Is awaitAll workitg as expected here I have 10 Deferred in m

Question

Is awaitAll workitg as expected here I have 10 Deferred in my responses list highlighted in terminal The weird thind that they all are marked as completed But I can iterate only to a lesser amount at the end There are only 3 in the output BTW if I uncomment delay 6000 I ll see all 10 responses What am I doing wrong

tseisel · Answer

This may be related to awaiting i a different `runBlocking` block than the one where you launched your `async` coroutines On what dispatcher are you launching coroutines Is it single threaded Be aware that you should try to avoid using `runBlocking` it has been designed to bridge normal code to the coroutine world in specific situations for example the `main` function

gammanik · Answer

I m calling it from `main` function and I wasn t setting a dispatcher explicidly This is the only one `runBlocking` in the program

tseisel · Answer

Could you please share the declaration of the `responses` variable that I expect to be of type `List lt Deferred lt Collection lt Person gt gt gt `

gammanik · Answer

Sure ```val responses ArrayList lt Deferred lt Collection lt Person gt gt gt = ArrayList ```

gammanik · Answer

```for passenger in passengers val suggestedDrivers = suggestDriversAsync passenger drivers println Passenger point $ passenger finishPoint latitude $ passenger finishPoint longitude GlobalScope launch responses add suggestedDrivers runBlocking val res List lt Collection lt Person gt gt = responses awaitAll for el in res println el ```

tseisel · Answer

Some remarks 1 You should try to wrap the whole code in `runBlocking` for example ```fun main = runBlocking lt Unit gt val responses = val res = responses awaitAll ``` 2 Why launch a coroutine in `GlobalScope` to add `suggestedDrivers` to the list Its not an operation that requires calling suspend functions

gammanik · Answer

`suggestDriversAsync` returns `Deferred lt Collection lt Person gt gt ` If I wrap the whole code in `runblocking` I ll send requests syncroniously I guess So I wanted to send all the requests at once and then wait when they all are gonna be finished

tseisel · Answer

I wrote this sample based on your code <https pl kotl in N0HVVa2T5>

gammanik · Answer

Thank you Great example I ve just added `<http Dispatchers IO|Dispatchers IO>` to `async` and now it s perfect