my company needs a future type (on Java 7, so no `...

# coroutines

[zak.taccardi]

my company needs a future type (on Java 7, so no CompletableFuture<T>. But we have mixed kotlin/java code. Does that mean we cannot use Deffered<T>?

[r4zzz4k]

The most important method of Deferred<T> is await(), which is suspend function. As you may know, you can't invoke such functions from Java code. So I believe your best bet is to use kotlinx-coroutines-guava module which binds Guava's ListenableFuture (available for Java 7) and coroutines(https://github.com/Kotlin/kotlinx.coroutines/tree/master/integration/kotlinx-coroutines-guava).

If the size of the Guava is a concern and it's not used in the project otherwise, it might be an option to pull in streamsupport library (https://github.com/streamsupport/streamsupport) -- it has backport of CompletableFuture<T> for previous Java versions. You'll have to provide coroutine wrappers yourself though, because package name is different, so kotlinx-coroutines-jdk8 won't work as is. You might be able to just repackage jar changing package name.