juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java

   1 package de.juplo.kafka.wordcount.counter;
   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.counter.CounterStreamProcessor.STORE_NAME;
  20 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  21
  22
  23 @Configuration
  24 @EnableConfigurationProperties(CounterApplicationProperties.class)
  25 @Slf4j
  26 public class CounterApplicationConfiguriation
  27 {
  28         @Bean
  29         public Properties streamProcessorProperties(
  30                         CounterApplicationProperties counterProperties)
  31         {
  32                 Properties propertyMap = serializationConfig();
  33
  34                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
  35
  36                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
  37                 if (counterProperties.getCommitInterval() != null)
  38                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
  39                 if (counterProperties.getCacheMaxBytes() != null)
  40                         propertyMap.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, counterProperties.getCacheMaxBytes());
  41
  42                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  43
  44                 return propertyMap;
  45         }
  46
  47         static Properties serializationConfig()
  48         {
  49                 Properties propertyMap = new Properties();
  50
  51                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  52                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  53                 propertyMap.put(
  54                                 JsonDeserializer.TYPE_MAPPINGS,
  55                                 "user:" + User.class.getName() + "," +
  56                                 "word:" + Word.class.getName() + "," +
  57                                 "counter:" + WordCounter.class.getName());
  58
  59                 return propertyMap;
  60         }
  61
  62         @Bean(initMethod = "start", destroyMethod = "stop")
  63         public CounterStreamProcessor streamProcessor(
  64                         CounterApplicationProperties applicationProperties,
  65                         Properties streamProcessorProperties,
  66                         KeyValueBytesStoreSupplier storeSupplier,
  67                         ConfigurableApplicationContext context)
  68         {
  69                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  70                                 applicationProperties.getInputTopic(),
  71                                 applicationProperties.getOutputTopic(),
  72                                 streamProcessorProperties,
  73                                 storeSupplier);
  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 KeyValueBytesStoreSupplier storeSupplier()
  92         {
  93                 return Stores.persistentKeyValueStore(STORE_NAME);
  94         }
  95 }