I have code that basicaly looks like this: ```some...

# coroutines

[Pitel]

I have code that basicaly looks like this:

someFlow.collect {
  Log.d(TAG, ">")
  // Some stuff
  Log.d(TAG, "<")
}

So, I should in Android's logcat alternating arrows going left and right. And in most cases, I do. But on some rare occasions, I see 2 going right and 2 going left. Any idea why that might happen?!

[myanmarking]

two possible answers that i can think of. First, ‘some stuff’ is cancellable, and you have some ‘latest’ operator above in the chain. Or second, the logcat is not reliable and messes the order sometimes.

[Pitel]

Hmm, ther is actualy conflate above the collect. But, it shouldn't cause the cancelation, no?

[Pitel]

And even if id did, Then should just see the first arrow, and not the last, right? But I always see the correct number of pairs, but just the ordering is wrong.

[myanmarking]

yes, it may be possible logcagt messes up the order

[myanmarking]

just add the timestamp before the arrow

[myanmarking]

then confirm even out of order the stamp is ordered

[Pitel]

Good idea with those timestamps! Gonna try it. But I'm afraid logging is correc, because when this "glitch" happens, I see actual error in displayed data in my app.

[Pitel]

Yup, the manual timestamps in logs are oredered correctly.

[bezrukov]

try to verify these logs come from the same coroutine:

someFlow.collect {
  val identity = Random.nextInt()
  Log.d(TAG, "> $identity")
  // Some stuff
  Log.d(TAG, "< $identity")
}

[yschimke]

Maybe helpful to have a second one outside the collect call, to show they are from the same flow you are collecting from.

[bezrukov]

yes, as Yuri said, this one will show you the full picture:

val identity = Random.nextInt()
someFlow.collectIndexed { index, value ->
  Log.d(TAG, "> $identity => $index")
  // Some stuff
  Log.d(TAG, "< $identity => $index")
}