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Briefly Introduction of Kotlin coroutines
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Elvis Lin
October 19, 2018
Programming
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270
Briefly Introduction of Kotlin coroutines
Introduce basic concepts of Kotlin coroutines
Elvis Lin
October 19, 2018
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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