Stack Overflow Answer https://stackoverflow.com/questions/65197276/

gistfile1.txt

import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*
import kotlin.random.Random

fun main() = runBlocking {
    val providers: List<Provider> = listOf(Provider("p1"), Provider("p2"), Provider("p3"))
    println(executeAllProviderAsync(providers))
}

suspend fun executeAllProviderAsync(providers: List<Provider>): List<Int> = withContext(Dispatchers.Default){
    return@withContext providers.map {
        async { it.execute() }
    }.awaitAll().flatten()
}

class Provider(private val name: String) {
    suspend fun execute(): List<Int> = withContext(Dispatchers.Default) {
        val delay = Random.nextLong(500, 2500)
        println("execute Provider '$name' with delay: $delay")
        delay(delay)
        return@withContext listOf(Random.nextInt(), Random.nextInt())
    }
}