>It's funny. For all the useless Java "factory" patterns, the one thing there ISN'T a factory for - Futures[...]. >It's a bit of a puzzle to me why this isn't just standardized.

It kind of is. A `FutureFactory` it's pretty much `IO` (as in, Haskell's IO).

It just so happens that a lot of implementations don't want you to call `unsafeRun` (so that `unsafeRun` in only called at the edge of the world) and some implemetations don't like, but nothing stops you from having a `unsafeRunToFuture` that returns a `Future`. This is actually pretty common in Scala.

Some examples:

- Cats-effect: https://typelevel.org/cats-effect/datatypes/io.html#unsafeto...

- ZIO: https://javadoc.io/doc/dev.zio/zio_2.12/latest/zio/Runtime.h...

- Monix: https://monix.io/api/current/monix/eval/Task.html#runToFutur...

I guess that this is not very standardized in OOP languages because they lack some of the ergonomics to use such factories (namely, do-notation).