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