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

   1 package de.juplo.kafka;
   2
   3 import org.apache.kafka.clients.consumer.ConsumerRecord;
   4 import org.apache.kafka.clients.consumer.KafkaConsumer;
   5 import org.apache.kafka.common.serialization.LongDeserializer;
   6 import org.apache.kafka.common.serialization.StringDeserializer;
   7 import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
   8 import org.springframework.boot.context.properties.EnableConfigurationProperties;
   9 import org.springframework.context.annotation.Bean;
  10 import org.springframework.context.annotation.Configuration;
  11
  12 import java.util.Properties;
  13 import java.util.concurrent.ExecutorService;
  14 import java.util.concurrent.Executors;
  15 import java.util.function.Consumer;
  16
  17
  18 @Configuration
  19 @EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
  20 public class ApplicationConfiguration
  21 {
  22   @Bean
  23   public Consumer<ConsumerRecord<String, Long>> consumer()
  24   {
  25     return (record) ->
  26     {
  27       // Handle record
  28     };
  29   }
  30
  31   @Bean
  32   public EndlessConsumer<String, Long> endlessConsumer(
  33       KafkaConsumer<String, Long> kafkaConsumer,
  34       ExecutorService executor,
  35       Consumer<ConsumerRecord<String, Long>> handler,
  36       KafkaProperties kafkaProperties,
  37       ApplicationProperties applicationProperties)
  38   {
  39     return
  40         new EndlessConsumer<>(
  41             executor,
  42             kafkaProperties.getConsumer().getClientId(),
  43             applicationProperties.getTopic(),
  44             kafkaConsumer,
  45             handler);
  46   }
  47
  48   @Bean
  49   public ExecutorService executor()
  50   {
  51     return Executors.newSingleThreadExecutor();
  52   }
  53
  54   @Bean(destroyMethod = "close")
  55   public KafkaConsumer<String, Long> kafkaConsumer(KafkaProperties properties)
  56   {
  57     Properties props = new Properties();
  58
  59     props.put("bootstrap.servers", properties.getConsumer().getBootstrapServers());
  60     props.put("group.id", properties.getConsumer().getGroupId());
  61     props.put("client.id", properties.getConsumer().getClientId());
  62     props.put("auto.offset.reset", properties.getConsumer().getAutoOffsetReset());
  63     props.put("metadata.max.age.ms", "1000");
  64     props.put("key.deserializer", StringDeserializer.class.getName());
  65     props.put("value.deserializer", LongDeserializer.class.getName());
  66
  67     return new KafkaConsumer<>(props);
  68   }
  69 }