1 package de.juplo.kafka.wordcount.top10;
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.streams.StreamsConfig;
7 import org.springframework.boot.SpringApplication;
8 import org.springframework.boot.context.properties.EnableConfigurationProperties;
9 import org.springframework.context.ConfigurableApplicationContext;
10 import org.springframework.context.annotation.Bean;
11 import org.springframework.context.annotation.Configuration;
12 import org.springframework.kafka.support.serializer.JsonDeserializer;
13 import org.springframework.kafka.support.serializer.JsonSerde;
14 import org.springframework.kafka.support.serializer.JsonSerializer;
16 import java.util.Properties;
17 import java.util.concurrent.CompletableFuture;
19 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
23 @EnableConfigurationProperties(Top10ApplicationProperties.class)
25 public class Top10ApplicationConfiguration
28 public Properties streamProcessorProperties(Top10ApplicationProperties properties)
30 Properties props = new Properties();
32 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
33 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
34 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
35 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
36 props.put(JsonSerializer.ADD_TYPE_INFO_HEADERS, false);
37 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
38 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
39 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, WordCount.class.getName());
40 props.put(JsonDeserializer.USE_TYPE_INFO_HEADERS, false);
41 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
46 @Bean(initMethod = "start", destroyMethod = "stop")
47 public Top10StreamProcessor streamProcessor(
48 Top10ApplicationProperties applicationProperties,
49 ObjectMapper objectMapper,
50 Properties streamProcessorProperties,
51 ConfigurableApplicationContext context)
53 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
54 applicationProperties.getInputTopic(),
55 applicationProperties.getOutputTopic(),
57 streamProcessorProperties);
59 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
61 log.error("Unexpected error!", e);
62 CompletableFuture.runAsync(() ->
64 log.info("Stopping application...");
65 SpringApplication.exit(context, () -> 1);
67 return SHUTDOWN_CLIENT;
70 return streamProcessor;