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.HashMap;
18 import java.util.Properties;
19 import java.util.concurrent.CompletableFuture;
21 import static de.juplo.kafka.wordcount.top10.Top10StreamProcessor.STORE_NAME;
22 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
26 @EnableConfigurationProperties(Top10ApplicationProperties.class)
28 public class Top10ApplicationConfiguration
31 public Properties streamProcessorProperties(Top10ApplicationProperties properties)
33 Properties props = new Properties();
35 props.putAll(serializationConfig());
37 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
38 props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
39 if (properties.getCommitInterval() != null)
40 props.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
41 if (properties.getCacheMaxBytes() != null)
42 props.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, properties.getCacheMaxBytes());
44 props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
49 static Map<String, Object> serializationConfig()
51 Map<String, Object> props = new HashMap<>();
53 props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
54 props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
55 props.put(JsonDeserializer.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
56 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
57 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
59 JsonDeserializer.TYPE_MAPPINGS,
60 "word:" + Key.class.getName() + "," +
61 "counter:" + Entry.class.getName() + "," +
62 "user:" + User.class.getName() + "," +
63 "ranking:" + Ranking.class.getName());
68 @Bean(initMethod = "start", destroyMethod = "stop")
69 public Top10StreamProcessor streamProcessor(
70 Top10ApplicationProperties applicationProperties,
71 Properties streamProcessorProperties,
72 KeyValueBytesStoreSupplier storeSupplier,
73 ConfigurableApplicationContext context)
75 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
76 applicationProperties.getInputTopic(),
77 applicationProperties.getOutputTopic(),
78 streamProcessorProperties,
81 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
83 log.error("Unexpected error!", e);
84 CompletableFuture.runAsync(() ->
86 log.info("Stopping application...");
87 SpringApplication.exit(context, () -> 1);
89 return SHUTDOWN_CLIENT;
92 return streamProcessor;
96 public KeyValueBytesStoreSupplier storeSupplier()
98 return Stores.persistentKeyValueStore(STORE_NAME);