:
+ default:
+ aliases:
+ - kafka
+ depends_on:
+ - zookeeper
+
+ kafka-3:
+ image: confluentinc/cp-kafka:7.1.3
+ environment:
+ KAFKA_BROKER_ID: 3
+ KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+ KAFKA_LISTENERS: DOCKER://:9092, LOCALHOST://:9083
+ KAFKA_ADVERTISED_LISTENERS: DOCKER://kafka-3:9092, LOCALHOST://localhost:9083
+ KAFKA_INTER_BROKER_LISTENER_NAME: DOCKER
+ KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: DOCKER:PLAINTEXT, LOCALHOST:PLAINTEXT
+ KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 3
+ KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"
+ ports:
+ - 9083:9083
depends_on:
- zookeeper
command: >
bash -c "
kafka-topics --bootstrap-server kafka:9092 --delete --if-exists --topic test
- kafka-topics --bootstrap-server kafka:9092 --create --topic test --partitions 2
+ kafka-topics --bootstrap-server kafka:9092 --create --topic test --partitions 2 --replication-factor 3 --config min.insync.replicas=2
+ kafka-topics --bootstrap-server kafka:9092 --describe --topic test
"
cli:
image: juplo/toolbox
command: sleep infinity
+
+ producer:
+ image: juplo/simple-producer:1.0-SNAPSHOT
+ command: producer
</parent>
<groupId>de.juplo.kafka</groupId>
- <artifactId>first-contact</artifactId>
- <name>First Contact: a Simple Producer and a simple Consumer-Group</name>
+ <artifactId>simple-producer</artifactId>
+ <name>Super Simple Producer</name>
<version>1.0-SNAPSHOT</version>
<dependencies>
<build>
<plugins>
<plugin>
- <groupId>org.codehaus.mojo</groupId>
- <artifactId>exec-maven-plugin</artifactId>
- <version>3.0.0</version>
+ <groupId>pl.project13.maven</groupId>
+ <artifactId>git-commit-id-plugin</artifactId>
+ </plugin>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
- <id>producer</id>
+ <id>copy-dependencies</id>
+ <phase>package</phase>
+ <goals>
+ <goal>copy-dependencies</goal>
+ </goals>
<configuration>
- <mainClass>de.juplo.kafka.SimpleProducer</mainClass>
+ <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.SimpleProducer</mainClass>
+ </manifest>
+ </archive>
+ </configuration>
+ </plugin>
+ <plugin>
+ <groupId>io.fabric8</groupId>
+ <artifactId>docker-maven-plugin</artifactId>
+ <version>0.33.0</version>
+ <configuration>
+ <images>
+ <image>
+ <name>juplo/%a:%v</name>
+ </image>
+ </images>
+ </configuration>
+ <executions>
<execution>
- <id>consumer</id>
- <configuration>
- <mainClass>de.juplo.kafka.SimpleConsumer</mainClass>
- </configuration>
+ <id>build</id>
+ <phase>package</phase>
+ <goals>
+ <goal>build</goal>
+ </goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
+
</project>
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.ConsumerRecords;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
-import org.apache.kafka.common.errors.WakeupException;
-import org.apache.kafka.common.serialization.StringDeserializer;
-
-import java.time.Duration;
-import java.util.Arrays;
-import java.util.Properties;
-import java.util.concurrent.locks.Condition;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
-
-
-@Slf4j
-public class SimpleConsumer
-{
- private long consumed = 0;
- private KafkaConsumer<String, String> consumer;
- private Lock lock = new ReentrantLock();
- private Condition stopped = lock.newCondition();
-
-
- public SimpleConsumer()
- {
- // tag::create[]
- Properties props = new Properties();
- props.put("bootstrap.servers", ":9092");
- props.put("group.id", "my-consumer"); // << Used for Offset-Commits
- // end::create[]
- props.put("auto.offset.reset", "earliest");
- // tag::create[]
- props.put("key.deserializer", StringDeserializer.class.getName());
- props.put("value.deserializer", StringDeserializer.class.getName());
-
- KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
- // end::create[]
- this.consumer = consumer;
- }
-
-
- public void run()
- {
- String id = "C";
-
- try
- {
- log.info("{} - Subscribing to topic test", id);
- consumer.subscribe(Arrays.asList("test"));
-
- // tag::loop[]
- while (true)
- {
- ConsumerRecords<String, String> records =
- consumer.poll(Duration.ofSeconds(1));
-
- // Do something with the data...
- // end::loop[]
- log.info("{} - Received {} messages", id, records.count());
- for (ConsumerRecord<String, String> record : records)
- {
- consumed++;
- log.info(
- "{} - {}: {}/{} - {}={}",
- id,
- record.offset(),
- record.topic(),
- record.partition(),
- record.key(),
- record.value()
- );
- }
- // tag::loop[]
- }
- // end::loop[]
- }
- catch(WakeupException e)
- {
- log.info("{} - RIIING!", id);
- }
- catch(Exception e)
- {
- log.error("{} - Unexpected error: {}", id, e.toString());
- }
- finally
- {
- this.lock.lock();
- try
- {
- log.info("{} - Closing the KafkaConsumer", id);
- consumer.close();
- log.info("C - DONE!");
- stopped.signal();
- }
- finally
- {
- this.lock.unlock();
- log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
- }
- }
- }
-
-
- public static void main(String[] args) throws Exception
- {
- SimpleConsumer instance = new SimpleConsumer();
-
- Runtime.getRuntime().addShutdownHook(new Thread(() ->
- {
- instance.lock.lock();
- try
- {
- instance.consumer.wakeup();
- instance.stopped.await();
- }
- catch (InterruptedException e)
- {
- log.warn("Interrrupted while waiting for the consumer to stop!", e);
- }
- finally
- {
- instance.lock.unlock();
- }
- }));
-
- instance.run();
- }
-}
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
@Slf4j
private final KafkaProducer<String, String> producer;
private long produced = 0;
+ private volatile boolean running = true;
+ private volatile boolean done = false;
- public SimpleProducer(String clientId, String topic)
+ public SimpleProducer(String broker, String topic, String id)
{
- // tag::create[]
Properties props = new Properties();
- props.put("bootstrap.servers", "localhost:9092");
+ props.put("bootstrap.servers", broker);
+ props.put("client.id", id); // Nur zur Wiedererkennung
props.put("key.serializer", StringSerializer.class.getName());
props.put("value.serializer", StringSerializer.class.getName());
- KafkaProducer<String, String> producer = new KafkaProducer<>(props);
- // end::create[]
+ producer = new KafkaProducer<>(props);
- this.id = clientId;
this.topic = topic;
- this.producer = producer;
+ this.id = id;
}
public void run()
try
{
- for (; i < 100 ; i++)
+ for (; running ; i++)
{
send(Long.toString(i%10), Long.toString(i));
+ Thread.sleep(500);
}
-
- log.info("{} - Done", id);
}
+ catch (InterruptedException e) {}
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
{
- SimpleProducer producer = new SimpleProducer("P", "test");
+ 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];
+ }
+
+ SimpleProducer producer = new SimpleProducer(broker, topic, clientId);
+
+ Runtime.getRuntime().addShutdownHook(new Thread(() ->
+ {
+ producer.running = false;
+ while (!producer.done)
+ {
+ log.info("Waiting for producer...");
+ try
+ {
+ Thread.sleep(1000);
+ }
+ catch (InterruptedException e) {}
+ }
+ log.info("Shutdown completed.");
+ }));
+
+ log.info(
+ "Running simple producer: broker={}, topic={}, client-id={}",
+ broker,
+ topic,
+ clientId);
producer.run();
}
}
projects / demos / kafka / training / commitdiff