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 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.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
  15 import java.util.Properties;
  16 import java.util.concurrent.CompletableFuture;
  17
  18 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  19
  20
  21 @Configuration
  22 @EnableConfigurationProperties(Top10ApplicationProperties.class)
  23 @Slf4j
  24 public class Top10ApplicationConfiguration
  25 {
  26         @Bean
  27         public Properties streamProcessorProperties(Top10ApplicationProperties properties)
  28         {
  29                 Properties props = new Properties();
  30
  31                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  32                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  33                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
  34                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
  35                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  36
  37                 return props;
  38         }
  39
  40         @Bean(initMethod = "start", destroyMethod = "stop")
  41         public Top10StreamProcessor streamProcessor(
  42                         Top10ApplicationProperties applicationProperties,
  43                         ObjectMapper objectMapper,
  44                         Properties streamProcessorProperties,
  45                         ConfigurableApplicationContext context)
  46         {
  47                 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
  48                                 applicationProperties.getInputTopic(),
  49                                 applicationProperties.getOutputTopic(),
  50                                 objectMapper,
  51                                 streamProcessorProperties);
  52
  53                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  54                 {
  55                         log.error("Unexpected error!", e);
  56                         CompletableFuture.runAsync(() ->
  57                         {
  58                                 log.info("Stopping application...");
  59                                 SpringApplication.exit(context, () -> 1);
  60                         });
  61                         return SHUTDOWN_CLIENT;
  62                 });
  63
  64                 return streamProcessor;
  65         }
  66 }