From: Kai Moritz <kai@juplo.de>
Date: Thu, 14 Oct 2021 16:20:18 +0000 (+0200)
Subject: WIP
X-Git-Url: https://juplo.de/gitweb/?p=demos%2Fkafka%2Fwordcount;a=commitdiff_plain;h=5edc5e44656c9ec5b8cc75ad22dec6ddf1a2a7c4

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
--- 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");