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 org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  20
  21
  22 @Configuration
  23 @EnableConfigurationProperties(CounterApplicationProperties.class)
  24 @Slf4j
  25 public class CounterApplicationConfiguriation
  26 {
  27         @Bean
  28         public Properties streamProcessorProperties(CounterApplicationProperties counterProperties)
  29         {
  30                 Properties propertyMap = new Properties();
  31
  32                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
  33                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
  34                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  35                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  36                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, CounterApplication.class.getPackageName());
  37                 propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
  38                 propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
  39                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  40                 if (counterProperties.getCommitInterval() != null)
  41                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
  42                 if (counterProperties.getCacheMaxBytes() != null)
  43                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, counterProperties.getCacheMaxBytes());
  44                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  45
  46                 return propertyMap;
  47         }
  48
  49         @Bean(initMethod = "start", destroyMethod = "stop")
  50         public CounterStreamProcessor streamProcessor(
  51                         CounterApplicationProperties applicationProperties,
  52                         Properties streamProcessorProperties,
  53                         KeyValueBytesStoreSupplier storeSupplier,
  54                         ConfigurableApplicationContext context)
  55         {
  56                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  57                                 applicationProperties.getInputTopic(),
  58                                 applicationProperties.getOutputTopic(),
  59                                 streamProcessorProperties,
  60                                 storeSupplier);
  61
  62                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  63                 {
  64                         log.error("Unexpected error!", e);
  65                         CompletableFuture.runAsync(() ->
  66                         {
  67                                 log.info("Stopping application...");
  68                                 SpringApplication.exit(context, () -> 1);
  69                         });
  70                         return SHUTDOWN_CLIENT;
  71                 });
  72
  73
  74                 return streamProcessor;
  75         }
  76
  77         @Bean
  78         public KeyValueBytesStoreSupplier storeSupplier()
  79         {
  80                 return Stores.persistentKeyValueStore("counter");
  81         }
  82 }