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.StringDeserializer;
   6 import org.springframework.boot.context.properties.EnableConfigurationProperties;
   7 import org.springframework.context.annotation.Bean;
   8 import org.springframework.context.annotation.Configuration;
   9 import org.springframework.kafka.support.serializer.JsonDeserializer;
  10
  11 import java.util.Properties;
  12 import java.util.concurrent.ExecutorService;
  13 import java.util.concurrent.Executors;
  14 import java.util.function.Consumer;
  15
  16
  17 @Configuration
  18 @EnableConfigurationProperties(ApplicationProperties.class)
  19 public class ApplicationConfiguration
  20 {
  21   @Bean
  22   public Consumer<ConsumerRecord<String, ValidMessage>> consumer()
  23   {
  24     return (record) ->
  25     {
  26       // Handle record
  27     };
  28   }
  29
  30   @Bean
  31   public EndlessConsumer<String, ValidMessage> endlessConsumer(
  32       KafkaConsumer<String, ValidMessage> kafkaConsumer,
  33       ExecutorService executor,
  34       Consumer<ConsumerRecord<String, ValidMessage>> handler,
  35       ApplicationProperties properties)
  36   {
  37     return
  38         new EndlessConsumer<>(
  39             executor,
  40             properties.getClientId(),
  41             properties.getTopic(),
  42             kafkaConsumer,
  43             handler);
  44   }
  45
  46   @Bean
  47   public ExecutorService executor()
  48   {
  49     return Executors.newSingleThreadExecutor();
  50   }
  51
  52   @Bean(destroyMethod = "close")
  53   public KafkaConsumer<String, ValidMessage> kafkaConsumer(ApplicationProperties properties)
  54   {
  55     Properties props = new Properties();
  56
  57     props.put("bootstrap.servers", properties.getBootstrapServer());
  58     props.put("group.id", properties.getGroupId());
  59     props.put("client.id", properties.getClientId());
  60     props.put("auto.offset.reset", properties.getAutoOffsetReset());
  61     props.put("metadata.max.age.ms", "1000");
  62     props.put("key.deserializer", StringDeserializer.class.getName());
  63     props.put("value.deserializer", JsonDeserializer.class.getName());
  64     props.put(JsonDeserializer.TYPE_MAPPINGS,
  65         "message:" + ClientMessage.class.getName() + "," +
  66         "greeting:" + Greeting.class.getName());
  67     props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
  68
  69     return new KafkaConsumer<>(props);
  70   }
  71 }