WindowFuture - add listener for async notification on complete, fail etc

[ivnik]

Like ListenableFuture (guava).
https://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained

[RichardBradley]

This would be of use for many non-blocking applications. We're working on an application using Akka Actors in Scala and would like to avoid blocking threads waiting for futures.

The changes that look to be required are to add a method to register listeners on the WindowFuture interface and write an implementation in the DefaultWindowFuture class. It should not require any wide ranging changes.

Are there any plans to implement this enhancement?