X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fquery%2FQueryStreamProcessor.java;h=7dacd4b914e10717d539c69292300024e4b6c201;hb=0648885ec026d7434561060dc7edb703efea6853;hp=2d3d4c89211e25d47d8394ce2ba0f916c6ac4b96;hpb=9f2fda277bdd947461dc5b6dd350c29944fb43c3;p=demos%2Fkafka%2Fwordcount

diff --git a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
index 2d3d4c8..7dacd4b 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -1,21 +1,18 @@
 package de.juplo.kafka.wordcount.query;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import jakarta.annotation.PostConstruct;
 import jakarta.annotation.PreDestroy;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.common.serialization.Serdes;
-import org.apache.kafka.streams.KafkaStreams;
-import org.apache.kafka.streams.KeyQueryMetadata;
-import org.apache.kafka.streams.StoreQueryParameters;
-import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.*;
 import org.apache.kafka.streams.kstream.KStream;
 import org.apache.kafka.streams.kstream.KTable;
 import org.apache.kafka.streams.kstream.Materialized;
 import org.apache.kafka.streams.state.HostInfo;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
 import org.apache.kafka.streams.state.QueryableStoreTypes;
 import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
+import org.springframework.kafka.support.serializer.JsonSerde;
 
 import java.net.URI;
 import java.util.Optional;
@@ -25,11 +22,11 @@ import java.util.Properties;
 @Slf4j
 public class QueryStreamProcessor
 {
+	public static final String STORE_NAME = "rankings-by-username";
+
 	public final KafkaStreams streams;
 	public final HostInfo hostInfo;
-	public final String storeName = "rankingsByUsername";
-	public final StoreQueryParameters<ReadOnlyKeyValueStore<String, String>> storeParameters;
-	public final ObjectMapper mapper;
+	public final StoreQueryParameters<ReadOnlyKeyValueStore<String, UserRanking>> storeParameters;
 
 
 	public QueryStreamProcessor(
@@ -37,43 +34,53 @@ public class QueryStreamProcessor
 			HostInfo applicationServer,
 			String usersInputTopic,
 			String rankingInputTopic,
-			ObjectMapper mapper)
+			KeyValueBytesStoreSupplier storeSupplier)
+	{
+		Topology topology = buildTopology(
+				usersInputTopic,
+				rankingInputTopic,
+				storeSupplier);
+		streams = new KafkaStreams(topology, props);
+		hostInfo = applicationServer;
+		storeParameters = StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore());;
+	}
+
+	static Topology buildTopology(
+			String usersInputTopic,
+			String rankingInputTopic,
+			KeyValueBytesStoreSupplier storeSupplier)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
-		KTable<String, String> users = builder.table(usersInputTopic);
-		KStream<String, String> rankings = builder.stream(rankingInputTopic);
+		KTable<String, User> users = builder
+				.stream(usersInputTopic)
+				.toTable(Materialized.with(null, new JsonSerde().copyWithType(User.class)));
+		KStream<String, Ranking> rankings = builder.stream(rankingInputTopic);
 
 		rankings
-				.join(users, (rankingJson, userJson) ->
-				{
-					try
-					{
-						Ranking ranking = mapper.readValue(rankingJson, Ranking.class);
-						User user = mapper.readValue(userJson, User.class);
-
-						return mapper.writeValueAsString(
-								UserRanking.of(
-										user.getFirstName(),
-										user.getLastName(),
-										ranking.getEntries()));
-					}
-					catch (JsonProcessingException e)
-					{
-						throw new RuntimeException(e);
-					}
-				})
-				.toTable(Materialized.as(storeName));
-
-		streams = new KafkaStreams(builder.build(), props);
-		hostInfo = applicationServer;
-		storeParameters = StoreQueryParameters.fromNameAndType(storeName, QueryableStoreTypes.keyValueStore());;
-		this.mapper = mapper;
+				.join(users, (ranking, user) -> UserRanking.of(
+						user.getFirstName(),
+						user.getLastName(),
+						ranking.getEntries()))
+				.toTable(
+						Materialized
+								.<String, UserRanking>as(storeSupplier)
+								.withValueSerde(new JsonSerde().copyWithType(UserRanking.class)));
+
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
+
+		return topology;
+	}
+
+	ReadOnlyKeyValueStore<String, UserRanking> getStore()
+	{
+		return streams.store(storeParameters);
 	}
 
 	public Optional<URI> getRedirect(String username)
 	{
-		KeyQueryMetadata metadata = streams.queryMetadataForKey(storeName, username, Serdes.String().serializer());
+		KeyQueryMetadata metadata = streams.queryMetadataForKey(STORE_NAME, username, Serdes.String().serializer());
 		HostInfo activeHost = metadata.activeHost();
 		log.debug("Local store for {}: {}, {}:{}", username, metadata.partition(), activeHost.host(), activeHost.port());
 
@@ -89,20 +96,7 @@ public class QueryStreamProcessor
 
 	public Optional<UserRanking> getUserRanking(String username)
 	{
-		return
-				Optional
-						.ofNullable(streams.store(storeParameters).get(username))
-						.map(json ->
-						{
-							try
-							{
-								return mapper.readValue(json, UserRanking.class);
-							}
-							catch (JsonProcessingException e)
-							{
-								throw new RuntimeException(e);
-							}
-						});
+		return Optional.ofNullable(getStore().get(username));
 	}
 
 	@PostConstruct