X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Ftop10%2FTop10StreamProcessor.java;h=70ead8796c49617037fa39a176aa44390417a272;hb=3b7fae76b8abb62a8cae3a4a32c880b29bce0574;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..70ead87 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 +1,11 @@
 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.*;
+import org.apache.kafka.streams.kstream.Materialized;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.QueryableStoreTypes;
+import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
 
 import java.util.Properties;
 
@@ -13,55 +13,52 @@ import java.util.Properties;
 @Slf4j
 public class Top10StreamProcessor
 {
+	public static final String STORE_NAME= "top10";
+
 	public final KafkaStreams streams;
 
 
 	public Top10StreamProcessor(
 			String inputTopic,
 			String outputTopic,
-			ObjectMapper mapper,
-			Properties props)
+			Properties props,
+			KeyValueBytesStoreSupplier storeSupplier)
+	{
+		Topology topology = Top10StreamProcessor.buildTopology(
+				inputTopic,
+				outputTopic,
+				storeSupplier);
+
+		streams = new KafkaStreams(topology, props);
+	}
+
+	static Topology buildTopology(
+			String inputTopic,
+			String outputTopic,
+			KeyValueBytesStoreSupplier storeSupplier)
 	{
 		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<>(User.of(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),
+						Materialized.as(storeSupplier))
 				.toStream()
 				.to(outputTopic);
 
-		streams = new KafkaStreams(builder.build(), props);
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
+
+		return topology;
+	}
+
+	ReadOnlyKeyValueStore<User, Ranking> getStore()
+	{
+		return streams.store(StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore()));
 	}
 
 	public void start()