coutner: 1.2.3 - Simplified topology, using default-serdes for all steps

- Defined `JsonSerde` as default for keys and values.
- Configured the `JsonDeserializer` for header-based typing.
- Removed the configuration of specific serdes from all steps of the
  processor-topology, expect the initial step, that needs a `StringSerde`
  for the key.

diff --git a/pom.xml b/pom.xml
index 15a07c1..cbccc73 100644 (file)
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
        </parent>
        <groupId>de.juplo.kafka.wordcount</groupId>
        <artifactId>counter</artifactId>
-       <version>1.2.2</version>
+       <version>1.2.3</version>
        <name>Wordcount-Counter</name>
        <description>Word-counting stream-processor of the multi-user wordcount-example</description>
        <properties>

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java
index f1da407..1bcc834 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java
@@ -3,7 +3,6 @@ package de.juplo.kafka.wordcount.counter;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.consumer.ConsumerConfig;
-import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.StreamsConfig;
 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
 import org.apache.kafka.streams.state.Stores;
@@ -12,6 +11,9 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
+import org.springframework.kafka.support.serializer.JsonSerde;
+import org.springframework.kafka.support.serializer.JsonSerializer;
 
 import java.util.Properties;
 import java.util.concurrent.CompletableFuture;
@@ -31,8 +33,15 @@ public class CounterApplicationConfiguriation
 
                propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
                propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
-               propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
-               propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
+               propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
+               propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
+               propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, Word.class.getPackageName());
+               propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
+               propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
+               propertyMap.put(
+                               JsonDeserializer.TYPE_MAPPINGS,
+                               "W:" + Word.class.getName() + "," +
+                               "C:" + WordCount.class.getName());
                propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
                if (properties.getCommitInterval() != null)
                        propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());

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 4cc0c68..d64eb68 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -8,10 +8,8 @@ import org.apache.kafka.streams.KeyValue;
 import org.apache.kafka.streams.StreamsBuilder;
 import org.apache.kafka.streams.Topology;
 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.*;
-import org.springframework.kafka.support.serializer.JsonSerde;
 
 import java.util.Properties;
 
@@ -48,30 +46,15 @@ public class CounterStreamProcessor
 
                KStream<String, Word> source = builder.stream(
                                inputTopic,
-                               Consumed.with(
-                                               Serdes.String(),
-                                               new JsonSerde<>(Word.class)
-                                                               .ignoreTypeHeaders()));
+                               Consumed.with(Serdes.String(), null));
 
                source
                                .map((key, word) -> new KeyValue<>(word, word))
-                               .groupByKey(Grouped.with(
-                                               new JsonSerde<>(Word.class)
-                                                               .forKeys()
-                                                               .noTypeInfo(),
-                                               new JsonSerde<>(Word.class)
-                                                               .noTypeInfo()))
+                               .groupByKey()
                                .count(Materialized.as(storeSupplier))
                                .toStream()
                                .map((word, count) -> new KeyValue<>(word, WordCount.of(word, count)))
-                               .to(
-                                               outputTopic,
-                                               Produced.with(
-                                                               new JsonSerde<>(Word.class)
-                                                                               .forKeys()
-                                                                               .noTypeInfo(),
-                                                               new JsonSerde<>(WordCount.class)
-                                                                               .noTypeInfo()));
+                               .to(outputTopic);
 
                Topology topology = builder.build();
                log.info("\n\n{}", topology.describe());