What is the best way to get a future into the coro...

# coroutines

[Paul Woitaschek]

What is the best way to get a future into the coroutine world?

[Jonathan]

With a java8 Future, you can use kotlinx-coroutines-jdk8 https://github.com/Kotlin/kotlinx.coroutines/blob/master/integration/kotlinx-coroutines-jdk8/README.md and do either CompletionStage.await or CompletionStage.asDeferred()

[Paul Woitaschek]

With Future I mean just Future.

[Jonathan]

What I said is correct for java.util.concurrent.Future too

[Jonathan]

(But only with Java8)

[Paul Woitaschek]

I don't get it. CompletionStage is != Future?

[Paul Woitaschek]

There is no java.util.concurrent.Future.await()

[Jonathan]

java.util.concurrent.Future implement CompletionStage but only since Java8

[Jonathan]

https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-jdk8/kotlinx.coroutines.experimental.future/java.util.concurrent.-completion-stage/await.html

[Jonathan]

Yes there is an await on CompletionStage. But you have to add kotlinx-coroutines-jdk8 as a dependency of your project

[Jonathan]

no sorry I'm wrong.CompletionStage implements Future

[Jonathan]

but Future doesn't implement CompletionStage. So if you use java.util.concurrent.Future your only option is to create a task to wait on the result: async { future.get() }