A CallbackPromise creates a callback which can be eventually filled in with
a value. This works similarly to a scala Promise. CallbackPromises are not
thread-safe. For thread-safety, simply use a scala Promise and use
Callback.fromFuture on it's corresponding Future.
A CallbackPromise creates a callback which can be eventually filled in with a value. This works similarly to a scala Promise. CallbackPromises are not thread-safe. For thread-safety, simply use a scala Promise and use Callback.fromFuture on it's corresponding Future.