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 org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
25 @EnableConfigurationProperties(Top10ApplicationProperties.class)
27 public class Top10ApplicationConfiguration
30 public Properties streamProcessorProperties(Top10ApplicationProperties properties)
32 Properties props = new Properties();
34 props.putAll(serializationConfig());
36 props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
37 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 Map<String, Object> serializationConfig()
50 Map<String, Object> props = new HashMap<>();
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.TRUSTED_PACKAGES, Top10Application.class.getPackageName());
55 props.put(JsonDeserializer.KEY_DEFAULT_TYPE, User.class.getName());
56 props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Ranking.class.getName());
58 JsonDeserializer.TYPE_MAPPINGS,
59 "word:" + Key.class.getName() + "," +
60 "counter:" + Entry.class.getName() + "," +
61 "user:" + User.class.getName() + "," +
62 "ranking:" + Ranking.class.getName());
67 @Bean(initMethod = "start", destroyMethod = "stop")
68 public Top10StreamProcessor streamProcessor(
69 Top10ApplicationProperties applicationProperties,
70 Properties streamProcessorProperties,
71 KeyValueBytesStoreSupplier storeSupplier,
72 ConfigurableApplicationContext context)
74 Top10StreamProcessor streamProcessor = new Top10StreamProcessor(
75 applicationProperties.getInputTopic(),
76 applicationProperties.getOutputTopic(),
77 streamProcessorProperties,
80 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
82 log.error("Unexpected error!", e);
83 CompletableFuture.runAsync(() ->
85 log.info("Stopping application...");
86 SpringApplication.exit(context, () -> 1);
88 return SHUTDOWN_CLIENT;
91 return streamProcessor;
95 public KeyValueBytesStoreSupplier storeSupplier()
97 return Stores.persistentKeyValueStore("top10");