projects
/
demos
/
kafka
/
wordcount
/ blobdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
|
commitdiff
|
tree
raw
|
inline
| side by side
counter: 1.3.0 - (GREEN) Fixed the typing for the state-store
[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
4002df2
..
64bd619
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;
package de.juplo.kafka.wordcount.counter;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
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.streams.*;
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.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 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;
@@
-24,14
+25,12
@@
public class CounterStreamProcessor
String inputTopic,
String outputTopic,
Properties properties,
String inputTopic,
String outputTopic,
Properties properties,
- KeyValueBytesStoreSupplier storeSupplier,
- ObjectMapper mapper)
+ KeyValueBytesStoreSupplier storeSupplier)
{
Topology topology = CounterStreamProcessor.buildTopology(
inputTopic,
outputTopic,
{
Topology topology = CounterStreamProcessor.buildTopology(
inputTopic,
outputTopic,
- storeSupplier,
- mapper);
+ storeSupplier);
streams = new KafkaStreams(topology, properties);
}
streams = new KafkaStreams(topology, properties);
}
@@
-39,32
+38,32
@@
public class CounterStreamProcessor
static Topology buildTopology(
String inputTopic,
String outputTopic,
static Topology buildTopology(
String inputTopic,
String outputTopic,
- KeyValueBytesStoreSupplier storeSupplier,
- ObjectMapper mapper)
+ KeyValueBytesStoreSupplier storeSupplier)
{
StreamsBuilder builder = new StreamsBuilder();
{
StreamsBuilder builder = new StreamsBuilder();
- KStream<String, String> source = builder.stream(inputTopic);
+ KStream<User, Word> source = builder.stream(inputTopic);
+
source
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()
.groupByKey()
- .count(Materialized.as(storeSupplier))
- .mapValues(value->Long.toString(value))
+ .count(
+ Materialized
+ .<Word, Long>as(storeSupplier)
+ .withKeySerde(new JsonSerde<>().copyWithType(Word.class).forKeys()))
.toStream()
.toStream()
+ .map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
.to(outputTopic);
.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()
}
public void start()