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