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.annotation.Bean;
   7 import org.springframework.context.annotation.Configuration;
   8 import org.springframework.kafka.support.serializer.JsonDeserializer;
   9
  10 import java.util.Optional;
  11 import java.util.Properties;
  12 import java.util.concurrent.ExecutorService;
  13 import java.util.concurrent.Executors;
  14
  15
  16 @Configuration
  17 @EnableConfigurationProperties(ApplicationProperties.class)
  18 public class ApplicationConfiguration
  19 {
  20   @Bean
  21   public ApplicationRecordHandler recordHandler(
  22       AdderResults adderResults,
  23       ApplicationProperties properties)
  24   {
  25     return new ApplicationRecordHandler(
  26         adderResults,
  27         Optional.ofNullable(properties.getThrottle()),
  28         properties.getClientId());
  29   }
  30
  31   @Bean
  32   public AdderResults adderResults()
  33   {
  34     return new AdderResults();
  35   }
  36
  37   @Bean
  38   public ApplicationRebalanceListener rebalanceListener(
  39       ApplicationRecordHandler recordHandler,
  40       AdderResults adderResults,
  41       StateRepository stateRepository,
  42       KafkaConsumer<String, Message> consumer,
  43       ApplicationProperties properties)
  44   {
  45     return new ApplicationRebalanceListener(
  46         recordHandler,
  47         adderResults,
  48         stateRepository,
  49         properties.getClientId());
  50   }
  51
  52   @Bean
  53   public EndlessConsumer<String, Message> endlessConsumer(
  54       KafkaConsumer<String, Message> kafkaConsumer,
  55       ExecutorService executor,
  56       ApplicationRebalanceListener rebalanceListener,
  57       ApplicationRecordHandler recordHandler,
  58       ApplicationProperties properties)
  59   {
  60     return
  61         new EndlessConsumer<>(
  62             executor,
  63             properties.getClientId(),
  64             properties.getTopic(),
  65             kafkaConsumer,
  66             rebalanceListener,
  67             recordHandler);
  68   }
  69
  70   @Bean
  71   public ExecutorService executor()
  72   {
  73     return Executors.newSingleThreadExecutor();
  74   }
  75
  76   @Bean(destroyMethod = "close")
  77   public KafkaConsumer<String, Message> kafkaConsumer(ApplicationProperties properties)
  78   {
  79     Properties props = new Properties();
  80
  81     props.put("bootstrap.servers", properties.getBootstrapServer());
  82     props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.StickyAssignor");
  83     props.put("group.id", properties.getGroupId());
  84     props.put("client.id", properties.getClientId());
  85     props.put("auto.offset.reset", properties.getAutoOffsetReset());
  86     props.put("auto.commit.interval.ms", (int)properties.getCommitInterval().toMillis());
  87     props.put("metadata.max.age.ms", "1000");
  88     props.put("key.deserializer", StringDeserializer.class.getName());
  89     props.put("value.deserializer", JsonDeserializer.class.getName());
  90     props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
  91     props.put(JsonDeserializer.TYPE_MAPPINGS,
  92       Message.Type.ADD + ":" + MessageAddNumber.class.getName() + "," +
  93       Message.Type.CALC + ":" + MessageCalculateSum.class.getName());
  94
  95     return new KafkaConsumer<>(props);
  96   }
  97 }