WIP

diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
index d30e5d7..aa21c4a 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
@@ -15,6 +15,8 @@ import org.apache.kafka.streams.KeyValue;
 import org.apache.kafka.streams.StreamsBuilder;
 import org.apache.kafka.streams.StreamsConfig;
 import org.apache.kafka.streams.kstream.Consumed;
+import org.apache.kafka.streams.kstream.Materialized;
+import org.apache.kafka.streams.kstream.Produced;
 import org.springframework.boot.SpringApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.stereotype.Component;
@@ -45,7 +47,7 @@ public class Top10StreamProcessor
                StreamsBuilder builder = new StreamsBuilder();
 
                builder
-                               .<Key, Long>stream(properties.getInputTopic(), Consumed.with(SpecificAvroSerializer.class, Serdes.String()) )
+                               .<Key, Long>stream(properties.getInputTopic(), Consumed.with(null, Serdes.Long()))
                                .map((key, count) -> new KeyValue<>(
                                                key.getUsername(),
                                                Entry.newBuilder().setWord(key.getWord()).setCount(count).build()))
@@ -55,14 +57,15 @@ public class Top10StreamProcessor
                                                (username, entry, ranking) -> {
                                                        ranking.getEntries().add(entry);
                                                        return ranking;
-                                               })
+                                               },
+                                               Materialized.with(Serdes.String(), null))
                                .toStream()
-                               .to(properties.getOutputTopic());
+                               .to(properties.getOutputTopic(), Produced.keySerde(Serdes.String()));
 
                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());
+               props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, SpecificAvroSerde.class);
                props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, SpecificAvroSerde.class);
                props.put(AbstractKafkaSchemaSerDeConfig.SCHEMA_REGISTRY_URL_CONFIG, properties.getSchemaRegistry());
                props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");