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());
36 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
37 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
39 JsonDeserializer.TYPE_MAPPINGS,
40 "word:" + Key.class.getName() + "," +
41 "counter:" + Entry.class.getName() + "," +
42 "user:" + User.class.getName() + "," +
43 "ranking:" + Ranking.class.getName());
44 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
45 if (properties.getCommitInterval() != null)
46 props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
47 if (properties.getCacheMaxBytes() != null)
48 props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
49 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
54 @Bean(initMethod = "start", destroyMethod = "stop")
55 public Top10StreamProcessor streamProcessor(
56 Top10ApplicationProperties applicationProperties,
57 Properties streamProcessorProperties,
58 ConfigurableApplicationContext context)
60 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
61 applicationProperties.getInputTopic(),
62 applicationProperties.getOutputTopic(),
63 streamProcessorProperties);
65 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
67 log.error("Unexpected error!", e);
68 CompletableFuture.runAsync(() ->
70 log.info("Stopping application...");
71 SpringApplication.exit(context, () -> 1);
73 return SHUTDOWN_CLIENT;
76 return streamProcessor;