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.springframework.boot.SpringApplication;
   9 import org.springframework.boot.autoconfigure.SpringBootApplication;
  10 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  11 import org.springframework.context.ConfigurableApplicationContext;
  12 import org.springframework.context.annotation.Bean;
  13
  14 import java.util.Properties;
  15 import java.util.concurrent.CompletableFuture;
  16
  17 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  18
  19
  20 @SpringBootApplication
  21 @EnableConfigurationProperties(CounterApplicationProperties.class)
  22 @Slf4j
  23 public class CounterApplication
  24 {
  25         @Bean(initMethod = "start", destroyMethod = "stop")
  26         public CounterStreamProcessor streamProcessor(
  27                         CounterApplicationProperties properties,
  28                         ObjectMapper objectMapper,
  29                         ConfigurableApplicationContext context)
  30         {
  31                 Properties propertyMap = new Properties();
  32
  33                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  34                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  35                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  36                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  37                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  38                 if (properties.getCommitInterval() != null)
  39                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  40                 if (properties.getCacheMaxBytes() != null)
  41                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
  42                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  43
  44                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  45                                 properties.getInputTopic(),
  46                                 properties.getOutputTopic(),
  47                                 propertyMap,
  48                                 objectMapper);
  49
  50                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  51                 {
  52                         log.error("Unexpected error!", e);
  53                         CompletableFuture.runAsync(() ->
  54                         {
  55                                 log.info("Stopping application...");
  56                                 SpringApplication.exit(context, () -> 1);
  57                         });
  58                         return SHUTDOWN_CLIENT;
  59                 });
  60
  61
  62                 return streamProcessor;
  63         }
  64
  65         public static void main(String[] args)
  66         {
  67                 SpringApplication.run(CounterApplication.class, args);
  68         }
  69 }