The talk by Tomasz Nurkiewicz about CompletableFuture was rated the highest at GeekOut this year. This is really interesting API that appeared in Java 8
A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent functions and actions that trigger upon its completion.
Tomasz Nurkiewicz - CompletableFuture in Java 8, asynchronous processing done right. from Official ZeroTurnaround Account on Vimeo.
Some time ago Tomasz published a really nice series of articles at his blog - worth reading!
Java 8: Definitive guide to CompletableFutureJava 8: CompletableFuture in action
And there's more!
