juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/popular/PopularApplicationConfiguriation.java

   1 package de.juplo.kafka.wordcount.popular;
   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.apache.kafka.streams.state.WindowBytesStoreSupplier;
   9 import org.springframework.boot.SpringApplication;
  10 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  11 import org.springframework.context.ConfigurableApplicationContext;
  12 import org.springframework.context.annotation.Bean;
  13 import org.springframework.context.annotation.Configuration;
  14 import org.springframework.kafka.support.serializer.JsonDeserializer;
  15 import org.springframework.kafka.support.serializer.JsonSerde;
  16
  17 import java.time.ZoneId;
  18 import java.util.Properties;
  19 import java.util.concurrent.CompletableFuture;
  20
  21 import static de.juplo.kafka.wordcount.popular.PopularStreamProcessor.*;
  22 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  23
  24
  25 @Configuration
  26 @EnableConfigurationProperties(PopularApplicationProperties.class)
  27 @Slf4j
  28 public class PopularApplicationConfiguriation
  29 {
  30         @Bean
  31         public Properties streamProcessorProperties(
  32                         PopularApplicationProperties counterProperties)
  33         {
  34                 Properties propertyMap = serializationConfig();
  35
  36                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
  37
  38                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
  39                 if (counterProperties.getCommitInterval() != null)
  40                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
  41                 if (counterProperties.getCacheMaxBytes() != null)
  42                         propertyMap.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, counterProperties.getCacheMaxBytes());
  43
  44                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  45
  46                 return propertyMap;
  47         }
  48
  49         static Properties serializationConfig()
  50         {
  51                 Properties propertyMap = new Properties();
  52
  53                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  54                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  55                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, PopularApplication.class.getPackageName());
  56
  57                 return propertyMap;
  58         }
  59
  60         @Bean(initMethod = "start", destroyMethod = "stop")
  61         public PopularStreamProcessor streamProcessor(
  62                         PopularApplicationProperties applicationProperties,
  63                         Properties streamProcessorProperties,
  64                         KeyValueBytesStoreSupplier keyValueBytesStoreSupplier,
  65                         WindowBytesStoreSupplier windowBytesStoreSupplier,
  66                         ConfigurableApplicationContext context)
  67         {
  68                 PopularStreamProcessor streamProcessor = new PopularStreamProcessor(
  69                                 applicationProperties.getInputTopic(),
  70                                 applicationProperties.getOutputTopic(),
  71                                 streamProcessorProperties,
  72                                 windowBytesStoreSupplier,
  73                                 keyValueBytesStoreSupplier);
  74
  75                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  76                 {
  77                         log.error("Unexpected error!", e);
  78                         CompletableFuture.runAsync(() ->
  79                         {
  80                                 log.info("Stopping application...");
  81                                 SpringApplication.exit(context, () -> 1);
  82                         });
  83                         return SHUTDOWN_CLIENT;
  84                 });
  85
  86
  87                 return streamProcessor;
  88         }
  89
  90         @Bean
  91         public WindowBytesStoreSupplier windowBytesStoreSupplier()
  92         {
  93                 return Stores.persistentWindowStore(
  94                                 KEY_VALUE_STORE_NAME,
  95                                 WINDOW_SIZE.multipliedBy(2),
  96                                 WINDOW_SIZE,
  97                                 false); // << Must always be `false` for normal use-cases!
  98         }
  99
 100         @Bean
 101         public KeyValueBytesStoreSupplier keyValueBytesStoreSupplier()
 102         {
 103                 return Stores.persistentKeyValueStore(WINDOW_STORE_NAME);
 104         }
 105 }