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counter: 1.2.15 - Inlined the asserting ``Consumer``s
[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
..
712ab65
100644
(file)
--- a/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/
src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@
-1,14
+1,14
@@
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.KafkaStream
s;
-import org.apache.kafka.streams.
KeyValue
;
-import org.apache.kafka.streams.
StreamsBuilder
;
+import org.apache.kafka.
common.serialization.Serde
s;
+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.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;
import java.util.Properties;
@@
-16,6
+16,9
@@
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;
@@
-23,32
+26,44
@@
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, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
.to(outputTopic);
.to(outputTopic);
- streams = new KafkaStreams(builder.build(), properties);
+ 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()