[jira] [Commented] (KAFKA-6018) Make KafkaFuture.Function java 8 lambda compatible

["Steven Aerts (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-6018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275494#comment-16275494 ] 

Steven Aerts commented on KAFKA-6018:
-------------------------------------

[KIP218|https://cwiki.apache.org/confluence/display/KAFKA/KIP-218%3A+Make+KafkaFuture.Function+java+8+lambda+compatible] was created to track this improvement.

> Make KafkaFuture.Function java 8 lambda compatible
> --------------------------------------------------
>
>                 Key: KAFKA-6018
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6018
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>            Reporter: Steven Aerts
>
> KafkaFuture.Function is currently an empty public abstract class.
> This means you cannot implement them as a java lambda.  And you end up with constructs as:
> {code:java}
> new KafkaFuture.Function<Set<String>, Object>() {
>     @Override
>     public Object apply(Set<String> strings) {
>         return foo;
>     }
> }
> {code}
> I propose to define them as interfaces.
> So this code can become in java 8:
> {code:java}
> strings -> foo
> {code}
> I know this change is backwards incompatible (extends becomes implements).
> But as {{KafkaFuture}} is marked as {{@InterfaceStability.Evolving}}.
> And KafkaFuture states in its javadoc:
> {quote}This will eventually become a thin shim on top of Java 8's CompletableFuture.{quote}
> I think this change might be worth considering.



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