query: 1.0.6 - Refined `QueryStreamProcessor`

[demos/kafka/wordcount] / src / main / java / de / juplo / kafka / wordcount / query / QueryStreamProcessor.java

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 f7dc750..15b28db 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -2,50 +2,48 @@ 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.KafkaStreams;
+import org.apache.kafka.streams.KeyQueryMetadata;
+import org.apache.kafka.streams.StoreQueryParameters;
+import org.apache.kafka.streams.StreamsBuilder;
 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.QueryableStoreTypes;
 import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
-import org.springframework.boot.SpringApplication;
-import org.springframework.context.ConfigurableApplicationContext;
-import org.springframework.stereotype.Component;
 
-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 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 QueryStreamProcessor(
-                       QueryApplicationProperties properties,
-                       ObjectMapper mapper,
-                       ConfigurableApplicationContext context)
+                       Properties props,
+                       HostInfo applicationServer,
+                       String usersInputTopic,
+                       String rankingInputTopic,
+                       ObjectMapper mapper)
        {
                StreamsBuilder builder = new StreamsBuilder();
 
-               KTable<String, String> users = builder.table(properties.getUsersInputTopic());
-               KStream<String, String> rankings = builder.stream(properties.getRankingInputTopic());
+               KTable<String, String> users = builder.table(usersInputTopic);
+               KStream<String, String> rankings = builder.stream(rankingInputTopic);
 
                rankings
                                .join(users, (rankingJson, userJson) ->
@@ -66,40 +64,21 @@ public class QueryStreamProcessor
                                                throw new RuntimeException(e);
                                        }
                                })
-                               .toTable(Materialized.as(storeName));
-
-               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");
+                               .toTable(Materialized.as(STORE_NAME));
 
                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());;
+               hostInfo = applicationServer;
+               storeParameters = StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore());;
                this.mapper = mapper;
        }
 
        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());
 
-               if (activeHost.equals(this.hostInfo))
+               if (activeHost.equals(this.hostInfo) || activeHost.equals(HostInfo.unavailable()))
                {
                        return Optional.empty();
                }