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 com.fasterxml.jackson.databind.ObjectMapper;
   4 import lombok.extern.slf4j.Slf4j;
   5 import org.apache.kafka.clients.consumer.ConsumerConfig;
   6 import org.apache.kafka.streams.StreamsConfig;
   7 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
   8 import org.apache.kafka.streams.state.Stores;
   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 import org.springframework.kafka.support.serializer.JsonSerializer;
  17
  18 import java.util.Properties;
  19 import java.util.concurrent.CompletableFuture;
  20
  21 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  22
  23
  24 @Configuration
  25 @EnableConfigurationProperties(CounterApplicationProperties.class)
  26 @Slf4j
  27 public class CounterApplicationConfiguriation
  28 {
  29         @Bean
  30         public Properties propertyMap(CounterApplicationProperties properties)
  31         {
  32                 Properties propertyMap = new Properties();
  33
  34                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  35                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  36                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  37                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  38                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, Word.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(
  42                                 JsonDeserializer.TYPE_MAPPINGS,
  43                                 "W:" + Word.class.getName() + "," +
  44                                 "C:" + WordCount.class.getName());
  45                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  46                 if (properties.getCommitInterval() != null)
  47                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  48                 if (properties.getCacheMaxBytes() != null)
  49                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
  50                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  51
  52                 return propertyMap;
  53         }
  54
  55         @Bean(initMethod = "start", destroyMethod = "stop")
  56         public CounterStreamProcessor streamProcessor(
  57                         CounterApplicationProperties properties,
  58                         Properties propertyMap,
  59                         KeyValueBytesStoreSupplier storeSupplier,
  60                         ObjectMapper objectMapper,
  61                         ConfigurableApplicationContext context)
  62         {
  63                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  64                                 properties.getInputTopic(),
  65                                 properties.getOutputTopic(),
  66                                 propertyMap,
  67                                 storeSupplier,
  68                                 objectMapper);
  69
  70                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  71                 {
  72                         log.error("Unexpected error!", e);
  73                         CompletableFuture.runAsync(() ->
  74                         {
  75                                 log.info("Stopping application...");
  76                                 SpringApplication.exit(context, () -> 1);
  77                         });
  78                         return SHUTDOWN_CLIENT;
  79                 });
  80
  81
  82                 return streamProcessor;
  83         }
  84
  85         @Bean
  86         public KeyValueBytesStoreSupplier storeSupplier()
  87         {
  88                 return Stores.persistentKeyValueStore("counter");
  89         }
  90 }