Is it possible to make the equivalent of an immediate execut kotlinlang #coroutines

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Title

simon.vergauwen

12/30/2018, 10:56 PM

Is it possible to make the equivalent of an immediate executor but a

CoroutineContext

without depending on

coroutines-core

but only on what can be found in

std-lib

bdawg.io

12/30/2018, 11:40 PM

Isn't CoroutineContext defined by coroutines-core?

What do you mean by an "immediate executor"?

Dico

12/31/2018, 1:40 AM

You have to implement

ContinuationInterceptor

and put it in the context

CoroutineContext

can be found in the std lib, it is not part of kotlinx library.

simon.vergauwen

12/31/2018, 9:34 AM

@bdawg.io I need an executor that executes the code on immediately on the current thread. Something like Guava directExecutor.

final class DirectExecutor implements Executor {
   public void execute(Runnable r) {
     r.run();
   }
 }

Dico

12/31/2018, 9:36 AM

Then I suggest

override fun interceptContinuation(cont: Continuation<*>) = cont

Excuse me if that's not the signature

simon.vergauwen

12/31/2018, 9:41 AM

Alright thanks, I’ll look into that 🙂 What are you supposed to do with those keys?

Dico

12/31/2018, 9:42 AM

Look at documentation of

CoroutineContext

simon.vergauwen

12/31/2018, 9:44 AM

😅 Thanks!

Dico

12/31/2018, 9:45 AM

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines/-continuation-interceptor/index.html

The key that you need is here

simon.vergauwen

12/31/2018, 9:49 AM

Could you help clarify how returning the

continuation

like so

override fun <T> interceptContinuation(continuation: Continuation<T>): Continuation<T> = continuation

executes it on the immediate thread?

The interception they refer to in the docs, does that mean intercept to coroutine to execute it on some other context? Thus intercepting all resumptions to that new context as well.

Dico

12/31/2018, 9:51 AM

The intercepted continuation optionally wraps the original, scheduling it to be resumed on a thread or in some event loop

simon.vergauwen

12/31/2018, 9:53 AM

Alright, thanks a lot for the help 🙂

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