async Java SDK

[adamstormpath]

.net is async, also got feedback from customer (colisweb) and partner (nginx) about the need.

per Micah on timing - Once we make the call to end support for Java 7, we can start working with the Java 8 Futures interface for async probably a 2.0 sort of thing

[lhazlewood]

This is a substantial amount of work - it would probably take a solid month or two of refactoring and testing to do this. I'm not saying we shouldn't do this (we should!) - just letting you know what we're up against.

[lhazlewood]

There is a workaround for customers needing async with our current SDK, albeit it's not too easy: delegate calls to our SDK to an ExecutorService and use promises (aka CompletableFuture) to call back into the calling code when the operation is complete.