lucasbru commented on code in PR #19421:
URL: https://github.com/apache/kafka/pull/19421#discussion_r2037145316


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -180,6 +186,25 @@ public class AsyncKafkaConsumer<K, V> implements 
ConsumerDelegate<K, V> {
      */
     private class BackgroundEventProcessor implements 
EventProcessor<BackgroundEvent> {
 
+        private Optional<StreamsRebalanceListener> 
streamsGroupRebalanceCallbacks = Optional.empty();
+        private final Optional<StreamsRebalanceData> streamsRebalanceData;
+
+        public BackgroundEventProcessor() {
+            this.streamsRebalanceData = Optional.empty();
+        }
+
+        public BackgroundEventProcessor(final Optional<StreamsRebalanceData> 
streamsRebalanceData) {
+            this.streamsRebalanceData = streamsRebalanceData;
+        }
+
+        private void setStreamsRebalanceListener(final 
StreamsRebalanceListener streamsRebalanceListener) {

Review Comment:
   I think you mentioned this, but could we not just make 
`streamsRebalanceListener` a meber of `streamsRebalanceData`? If not, could we 
pass it in the constructor instead of using a setter?



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