完全に理解した気になる Kotlin Coroutines

by takahirom

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㸣Ⰻח椚鍑׃׋孡חז׷ ,PUMJO$PSPVUJOFT UBLBIJSPN

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˖ UBLBIJSPN !OFX@SVOOBCMF דׅկ ˖ 劤せכ嬁「䃨峔 ׭׿ׄױ׋ַמ׹ דׅկ ˖ "OESPJEָ㥨ֹדׅ ˖ "CFNB57ך"OESPJE،فٔ׾⡲׏גְתׅկ ˖ 2JJUBח׮剅ְ׋ךדծ׉׸׾鋅זָ׵耀ְג ֻ׌ְׁկ ˖ IUUQTRJJUBDPNUBLBIJSPNJUFNT CBBEDDGCB 荈ⴓחאְג

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$PSPVUJOFTך 椚鍑ָꨇ׃ְ

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⢪׻׸׷$PSPVUJOFTך"1*

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO ˖ TVTQFOE$PSPVUJOF

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO ˖ TVTQFOE$PSPVUJOF ˖ $PSPVUJOF%JTQBUDIFS

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO ˖ TVTQFOE$PSPVUJOF ˖ $PSPVUJOF%JTQBUDIFS ˖ %FGFSSFE

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO ˖ TVTQFOE$PSPVUJOF ˖ $PSPVUJOF%JTQBUDIFS ˖ %FGFSSFE ˖ 6ODPOOFE

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⢪׻׸׷$PSPVUJOFTך"1* ˖ MBVODI ˖ BTZOD ˖ BXBJU ˖ XJUI$POUFYU ˖ $PSPVUJOF$POUFYU ˖ $PNNPO1PPM ˖ $POUJOVBUJPO ˖ TVTQFOE$PSPVUJOF ˖ $PSPVUJOF%JTQBUDIFS ˖ %FGFSSFE ˖ 6ODPOOFE ˖ BOESPJE6* ˖ %FGBVMU%JTQBUDIFS

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㢳ְ

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ת׆כ㛇劤涸זהֿ׹ַ׵ ׍ׯ׿ה椚鍑׃׋ְ

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MBVODI launch { println("thread:"+Thread.currentThread()) } MBVODIדDPSPUVJOF׾饯⹛ׅ׷

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MBVODI launch { println("thread:"+Thread.currentThread()) } thread:Thread[ForkJoinPool.commonPool-worker-2,5,main] MBVODIדDPSPUVJOF׾饯⹛ׅ׷

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MBVODI launch { println("thread:"+Thread.currentThread()) } thread:Thread[ForkJoinPool.commonPool-worker-2,5,main] ֿ̓ך5ISFBEכוַֿ׵勻׋ MBVODIדDPSPUVJOF׾饯⹛ׅ׷

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MBVODI launch { println("thread:"+Thread.currentThread()) } thread:Thread[ForkJoinPool.commonPool-worker-2,5,main] MBVODIדDPSPUVJOF׾饯⹛ׅ׷ MBVODIך⚥׾鋅ח遤ֲֿ

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MBVODI ך⚥魦 public fun launch( context: CoroutineContext = DefaultDispatcher, start: CoroutineStart = CoroutineStart.DEFAULT, parent: Job? = null, onCompletion: CompletionHandler? = null, block: suspend CoroutineScope.() -> Unit ): Job { 㹋כ$PSPVUJOF$POUFYUד㹋遤ׅ׷5ISFBEָ寸ת׷

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MBVODI ך$PSPVUJOF$POUFYU public fun launch( context: CoroutineContext = DefaultDispatcher, start: CoroutineStart = CoroutineStart.DEFAULT, parent: Job? = null, onCompletion: CompletionHandler? = null, block: suspend CoroutineScope.() -> Unit ): Job { 䒷侧ך$PSPVUJOF$POUFYUכرؿٕؓزד%FGBVMU%JTQBUDIFS 植朐כ%FGBVMU%JTQBUDIFSכ$PNNPO1PPM public val DefaultDispatcher: CoroutineDispatcher = CommonPool

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MBVODI ך$PSPVUJOF$POUFYU public fun launch( context: CoroutineContext = DefaultDispatcher, start: CoroutineStart = CoroutineStart.DEFAULT, parent: Job? = null, onCompletion: CompletionHandler? = null, block: suspend CoroutineScope.() -> Unit ): Job { $PNNPO1PPM public val DefaultDispatcher: CoroutineDispatcher = CommonPool

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MBVODI ד⢪׻׸גְ׷ $PNNPO1PPM object CommonPool : CoroutineDispatcher() { override fun dispatch( context: CoroutineContext, block: Runnable ) = try { (pool ?: getOrCreatePoolSync()).execute(timeSource.trackTask(block)) } … $PNNPO1PPMך EJTQBUDIًاحسָㄎל׸׷

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知⽃ז  %JTQBUDIFS׾⡲׏ג׫׷

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鑐׃ח$PSPVUJOF%JTQBUDIFS׾  ⡲׏ג׫׷ class MyDispatcher : CoroutineDispatcher() { override fun dispatch(context: CoroutineContext, block: Runnable) { println("dispatch:before") block.run() println("dispatch:after") } } launch(MyDispatcher()) { println("thread:"+Thread.currentThread()) } $PSPVUJOF%JTQBUDIFS׾竰䪫׃׋ؙٓأ׾⡲׷

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class MyDispatcher : CoroutineDispatcher() { override fun dispatch(context: CoroutineContext, block: Runnable) { println("dispatch:before") block.run() println("dispatch:after") } } launch(MyDispatcher()) { println("thread:"+Thread.currentThread()) } EJTQBUDICFGPSF UISFBE5ISFBE EJTQBUDIBGUFS ׉ךתתךأٖحسד 㹋遤דֹ׋

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$PSPVUJOFT׏ג5ISFBEה ずׄדכ

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$PSPVUJOFTחכ  ⚥倖ָ֮׷

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⚥倖 class MyDispatcher : CoroutineDispatcher() { val executor = Executors.newSingleThreadExecutor() override fun dispatch(context: CoroutineContext, block: Runnable) { executor.execute { println("dispatch:before") block.run() println("dispatch:after") } } } launch(MyDispatcher()) { println("1:" + Thread.currentThread()) suspendCoroutine { continuation -> thread { // ී௨ʹthreadΛ࡞࣮ͬͯߦ͢Δ // தஅ͞ΕͨCoroutinesΛ࠶։͢Δ continuation.resume("test") } } println("2:" + Thread.currentThread()) } 㹋ꥷך⹛ֹח  さ׻ׇ׷׋׭ ➙㔐ך⢽דכ FYFDVUPS׾⢪ֲ

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class MyDispatcher : CoroutineDispatcher() { val executor = Executors.newSingleThreadExecutor() override fun dispatch(context: CoroutineContext, block: Runnable) { executor.execute { println("dispatch:before") block.run() println("dispatch:after") } } } launch(MyDispatcher()) { println("1:" + Thread.currentThread()) suspendCoroutine { continuation -> thread { // ී௨ʹthreadΛ࡞࣮ͬͯߦ͢Δ // தஅ͞ΕͨCoroutinesΛ࠶։͢Δ continuation.resume("test") } } println("2:" + Thread.currentThread()) } TVTQFOE$PSPVUJOF ׾⢪ֲה DPSPVUJOFT⚥倖דֹ׷

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override fun dispatch(context: CoroutineContext, block: Runnable) executor.execute { println("dispatch:before") block.run() println("dispatch:after") } } } launch(MyDispatcher()) { println("1:" + Thread.currentThread()) suspendCoroutine { continuation -> thread { // ී௨ʹthreadΛ࡞࣮ͬͯߦ͢Δ // தஅ͞ΕͨCoroutinesΛ࠶։͢Δ continuation.resume("test") } } println("2:" + Thread.currentThread()) } ⚥倖⵸ה⚥倖䖓ךⱄꟚד 㔐5ISFBE1PPMד 㹋遤ׁ׸גְ׷ EJTQBUDICFGPSF 5ISFBE EJTQBUDIBGUFS ͜͜ͰҰ౓தஅ EJTQBUDICFGPSF 5ISFBE EJTQBUDIBGUFS

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"OESPJEד 㹋ꥷוֲ⢪ֲ

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } "1*ַ׵《䖤׃גծ׉ךⰻ㺁׾4OBDLCBSח⳿ׅ⢽

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } "1*ַ׵《䖤׃גծ׉ךⰻ㺁׾4OBDLCBSח⳿ׅ⢽ 6*ծծ

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val UI = HandlerContext(Handler(Looper.getMainLooper()), “UI") public class HandlerContext( private val handler: Handler, private val name: String? = null ) : CoroutineDispatcher(), Delay { … override fun dispatch(context: CoroutineContext, block: Runnable) { handler.post(block) } launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } "OESPJEך)BOEMFS׾⡲׷

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() }

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } GFUDI ך⚥כ

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } Api.kt interface ApiSearvice { @GET("/") fun fetchDeferrd(@Query("zipcode") zipCode: String = "1000000"): Deferred } val service = retrofit.create(ApiSearvice::class.java) suspend fun fetch(): Response { return service.fetchDeferrd().await() } SFUSPULPUMJODPSPVUJOFTBEBQUFS׾⢪ֲה  %FGFSSFE׾鵤ׅ

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } Api.kt interface ApiSearvice { @GET("/") fun fetchDeferrd(@Query("zipcode") zipCode: String = "1000000"): Deferred } val service = retrofit.create(ApiSearvice::class.java) suspend fun fetch(): Response { return service.fetchDeferrd().await() } %FGFSSFEכBXBJU ׅ׷ֿהד穠卓׾《䖤דֹ׷ BXBJU ׾ㄎעֿהדDPSPVUJOFTָ⚥倖׃גծ 0L)UUQך鸐⥋أٖحسד《䖤׃גծ 《䖤דֹ如痥ⱄꟚׅ׷կ

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } Api.kt interface ApiSearvice { @GET("/") fun fetchDeferrd(@Query("zipcode") zipCode: String = "1000000"): Deferred } val service = retrofit.create(ApiSearvice::class.java) suspend fun fetch(): Response { return service.fetchDeferrd().await() } TVTQFOEًاحس׾⢪ֲהծ BXBJU ׾剅ַ׆חず劍涸ח《䖤׃גְ׷״ֲח剅ֽ׷ ,PUMJOךط؎ذ؍ـזأة؎ٕכֿך剅ֹ倯 ˖ IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJODPSPVUJOFTJOGPSNBMNEBTZODISPOPVTQSPHSBNNJOHTUZMFT

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launch(UI) { val response = api.fetch() Snackbar.make(view, "code:${response.code}", Snackbar.LENGTH_LONG) .setAction("Action", null).show() } Api.kt interface ApiSearvice { @GET("/") fun fetchDeferrd(@Query("zipcode") zipCode: String = "1000000"): Deferred } val service = retrofit.create(ApiSearvice::class.java) suspend fun fetch(): Response { return service.fetchDeferrd().await() } TVTQFOEًاحس׾⢪ֲ׋׭ח׻ׂ׻ׂٓحف׃גְ׷ ˖ IUUQTHJUIVCDPN,PUMJOLPUMJODPSPVUJOFTCMPCNBTUFSLPUMJODPSPVUJOFTJOGPSNBMNEBTZODISPOPVTQSPHSBNNJOHTUZMFT

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׌ְ׋ְ椚鍑דֹ׋

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תה׭ ˖ $PSPVUJFOTכ5ISFBE♳ד⹛ֻծ⹛ֹכ然钠דֹ׷ ˖ ⚥倖ָדֹגⱄꟚָדֹ׷ ˖ TVTQFOE׾⢪׏׋剅ֹ倯ד剅ְגְֻ