import org.apache.kafka.streams.kstream.KStream;
import org.springframework.boot.SpringApplication;
import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
+import org.springframework.kafka.support.serializer.JsonSerde;
+import org.springframework.kafka.support.serializer.JsonSerializer;
import org.springframework.stereotype.Component;
import jakarta.annotation.PostConstruct;
{
StreamsBuilder builder = new StreamsBuilder();
- KStream<String, String> source = builder.stream(properties.getInputTopic());
+ KStream<String, Recording> source = builder.stream(properties.getInputTopic());
+
source
- .flatMapValues(sentence -> Arrays.asList(PATTERN.split(sentence)))
+ .flatMapValues(recording -> Arrays
+ .stream(PATTERN.split(recording.getSentence()))
+ .map(word -> Word.of(recording.getUser(), word))
+ .toList())
.to(properties.getOutputTopic());
Properties props = new Properties();
props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
- props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
- props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+ props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
+ props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
+ props.put(JsonDeserializer.TRUSTED_PACKAGES, Recording.class.getName() );
+ props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Recording.class.getName());
+ props.put(JsonSerializer.ADD_TYPE_INFO_HEADERS, false);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
streams = new KafkaStreams(builder.build(), props);