juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java

   1 package de.juplo.kafka.wordcount.top10;
   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.HashMap;
  17 import java.util.Map;
  18 import java.util.Properties;
  19 import java.util.concurrent.CompletableFuture;
  20
  21 import static de.juplo.kafka.wordcount.top10.Top10StreamProcessor.STORE_NAME;
  22 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  23
  24
  25 @Configuration
  26 @EnableConfigurationProperties(Top10ApplicationProperties.class)
  27 @Slf4j
  28 public class Top10ApplicationConfiguration
  29 {
  30         @Bean
  31         public Properties streamProcessorProperties(Top10ApplicationProperties properties)
  32         {
  33                 Properties props = new Properties();
  34
  35                 props.putAll(serializationConfig());
  36
  37                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  38                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  39                 if (properties.getCommitInterval() != null)
  40                         props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  41                 if (properties.getCacheMaxBytes() != null)
  42                         props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
  43
  44                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  45
  46                 return props;
  47         }
  48
  49         static Map<String, Object> serializationConfig()
  50         {
  51                 Map<String, Object> props = new HashMap<>();
  52
  53                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  54                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
  55                 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
  56                 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
  57                 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
  58                 props.put(
  59                                 JsonDeserializer.TYPE_MAPPINGS,
  60                                 "word:" + Key.class.getName() + "," +
  61                                 "counter:" + Entry.class.getName() + "," +
  62                                 "user:" + User.class.getName() + "," +
  63                                 "ranking:" + Ranking.class.getName());
  64
  65                 return props;
  66         }
  67
  68         @Bean(initMethod = "start", destroyMethod = "stop")
  69         public Top10StreamProcessor streamProcessor(
  70                         Top10ApplicationProperties applicationProperties,
  71                         Properties streamProcessorProperties,
  72                         KeyValueBytesStoreSupplier storeSupplier,
  73                         ConfigurableApplicationContext context)
  74         {
  75                 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
  76                                 applicationProperties.getInputTopic(),
  77                                 applicationProperties.getOutputTopic(),
  78                                 streamProcessorProperties,
  79                                 storeSupplier);
  80
  81                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  82                 {
  83                         log.error("Unexpected error!", e);
  84                         CompletableFuture.runAsync(() ->
  85                         {
  86                                 log.info("Stopping application...");
  87                                 SpringApplication.exit(context, () -> 1);
  88                         });
  89                         return SHUTDOWN_CLIENT;
  90                 });
  91
  92                 return streamProcessor;
  93         }
  94
  95         @Bean
  96         public KeyValueBytesStoreSupplier storeSupplier()
  97         {
  98                 return Stores.persistentKeyValueStore(STORE_NAME);
  99         }
 100 }