juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/Application.java

   1 package de.juplo.kafka;
   2
   3 import org.apache.kafka.clients.producer.ProducerConfig;
   4 import org.apache.kafka.common.serialization.ByteArraySerializer;
   5 import org.apache.kafka.common.serialization.StringSerializer;
   6 import org.springframework.boot.SpringApplication;
   7 import org.springframework.boot.autoconfigure.SpringBootApplication;
   8 import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
   9 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  10 import org.springframework.context.annotation.Bean;
  11 import org.springframework.kafka.core.DefaultKafkaProducerFactory;
  12 import org.springframework.kafka.core.KafkaOperations;
  13 import org.springframework.kafka.core.KafkaTemplate;
  14 import org.springframework.kafka.core.ProducerFactory;
  15 import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
  16 import org.springframework.kafka.listener.DefaultErrorHandler;
  17 import org.springframework.kafka.support.serializer.DelegatingByTypeSerializer;
  18 import org.springframework.kafka.support.serializer.JsonSerializer;
  19 import org.springframework.util.backoff.FixedBackOff;
  20
  21 import java.util.Map;
  22
  23
  24 @SpringBootApplication
  25 @EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
  26 public class Application
  27 {
  28   @Bean
  29   public ProducerFactory<String, Object> producerFactory(
  30     KafkaProperties properties)
  31   {
  32     Map<String, Object> map = Map.of(
  33       ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServers());
  34     return new DefaultKafkaProducerFactory<>(
  35       map,
  36       new StringSerializer(),
  37       new DelegatingByTypeSerializer(
  38         Map.of(
  39           byte[].class, new ByteArraySerializer(),
  40           MessageAddNumber.class, new JsonSerializer<>(),
  41           MessageCalculateSum.class, new JsonSerializer<>())));
  42   }
  43
  44   @Bean
  45   public KafkaTemplate<String, Object> kafkaTemplate(
  46     ProducerFactory<String, Object> producerFactory)
  47   {
  48     return new KafkaTemplate<>(producerFactory);
  49   }
  50
  51   @Bean
  52   public DeadLetterPublishingRecoverer deadLetterPublishingRecoverer(
  53     KafkaOperations<?, ?> kafkaTemplate)
  54   {
  55     return new DeadLetterPublishingRecoverer(kafkaTemplate);
  56   }
  57
  58   @Bean
  59   public DefaultErrorHandler errorHandler(
  60     DeadLetterPublishingRecoverer recoverer)
  61   {
  62     return new DefaultErrorHandler(
  63       recoverer,
  64       new FixedBackOff(0l, 0l));
  65   }
  66
  67
  68   public static void main(String[] args)
  69   {
  70     SpringApplication.run(Application.class, args);
  71   }
  72 }