Kotlin의 코루틴은 어떻게 동작하는가

Speaker. Kotlin ௏ܖ౯਷ যڌѱ ز੘ೞחо? بହ਌ 101

5PEBZsTUPQJD $PSPVUJOF

"TZODISPOPVT

അपࣁ҅੄#MPDLJOH

੉ޙઁܳযڌѱ ೧Ѿ೧ঠೡө

కୡ੄׮নೠߑߨٜ

5ISFBE

#MPDLJOHDPEFܳझۨ٘۽୊ܻ Ӓ5ISFBEܳ࠶۾ೞ૑ঋח׮Ҋחউ೮׮

ೞ૑݅ ߔ݅ѐ੄ झۨ٘о ୹زೞݶযڄө झ ۨ ٘

$PSPVUJOF

$PSPVUJOFTBSFDPNQVUFSQSPHSBN DPNQPOFOUTUIBUHFOFSBMJ[FTVCSPVUJOFTGPS OPOQSFFNQUJWFNVMUJUBTLJOH CZBMMPXJOH NVMUJQMFFOUSZQPJOUTGPSTVTQFOEJOHBOE SFTVNJOHFYFDVUJPOBUDFSUBJOMPDBUJPOT

ޤۄחѢঠ

Ӓۢ੊ࣼೠ ѐ֛ࠗఠ

4VCSPVUJOF

ױੌ૑੼ীࢲद੘ ౠ੿૑੼ীࢲઙܐ

Ӓۢ$PSPVUJOF਷

$PSPVUJOF

੐੄૑੼ীࢲݥ୺ ೧׼૑੼ীࢲ੤ѐ ױੌ૑੼ীࢲद੘ ౠ੿૑੼ীࢲઙܐ ੐੄૑੼ীࢲݥ୺ ೧׼૑੼ীࢲ੤ѐ

Ӓېࢲ ,PUMJO਷

4FRVFODJBMDPEFܳా೧ OPOCMPDLJOH௏٘ܳ੘ࢿೞӝਤೠ ࣻױਵ۽DPSPVUJOFઁҕ औѱ݈೧ࢲ ਗې੘ࢿೞ؍ߑधਵ۽

2Ӓۢযڌѱݥ୿׮ ׮दद੘ೞաਃ

LFZXPSETVTQFOE

fun fetchUserDetail(id: String) { val token = auth() val user
= getUser(token, id) updateUserData(user) } BVUI Waaaaa~~it HFU6TFS VQEBUF6TFS%BUB 8BBBBB__JU

fun fetchUserDetail(id: String) { auth { token -> getUser(token) {
updateUserData(it) } } } BVUI HFU6TFS VQEBUF6TFS%BUB

suspend fun fetchUserDetail(id: String) { val token = auth() val
user = getUser(token, id) updateUserData(user) } suspend BVUI *%-& /POCMPDLJOH HFU6TFS VQEBUF6TFS%BUB *%-& /POCMPDLJOH

2Ӓۢযڌѱݥ୿׮ ׮दद੘ೞաਃ ੿࢝

ೣࣻחযڌѱप೯غա

fun plusOne(initial: Int) : Int { val ONE = 1
var result = initial result += ONE return result }

↟ ־оഐ୹೮ח૑ ↟ য٣ө૑प೯೮ח૑ ↟ যڃчٜਸо૑Ҋ੓ח૑ ࢚క 4UBUF

Ӓۧ׮ݶ ੉࢚కܳ੷੢ೞݶ ׮दद੘ೡࣻ੓૑ঋਸө

$POUJOVBUJPO1BTTJOH4UZMF

$POUJOVBUJPO

$POUJOVBUJPOJTBOBCTUSBDUSFQSFTFOUBUJPO PGUIFDPOUSPMTUBUFPGBDPNQVUFSQSPHSBN "DPOUJOVBUJPOSFJGJFTUIFQSPHSBNDPOUSPMTUBUF JF UIFDPOUJOVBUJPOJTBEBUBTUSVDUVSFUIBUSFQSFTFOUTUIF DPNQVUBUJPOBMQSPDFTTBUBHJWFOQPJOUJOUIFQSPDFTTT FYFDVUJPOUIFDSFBUFEEBUBTUSVDUVSFDBOCFBDDFTTFECZ UIFQSPHSBNNJOHMBOHVBHF JOTUFBEPGCFJOHIJEEFOJO UIFSVOUJNFFOWJSPONFOU$POUJOVBUJPOTBSFVTFGVMGPS
FODPEJOHPUIFSDPOUSPMNFDIBOJTNTJOQSPHSBNNJOH MBOHVBHFTTVDIBTFYDFQUJPOT HFOFSBUPST DPSPVUJOFT BOETPPO

ޤۄחѢঠ

ੋࣻੋ҅ܳࢤп೧ࠇद׮

public interface Continuation<in T> { } public val context: CoroutineContext
public fun resume(value: T) public fun resumeWithException(exception: Throwable)

suspend fun fetchUserDetail(id: String) { val token = auth() val
user = getUser(token, id) updateUserData(user) } }

suspend fun fetchUserDetail(id: String) { // ... switch (label) {
case 0: val token = auth() case 1: val user = getUser(token, id) case 2: updateUserData(user) } }

fun fetchUserDetail(id: String) { // ... switch (label) { case
0: val token = auth() case 1: val user = getUser(token, id) case 2: updateUserData(user) } } -BCFMJOH

fun fetchUserDetail(id: String, cont: Continuation) { switch ( label) {
case 0: auth( ) case 1: getUser(token, id ) case 2: … } } val sm = object : CoroutineImpl { ... } sm. sm , sm 4UBUF.BDIJOF

fun fetchUserDetail(id: String, cont: Contiunation) { val sm = object
: CoroutineImpl { ... } switch (sm.label) { case 0: auth(sm) case 1: getUser(token, id, sm) case 2: … } } $POUJOVBUJPO

: CoroutineImpl { ... } switch (sm.label) { case 0: sm.id = id sm.label = 1 auth(sm) … } } 4BWFTUBUFT

: CoroutineImpl { ... } switch (sm.label) { … case 1: val id = sm.id val token = sm.result as String sm.label = 2 getUser(token, id, sm) … } 3FTUPSFTUBUF

: CoroutineImpl { fun resume(...) { fetchUserDetail(null, this) } } switch (sm.label) { case 0: … } } 3FTVNF DBMMCBDL

fun fetchUserDetail(id: String, cont: Contiunation) { val sm = cont
as? ThisSM ?: object : CoroutineImpl { fun resume(...) { fetchUserDetail(null, this) } } switch (sm.label) { case 0: … } } $POUJOVBUJPO SFVTF

$14USBOTGPSN ↟ 4UBUF.BDIJOFী੄೧௏٘੄प೯ਤ஖୊ܻ ↟ ೣࣻী؀ೠ૓ੑ૓୹द࢚కܳ੷੢ࠂਗೞӝਤೠ௏٘ ↟ $POUJOVBUJPOSFVTF

$PSPVUJOF$POUFYU

public interface Continuation<in T> { } public val context: CoroutineContext
public fun resume(value: T) public fun resumeWithException(exception: Throwable)

যڃझۨ٘ীࢲप೯ೡѪੋо

fun updateUserDetail(id: String) = launch(UI) { val token = auth()
val user = getUser(token, id) updateUserDataOntoUI(user) }

$POUJOVBUJPOJOUFSDFQUPS

class DispatchedContinuation<in T> ( val dispatcher: CoroutineDispatcher, val continuation: Continuation<T>
) : Continuation<T> by continuation { override fun resume(value: T) { dispatcher.dispatch(context, DispatchTask(...)) } ... }

fun launchOnUiThread() { launch(UI) { delay(1000L) ... } } /**
* Dispatches execution onto Android main UI thread * and provides native [delay][Delay.delay] support. */ val UI = HandlerContext(Handler(Looper.getMainLooper()), "UI")

fun main(args: Array<String>) = runBlocking<Unit> { val jobs = arrayListOf<Job>()
jobs += launch(Unconﬁned) { println("'Unconﬁned': I'm working in thread ${Thread.currentThread().name}") } jobs += launch(coroutineContext) { println("'coroutineContext': I'm working in thread ${Thread.currentThread().name}") } jobs += launch(CommonPool) { println("'CommonPool': I'm working in thread ${Thread.currentThread().name}") } jobs += launch(newSingleThreadContext("MyOwnThread")) { println("'newSTC': I'm working in thread ${Thread.currentThread().name}") } jobs.forEach { it.join() } } 6ODPOGJOFE*NXPSLJOHJOUISFBENBJO $PNNPO1PPM*NXPSLJOHJOUISFBE'PSL+PJO1PPMDPNNPO1PPM XPSLFS OFX45$*NXPSLJOHJOUISFBE.Z0XO5ISFBE DPSPVUJOF$POUFYU*NXPSLJOHJOUISFBENBJO

$PSPVUJOFCVJMEFS

য૰؍ ௏ܖ౯द੘җળ࠺ח೙ਃೞ׮

fun main(args: Array<String>) = runBlocking<Unit> { launch { repeat(1000) {
i -> println("I'm sleeping $i ...") delay(500L) } } delay(1300L) // just quit after delay } I'm sleeping 0 ... I'm sleeping 1 ... I'm sleeping 2 ...

fun main(args: Array<String>) = runBlocking<Unit> { val job = launch
{ try { repeat(1000) { i -> println("I'm sleeping $i ...") delay(500L) } } finally { println("I'm running finally") } } delay(1300L) // delay a bit println("main: I'm tired of waiting!") job.cancelAndJoin() // cancels the job and waits for its completion println("main: Now I can quit.") } I'm sleeping 0 ... I'm sleeping 1 ... I'm sleeping 2 ... main: I'm tired of waiting! I'm running finally main: Now I can quit.

fun main(args: Array<String>) = runBlocking<Unit> { withTimeout(1300L) { repeat(1000) {
i -> println("I'm sleeping $i ...") delay(500L) } } } I'm sleeping 0 ... I'm sleeping 1 ... I'm sleeping 2 ... Exception in thread "main" kotlinx.{…}.TimeoutCancellationException …

IUUQTXXXHPPHMFDPLSTFBSDI RLPUMJO DPSPVUJOF CVJMEFS

2৵TVTQFOEGVODUJPO਷TVTQFOE DPSPVUJOFীࢲ݅ഐ୹оמ೧ਃ

5BMLJTDIFBQ 4IPXNFUIFDPEF

ਃড

↟ $PSPVUJOFMJHIUXFJHIUUISFBE ↟ झۨ٘झாે݂١ী؀ೠҊ޹ਸ؏ ↟ ੊ࣼ ࣽର੸ ೠഋక۽OPOCMPDLJOH௏٘੘ࢿ

↟ TVTQFOEח઺ױ੤ѐ૑੼ਸਤೠDPOUJOVBUJPOਸݒೝೞӝਤೠఃਕ٘ ↟ $POUJOVBUJPO઺ױ૑੼١੄प೯࢚కӝ۾୶੸ਸਤೠੋఠಕ੉झ ↟ $POUJOVBUJPOਸೣࣻী੹׳೧ࢲ݃૑݄प೯૑੼ীࢲ௏٘о੤ѐ $14

↟ $PSPVUJOF੄द੘਷#VJMEFS ↟ #VJMEFSীࢲ੹׳ػ$POUFYUоप೯झۨ٘ܳѾ੿ ↟ प೯੄ࣽࢲաݾ੸ীٮۄ$PSPVUJOF#VJMEFSܳࢶఖೞৈࢎਊ ↟ ૒੽݅٘࣊بغחؘҶ੉Ӓۡ೙ਃח

https://goo.gl/2Tyx4B

SVO#MPDLJOH\ UIBOL\ZPV^ RVFTUJPO BXBJU BOTXFS ^

Kotlin의 코루틴은 어떻게 동작하는가

Kotlin의 코루틴은 어떻게 동작하는가

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