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.Consumer;
   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.time.Clock;
  12 import java.util.Optional;
  13 import java.util.Properties;
  14 import java.util.concurrent.ExecutorService;
  15 import java.util.concurrent.Executors;
  16
  17
  18 @Configuration
  19 @EnableConfigurationProperties(ApplicationProperties.class)
  20 public class ApplicationConfiguration
  21 {
  22   @Bean
  23   public ApplicationRecordHandler recordHandler(
  24       AdderResults adderResults,
  25       ApplicationProperties properties)
  26   {
  27     return new ApplicationRecordHandler(
  28         adderResults,
  29         Optional.ofNullable(properties.getThrottle()),
  30         properties.getClientId());
  31   }
  32
  33   @Bean
  34   public AdderResults adderResults()
  35   {
  36     return new AdderResults();
  37   }
  38
  39   @Bean
  40   public ApplicationRebalanceListener rebalanceListener(
  41       ApplicationRecordHandler recordHandler,
  42       AdderResults adderResults,
  43       StateRepository stateRepository,
  44       Consumer<String, Message> consumer,
  45       ApplicationProperties properties)
  46   {
  47     return new ApplicationRebalanceListener(
  48         recordHandler,
  49         adderResults,
  50         stateRepository,
  51         properties.getClientId(),
  52         properties.getTopic(),
  53         Clock.systemDefaultZone(),
  54         properties.getCommitInterval(),
  55         consumer);
  56   }
  57
  58   @Bean
  59   public EndlessConsumer<String, Message> endlessConsumer(
  60       KafkaConsumer<String, Message> kafkaConsumer,
  61       ExecutorService executor,
  62       ApplicationRebalanceListener rebalanceListener,
  63       ApplicationRecordHandler recordHandler,
  64       ApplicationProperties properties)
  65   {
  66     return
  67         new EndlessConsumer<>(
  68             executor,
  69             properties.getClientId(),
  70             properties.getTopic(),
  71             kafkaConsumer,
  72             rebalanceListener,
  73             recordHandler);
  74   }
  75
  76   @Bean
  77   public ExecutorService executor()
  78   {
  79     return Executors.newSingleThreadExecutor();
  80   }
  81
  82   @Bean(destroyMethod = "close")
  83   public KafkaConsumer<String, Message> kafkaConsumer(ApplicationProperties properties)
  84   {
  85     Properties props = new Properties();
  86
  87     props.put("bootstrap.servers", properties.getBootstrapServer());
  88     props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
  89     props.put("group.id", properties.getGroupId());
  90     props.put("client.id", properties.getClientId());
  91     props.put("enable.auto.commit", false);
  92     props.put("auto.offset.reset", properties.getAutoOffsetReset());
  93     props.put("metadata.max.age.ms", "1000");
  94     props.put("key.deserializer", StringDeserializer.class.getName());
  95     props.put("value.deserializer", JsonDeserializer.class.getName());
  96     props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
  97     props.put(JsonDeserializer.TYPE_MAPPINGS,
  98       Message.Type.ADD + ":" + MessageAddNumber.class.getName() + "," +
  99       Message.Type.CALC + ":" + MessageCalculateSum.class.getName());
 100
 101     return new KafkaConsumer<>(props);
 102   }
 103 }