Tombert commented on code in PR #19366:
URL: https://github.com/apache/kafka/pull/19366#discussion_r2027542000
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clients/src/main/java/org/apache/kafka/clients/consumer/AcknowledgementCommitCallback.java:
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@@ -34,6 +34,7 @@
* The callback may be executed in any thread calling {@link
ShareConsumer#poll(java.time.Duration)}.
*/
@InterfaceStability.Evolving
+@FunctionalInterface
Review Comment:
Forgive me a bit here, I'm still kind of learning the Kafka codebase, but I
just think that the word "callback" itself implies some form of "response
handler" function. I will stay within Kafka's nomenclature, I just thought
that that was more or less the terminology.
`ConsumerRebalanceListener` can't be made into a `@FunctionalInterface` in
its current state because it has more than one method.
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