From 030c0db664cea0ec3e4307065054c449dbca6be2 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sun, 9 Jun 2024 12:41:01 +0200
Subject: [PATCH] query: 1.0.6 - Refined `QueryApplicationConfiguration` -- the
 state-store is configurable through a store-suplier

---
 .../query/QueryApplicationConfiguration.java          | 11 +++++++++++
 .../kafka/wordcount/query/QueryStreamProcessor.java   | 11 +++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/main/java/de/juplo/kafka/wordcount/query/QueryApplicationConfiguration.java b/src/main/java/de/juplo/kafka/wordcount/query/QueryApplicationConfiguration.java
index b546b8c..50a5364 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryApplicationConfiguration.java
@@ -6,6 +6,8 @@ import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.StreamsConfig;
 import org.apache.kafka.streams.state.HostInfo;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.Stores;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -19,6 +21,7 @@ import java.net.Socket;
 import java.util.Properties;
 import java.util.concurrent.CompletableFuture;
 
+import static de.juplo.kafka.wordcount.query.QueryStreamProcessor.STORE_NAME;
 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
 
 
@@ -85,6 +88,7 @@ public class QueryApplicationConfiguration
 			Properties streamProcessorProperties,
 			HostInfo applicationServer,
 			QueryApplicationProperties applicationProperties,
+			KeyValueBytesStoreSupplier storeSupplier,
 			ObjectMapper mapper,
 			ConfigurableApplicationContext context)
 	{
@@ -93,6 +97,7 @@ public class QueryApplicationConfiguration
 				applicationServer,
 				applicationProperties.getUsersInputTopic(),
 				applicationProperties.getRankingInputTopic(),
+				storeSupplier,
 				mapper);
 
 		streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
@@ -108,4 +113,10 @@ public class QueryApplicationConfiguration
 
 		return streamProcessor;
 	}
+
+	@Bean
+	public KeyValueBytesStoreSupplier storeSupplier()
+	{
+		return Stores.persistentKeyValueStore(STORE_NAME);
+	}
 }
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 efa28ca..3e205f6 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -11,6 +11,7 @@ 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;
 
@@ -35,9 +36,14 @@ public class QueryStreamProcessor
 			HostInfo applicationServer,
 			String usersInputTopic,
 			String rankingInputTopic,
+			KeyValueBytesStoreSupplier storeSupplier,
 			ObjectMapper mapper)
 	{
-		Topology topology = buildTopology(usersInputTopic, rankingInputTopic, mapper);
+		Topology topology = buildTopology(
+				usersInputTopic,
+				rankingInputTopic,
+				storeSupplier,
+				mapper);
 		streams = new KafkaStreams(topology, props);
 		hostInfo = applicationServer;
 		storeParameters = StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore());;
@@ -47,6 +53,7 @@ public class QueryStreamProcessor
 	static Topology buildTopology(
 			String usersInputTopic,
 			String rankingInputTopic,
+			KeyValueBytesStoreSupplier storeSupplier,
 			ObjectMapper mapper)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
@@ -73,7 +80,7 @@ public class QueryStreamProcessor
 						throw new RuntimeException(e);
 					}
 				})
-				.toTable(Materialized.as(STORE_NAME));
+				.toTable(Materialized.as(storeSupplier));
 
 		Topology topology = builder.build();
 		log.info("\n\n{}", topology.describe());
-- 
2.20.1