X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fquery%2FQueryStreamProcessor.java;h=c4ae4ae0a0ecdd3cee579096b16b4006060968c3;hb=2b22a006cc57203406c8589687a6c729ebdbf40c;hp=886c8cf22773f9291fe89d904df430139b924ed2;hpb=fd0085bfd05d92d9619f480b9bc25a4b7f3065f9;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 886c8cf..c4ae4ae 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -6,33 +6,27 @@ 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.boot.SpringApplication;
-import org.springframework.context.ConfigurableApplicationContext;
 
 import java.net.URI;
 import java.util.Optional;
 import java.util.Properties;
-import java.util.concurrent.CompletableFuture;
-
-import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
 
 
 @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;
 
@@ -42,8 +36,25 @@ public class QueryStreamProcessor
 			HostInfo applicationServer,
 			String usersInputTopic,
 			String rankingInputTopic,
-			ObjectMapper mapper,
-			ConfigurableApplicationContext context)
+			KeyValueBytesStoreSupplier storeSupplier,
+			ObjectMapper mapper)
+	{
+		Topology topology = buildTopology(
+				usersInputTopic,
+				rankingInputTopic,
+				storeSupplier,
+				mapper);
+		streams = new KafkaStreams(topology, props);
+		hostInfo = applicationServer;
+		storeParameters = StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore());;
+		this.mapper = mapper;
+	}
+
+	static Topology buildTopology(
+			String usersInputTopic,
+			String rankingInputTopic,
+			KeyValueBytesStoreSupplier storeSupplier,
+			ObjectMapper mapper)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
@@ -69,28 +80,22 @@ public class QueryStreamProcessor
 						throw new RuntimeException(e);
 					}
 				})
-				.toTable(Materialized.as(storeName));
+				.toTable(Materialized.as(storeSupplier));
 
-		streams = new KafkaStreams(builder.build(), props);
-		streams.setUncaughtExceptionHandler((Throwable e) ->
-		{
-			log.error("Unexpected error!", e);
-			CompletableFuture.runAsync(() ->
-			{
-				log.info("Stopping application...");
-				SpringApplication.exit(context, () -> 1);
-			});
-			return SHUTDOWN_CLIENT;
-		});
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
 
-		hostInfo = applicationServer;
-		storeParameters = StoreQueryParameters.fromNameAndType(storeName, QueryableStoreTypes.keyValueStore());;
-		this.mapper = mapper;
+		return topology;
+	}
+
+	ReadOnlyKeyValueStore<String, String> 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());
 
@@ -108,7 +113,7 @@ public class QueryStreamProcessor
 	{
 		return
 				Optional
-						.ofNullable(streams.store(storeParameters).get(username))
+						.ofNullable(getStore().get(username))
 						.map(json ->
 						{
 							try