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(
  29                         CounterApplicationProperties counterProperties)
  30         {
  31                 Properties propertyMap = serializationConfig();
  32
  33                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
  34                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
  35                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  36                 if (counterProperties.getCommitInterval() != null)
  37                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
  38                 if (counterProperties.getCacheMaxBytes() != null)
  39                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, counterProperties.getCacheMaxBytes());
  40                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  41
  42                 return propertyMap;
  43         }
  44
  45         static Properties serializationConfig()
  46         {
  47                 Properties propertyMap = new Properties();
  48
  49                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  50                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  51                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, CounterApplication.class.getPackageName());
  52                 propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
  53                 propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
  54                 propertyMap.put(
  55                                 JsonDeserializer.TYPE_MAPPINGS,
  56                                 "word:" + Word.class.getName() + "," +
  57                                 "counter:" + WordCounter.class.getName());
  58                 propertyMap.put(JsonDeserializer.REMOVE_TYPE_INFO_HEADERS, Boolean.FALSE);
  59
  60                 return propertyMap;
  61         }
  62
  63         @Bean(initMethod = "start", destroyMethod = "stop")
  64         public CounterStreamProcessor streamProcessor(
  65                         CounterApplicationProperties applicationProperties,
  66                         Properties streamProcessorProperties,
  67                         KeyValueBytesStoreSupplier storeSupplier,
  68                         ConfigurableApplicationContext context)
  69         {
  70                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  71                                 applicationProperties.getInputTopic(),
  72                                 applicationProperties.getOutputTopic(),
  73                                 streamProcessorProperties,
  74                                 storeSupplier);
  75
  76                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  77                 {
  78                         log.error("Unexpected error!", e);
  79                         CompletableFuture.runAsync(() ->
  80                         {
  81                                 log.info("Stopping application...");
  82                                 SpringApplication.exit(context, () -> 1);
  83                         });
  84                         return SHUTDOWN_CLIENT;
  85                 });
  86
  87
  88                 return streamProcessor;
  89         }
  90
  91         @Bean
  92         public KeyValueBytesStoreSupplier storeSupplier()
  93         {
  94                 return Stores.persistentKeyValueStore("counter");
  95         }
  96 }