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kanmoba-returns-02.pdf
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Takuji Nishibayashi
June 12, 2019
Technology
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kanmoba-returns-02.pdf
Takuji Nishibayashi
June 12, 2019
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Transcript
5ͰΘ͔ͬͨؾʹͳΔKotlin Corou,nes @takuji31 ؼ͖ͬͯͨؔϞόΠϧΞϓϦݚڀձ #2
ࣗݾհ
ࣗݾհ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co.,
Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ
ࣗݾհ • Android • Kotlin • Flu-er • ! h-ps:/
/blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp
Kotlin Corou+nes
ͬͯ·͔͢ʁ
ίϧʔνϯʢӳ: co-rou(neʣͱϓϩάϥ ϛϯάͷߏͷҰछɻαϒϧʔνϯ͕Τϯτ Ϧʔ͔ΒϦλʔϯ·ͰΛҰͭͷॲཧ୯Ґͱ͢ Δͷʹର͠ɺίϧʔνϯ͍ͬͨΜॲཧΛ தஅͨ͠ޙɺଓ͖͔ΒॲཧΛ࠶։Ͱ͖Δɻ — h$ps://ja.wikipedia.org/wiki/ %E3%82%B3%E3%83%AB%E3%83%BC%E3%83%81%E3%83%B3
Corou%neʹ͍͓ͭͯ͞Β͍͠· ͠ΐ͏
suspended func*on
தஅՄೳͳؔ
suspend function fetchUser() : User { val user = //
ωοτϫʔΫ௨৴ͳͲͷॏ͍ॲཧ return user }
Corou%neContext
Corou%neͷίϯςΩετ
ෳͷElementΛΈ߹Θͤͯ࡞Δ
Job
Dispatcher
Name
Excep&onHandler
ωετՄೳ
val context = Job() + Dispatchers.Main launch(context) { // run
in main thread delay(100) val response = withContext(Dispatchers.Default) { // run in background thread networkAccess() } }
Corou%neScope
Corou%neͷείʔϓ
ContextΛ࣋ͭ
ωετՄೳ
async/launchͰ্ཱͪ͛ͨίϧʔν ϯͰྫ֎͕ى͖Δͱείʔϓશମ ͕ࢮ͵ͷͰҙ
Ϋϥογϡ͢Δͭ // ྫ֎Ͱείʔϓશମ͕ࢮΜͰΫϥογϡ͢Δ coroutineScope { try { val user =
async { fetchUser() } val series = async { fetchSeries("12345") } doSomething(user.await(), series.await()) } catch (e: IOException) { // catch͞Εͳ͍ } }
ରࡦ coroutineScope { try { // Nested scope val (user,
series) = coroutineScope { val user = async { fetchUser() } val series = async { fetchSeries("12345") } Pair(user, series) } doSomething(user.await(), series.await()) } catch (e: IOException) { // show error } }
Deferred
ϊϯϒϩοΩϯάͳFuture
val user = async { fetchUser() } // Deferred<User> val
series = async { fetchSeries("12345") } // Deferred<Series> doSomething(user.await(), series.await())
Channel
ϗοτͳετϦʔϜ
val channel = Channel<User>(Channel.CONFLATED) userObserver.addOnChangeListener { user -> launch {
channel.send(user) } } channel.consumeEach { user -> doSomething(user) }
Flow
ίʔϧυͳετϦʔϜ
Preview status
1.3.0-M1ͰExperimentalʹ
val userFlow = flow<User> { emit(observeUser()) } val seriesFlow =
flow<Series> { emit(observeSeries()) } userFlow.combineLatest(seriesFlow) { user, series -> createItemModels(user, series) }.collect { itemModels -> // show items }
Enjoy Kotlin Corou.nes life!