X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fcounter%2FCounterStreamProcessor.java;fp=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fcounter%2FCounterStreamProcessor.java;h=324e4245645a7298ca46af8e1452826787ae0832;hb=c2d06f0efd9e09a9df1c4c536d54ad969cf456eb;hp=4002df2d9872978f7feddc2110cd6df07b402888;hpb=b02b75a4e70c41795a58ca38cd62d455af8aea16;p=demos%2Fkafka%2Fwordcount

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 4002df2..324e424 100644
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -1,8 +1,8 @@
 package de.juplo.kafka.wordcount.counter;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.KafkaStreams;
 import org.apache.kafka.streams.KeyValue;
 import org.apache.kafka.streams.StreamsBuilder;
@@ -10,6 +10,8 @@ import org.apache.kafka.streams.Topology;
 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.kstream.*;
+import org.springframework.kafka.support.serializer.JsonSerde;
 
 import java.util.Properties;
 
@@ -44,27 +46,44 @@ public class CounterStreamProcessor
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
-		KStream<String, String> source = builder.stream(inputTopic);
+		KStream<String, Word> source = builder.stream(
+				inputTopic,
+				Consumed.with(
+						Serdes.String(),
+						new JsonSerde<>(Word.class)
+								.ignoreTypeHeaders()));
+
 		source
-				.map((username, word) ->
-				{
-					try
-					{
-						String key = mapper.writeValueAsString(Key.of(username, word));
-						return new KeyValue<>(key, word);
-					}
-					catch (JsonProcessingException e)
-					{
-						throw new RuntimeException(e);
-					}
-				})
-				.groupByKey()
-				.count(Materialized.as(storeSupplier))
-				.mapValues(value->Long.toString(value))
+				.map((key, word) -> new KeyValue<>(word, word))
+				.groupByKey(Grouped.with(
+						new JsonSerde<>(Word.class)
+								.forKeys()
+								.noTypeInfo(),
+						new JsonSerde<>(Word.class)
+								.noTypeInfo()))
+				.count(Materialized
+						.<Word,Long>as(storeSupplier)
+						.withKeySerde(
+								new JsonSerde<>(Word.class)
+										.forKeys()
+										.noTypeInfo())
+						.withValueSerde(
+								Serdes.Long()))
 				.toStream()
-				.to(outputTopic);
+				.map((word, count) -> new KeyValue<>(word, WordCount.of(word.getUser(), word.getWord(), count)))
+				.to(
+						outputTopic,
+						Produced.with(
+								new JsonSerde<>(Word.class)
+										.forKeys()
+										.noTypeInfo(),
+								new JsonSerde<>(WordCount.class)
+										.noTypeInfo()));
+
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
 
-		return builder.build();
+		return topology;
 	}
 
 	public void start()