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counter: 1.2.12 - Renamed `WordCount` into `WordCounter` -- MOVE
[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
b19502d
..
3dd8c0f
100644
(file)
--- a/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@
-1,11
+1,12
@@
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.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.KafkaStreams;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.Topology;
+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.KStream;
import org.apache.kafka.streams.kstream.Materialized;
import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
@@
-23,32
+24,39
@@
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,
+ storeSupplier);
+
+ streams = new KafkaStreams(topology, properties);
+ }
+
+ static Topology buildTopology(
+ String inputTopic,
+ String outputTopic,
+ KeyValueBytesStoreSupplier storeSupplier)
{
StreamsBuilder builder = new StreamsBuilder();
{
StreamsBuilder builder = new StreamsBuilder();
- KStream<String, String> source = builder.stream(inputTopic);
+ KStream<String, Word> source = builder.stream(
+ inputTopic,
+ Consumed.with(Serdes.String(), null));
+
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()
.count(Materialized.as(storeSupplier))
.groupByKey()
.count(Materialized.as(storeSupplier))
- .mapValues(value->Long.toString(value))
.toStream()
.toStream()
+ .map((word, count) -> new KeyValue<>(word, WordCount.of(word, count)))
.to(outputTopic);
.to(outputTopic);
- streams = new KafkaStreams(builder.build(), properties);
+ Topology topology = builder.build();
+ log.info("\n\n{}", topology.describe());
+
+ return topology;
}
public void start()
}
public void start()