Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Briefly Introduction of Kotlin coroutines
Search
Elvis Lin
October 19, 2018
Programming
1
280
Briefly Introduction of Kotlin coroutines
Introduce basic concepts of Kotlin coroutines
Elvis Lin
October 19, 2018
Tweet
Share
More Decks by Elvis Lin
See All by Elvis Lin
Protect Users' Privacy in iOS 14
elvismetaphor
0
49
Dubugging Tips and Tricks for iOS development
elvismetaphor
0
50
Strategies of Facebook LightSpeed project
elvismetaphor
0
79
Background Execution And WorkManager
elvismetaphor
2
480
作為一個跨平台的 Mobile App 開發者,從入門到放棄!?
elvismetaphor
2
500
Dependency Injection for testability of iOS app
elvismetaphor
1
1.4k
MotionLayout Brief Introduction
elvismetaphor
1
330
Chapter 10. Pattern Matching with Regular Expressions
elvismetaphor
0
46
Machine Learning Application on Mobile Devices
elvismetaphor
0
100
Other Decks in Programming
See All in Programming
XP, Testing and ninja testing
m_seki
3
240
iOS 26にアップデートすると実機でのHot Reloadができない?
umigishiaoi
0
130
地方に住むエンジニアの残酷な現実とキャリア論
ichimichi
5
1.5k
ペアプロ × 生成AI 現場での実践と課題について / generative-ai-in-pair-programming
codmoninc
1
18k
10 Costly Database Performance Mistakes (And How To Fix Them)
andyatkinson
0
330
ニーリーにおけるプロダクトエンジニア
nealle
0
830
MDN Web Docs に日本語翻訳でコントリビュートしたくなる
ohmori_yusuke
1
120
脱Riverpod?fqueryで考える、TanStack Queryライクなアーキテクチャの可能性
ostk0069
0
120
AIともっと楽するE2Eテスト
myohei
6
2.6k
新メンバーも今日から大活躍!SREが支えるスケールし続ける組織のオンボーディング
honmarkhunt
5
7.2k
Rubyでやりたい駆動開発 / Ruby driven development
chobishiba
1
700
なぜ適用するか、移行して理解するClean Architecture 〜構造を超えて設計を継承する〜 / Why Apply, Migrate and Understand Clean Architecture - Inherit Design Beyond Structure
seike460
PRO
3
760
Featured
See All Featured
How to Think Like a Performance Engineer
csswizardry
25
1.7k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
35
2.4k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.5k
Music & Morning Musume
bryan
46
6.6k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.8k
Building Adaptive Systems
keathley
43
2.7k
Raft: Consensus for Rubyists
vanstee
140
7k
Transcript
Kotlin Coroutines, 從入⾨門到入⾨門 Elvis Lin(@elvismetaphor) Taiwan 2018 #JCConf
關於我 • Elvis Lin • Android, iOS 與 React Native
永遠的初學者 • Twitter: @elvismetaphor • Blog: https://blog.elvismetaphor.me #JCConf Taiwan 2018
⼤大綱 • 循序處理理 • 並⾏行行處理理與Multi-thread • Why Coroutines? • 基本的使⽤用⽅方式
#JCConf Taiwan 2018
循序處理理 #JCConf Taiwan 2018 Main
循序處理理的程式 fun main(args: Array<String>) { println("First") println("Second") println(“Third") } #JCConf
Taiwan 2018
循序處理理的程式與Thread fun main(args: Array<String>) { println("First") printDelayed(“Second") println("Third") } fun
printDelayed(message: String) { Thread.sleep(1000) println(message) } #JCConf Taiwan 2018
循序處理理的程式與 Coroutines fun main(args: Array<String>) { println(“First") runBlocking { printDelay("Second")
} println("Third") } suspend fun printDelay(message: String) { delay(1000) println(message) } #JCConf Taiwan 2018
循序處理理的程式 與 Coroutines(簡易易版) fun main(args: Array<String>) { println(“First") runBlocking {
delay(1000) println(“Second”) } println("Third") } #JCConf Taiwan 2018
並⾏行行處理理 (Multi-thread) #JCConf Taiwan 2018 Main Other
並⾏行行處理理的程式與 Thread fun main(args: Array<String>) { println("First") printNonBlocking("Second") println("Third") }
fun printNonBlocking(message: String) { Thread { Thread.sleep(1000) println(message) }.start() } // Output: First Third Second
並⾏行行處理理的程式與 coroutines fun main(args: Array<String>) { println("First") launch { printDelay("Second")
} println("Three") } suspend fun printDelay(message: String) { delay(1000) println(message) } // Output: First Third Second #JCConf Taiwan 2018
Why Coroutines #JCConf Taiwan 2018
Coroutines • Coroutines are like very light-weight thread • Coroutines
computations can be done without blocking other threads. • Coroutine 的執⾏行行可以更更有效地利利⽤用原本已經建立在 ThreadPool 裡⾯面的 Threads #JCConf Taiwan 2018
常⽤用的關鍵字 • suspend • delay • launch • runBlocking •
await • async #JCConf Taiwan 2018
suspend • ⼀一個 modifier • ⼀一個 suspend 的 function 只可以被
suspend function 或另⼀一 個 coroutine 呼叫 #JCConf Taiwan 2018
launch • 執⾏行行⼀一個 async 的 job #JCConf Taiwan 2018 launch
{ anSimpleFunction() }
runBlocking • 執⾏行行⼀一個 sync 的 job #JCConf Taiwan 2018 runBlocking
{ anSimpleFunction() }
async & await • aysnc {…} 會回傳⼀一個 Deferred<T> • 在回傳的
deferred 上⾯面加上 await 會獲得值 #JCConf Taiwan 2018 val value = async {calculate(1)}.await()
Live Demo https://gist.github.com/elvismetaphor/ 810712e3a08863c963c871f1bca0b3f2 #JCConf Taiwan 2018
Coroutines v.s. RxJava • Coroutines: 更更輕量量,更更容易易將原本循序式的程式改成非同 步、並⾏行行處理理的⽅方式 • RxJava: 提供更更豐富的
operators 做 stream 的轉換 • 根據你的使⽤用情境挑選適合的 library #JCConf Taiwan 2018
總結 • Coroutine 提供⼀一個類似 Thread 的功能,但是更更輕量量的操 作 • Coroutine 讓你可以容易易的將原本同步操作的邏輯轉換成非
同步操作的邏輯 #JCConf Taiwan 2018
參參考資料 • https://kotlinlang.org/docs/reference/coroutines- overview.html • Introduction to coroutines: https://youtu.be/_hfBv0a09Jc •
Exploring coroutines in Kotlin: https://youtu.be/ jT2gHPQ4Z1Q #JCConf Taiwan 2018
Thank you :) #JCConf Taiwan 2018