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
  16 import java.util.Properties;
  17 import java.util.concurrent.CompletableFuture;
  18
  19 import static de.juplo.kafka.wordcount.top10.Top10StreamProcessor.STORE_NAME;
  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.putAll(serializationConfig());
  34
  35                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  36                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  37                 if (properties.getCommitInterval() != null)
  38                         props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  39                 if (properties.getCacheMaxBytes() != null)
  40                         props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
  41
  42                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  43
  44                 return props;
  45         }
  46
  47         static Properties serializationConfig()
  48         {
  49                 Properties props = new Properties();
  50
  51                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  52                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  53                 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
  54                 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
  55                 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
  56                 props.put(
  57                                 JsonDeserializer.TYPE_MAPPINGS,
  58                                 "word:" + Key.class.getName() + "," +
  59                                 "counter:" + Entry.class.getName() + "," +
  60                                 "user:" + User.class.getName() + "," +
  61                                 "ranking:" + Ranking.class.getName());
  62
  63                 return props;
  64         }
  65
  66         @Bean(initMethod = "start", destroyMethod = "stop")
  67         public Top10StreamProcessor streamProcessor(
  68                         Top10ApplicationProperties applicationProperties,
  69                         Properties streamProcessorProperties,
  70                         KeyValueBytesStoreSupplier storeSupplier,
  71                         ConfigurableApplicationContext context)
  72         {
  73                 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
  74                                 applicationProperties.getInputTopic(),
  75                                 applicationProperties.getOutputTopic(),
  76                                 streamProcessorProperties,
  77                                 storeSupplier);
  78
  79                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  80                 {
  81                         log.error("Unexpected error!", e);
  82                         CompletableFuture.runAsync(() ->
  83                         {
  84                                 log.info("Stopping application...");
  85                                 SpringApplication.exit(context, () -> 1);
  86                         });
  87                         return SHUTDOWN_CLIENT;
  88                 });
  89
  90                 return streamProcessor;
  91         }
  92
  93         @Bean
  94         public KeyValueBytesStoreSupplier storeSupplier()
  95         {
  96                 return Stores.persistentKeyValueStore(STORE_NAME);
  97         }
  98 }