unless I have to do this ``` return templates map renderTemp kotlinlang #coroutines

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Title

m

marcelo

11/05/2018, 2:20 PM

unless I have to do this:

return templates.map { renderTemplatePath -> 
  runBlocking {
    val result = async {
      renderMetricTimer.tagVal(package).time {
        //code
      }
    }
    result.await()
 }.toSet()
}

Obviously, I am new to coroutines, but this seems like a lot of coroutine builders, no?

s

spand

11/05/2018, 2:21 PM

Why do you run something in async if you await it immediately after?

m

marcelo

11/05/2018, 2:22 PM

the

timer

function is a

suspend

function.

suspend fun <T> NeedsTag1<BooleanTagValue, Timer>.time(toTime: suspend () -> T): T {
    val timerStarted = this.start()
    try {
        val result = toTime()
        timerStarted.tagVal(true).stop()
        return result
    } catch (e: Throwable) {
        timerStarted.tagVal(false).stop()
        throw e
    }
}`

s

spand

11/05/2018, 2:22 PM

You can call suspend functions from inside runBlocking

m

marcelo

11/05/2018, 2:23 PM

OH, and avoid the

async

??

s

spand

11/05/2018, 2:23 PM

Yes. Async is for parallel work only

👍 1

m

marcelo

11/05/2018, 2:24 PM

I'm still confuse on those. I thought that would use

async

when I need to return something.

n

nulldev

11/05/2018, 3:36 PM

Nah, you can just do:

runBlocking {
    renderMetricTimer.tagVal(package).time {
        //code
    }
}.toSet()

👍 1

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