X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Ftop10%2FTop10StreamProcessor.java;h=2b2cf93ff8231e307dcb786176fd10e4349db67c;hb=87f82fe35276666d298bc5100f0810b6aa6ce2d4;hp=63357e806bbb580324abf3ba4e8d2d72ab471225;hpb=dd88fb5302e60c12e77afe5242559de40dc08207;p=demos%2Fkafka%2Fwordcount

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 63357e8..2b2cf93 100644
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
@@ -1,10 +1,10 @@
 package de.juplo.kafka.wordcount.top10;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
 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 java.util.Properties;
 
@@ -18,31 +18,35 @@ public class Top10StreamProcessor
 	public Top10StreamProcessor(
 			String inputTopic,
 			String outputTopic,
-			ObjectMapper mapper,
 			Properties props)
+	{
+		Topology topology = Top10StreamProcessor.buildTopology(
+				inputTopic,
+				outputTopic);
+
+		streams = new KafkaStreams(topology, props);
+	}
+
+	static Topology buildTopology(
+			String inputTopic,
+			String outputTopic)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
 		builder
-				.<Word, WordCount>stream(inputTopic)
-				.map((word, wordCount) ->
-				{
-					Entry entry = Entry.of(word.getWord(), wordCount.getCount());
-					return new KeyValue<>(word.getUser(), entry);
-				})
+				.<Key, Entry>stream(inputTopic)
+				.map((key, entry) -> new KeyValue<>(key.getUser(), entry))
 				.groupByKey()
 				.aggregate(
 						() -> new Ranking(),
-						(user, entry, ranking) ->
-						{
-							ranking.add(entry);
-							return ranking;
-						}
-				)
+						(user, entry, ranking) ->ranking.add(entry))
 				.toStream()
 				.to(outputTopic);
 
-		streams = new KafkaStreams(builder.build(), props);
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
+
+		return topology;
 	}
 
 	public void start()