package de.juplo.kafka;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
-import org.apache.kafka.common.serialization.LongDeserializer;
-import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.core.*;
+import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
+import org.springframework.kafka.listener.DefaultErrorHandler;
+import org.springframework.kafka.support.serializer.DelegatingByTypeSerializer;
+import org.springframework.kafka.support.serializer.JsonSerializer;
+import org.springframework.util.backoff.FixedBackOff;
-import java.util.Properties;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
+import java.util.Map;
+import java.util.function.Consumer;
@Configuration
-@EnableConfigurationProperties(ApplicationProperties.class)
+@EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
public class ApplicationConfiguration
{
@Bean
- public EndlessConsumer endlessConsumer(
- KafkaConsumer<String, String> kafkaConsumer,
- ExecutorService executor,
- ApplicationProperties properties)
+ public Consumer<ConsumerRecord<String, ClientMessage>> consumer()
{
- return
- new EndlessConsumer(
- executor,
- properties.getClientId(),
- properties.getTopic(),
- kafkaConsumer);
+ return (record) ->
+ {
+ // Handle record
+ };
}
@Bean
- public ExecutorService executor()
- {
- return Executors.newSingleThreadExecutor();
+ public ProducerFactory<String, Object> producerFactory(KafkaProperties properties) {
+ return new DefaultKafkaProducerFactory<>(
+ properties.getProducer().buildProperties(),
+ new StringSerializer(),
+ new DelegatingByTypeSerializer(Map.of(
+ byte[].class, new ByteArraySerializer(),
+ ClientMessage.class, new JsonSerializer<>())));
}
- @Bean(destroyMethod = "close")
- public KafkaConsumer<String, String> kafkaConsumer(ApplicationProperties properties)
+ @Bean
+ public KafkaTemplate<String, Object> kafkaTemplate(
+ ProducerFactory<String, Object> producerFactory) {
+
+ return new KafkaTemplate<>(producerFactory);
+ }
+
+ @Bean
+ public DeadLetterPublishingRecoverer recoverer(
+ ApplicationProperties properties,
+ KafkaOperations<?, ?> template)
{
- Properties props = new Properties();
+ return new DeadLetterPublishingRecoverer(
+ template,
+ (record, exception) -> new TopicPartition(properties.getDlqTopic(), record.partition()));
+ }
- props.put("bootstrap.servers", properties.getBootstrapServer());
- props.put("group.id", properties.getGroupId());
- props.put("client.id", properties.getClientId());
- props.put("auto.offset.reset", properties.getAutoOffsetReset());
- props.put("metadata.max.age.ms", "1000");
- props.put("key.deserializer", StringDeserializer.class.getName());
- props.put("value.deserializer", LongDeserializer.class.getName());
+ @Bean
+ public DefaultErrorHandler errorHandler(DeadLetterPublishingRecoverer recoverer)
+ {
+ return new DefaultErrorHandler(recoverer, new FixedBackOff(0l, 0l));
+ }
- return new KafkaConsumer<>(props);
+ @Bean(destroyMethod = "close")
+ public org.apache.kafka.clients.consumer.Consumer<String, ClientMessage> kafkaConsumer(ConsumerFactory<String, ClientMessage> factory)
+ {
+ return factory.createConsumer();
}
}