Does Vertx 3 support CompletableFuture?

Question

I want to develop my application promise style using vertx and CompletableFuture fits really for this purpose but JVM uses fork/join on the background for CompletableFuture and this may break Vertx Thread Safety.

Do you have any idea or have used this feature on your project?

Answer 1

There is also https://github.com/cescoffier/vertx-completable-future. From the README:

This project provides the Completable Future API but enforces the Vert.x threading model:

• When using xAsync methods (without executor), the callbacks are called on the Vert.x context
• When using non-async, it uses the caller thread. If it's a Vert.x thread the same thread is used. If not called from a Vert.x thread, it still uses the caller thread
• When using xAsync methods with an Executor parameter, this executor is used to execute the callback (does not enforce the Vert.x thread system)

Haven't used yet, though.

Answer 2

Yes it does, here is an example http://qrman.github.io/posts/2015/08/28/callback_hell_completablefuture_ftw/

But I think JavaRx is the better solution because its supported as first class citizen by vert.x http://vertx.io/docs/vertx-rx/java/