Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +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.compose04 |
Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +0300 | [diff] [blame] | 19 | |
Roman Elizarov | 9669578 | 2017-10-01 10:48:15 -0700 | [diff] [blame] | 20 | import kotlinx.coroutines.experimental.* |
Roman Elizarov | 9fe5f46 | 2018-02-21 19:05:52 +0300 | [diff] [blame] | 21 | import kotlin.system.* |
Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +0300 | [diff] [blame] | 22 | |
| 23 | suspend fun doSomethingUsefulOne(): Int { |
| 24 | delay(1000L) // pretend we are doing something useful here |
| 25 | return 13 |
| 26 | } |
| 27 | |
| 28 | suspend fun doSomethingUsefulTwo(): Int { |
| 29 | delay(1000L) // pretend we are doing something useful here, too |
| 30 | return 29 |
| 31 | } |
| 32 | |
Marcin Moskała | 7e94e70 | 2018-01-29 18:39:02 +0100 | [diff] [blame] | 33 | // The result type of somethingUsefulOneAsync is Deferred<Int> |
| 34 | fun somethingUsefulOneAsync() = async { |
Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +0300 | [diff] [blame] | 35 | doSomethingUsefulOne() |
| 36 | } |
| 37 | |
Marcin Moskała | 7e94e70 | 2018-01-29 18:39:02 +0100 | [diff] [blame] | 38 | // The result type of somethingUsefulTwoAsync is Deferred<Int> |
| 39 | fun somethingUsefulTwoAsync() = async { |
Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +0300 | [diff] [blame] | 40 | doSomethingUsefulTwo() |
| 41 | } |
| 42 | |
| 43 | // note, that we don't have `runBlocking` to the right of `main` in this example |
| 44 | fun main(args: Array<String>) { |
| 45 | val time = measureTimeMillis { |
| 46 | // we can initiate async actions outside of a coroutine |
Marcin Moskała | 7e94e70 | 2018-01-29 18:39:02 +0100 | [diff] [blame] | 47 | val one = somethingUsefulOneAsync() |
| 48 | val two = somethingUsefulTwoAsync() |
Roman Elizarov | 32d9532 | 2017-02-09 15:57:31 +0300 | [diff] [blame] | 49 | // but waiting for a result must involve either suspending or blocking. |
| 50 | // here we use `runBlocking { ... }` to block the main thread while waiting for the result |
| 51 | runBlocking { |
| 52 | println("The answer is ${one.await() + two.await()}") |
| 53 | } |
| 54 | } |
| 55 | println("Completed in $time ms") |
| 56 | } |