X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fcounter%2FCounterStreamProcessor.java;h=4cc0c6866bb7d31613f179debd285f3f3d9c9566;hb=f58f069e556e9782656cf4e1d09eabbfcd6fa1c4;hp=a823e25e0500aeeaffb8dac353caefed99bef06f;hpb=9856b2a34d6e2bda771b83d2825c1db8e2a6916f;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 a823e25..4cc0c68 100644
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -1,12 +1,17 @@
 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;
+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;
 
@@ -21,31 +26,57 @@ public class CounterStreamProcessor
 			String inputTopic,
 			String outputTopic,
 			Properties properties,
+			KeyValueBytesStoreSupplier storeSupplier,
+			ObjectMapper mapper)
+	{
+		Topology topology = CounterStreamProcessor.buildTopology(
+				inputTopic,
+				outputTopic,
+				storeSupplier,
+				mapper);
+
+		streams = new KafkaStreams(topology, properties);
+	}
+
+	static Topology buildTopology(
+			String inputTopic,
+			String outputTopic,
+			KeyValueBytesStoreSupplier storeSupplier,
 			ObjectMapper mapper)
 	{
 		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()
-				.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.as(storeSupplier))
 				.toStream()
-				.to(outputTopic);
+				.map((word, count) -> new KeyValue<>(word, WordCount.of(word, 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());
 
-		streams = new KafkaStreams(builder.build(), properties);
+		return topology;
 	}
 
 	public void start()