Further simplified the example: Knowledge about the key is not required

[demos/kafka/deduplication] / src / main / java / de / juplo / demo / kafka / deduplication / Deduplicator.java

diff --git a/src/main/java/de/juplo/demo/kafka/deduplication/Deduplicator.java b/src/main/java/de/juplo/demo/kafka/deduplication/Deduplicator.java
index 5c0f554..38ec22a 100644 (file)
--- a/src/main/java/de/juplo/demo/kafka/deduplication/Deduplicator.java
+++ b/src/main/java/de/juplo/demo/kafka/deduplication/Deduplicator.java
@@ -4,8 +4,8 @@ package de.juplo.demo.kafka.deduplication;
 import org.apache.kafka.common.serialization.IntegerSerializer;
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.*;
-import org.apache.kafka.streams.kstream.ValueTransformerWithKey;
-import org.apache.kafka.streams.kstream.ValueTransformerWithKeySupplier;
+import org.apache.kafka.streams.kstream.ValueTransformer;
+import org.apache.kafka.streams.kstream.ValueTransformerSupplier;
 import org.apache.kafka.streams.state.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -33,7 +33,9 @@ public class Deduplicator
   public final String host;
   public final int port;
 
-  public Deduplicator(ServerProperties serverProperties)
+  public Deduplicator(
+      ServerProperties serverProperties,
+      StreamsHealthIndicator healthIndicator)
   {
     Properties properties = new Properties();
     properties.put("bootstrap.servers", "kafka:9092");
@@ -58,6 +60,7 @@ public class Deduplicator
         LOG.error("Could not close KafkaStreams!", ex);
       }
     });
+    streams.setStateListener(healthIndicator);
   }
 
   static Topology buildTopology()
@@ -76,10 +79,10 @@ public class Deduplicator
     builder
         .<String, String>stream("input")
         .flatTransformValues(
-            new ValueTransformerWithKeySupplier<String, String, Iterable<String>>()
+            new ValueTransformerSupplier<String, Iterable<String>>()
             {
               @Override
-              public ValueTransformerWithKey<String, String, Iterable<String>> get()
+              public ValueTransformer<String, Iterable<String>> get()
               {
                 return new DeduplicationTransformer();
               }