X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fcounter%2FCounterStreamProcessor.java;h=712ab6573be5b7d555a1d96efc895b14bd0e457e;hb=3eb1ec997478982fffb31f09c21e756b529e474a;hp=4002df2d9872978f7feddc2110cd6df07b402888;hpb=b02b75a4e70c41795a58ca38cd62d455af8aea16;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 4002df2..712ab65 100644
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -1,15 +1,14 @@
 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.streams.KafkaStreams;
-import org.apache.kafka.streams.KeyValue;
-import org.apache.kafka.streams.StreamsBuilder;
-import org.apache.kafka.streams.Topology;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.streams.*;
+import org.apache.kafka.streams.kstream.Consumed;
 import org.apache.kafka.streams.kstream.KStream;
 import org.apache.kafka.streams.kstream.Materialized;
 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.QueryableStoreTypes;
+import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
 
 import java.util.Properties;
 
@@ -17,6 +16,9 @@ import java.util.Properties;
 @Slf4j
 public class CounterStreamProcessor
 {
+	public static final String STORE_NAME = "counter";
+
+
 	public final KafkaStreams streams;
 
 
@@ -24,14 +26,12 @@ public class CounterStreamProcessor
 			String inputTopic,
 			String outputTopic,
 			Properties properties,
-			KeyValueBytesStoreSupplier storeSupplier,
-			ObjectMapper mapper)
+			KeyValueBytesStoreSupplier storeSupplier)
 	{
 		Topology topology = CounterStreamProcessor.buildTopology(
 				inputTopic,
 				outputTopic,
-				storeSupplier,
-				mapper);
+				storeSupplier);
 
 		streams = new KafkaStreams(topology, properties);
 	}
@@ -39,32 +39,31 @@ public class CounterStreamProcessor
 	static Topology buildTopology(
 			String inputTopic,
 			String outputTopic,
-			KeyValueBytesStoreSupplier storeSupplier,
-			ObjectMapper mapper)
+			KeyValueBytesStoreSupplier storeSupplier)
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
-		KStream<String, String> source = builder.stream(inputTopic);
+		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(Materialized.as(storeSupplier))
-				.mapValues(value->Long.toString(value))
 				.toStream()
+				.map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
 				.to(outputTopic);
 
-		return builder.build();
+		Topology topology = builder.build();
+		log.info("\n\n{}", topology.describe());
+
+		return topology;
+	}
+
+	ReadOnlyKeyValueStore<Word, Long> getStore()
+	{
+		return streams.store(StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore()));
 	}
 
 	public void start()