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

[Steven Aerts (JIRA)]

Steven Aerts created KAFKA-6018:
-----------------------------------

             Summary: Make from 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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