what s the closest thing in java to `suspend fun getAThingTh

Question

what s the closest thing in java to `suspend fun getAThingThatMayTakeTime T` `fun getAThing Future lt T gt `

jw · Answer

More like CompletableFuture or ListenableFuture or RxJava s Single

Dominaezzz · Answer

`fun getAThing cont Continuation lt T gt ` stuck out tongue

Marko Mitic · Answer

Followup is there any easy way to wrap suspend call into Future ListenableFuture on Android

Marko Mitic · Answer

Ok i see this <https kotlin github io kotlinx coroutines kotlinx coroutines jdk8 kotlinx coroutines future kotlinx coroutines deferred as completable future html>

Marko Mitic · Answer

is it safe to use on Android with limited java 8 api

Marko Mitic · Answer

I ll assume it s not smile

Dominaezzz · Answer

From java or from kotlin

Dominaezzz · Answer

Are you trying to allow java call your kotlin suspend function

Dominaezzz · Answer

If you want to explicitly support java don t bother with suspension

Dominaezzz · Answer

Just use `GlobalScope future`

diesieben07 · Answer

Nothing wrong with using suspension in your kotlin code that s what the adapters like `future` etc are for

diesieben07 · Answer

You can write normal suspend functions and then adapter methods for calling from Java

Dominaezzz · Answer

Do you have any examples

diesieben07 · Answer

``` suspend fun doStuff fun doStuffJava = GlobalScope future doStuff ```

diesieben07 · Answer

This way both Kotlin and Java can call it idiomatically

Marko Mitic · Answer

Yeah I m trying to let java call my suspend API indirectly

diesieben07 · Answer

`future` and other helpers are the way to go then

Marko Mitic · Answer

I don t see `GlobalScope future` what dependency do I need for that

diesieben07 · Answer

For CompletableFuture <https github com Kotlin kotlinx coroutines tree master integration kotlinx coroutines jdk8>

diesieben07 · Answer

There is also one for guava giving a wrapper for ListenableFuture

diesieben07 · Answer

Dominaezzz · Answer

What about interfaces

diesieben07 · Answer

What about them

Marko Mitic · Answer

I don t have full Java8 API on android I don t think I can use `kotlinx coroutines jdk8` I ll try implementing something myself

diesieben07 · Answer

You do need some kind of future if you want to use it from Java

diesieben07 · Answer

If you can t use Api level 24 not quite sure how this works on Android then you should use Guava

Dominaezzz · Answer

How do you provide an adapter without repeating yourself

diesieben07 · Answer

I don t think you can You have to explicitly design for Java interop with coroutines

Dominaezzz · Answer

Guava comes with androidx In some form

jw · Answer

It does not

jw · Answer

There is a ListenableFuture artifact which provides a SettableFuture that you can use

jw · Answer

Definitely do not expose just a Future It is an entirely useless type

Marko Mitic · Answer

blocking call it is thank you everybody