1 package de.juplo.kafka.wordcount.counter;
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.counter.CounterStreamProcessor.STORE_NAME;
20 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
24 @EnableConfigurationProperties(CounterApplicationProperties.class)
26 public class CounterApplicationConfiguriation
29 public Properties streamProcessorProperties(
30 CounterApplicationProperties counterProperties)
32 Properties propertyMap = serializationConfig();
34 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
36 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
37 if (counterProperties.getCommitInterval() != null)
38 propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
39 if (counterProperties.getCacheMaxBytes() != null)
40 propertyMap.put(StreamsConfig.STATESTORE_CACHE_MAX_BYTES_CONFIG, counterProperties.getCacheMaxBytes());
42 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
47 static Properties serializationConfig()
49 Properties propertyMap = new Properties();
51 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
52 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
53 propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
54 propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
56 JsonDeserializer.TYPE_MAPPINGS,
57 "word:" + Word.class.getName() + "," +
58 "counter:" + WordCounter.class.getName());
63 @Bean(initMethod = "start", destroyMethod = "stop")
64 public CounterStreamProcessor streamProcessor(
65 CounterApplicationProperties applicationProperties,
66 Properties streamProcessorProperties,
67 KeyValueBytesStoreSupplier storeSupplier,
68 ConfigurableApplicationContext context)
70 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
71 applicationProperties.getInputTopic(),
72 applicationProperties.getOutputTopic(),
73 streamProcessorProperties,
76 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
78 log.error("Unexpected error!", e);
79 CompletableFuture.runAsync(() ->
81 log.info("Stopping application...");
82 SpringApplication.exit(context, () -> 1);
84 return SHUTDOWN_CLIENT;
88 return streamProcessor;
92 public KeyValueBytesStoreSupplier storeSupplier()
94 return Stores.persistentKeyValueStore(STORE_NAME);