+++ /dev/null
-*
-!target/*.jar
+++ /dev/null
-root = true
-
-[*]
-indent_style = space
-indent_size = tab
-tab_width = 2
-charset = utf-8
-end_of_line = lf
-trim_trailing_whitespace = true
-insert_final_newline = false
-
-[*.properties]
-charset = latin1
\ No newline at end of file
+++ /dev/null
-*.iml
-.idea
-target
+++ /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 []
while ! [[ $(http 0:8001/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for producer-1..."; sleep 1; done
docker-compose up -d consumer
-# tag::http[]
echo -n Nachricht 1 an Producer 0 | http -v :8000/foo
echo -n Nachricht 1 an Producer 1 | http -v :8001/foo
-# end::http[]
echo -n Nachricht 2 an Producer 0 | http -v :8000/bar
echo -n Nachricht 2 an Producer 1 | http -v :8001/bar
docker-compose exec -T cli bash << 'EOF'
echo "Altering number of partitions from 3 to 7..."
kafka-topics --bootstrap-server kafka:9092 --describe --topic test
-# tag::repartitioning[]
kafka-topics --bootstrap-server kafka:9092 --alter --topic test --partitions 7
-# end::repartitioning[]
kafka-topics --bootstrap-server kafka:9092 --describe --topic test
EOF
docker-compose logs consumer
-# tag::kafkacat[]
kafkacat -b :9092 -t test -o 0 -p0 -f'p=%p|o=%o|k=%k|v=%s\n' -qe
kafkacat -b :9092 -t test -o 0 -p1 -f'p=%p|o=%o|k=%k|v=%s\n' -qe
-# end::kafkacat[]
+++ /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>2.7.2</version>
- <relativePath/> <!-- lookup parent from repository -->
- </parent>
-
- <groupId>de.juplo.kafka</groupId>
- <artifactId>rest-producer</artifactId>
- <name>REST Producer</name>
- <description>A Simple Producer that takes messages via POST and confirms successs</description>
- <version>1.0-SNAPSHOT</version>
-
- <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.springframework.boot</groupId>
- <artifactId>spring-boot-starter-validation</artifactId>
- </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>
- <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.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- <executions>
- <execution>
- <goals>
- <goal>build-info</goal>
- </goals>
- </execution>
- </executions>
- </plugin>
- <plugin>
- <groupId>pl.project13.maven</groupId>
- <artifactId>git-commit-id-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.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 RestProducer restProducer(
- ApplicationProperties properties,
- KafkaProducer<String, String> kafkaProducer)
- {
- return
- new RestProducer(
- properties.getClientId(),
- properties.getTopic(),
- properties.getPartition(),
- kafkaProducer);
- }
-
- @Bean(destroyMethod = "close")
- 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("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 lombok.Getter;
-import lombok.Setter;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-
-import javax.validation.constraints.NotEmpty;
-import javax.validation.constraints.NotNull;
-
-
-@ConfigurationProperties(prefix = "producer")
-@Getter
-@Setter
-public class ApplicationProperties
-{
- @NotNull
- @NotEmpty
- private String bootstrapServer;
- @NotNull
- @NotEmpty
- private String clientId;
- @NotNull
- @NotEmpty
- private String topic;
- private Integer partition;
- @NotNull
- @NotEmpty
- private String acks;
- @NotNull
- private Integer batchSize;
- @NotNull
- private Integer lingerMs;
- @NotNull
- @NotEmpty
- private String compressionType;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.Value;
-
-
-@Value
-public class ErrorResponse
-{
- private final String error;
- private final Integer status;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-
-import lombok.Value;
-
-
-@Value
-public class ProduceFailure implements ProduceResult
-{
- private final String error;
- private final String exception;
- private final Integer status;
-
-
- public ProduceFailure(Exception e)
- {
- status = 500;
- exception = e.getClass().getSimpleName();
- error = e.getMessage();
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import com.fasterxml.jackson.annotation.JsonInclude;
-
-import static com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL;
-
-
-@JsonInclude(NON_NULL)
-public interface ProduceResult
-{
-}
+++ /dev/null
-package de.juplo.kafka;
-
-
-import lombok.Value;
-
-
-@Value
-public class ProduceSuccess implements ProduceResult
-{
- Integer partition;
- Long offset;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.producer.KafkaProducer;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.springframework.http.HttpStatus;
-import org.springframework.web.bind.annotation.*;
-import org.springframework.web.context.request.async.DeferredResult;
-
-import java.math.BigInteger;
-
-
-@Slf4j
-@RequestMapping
-@ResponseBody
-@RequiredArgsConstructor
-public class RestProducer
-{
- private final String id;
- private final String topic;
- private final Integer partition;
- private final KafkaProducer<String, String> producer;
-
- private long produced = 0;
-
- @PostMapping(path = "{key}")
- public DeferredResult<ProduceResult> send(
- @PathVariable String key,
- @RequestHeader(name = "X-id", required = false) Long correlationId,
- @RequestBody String value)
- {
- DeferredResult<ProduceResult> result = new DeferredResult<>();
-
- final long time = System.currentTimeMillis();
-
- final ProducerRecord<String, String> record = new ProducerRecord<>(
- topic, // Topic
- partition, // Partition
- key, // Key
- value // Value
- );
-
- record.headers().add("source", id.getBytes());
- if (correlationId != null)
- {
- record.headers().add("id", BigInteger.valueOf(correlationId).toByteArray());
- }
-
- producer.send(record, (metadata, e) ->
- {
- long now = System.currentTimeMillis();
- if (e == null)
- {
- // HANDLE SUCCESS
- produced++;
- result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
- log.debug(
- "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
- id,
- record.key(),
- record.value(),
- metadata.partition(),
- metadata.offset(),
- metadata.timestamp(),
- now - time
- );
- }
- else
- {
- // HANDLE ERROR
- result.setErrorResult(new ProduceFailure(e));
- log.error(
- "{} - ERROR key={} timestamp={} latency={}ms: {}",
- id,
- record.key(),
- metadata == null ? -1 : metadata.timestamp(),
- now - time,
- e.toString()
- );
- }
- });
-
- long now = System.currentTimeMillis();
- log.trace(
- "{} - Queued message with key={} latency={}ms",
- id,
- record.key(),
- now - time
- );
-
- return result;
- }
-
- @ExceptionHandler
- @ResponseStatus(HttpStatus.BAD_REQUEST)
- public ErrorResponse illegalStateException(IllegalStateException e)
- {
- return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
- }
-}
+++ /dev/null
-producer:
- bootstrap-server: :9092
- client-id: DEV
- topic: test
- acks: -1
- batch-size: 16384
- linger-ms: 0
- compression-type: gzip
-management:
- endpoint:
- shutdown:
- enabled: true
- endpoints:
- web:
- exposure:
- include: "*"
- info:
- env:
- enabled: true
- java:
- enabled: true
-info:
- kafka:
- bootstrap-server: ${producer.bootstrap-server}
- client-id: ${producer.client-id}
- topic: ${producer.topic}
- acks: ${producer.acks}
- batch-size: ${producer.batch-size}
- linger-ms: ${producer.linger-ms}
- compression-type: ${producer.compression-type}
-logging:
- level:
- root: INFO
- de.juplo: TRACE
-server:
- port: 8880
+++ /dev/null
-<?xml version="1.0" encoding="UTF-8"?>
-<configuration>
-
- <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
- <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
- <Pattern>%highlight(%-5level) %m%n</Pattern>
- </encoder>
- </appender>
-
- <logger name="de.juplo" level="TRACE"/>
- <!-- logger name="org.apache.kafka.clients" level="DEBUG" / -->
-
- <root level="INFO">
- <appender-ref ref="STDOUT" />
- </root>
-
-</configuration>
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.junit.jupiter.api.*;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.context.TestConfiguration;
-import org.springframework.context.annotation.Bean;
-import org.springframework.kafka.annotation.KafkaListener;
-import org.springframework.kafka.test.context.EmbeddedKafka;
-import org.springframework.test.web.servlet.MockMvc;
-
-import java.time.Duration;
-import java.util.LinkedList;
-import java.util.List;
-
-import static de.juplo.kafka.ApplicationTests.PARTITIONS;
-import static de.juplo.kafka.ApplicationTests.TOPIC;
-import static org.awaitility.Awaitility.*;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-
-
-@SpringBootTest(
- properties = {
- "spring.kafka.consumer.bootstrap-servers=${spring.embedded.kafka.brokers}",
- "producer.bootstrap-server=${spring.embedded.kafka.brokers}",
- "producer.topic=" + TOPIC})
-@AutoConfigureMockMvc
-@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
-@Slf4j
-public class ApplicationTests
-{
- static final String TOPIC = "FOO";
- static final int PARTITIONS = 10;
-
- @Autowired
- MockMvc mockMvc;
- @Autowired
- Consumer consumer;
-
-
- @BeforeEach
- public void clear()
- {
- consumer.received.clear();
- }
-
-
- @Test
- void testSendMessage() throws Exception
- {
- mockMvc
- .perform(post("/peter").content("Hallo Welt!"))
- .andExpect(status().isOk());
- await("Message was 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