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.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
   7 import org.apache.kafka.streams.state.Stores;
   8 import org.springframework.boot.SpringApplication;
   9 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  10 import org.springframework.context.ConfigurableApplicationContext;
  11 import org.springframework.context.annotation.Bean;
  12 import org.springframework.context.annotation.Configuration;
  13 import org.springframework.kafka.support.serializer.JsonDeserializer;
  14 import org.springframework.kafka.support.serializer.JsonSerde;
  15 import org.springframework.kafka.support.serializer.JsonSerializer;
  16
  17 import java.util.Properties;
  18 import java.util.concurrent.CompletableFuture;
  19
  20 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  21
  22
  23 @Configuration
  24 @EnableConfigurationProperties(Top10ApplicationProperties.class)
  25 @Slf4j
  26 public class Top10ApplicationConfiguration
  27 {
  28         @Bean
  29         public Properties streamProcessorProperties(Top10ApplicationProperties properties)
  30         {
  31                 Properties props = new Properties();
  32
  33                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  34                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  35                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  36                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  37                 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
  38                 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
  39                 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
  40                 props.put(
  41                                 JsonDeserializer.TYPE_MAPPINGS,
  42                                 "word:" + Key.class.getName() + "," +
  43                                 "counter:" + Entry.class.getName() + "," +
  44                                 "user:" + User.class.getName() + "," +
  45                                 "ranking:" + Ranking.class.getName());
  46                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  47                 if (properties.getCommitInterval() != null)
  48                         props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  49                 if (properties.getCacheMaxBytes() != null)
  50                         props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
  51                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  52
  53                 return props;
  54         }
  55
  56         @Bean(initMethod = "start", destroyMethod = "stop")
  57         public Top10StreamProcessor streamProcessor(
  58                         Top10ApplicationProperties applicationProperties,
  59                         Properties streamProcessorProperties,
  60                         KeyValueBytesStoreSupplier storeSupplier,
  61                         ConfigurableApplicationContext context)
  62         {
  63                 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
  64                                 applicationProperties.getInputTopic(),
  65                                 applicationProperties.getOutputTopic(),
  66                                 streamProcessorProperties,
  67                                 storeSupplier);
  68
  69                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  70                 {
  71                         log.error("Unexpected error!", e);
  72                         CompletableFuture.runAsync(() ->
  73                         {
  74                                 log.info("Stopping application...");
  75                                 SpringApplication.exit(context, () -> 1);
  76                         });
  77                         return SHUTDOWN_CLIENT;
  78                 });
  79
  80                 return streamProcessor;
  81         }
  82
  83         @Bean
  84         public KeyValueBytesStoreSupplier storeSupplier()
  85         {
  86                 return Stores.persistentKeyValueStore("top10");
  87         }
  88 }