1 package de.juplo.kafka.wordcount.top10;
3 import lombok.extern.slf4j.Slf4j;
4 import org.apache.kafka.clients.consumer.ConsumerConfig;
5 import org.apache.kafka.streams.StreamsConfig;
6 import org.springframework.boot.SpringApplication;
7 import org.springframework.boot.context.properties.EnableConfigurationProperties;
8 import org.springframework.context.ConfigurableApplicationContext;
9 import org.springframework.context.annotation.Bean;
10 import org.springframework.context.annotation.Configuration;
11 import org.springframework.kafka.support.serializer.JsonDeserializer;
12 import org.springframework.kafka.support.serializer.JsonSerde;
13 import org.springframework.kafka.support.serializer.JsonSerializer;
15 import java.util.Properties;
16 import java.util.concurrent.CompletableFuture;
18 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
22 @EnableConfigurationProperties(Top10ApplicationProperties.class)
24 public class Top10ApplicationConfiguration
27 public Properties streamProcessorProperties(Top10ApplicationProperties properties)
29 Properties props = new Properties();
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, JsonSerde.class.getName());
34 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
35 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
37 JsonDeserializer.TYPE_MAPPINGS,
38 "word:" + Key.class.getName() + "," +
39 "counter:" + Entry.class.getName());
40 props.put(JsonDeserializer.REMOVE_TYPE_INFO_HEADERS, Boolean.FALSE);
42 JsonSerializer.TYPE_MAPPINGS,
43 "ranking:" + Ranking.class.getName());
44 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
49 @Bean(initMethod = "start", destroyMethod = "stop")
50 public Top10StreamProcessor streamProcessor(
51 Top10ApplicationProperties applicationProperties,
52 Properties streamProcessorProperties,
53 ConfigurableApplicationContext context)
55 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
56 applicationProperties.getInputTopic(),
57 applicationProperties.getOutputTopic(),
58 streamProcessorProperties);
60 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
62 log.error("Unexpected error!", e);
63 CompletableFuture.runAsync(() ->
65 log.info("Stopping application...");
66 SpringApplication.exit(context, () -> 1);
68 return SHUTDOWN_CLIENT;
71 return streamProcessor;