juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/counter/CounterApplication.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.common.serialization.Serdes;
   7 import org.apache.kafka.streams.StreamsConfig;
   8 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
   9 import org.apache.kafka.streams.state.Stores;
  10 import org.springframework.boot.SpringApplication;
  11 import org.springframework.boot.autoconfigure.SpringBootApplication;
  12 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  13 import org.springframework.context.ConfigurableApplicationContext;
  14 import org.springframework.context.annotation.Bean;
  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 @SpringBootApplication
  23 @EnableConfigurationProperties(CounterApplicationProperties.class)
  24 @Slf4j
  25 public class CounterApplication
  26 {
  27         @Bean(initMethod = "start", destroyMethod = "stop")
  28         public CounterStreamProcessor streamProcessor(
  29                         CounterApplicationProperties properties,
  30                         KeyValueBytesStoreSupplier storeSupplier,
  31                         ObjectMapper objectMapper,
  32                         ConfigurableApplicationContext context)
  33         {
  34                 Properties propertyMap = new Properties();
  35
  36                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  37                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  38                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  39                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  40                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  41                 if (properties.getCommitInterval() != null)
  42                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  43                 if (properties.getCacheMaxBytes() != null)
  44                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
  45                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  46
  47                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  48                                 properties.getInputTopic(),
  49                                 properties.getOutputTopic(),
  50                                 propertyMap,
  51                                 storeSupplier,
  52                                 objectMapper);
  53
  54                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  55                 {
  56                         log.error("Unexpected error!", e);
  57                         CompletableFuture.runAsync(() ->
  58                         {
  59                                 log.info("Stopping application...");
  60                                 SpringApplication.exit(context, () -> 1);
  61                         });
  62                         return SHUTDOWN_CLIENT;
  63                 });
  64
  65
  66                 return streamProcessor;
  67         }
  68
  69         @Bean
  70         public KeyValueBytesStoreSupplier storeSupplier()
  71         {
  72                 return Stores.persistentKeyValueStore("counter");
  73         }
  74
  75         public static void main(String[] args)
  76         {
  77                 SpringApplication.run(CounterApplication.class, args);
  78         }
  79 }