juplo.de Git - demos/kafka/wordcount/blob - src/main/java/de/juplo/kafka/wordcount/query/QueryApplicationConfiguration.java

   1 package de.juplo.kafka.wordcount.query;
   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.HostInfo;
   9 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
  10 import org.apache.kafka.streams.state.Stores;
  11 import org.springframework.boot.SpringApplication;
  12 import org.springframework.boot.autoconfigure.web.ServerProperties;
  13 import org.springframework.boot.context.properties.EnableConfigurationProperties;
  14 import org.springframework.context.ConfigurableApplicationContext;
  15 import org.springframework.context.annotation.Bean;
  16 import org.springframework.context.annotation.Configuration;
  17
  18 import java.io.IOException;
  19 import java.net.InetSocketAddress;
  20 import java.net.Socket;
  21 import java.util.Properties;
  22 import java.util.concurrent.CompletableFuture;
  23
  24 import static de.juplo.kafka.wordcount.query.QueryStreamProcessor.STORE_NAME;
  25 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
  26
  27
  28 @Configuration
  29 @EnableConfigurationProperties(QueryApplicationProperties.class)
  30 @Slf4j
  31 public class QueryApplicationConfiguration
  32 {
  33         @Bean
  34         public HostInfo applicationServer(
  35                         ServerProperties serverProperties,
  36                         QueryApplicationProperties applicationProperties) throws IOException
  37         {
  38                 String host;
  39                 if (serverProperties.getAddress() == null)
  40                 {
  41                         HostInfo bootstrapServer = HostInfo.buildFromEndpoint(applicationProperties.getBootstrapServer());
  42                         Socket socket = new Socket();
  43                         socket.connect(new InetSocketAddress(bootstrapServer.host(), bootstrapServer.port()));
  44                         host = socket.getLocalAddress().getHostAddress();
  45                 }
  46                 else
  47                 {
  48                         host = serverProperties.getAddress().getHostAddress();
  49                 }
  50
  51                 Integer port = serverProperties.getPort() == null ? 8080 : serverProperties.getPort();
  52
  53                 return new HostInfo(host, port);
  54         }
  55
  56         @Bean
  57         public Properties streamProcessorProperties(
  58                         QueryApplicationProperties applicationProperties,
  59                         HostInfo applicationServer)
  60         {
  61                 Properties props = new Properties();
  62
  63                 props.putAll(serializationConfig());
  64
  65                 String applicationId = applicationProperties.getApplicationId();
  66                 String bootstrapServer = applicationProperties.getBootstrapServer();
  67
  68                 props.put(StreamsConfig.APPLICATION_ID_CONFIG, applicationId);
  69                 props.put(StreamsConfig.APPLICATION_SERVER_CONFIG, applicationServer.host() + ":" + applicationServer.port());
  70                 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServer);
  71                 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
  72
  73                 return props;
  74         }
  75
  76         static Properties serializationConfig()
  77         {
  78                 Properties props = new Properties();
  79
  80                 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
  81                 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
  82
  83                 return props;
  84         }
  85
  86         @Bean(initMethod = "start", destroyMethod = "stop")
  87         public QueryStreamProcessor streamProcessor(
  88                         Properties streamProcessorProperties,
  89                         HostInfo applicationServer,
  90                         QueryApplicationProperties applicationProperties,
  91                         KeyValueBytesStoreSupplier storeSupplier,
  92                         ObjectMapper mapper,
  93                         ConfigurableApplicationContext context)
  94         {
  95                 QueryStreamProcessor streamProcessor = new QueryStreamProcessor(
  96                                 streamProcessorProperties,
  97                                 applicationServer,
  98                                 applicationProperties.getUsersInputTopic(),
  99                                 applicationProperties.getRankingInputTopic(),
 100                                 storeSupplier,
 101                                 mapper);
 102
 103                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
 104                 {
 105                         log.error("Unexpected error!", e);
 106                         CompletableFuture.runAsync(() ->
 107                         {
 108                                 log.info("Stopping application...");
 109                                 SpringApplication.exit(context, () -> 1);
 110                         });
 111                         return SHUTDOWN_CLIENT;
 112                 });
 113
 114                 return streamProcessor;
 115         }
 116
 117         @Bean
 118         public KeyValueBytesStoreSupplier storeSupplier()
 119         {
 120                 return Stores.persistentKeyValueStore(STORE_NAME);
 121         }
 122 }