| /* |
| * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. |
| */ |
| |
| // This file was automatically generated from coroutines-guide.md by Knit tool. Do not edit. |
| package kotlinx.coroutines.guide.select02 |
| |
| import kotlinx.coroutines.* |
| import kotlinx.coroutines.channels.* |
| import kotlinx.coroutines.selects.* |
| |
| suspend fun selectAorB(a: ReceiveChannel<String>, b: ReceiveChannel<String>): String = |
| select<String> { |
| a.onReceiveOrNull { value -> |
| if (value == null) |
| "Channel 'a' is closed" |
| else |
| "a -> '$value'" |
| } |
| b.onReceiveOrNull { value -> |
| if (value == null) |
| "Channel 'b' is closed" |
| else |
| "b -> '$value'" |
| } |
| } |
| |
| fun main() = runBlocking<Unit> { |
| val a = produce<String> { |
| repeat(4) { send("Hello $it") } |
| } |
| val b = produce<String> { |
| repeat(4) { send("World $it") } |
| } |
| repeat(8) { // print first eight results |
| println(selectAorB(a, b)) |
| } |
| coroutineContext.cancelChildren() |
| } |