X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fquery%2FQueryStreamProcessor.java;h=e075eb756b2febf506543f4752585fce75c42770;hb=b52ff02b6952dfc708c7c7d94205b5b24afd68f9;hp=319861da3d3e6c0ad9cc491c4fd13d1d92d37c56;hpb=3bfe34e8bc0539932cf93361fe6f710738b37897;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 319861d..e075eb7 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -1,81 +1,102 @@
 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.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.*;
-import org.apache.kafka.streams.kstream.Materialized;
+import org.apache.kafka.streams.kstream.*;
 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 org.springframework.stereotype.Component;
+import org.springframework.kafka.support.serializer.JsonSerde;
 
-import javax.annotation.PostConstruct;
-import javax.annotation.PreDestroy;
 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
-@Component
 public class QueryStreamProcessor
 {
+	public static final String USER_STORE_NAME = "users";
+	public static final String RANKING_STORE_NAME = "rankings";
+
 	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(
-			QueryApplicationProperties properties,
-			ObjectMapper mapper,
-			ConfigurableApplicationContext context)
+			Properties props,
+			HostInfo applicationServer,
+			String usersInputTopic,
+			String rankingInputTopic,
+			KeyValueBytesStoreSupplier userStoreSupplier,
+			KeyValueBytesStoreSupplier rankingStoreSupplier)
 	{
-		StreamsBuilder builder = new StreamsBuilder();
+		Topology topology = buildTopology(
+				usersInputTopic,
+				rankingInputTopic,
+				userStoreSupplier,
+				rankingStoreSupplier);
+		streams = new KafkaStreams(topology, props);
+		hostInfo = applicationServer;
+		storeParameters = StoreQueryParameters.fromNameAndType(RANKING_STORE_NAME, QueryableStoreTypes.keyValueStore());;
+	}
 
-		builder.table(properties.getRankingInputTopic(), Materialized.as(storeName));
+	static Topology buildTopology(
+			String usersInputTopic,
+			String rankingInputTopic,
+			KeyValueBytesStoreSupplier userStoreSupplier,
+			KeyValueBytesStoreSupplier rankingStoreSupplier)
+	{
+		StreamsBuilder builder = new StreamsBuilder();
 
-		Properties props = new Properties();
-		props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
-		props.put(StreamsConfig.APPLICATION_SERVER_CONFIG, properties.getApplicationServer());
-		props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
-		props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
-		props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
-		props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+		KTable<String, User> users = builder
+				.stream(
+						usersInputTopic,
+						Consumed.with(Serdes.String(), new JsonSerde().copyWithType(User.class)))
+				.toTable(
+						Materialized
+								.<String, User>as(userStoreSupplier)
+								.withKeySerde(Serdes.String())
+								.withValueSerde(new JsonSerde().copyWithType(User.class)));
+		KStream<String, Ranking> rankings = builder
+				.<Key, Ranking>stream(rankingInputTopic)
+				.map((key, value) -> new KeyValue<>(key.getUser(), value));
+
+		rankings
+				.join(users, (ranking, user) -> UserRanking.of(
+						user.getFirstName(),
+						user.getLastName(),
+						ranking.getEntries()),
+						Joined.keySerde(Serdes.String()))
+				.toTable(
+						Materialized
+								.<String, UserRanking>as(rankingStoreSupplier)
+								.withKeySerde(Serdes.String())
+								.withValueSerde(new JsonSerde().copyWithType(UserRanking.class)));
+
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
+
+		return topology;
+	}
 
-		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;
-		});
-
-		hostInfo = HostInfo.buildFromEndpoint(properties.getApplicationServer());
-		storeParameters = StoreQueryParameters.fromNameAndType(storeName, QueryableStoreTypes.keyValueStore());;
-		this.mapper = mapper;
+	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(RANKING_STORE_NAME, username, Serdes.String().serializer());
 		HostInfo activeHost = metadata.activeHost();
 		log.debug("Local store for {}: {}, {}:{}", username, metadata.partition(), activeHost.host(), activeHost.port());
 
-		if (activeHost.equals(this.hostInfo))
+		if (activeHost.equals(this.hostInfo) || activeHost.equals(HostInfo.unavailable()))
 		{
 			return Optional.empty();
 		}
@@ -85,22 +106,9 @@ public class QueryStreamProcessor
 		return Optional.of(location);
 	}
 
-	public Optional<Ranking> getRanking(String username)
+	public Optional<UserRanking> getUserRanking(String username)
 	{
-		return
-				Optional
-						.ofNullable(streams.store(storeParameters).get(username))
-						.map(json ->
-						{
-							try
-							{
-								return mapper.readValue(json, Ranking.class);
-							}
-							catch (JsonProcessingException e)
-							{
-								throw new RuntimeException(e);
-							}
-						});
+		return Optional.ofNullable(getStore().get(username));
 	}
 
 	@PostConstruct