juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java

   1 package de.juplo.kafka.wordcount.top10;
   2
   3 import lombok.extern.slf4j.Slf4j;
   4 import org.apache.kafka.clients.consumer.ConsumerConfig;
   5 import org.apache.kafka.streams.StreamsConfig;
   6 import org.springframework.boot.SpringApplication;
   7 import org.springframework.boot.context.properties.EnableConfigurationProperties;
   8 import org.springframework.context.ConfigurableApplicationContext;
   9 import org.springframework.context.annotation.Bean;
  10 import org.springframework.context.annotation.Configuration;
  11 import org.springframework.kafka.support.serializer.JsonDeserializer;
  12 import org.springframework.kafka.support.serializer.JsonSerde;
  13 import org.springframework.kafka.support.serializer.JsonSerializer;
  14
  15 import java.util.Properties;
  16 import java.util.concurrent.CompletableFuture;
  17
  18 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  19
  20
  21 @Configuration
  22 @EnableConfigurationProperties(Top10ApplicationProperties.class)
  23 @Slf4j
  24 public class Top10ApplicationConfiguration
  25 {
  26         @Bean
  27         public Properties streamProcessorProperties(Top10ApplicationProperties properties)
  28         {
  29                 Properties props = new Properties();
  30
  31                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  32                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  33                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  34                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  35                 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
  36                 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
  37                 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
  38                 props.put(
  39                                 JsonDeserializer.TYPE_MAPPINGS,
  40                                 "word:" + Key.class.getName() + "," +
  41                                 "counter:" + Entry.class.getName() + "," +
  42                                 "user:" + User.class.getName() + "," +
  43                                 "ranking:" + Ranking.class.getName());
  44                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  45                 if (properties.getCommitInterval() != null)
  46                         props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  47                 if (properties.getCacheMaxBytes() != null)
  48                         props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
  49                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  50
  51                 return props;
  52         }
  53
  54         @Bean(initMethod = "start", destroyMethod = "stop")
  55         public Top10StreamProcessor streamProcessor(
  56                         Top10ApplicationProperties applicationProperties,
  57                         Properties streamProcessorProperties,
  58                         ConfigurableApplicationContext context)
  59         {
  60                 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
  61                                 applicationProperties.getInputTopic(),
  62                                 applicationProperties.getOutputTopic(),
  63                                 streamProcessorProperties);
  64
  65                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  66                 {
  67                         log.error("Unexpected error!", e);
  68                         CompletableFuture.runAsync(() ->
  69                         {
  70                                 log.info("Stopping application...");
  71                                 SpringApplication.exit(context, () -> 1);
  72                         });
  73                         return SHUTDOWN_CLIENT;
  74                 });
  75
  76                 return streamProcessor;
  77         }
  78 }