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.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
7 import org.apache.kafka.streams.state.Stores;
8 import org.springframework.boot.SpringApplication;
9 import org.springframework.boot.context.properties.EnableConfigurationProperties;
10 import org.springframework.context.ConfigurableApplicationContext;
11 import org.springframework.context.annotation.Bean;
12 import org.springframework.context.annotation.Configuration;
13 import org.springframework.kafka.support.serializer.JsonDeserializer;
14 import org.springframework.kafka.support.serializer.JsonSerde;
15 import org.springframework.kafka.support.serializer.JsonSerializer;
17 import java.util.Properties;
18 import java.util.concurrent.CompletableFuture;
20 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
24 @EnableConfigurationProperties(Top10ApplicationProperties.class)
26 public class Top10ApplicationConfiguration
29 public Properties streamProcessorProperties(Top10ApplicationProperties properties)
31 Properties props = new Properties();
33 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
34 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
35 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
36 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
37 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
38 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
39 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
41 JsonDeserializer.TYPE_MAPPINGS,
42 "word:" + Key.class.getName() + "," +
43 "counter:" + Entry.class.getName() + "," +
44 "user:" + User.class.getName() + "," +
45 "ranking:" + Ranking.class.getName());
46 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
47 if (properties.getCommitInterval() != null)
48 props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
49 if (properties.getCacheMaxBytes() != null)
50 props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
51 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
56 @Bean(initMethod = "start", destroyMethod = "stop")
57 public Top10StreamProcessor streamProcessor(
58 Top10ApplicationProperties applicationProperties,
59 Properties streamProcessorProperties,
60 KeyValueBytesStoreSupplier storeSupplier,
61 ConfigurableApplicationContext context)
63 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
64 applicationProperties.getInputTopic(),
65 applicationProperties.getOutputTopic(),
66 streamProcessorProperties,
69 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
71 log.error("Unexpected error!", e);
72 CompletableFuture.runAsync(() ->
74 log.info("Stopping application...");
75 SpringApplication.exit(context, () -> 1);
77 return SHUTDOWN_CLIENT;
80 return streamProcessor;
84 public KeyValueBytesStoreSupplier storeSupplier()
86 return Stores.persistentKeyValueStore("top10");