Kotlin의 코루틴은 어떻게 동작하는가
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The document discusses Kotlin coroutines and asynchronous programming. It demonstrates how to write asynchronous code using coroutines and covers topics like launching coroutines with different dispatchers, cancelling coroutines, and handling timeouts. Key functions and concepts discussed include launch, delay, runBlocking, withTimeout, and coroutine contexts/dispatchers.
![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")](https://image.slidesharecdn.com/heykotlinhowcoroutineworks-180423005634/85/Kotlin-65-320.jpg)
Kotlin의 코루틴은 어떻게 동작하는가
- 33. fun fetchUserDetail(id: String) { val token = auth() val user = getUser(token, id) updateUserData(user) } Waaaaa~~it 😵 😵
- 34. fun fetchUserDetail(id: String) { auth { token -> getUser(token) { updateUserData(it) } } }
- 35. suspend fun fetchUserDetail(id: String) { val token = auth() val user = getUser(token, id) updateUserData(user) } suspend
- 38. fun plusOne(initial: Int) : Int { val ONE = 1 var result = initial result += ONE return result }
- 48. public interface Continuation<in T> { } public val context: CoroutineContext public fun resume(value: T) public fun resumeWithException(exception: Throwable)
- 49. suspend fun fetchUserDetail(id: String) { val token = auth() val user = getUser(token, id) updateUserData(user) } }
- 50. suspend fun fetchUserDetail(id: String) { // ... switch (label) { case 0: val token = auth() case 1: val user = getUser(token, id) case 2: updateUserData(user) } }
- 51. fun fetchUserDetail(id: String) { // ... switch (label) { case 0: val token = auth() case 1: val user = getUser(token, id) case 2: updateUserData(user) } }
- 52. 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
- 53. 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: … } }
- 54. fun fetchUserDetail(id: String, cont: Contiunation) { val sm = object : CoroutineImpl { ... } switch (sm.label) { case 0: sm.id = id sm.label = 1 auth(sm) … } }
- 55. fun fetchUserDetail(id: String, cont: Contiunation) { val sm = object : CoroutineImpl { ... } switch (sm.label) { … case 1: val id = sm.id val token = sm.result as String sm.label = 2 getUser(token, id, sm) … }
- 56. fun fetchUserDetail(id: String, cont: Contiunation) { val sm = object : CoroutineImpl { fun resume(...) { fetchUserDetail(null, this) } } switch (sm.label) { case 0: … } }
- 57. fun fetchUserDetail(id: String, cont: Contiunation) { val sm = cont as? ThisSM ?: object : CoroutineImpl { fun resume(...) { fetchUserDetail(null, this) } } switch (sm.label) { case 0: … } }
- 60. public interface Continuation<in T> { } public val context: CoroutineContext public fun resume(value: T) public fun resumeWithException(exception: Throwable)
- 62. fun updateUserDetail(id: String) = launch(UI) { val token = auth() val user = getUser(token, id) updateUserDataOntoUI(user) }
- 64. class DispatchedContinuation<in T> ( val dispatcher: CoroutineDispatcher, val continuation: Continuation<T> ) : Continuation<T> by continuation { override fun resume(value: T) { dispatcher.dispatch(context, DispatchTask(...)) } ... }
- 65. 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")
- 66. 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() } }
- 69. 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 ...
- 70. 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.
- 71. 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 …