Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-2017 JetBrains s.r.o. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | // This file was automatically generated from coroutines-guide.md by Knit tool. Do not edit. |
Roman Elizarov | a9687a3 | 2018-06-29 17:28:38 +0300 | [diff] [blame] | 18 | package kotlinx.coroutines.experimental.guide.select02 |
Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 19 | |
| 20 | import kotlinx.coroutines.experimental.* |
| 21 | import kotlinx.coroutines.experimental.channels.* |
| 22 | import kotlinx.coroutines.experimental.selects.* |
Roman Elizarov | 9fe5f46 | 2018-02-21 19:05:52 +0300 | [diff] [blame] | 23 | import kotlin.coroutines.experimental.* |
Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 24 | |
| 25 | suspend fun selectAorB(a: ReceiveChannel<String>, b: ReceiveChannel<String>): String = |
| 26 | select<String> { |
| 27 | a.onReceiveOrNull { value -> |
| 28 | if (value == null) |
| 29 | "Channel 'a' is closed" |
| 30 | else |
| 31 | "a -> '$value'" |
| 32 | } |
| 33 | b.onReceiveOrNull { value -> |
| 34 | if (value == null) |
| 35 | "Channel 'b' is closed" |
| 36 | else |
| 37 | "b -> '$value'" |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | fun main(args: Array<String>) = runBlocking<Unit> { |
| 42 | // we are using the context of the main thread in this example for predictability ... |
Roman Elizarov | 43e3af7 | 2017-07-21 16:01:31 +0300 | [diff] [blame] | 43 | val a = produce<String>(coroutineContext) { |
Roman Elizarov | a84730b | 2017-02-22 11:58:50 +0300 | [diff] [blame] | 44 | repeat(4) { send("Hello $it") } |
Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 45 | } |
Roman Elizarov | 43e3af7 | 2017-07-21 16:01:31 +0300 | [diff] [blame] | 46 | val b = produce<String>(coroutineContext) { |
Roman Elizarov | a84730b | 2017-02-22 11:58:50 +0300 | [diff] [blame] | 47 | repeat(4) { send("World $it") } |
Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 48 | } |
| 49 | repeat(8) { // print first eight results |
| 50 | println(selectAorB(a, b)) |
| 51 | } |
Roman Elizarov | 8b38fa2 | 2017-09-27 17:44:31 +0300 | [diff] [blame] | 52 | coroutineContext.cancelChildren() |
Roman Elizarov | d4dcbe2 | 2017-02-22 09:57:46 +0300 | [diff] [blame] | 53 | } |