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.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.context.properties.EnableConfigurationProperties;
  12 import org.springframework.context.ConfigurableApplicationContext;
  13 import org.springframework.context.annotation.Bean;
  14 import org.springframework.context.annotation.Configuration;
  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 @Configuration
  23 @EnableConfigurationProperties(CounterApplicationProperties.class)
  24 @Slf4j
  25 public class CounterApplicationConfiguriation
  26 {
  27         @Bean
  28         public Properties propertyMap(CounterApplicationProperties properties)
  29         {
  30                 Properties propertyMap = new Properties();
  31
  32                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
  33                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
  34                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  35                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
  36                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
  37                 if (properties.getCommitInterval() != null)
  38                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
  39                 if (properties.getCacheMaxBytes() != null)
  40                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
  41                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  42
  43                 return propertyMap;
  44         }
  45
  46         @Bean(initMethod = "start", destroyMethod = "stop")
  47         public CounterStreamProcessor streamProcessor(
  48                         CounterApplicationProperties properties,
  49                         Properties propertyMap,
  50                         KeyValueBytesStoreSupplier storeSupplier,
  51                         ObjectMapper objectMapper,
  52                         ConfigurableApplicationContext context)
  53         {
  54                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
  55                                 properties.getInputTopic(),
  56                                 properties.getOutputTopic(),
  57                                 propertyMap,
  58                                 storeSupplier,
  59                                 objectMapper);
  60
  61                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
  62                 {
  63                         log.error("Unexpected error!", e);
  64                         CompletableFuture.runAsync(() ->
  65                         {
  66                                 log.info("Stopping application...");
  67                                 SpringApplication.exit(context, () -> 1);
  68                         });
  69                         return SHUTDOWN_CLIENT;
  70                 });
  71
  72
  73                 return streamProcessor;
  74         }
  75
  76         @Bean
  77         public KeyValueBytesStoreSupplier storeSupplier()
  78         {
  79                 return Stores.persistentKeyValueStore("counter");
  80         }
  81 }