X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fcounter%2FCounterStreamProcessor.java;h=d64eb682d3433a163f7b7f0616270b01e1a313e2;hb=refs%2Ftags%2Fcounter-1.2.3;hp=4d3bcc436f437964152284e865fd058627e8a2ee;hpb=fe049944648d9675ffe66b586b6bf860fbac696f;p=demos%2Fkafka%2Fwordcount

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
index 4d3bcc4..d64eb68 100644
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -1,89 +1,73 @@
 package de.juplo.kafka.wordcount.counter;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.KafkaStreams;
 import org.apache.kafka.streams.KeyValue;
 import org.apache.kafka.streams.StreamsBuilder;
-import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.Topology;
 import org.apache.kafka.streams.kstream.KStream;
-import org.springframework.boot.SpringApplication;
-import org.springframework.context.ConfigurableApplicationContext;
-import org.springframework.stereotype.Component;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.kstream.*;
 
-import javax.annotation.PostConstruct;
-import javax.annotation.PreDestroy;
 import java.util.Properties;
-import java.util.concurrent.CompletableFuture;
-
-import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
 
 
 @Slf4j
-@Component
 public class CounterStreamProcessor
 {
 	public final KafkaStreams streams;
 
 
 	public CounterStreamProcessor(
-			CounterApplicationProperties properties,
-			ObjectMapper mapper,
-			ConfigurableApplicationContext context)
+			String inputTopic,
+			String outputTopic,
+			Properties properties,
+			KeyValueBytesStoreSupplier storeSupplier,
+			ObjectMapper mapper)
+	{
+		Topology topology = CounterStreamProcessor.buildTopology(
+				inputTopic,
+				outputTopic,
+				storeSupplier,
+				mapper);
+
+		streams = new KafkaStreams(topology, properties);
+	}
+
+	static Topology buildTopology(
+			String inputTopic,
+			String outputTopic,
+			KeyValueBytesStoreSupplier storeSupplier,
+			ObjectMapper mapper)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
-		KStream<String, String> source = builder.stream(properties.getInputTopic());
+		KStream<String, Word> source = builder.stream(
+				inputTopic,
+				Consumed.with(Serdes.String(), null));
+
 		source
-				.map((username, word) ->
-				{
-					try
-					{
-						String key = mapper.writeValueAsString(Key.of(username, word));
-						return new KeyValue<>(key, word);
-					}
-					catch (JsonProcessingException e)
-					{
-						throw new RuntimeException(e);
-					}
-				})
+				.map((key, word) -> new KeyValue<>(word, word))
 				.groupByKey()
-				.count()
-				.mapValues(value->Long.toString(value))
+				.count(Materialized.as(storeSupplier))
 				.toStream()
-				.to(properties.getOutputTopic());
+				.map((word, count) -> new KeyValue<>(word, WordCount.of(word, count)))
+				.to(outputTopic);
 
-		Properties props = new Properties();
-		props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
-		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");
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
 
-		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;
-		});
+		return topology;
 	}
 
-	@PostConstruct
 	public void start()
 	{
 		log.info("Starting Stream-Processor");
 		streams.start();
 	}
 
-	@PreDestroy
 	public void stop()
 	{
 		log.info("Stopping Stream-Processor");