counter: 1.3.0 - (GREEN) Fixed the typing for the state-store

[demos/kafka/wordcount] / src / main / java / de / juplo / kafka / wordcount / counter / CounterStreamProcessor.java

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
index 712ab65..64bd619 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -1,14 +1,13 @@
 package de.juplo.kafka.wordcount.counter;
 
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.*;
-import org.apache.kafka.streams.kstream.Consumed;
 import org.apache.kafka.streams.kstream.KStream;
 import org.apache.kafka.streams.kstream.Materialized;
 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
 import org.apache.kafka.streams.state.QueryableStoreTypes;
 import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
+import org.springframework.kafka.support.serializer.JsonSerde;
 
 import java.util.Properties;
 
@@ -43,14 +42,15 @@ public class CounterStreamProcessor
        {
                StreamsBuilder builder = new StreamsBuilder();
 
-               KStream<String, Word> source = builder.stream(
-                               inputTopic,
-                               Consumed.with(Serdes.String(), null));
+               KStream<User, Word> source = builder.stream(inputTopic);
 
                source
                                .map((key, word) -> new KeyValue<>(word, word))
                                .groupByKey()
-                               .count(Materialized.as(storeSupplier))
+                               .count(
+                                               Materialized
+                                                               .<Word, Long>as(storeSupplier)
+                                                               .withKeySerde(new JsonSerde<>().copyWithType(Word.class).forKeys()))
                                .toStream()
                                .map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
                                .to(outputTopic);