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;
16 import java.util.Properties;
17 import java.util.concurrent.CompletableFuture;
19 import static de.juplo.kafka.wordcount.top10.Top10StreamProcessor.STORE_NAME;
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.putAll(serializationConfig());
35 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
36 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
38 if (properties.getCommitInterval() != null)
39 props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
40 if (properties.getCacheMaxBytes() != null)
41 props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
43 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
48 static Properties serializationConfig()
50 Properties props = new Properties();
52 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
53 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
54 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
55 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
57 JsonDeserializer.TYPE_MAPPINGS,
58 "word:" + Key.class.getName() + "," +
59 "counter:" + Entry.class.getName() + "," +
60 "user:" + User.class.getName() + "," +
61 "ranking:" + Ranking.class.getName());
66 @Bean(initMethod = "start", destroyMethod = "stop")
67 public Top10StreamProcessor streamProcessor(
68 Top10ApplicationProperties applicationProperties,
69 Properties streamProcessorProperties,
70 KeyValueBytesStoreSupplier storeSupplier,
71 ConfigurableApplicationContext context)
73 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
74 applicationProperties.getInputTopic(),
75 applicationProperties.getOutputTopic(),
76 streamProcessorProperties,
79 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
81 log.error("Unexpected error!", e);
82 CompletableFuture.runAsync(() ->
84 log.info("Stopping application...");
85 SpringApplication.exit(context, () -> 1);
87 return SHUTDOWN_CLIENT;
90 return streamProcessor;
94 public KeyValueBytesStoreSupplier storeSupplier()
96 return Stores.persistentKeyValueStore(STORE_NAME);