| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // This file was automatically generated from coroutines-guide.md by Knit tool. Do not edit. |
| package guide.compose.example04 |
| |
| import kotlinx.coroutines.experimental.* |
| import kotlin.system.measureTimeMillis |
| |
| suspend fun doSomethingUsefulOne(): Int { |
| delay(1000L) // pretend we are doing something useful here |
| return 13 |
| } |
| |
| suspend fun doSomethingUsefulTwo(): Int { |
| delay(1000L) // pretend we are doing something useful here, too |
| return 29 |
| } |
| |
| // The result type of asyncSomethingUsefulOne is Deferred<Int> |
| fun asyncSomethingUsefulOne() = async { |
| doSomethingUsefulOne() |
| } |
| |
| // The result type of asyncSomethingUsefulTwo is Deferred<Int> |
| fun asyncSomethingUsefulTwo() = async { |
| doSomethingUsefulTwo() |
| } |
| |
| // note, that we don't have `runBlocking` to the right of `main` in this example |
| fun main(args: Array<String>) { |
| val time = measureTimeMillis { |
| // we can initiate async actions outside of a coroutine |
| val one = asyncSomethingUsefulOne() |
| val two = asyncSomethingUsefulTwo() |
| // but waiting for a result must involve either suspending or blocking. |
| // here we use `runBlocking { ... }` to block the main thread while waiting for the result |
| runBlocking { |
| println("The answer is ${one.await() + two.await()}") |
| } |
| } |
| println("Completed in $time ms") |
| } |