Is there any way to convert guava ListenableFuture into Kotlin Deferred? I see that there is an exte...

# coroutines

[Marharyta Nedzelska]

Is there any way to convert guava ListenableFuture into Kotlin Deferred? I see that there is an extension method await on ListenableFuture in kotlin-coroutines-guava but it is not what I need

[diesieben07]

val deferred = async { future.await() }

[Vsevolod Tolstopyatov [JB]]

also, you can use LF’s callback:

fun <T> ListenableFuture<T>.toDeferred(): Deferred<T?>  {
        val deferred = CompletableDeferred<T?>()
        Futures.addCallback(this, object : FutureCallback<T> {
            override fun onSuccess(result: T?) {
                deferred.complete(result)
            }

            override fun onFailure(t: Throwable?) {
                deferred.completeExceptionally(t!!)
            }
        } )
        return deferred
    }

to avoid unnecessary launch (~context switch)

[Marharyta Nedzelska]

thank you

[enleur]

https://github.com/Kotlin/kotlinx.coroutines/blob/master/integration/kotlinx-coroutines-guava/README.md

ListenableFuture.await()