X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Ftop10%2FTop10StreamProcessor.java;h=a3900bf9f738b7029f6f696f3c1f7e827ffd2922;hb=7e0f4ca6927d9b62909b0789b4b14a46f8dbd0f5;hp=f0a7d191978d2b9eef1169632ca59ce858664261;hpb=e3fc3fc028270a7faef487af51128771459aed20;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 f0a7d19..a3900bf 100644
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
@@ -1,11 +1,10 @@
 package de.juplo.kafka.wordcount.top10;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-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;
 
@@ -19,49 +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
-				.<String, String>stream(inputTopic)
-				.map((keyJson, countStr) ->
-				{
-					try
-					{
-						Key key = mapper.readValue(keyJson, Key.class);
-						Long count = Long.parseLong(countStr);
-						Entry entry = Entry.of(key.getWord(), count);
-						String entryJson = mapper.writeValueAsString(entry);
-						return new KeyValue<>(key.getUsername(), entryJson);
-					}
-					catch (JsonProcessingException e)
-					{
-						throw new RuntimeException(e);
-					}
-				})
+				.<Key, Entry>stream(inputTopic)
+				.map((key, entry) -> new KeyValue<>(key.getUser(), entry))
 				.groupByKey()
 				.aggregate(
-						() -> "{\"entries\"	: []}",
-						(username, entryJson, rankingJson) ->
-						{
-							try
-							{
-								Ranking ranking = mapper.readValue(rankingJson, Ranking.class);
-								ranking.add(mapper.readValue(entryJson, Entry.class));
-								return mapper.writeValueAsString(ranking);
-							}
-							catch (JsonProcessingException e)
-							{
-								throw new RuntimeException(e);
-							}
-						}
-				)
+						() -> new 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()