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 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(CounterApplicationProperties.class)
  25 @Slf4j
  26 public class CounterApplicationConfiguriation
  27 {
  28         @Bean
  29         public Properties propertyMap(CounterApplicationProperties properties)
  30         {
  31                 Properties propertyMap = new Properties();
  32
  33                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  34                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  35                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  36                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  37                 propertyMap.put(JsonSerializer.ADD_TYPE_INFO_HEADERS, false);
  38                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, CounterApplication.class.getPackageName());
  39                 propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
  40                 propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
  41                 propertyMap.put(JsonDeserializer.USE_TYPE_INFO_HEADERS, false);
  42                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  43                 if (properties.getCommitInterval() != null)
  44                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  45                 if (properties.getCacheMaxBytes() != null)
  46                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
  47                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  48
  49                 return propertyMap;
  50         }
  51
  52         @Bean(initMethod = "start", destroyMethod = "stop")
  53         public CounterStreamProcessor streamProcessor(
  54                         CounterApplicationProperties properties,
  55                         Properties propertyMap,
  56                         KeyValueBytesStoreSupplier storeSupplier,
  57                         ConfigurableApplicationContext context)
  58         {
  59                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  60                                 properties.getInputTopic(),
  61                                 properties.getOutputTopic(),
  62                                 propertyMap,
  63                                 storeSupplier);
  64
  65                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  66                 {
  67                         log.error("Unexpected error!", e);
  68                         CompletableFuture.runAsync(() ->
  69                         {
  70                                 log.info("Stopping application...");
  71                                 SpringApplication.exit(context, () -> 1);
  72                         });
  73                         return SHUTDOWN_CLIENT;
  74                 });
  75
  76
  77                 return streamProcessor;
  78         }
  79
  80         @Bean
  81         public KeyValueBytesStoreSupplier storeSupplier()
  82         {
  83                 return Stores.persistentKeyValueStore("counter");
  84         }
  85 }