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

["Ewen Cheslack-Postava (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ewen Cheslack-Postava resolved KAFKA-6018.
------------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.1.0

Issue resolved by pull request 4033
[https://github.com/apache/kafka/pull/4033]

> 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
>            Priority: Major
>             Fix For: 1.1.0
>
>
> 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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