+++ /dev/null
-*
-!target/*.jar
+++ /dev/null
-target/*.jar
+++ /dev/null
-FROM openjdk:11-jre
-VOLUME /tmp
-COPY target/*.jar /opt/app.jar
-ENTRYPOINT [ "java", "-jar", "/opt/app.jar" ]
-CMD []
#!/bin/bash
-IMAGE=juplo/endless-consumer:1.0-SNAPSHOT
-
if [ "$1" = "cleanup" ]
then
docker-compose down -v
- mvn clean
exit
fi
docker-compose up -d zookeeper kafka cli
-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 producer consumer
-sleep 15
-docker-compose stop producer consumer
-docker-compose logs consumer
+
+docker-compose up -d producer
+docker-compose up -d peter
+sleep 3
+docker-compose up -d franz
+sleep 3
+docker-compose up -d beate
+sleep 3
+docker-compose up -d klaus
+sleep 2
+docker-compose stop franz
+sleep 2
+docker-compose kill -s 9 peter
+sleep 5
+docker-compose stop producer peter franz beate klaus
producer.bootstrap-server: kafka:9092
producer.client-id: producer
producer.topic: test
- producer.throttle-ms: 200
+ producer.throttle-ms: 100
- consumer:
+ peter:
image: juplo/endless-consumer:1.0-SNAPSHOT
ports:
- - 8081:8081
+ - 8081:8080
environment:
+ server.port: 8080
consumer.bootstrap-server: kafka:9092
- consumer.client-id: my-group
- consumer.client-id: consumer
+ consumer.group-id: my-group
+ consumer.client-id: peter
+ consumer.topic: test
+
+ beate:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8082:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.group-id: my-group
+ consumer.client-id: beate
+ consumer.topic: test
+
+ franz:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8083:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.group-id: my-group
+ consumer.client-id: franz
+ consumer.topic: test
+
+ klaus:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8084:8080
+ environment:
+ consumer.bootstrap-server: kafka:9092
+ consumer.group-id: my-group
+ consumer.client-id: klaus
consumer.topic: test
+++ /dev/null
-<?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>
-
- <parent>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-parent</artifactId>
- <version>2.6.5</version>
- <relativePath/> <!-- lookup parent from repository -->
- </parent>
-
- <groupId>de.juplo.kafka</groupId>
- <artifactId>endless-consumer</artifactId>
- <version>1.0-SNAPSHOT</version>
- <name>Endless Consumer: a Simple Consumer-Group that reads and print the topic</name>
-
- <dependencies>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-actuator</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-configuration-processor</artifactId>
- <optional>true</optional>
- </dependency>
- <dependency>
- <groupId>org.apache.kafka</groupId>
- <artifactId>kafka-clients</artifactId>
- </dependency>
- <dependency>
- <groupId>org.projectlombok</groupId>
- <artifactId>lombok</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-test</artifactId>
- <scope>test</scope>
- </dependency>
- </dependencies>
-
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- </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>build</id>
- <phase>package</phase>
- <goals>
- <goal>build</goal>
- </goals>
- </execution>
- </executions>
- </plugin>
- </plugins>
- </build>
-
-</project>
+++ /dev/null
-package de.juplo.kafka;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.context.annotation.Bean;
-import org.springframework.util.Assert;
-
-import java.util.concurrent.Executors;
-
-
-@SpringBootApplication
-@EnableConfigurationProperties(ApplicationProperties.class)
-public class Application
-{
- @Autowired
- ApplicationProperties properties;
-
-
- @Bean
- public EndlessConsumer consumer()
- {
- Assert.hasText(properties.getBootstrapServer(), "consumer.bootstrap-server must be set");
- Assert.hasText(properties.getGroupId(), "consumer.group-id must be set");
- Assert.hasText(properties.getClientId(), "consumer.client-id must be set");
- Assert.hasText(properties.getTopic(), "consumer.topic must be set");
-
- EndlessConsumer consumer =
- new EndlessConsumer(
- Executors.newFixedThreadPool(1),
- properties.getBootstrapServer(),
- properties.getGroupId(),
- properties.getClientId(),
- properties.getTopic(),
- properties.getAutoOffsetReset());
-
- consumer.start();
-
- return consumer;
- }
-
- public static void main(String[] args)
- {
- SpringApplication.run(Application.class, args);
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.Getter;
-import lombok.Setter;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-
-
-@ConfigurationProperties(prefix = "consumer")
-@Getter
-@Setter
-public class ApplicationProperties
-{
- private String bootstrapServer;
- private String groupId;
- private String clientId;
- private String topic;
- private String autoOffsetReset;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import java.util.concurrent.ExecutionException;
-
-
-@RestController
-@RequiredArgsConstructor
-public class DriverController
-{
- private final EndlessConsumer consumer;
-
-
- @PostMapping("start")
- public void start()
- {
- consumer.start();
- }
-
- @PostMapping("stop")
- public void stop() throws ExecutionException, InterruptedException
- {
- consumer.stop();
- }
-}
+++ /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 javax.annotation.PreDestroy;
-import java.time.Duration;
-import java.util.Arrays;
-import java.util.Properties;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-
-@Slf4j
-public class EndlessConsumer implements Runnable
-{
- private final ExecutorService executor;
- private final String bootstrapServer;
- private final String groupId;
- private final String id;
- private final String topic;
- private final String autoOffsetReset;
-
- private AtomicBoolean running = new AtomicBoolean();
- private long consumed = 0;
- private KafkaConsumer<String, String> consumer = null;
- private Future<?> future = null;
-
- public EndlessConsumer(
- ExecutorService executor,
- String bootstrapServer,
- String groupId,
- String clientId,
- String topic,
- String autoOffsetReset)
- {
- this.executor = executor;
- this.bootstrapServer = bootstrapServer;
- this.groupId = groupId;
- this.id = clientId;
- this.topic = topic;
- this.autoOffsetReset = autoOffsetReset;
- }
-
- @Override
- public void run()
- {
- try
- {
- Properties props = new Properties();
- props.put("bootstrap.servers", bootstrapServer);
- props.put("group.id", groupId);
- props.put("client.id", id);
- props.put("auto.offset.reset", autoOffsetReset);
- props.put("key.deserializer", StringDeserializer.class.getName());
- props.put("value.deserializer", StringDeserializer.class.getName());
-
- this.consumer = new KafkaConsumer<>(props);
-
- log.info("{} - Subscribing to topic {}", id, topic);
- consumer.subscribe(Arrays.asList(topic));
-
- while (true)
- {
- ConsumerRecords<String, String> records =
- consumer.poll(Duration.ofSeconds(1));
-
- // Do something with the data...
- 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()
- );
- }
- }
- }
- catch(WakeupException e)
- {
- log.info("{} - RIIING!", id);
- }
- catch(Exception e)
- {
- log.error("{} - Unexpected error: {}", id, e.toString(), e);
- running.set(false); // Mark the instance as not running
- }
- finally
- {
- log.info("{} - Closing the KafkaConsumer", id);
- consumer.close();
- log.info("{} - Consumer-Thread exiting", id);
- }
- }
-
-
- public synchronized void start()
- {
- boolean stateChanged = running.compareAndSet(false, true);
- if (!stateChanged)
- throw new RuntimeException("Consumer instance " + id + " is already running!");
-
- log.info("{} - Starting - consumed {} messages before", id, consumed);
- future = executor.submit(this);
- }
-
- public synchronized void stop() throws ExecutionException, InterruptedException
- {
- boolean stateChanged = running.compareAndSet(true, false);
- if (!stateChanged)
- throw new RuntimeException("Consumer instance " + id + " is not running!");
-
- log.info("{} - Stopping", id);
- consumer.wakeup();
- future.get();
- log.info("{} - Stopped - consumed {} messages so far", id, consumed);
- }
-
- @PreDestroy
- public void destroy() throws ExecutionException, InterruptedException
- {
- log.info("{} - Destroy!", id);
- try
- {
- stop();
- }
- catch (IllegalStateException e)
- {
- log.info("{} - Was already stopped", id);
- }
- finally
- {
- log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
- }
- }
-}
+++ /dev/null
-consumer:
- bootstrap-server: :9092
- group-id: my-consumer
- client-id: peter
- topic: test
- auto-offset-reset: earliest
-management:
- endpoints:
- web:
- exposure:
- include: "*"
-logging:
- level:
- root: INFO
- de.juplo: DEBUG
-server:
- port: 8081
+++ /dev/null
-<?xml version="1.0" encoding="UTF-8"?>
-<configuration>
-
- <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
- <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
- <Pattern>%highlight(%-5level) %m%n</Pattern>
- </encoder>
- </appender>
-
- <logger name="de.juplo" level="TRACE"/>
- <!-- logger name="org.apache.kafka.clients" level="DEBUG" / -->
-
- <root level="INFO">
- <appender-ref ref="STDOUT" />
- </root>
-
-</configuration>
projects / demos / kafka / training / commitdiff