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counter: 1.3.1 - Removed the defaults for serialization/deserialization
[demos/kafka/wordcount]
/
src
/
main
/
java
/
de
/
juplo
/
kafka
/
wordcount
/
counter
/
CounterStreamProcessor.java
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
b1343a7
..
8b9c12b
100644
(file)
--- a/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@
-1,15
+1,13
@@
package de.juplo.kafka.wordcount.counter;
import lombok.extern.slf4j.Slf4j;
package de.juplo.kafka.wordcount.counter;
import lombok.extern.slf4j.Slf4j;
-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.Topology;
+import org.apache.kafka.streams.*;
import org.apache.kafka.streams.kstream.Consumed;
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.kstream.Materialized;
import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.QueryableStoreTypes;
+import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
+import org.springframework.kafka.support.serializer.JsonSerde;
import java.util.Properties;
import java.util.Properties;
@@
-17,6
+15,9
@@
import java.util.Properties;
@Slf4j
public class CounterStreamProcessor
{
@Slf4j
public class CounterStreamProcessor
{
+ public static final String STORE_NAME = "counter";
+
+
public final KafkaStreams streams;
public final KafkaStreams streams;
@@
-41,14
+42,18
@@
public class CounterStreamProcessor
{
StreamsBuilder builder = new StreamsBuilder();
{
StreamsBuilder builder = new StreamsBuilder();
- KStream<String, Word> source = builder.stream(
- inputTopic,
- Consumed.with(Serdes.String(), null));
-
- source
+ builder
+ .stream(
+ inputTopic,
+ Consumed.with(
+ new JsonSerde<>(User.class),
+ new JsonSerde<>(Word.class)))
.map((key, word) -> new KeyValue<>(word, word))
.groupByKey()
.map((key, word) -> new KeyValue<>(word, word))
.groupByKey()
- .count(Materialized.as(storeSupplier))
+ .count(
+ Materialized
+ .<Word, Long>as(storeSupplier)
+ .withKeySerde(new JsonSerde<>().copyWithType(Word.class).forKeys()))
.toStream()
.map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
.to(outputTopic);
.toStream()
.map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
.to(outputTopic);
@@
-59,6
+64,11
@@
public class CounterStreamProcessor
return topology;
}
return topology;
}
+ ReadOnlyKeyValueStore<Word, Long> getStore()
+ {
+ return streams.store(StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore()));
+ }
+
public void start()
{
log.info("Starting Stream-Processor");
public void start()
{
log.info("Starting Stream-Processor");