Androidと非同期処理とCoroutine1.0.0

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©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯ͸ϥΠϒϥϦͰఏڙ͞Ε͍ͯΔ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFT dependencies { implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1' implementation ‘org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.0.1' }

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©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯ͸ϥΠϒϥϦͰఏڙ͞Ε͍ͯΔ dependencies { implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1' implementation ‘org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.0.1' } wKBS,# wBQL,# wPQUJNJ[F࠷খ,#

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job public interface CoroutineScope { public val coroutineContext: CoroutineContext }

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©2018 Lang-8 Inc. ALL Rights Reserved. %JTQBUDIFST*0 w*0ʹ࠷దԽͨ͠εϨουϓʔϧ w࠷௿ฒߦ w%FGBVMUͱεϨουϓʔϧͱڞ༗͍ͯ͠ ΔͷͰߴ଎ Β͍͠ˣ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFSDPSFLPUMJOYDPSPVUJOFTDPSFTSDTDIFEVMJOH$PSPVUJOF4DIFEVMFSLU

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } } ίϧʔνϯΛىಈ

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } } NTఀࢭͯ͠࠶։͢Δ

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch {/*…*/} } override fun onPause() { job.cancelChildren() super.onPause() } }

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ͜͜ͰॲཧΛதஅ͠ɺ࠶։࣌ʹ1SPpMFΛฦؔ͢਺

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ίϧʔνϯͷ࣮ߦ؀ڥΛ੾Γସ͑ΔTVTVQFOEؔ਺ ͜͜Ͱ͸ϫʔΧʔεϨουͰಈ͘ઃఆΛ͍ͯ͠Δ

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө ྫ֎࣌͸ͬͪ͜

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©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө ྫ֎࣌͸ͬͪ͜ Ωϟϯηϧ είʔϓ͕ऴྃͨ͠ ͸ͬͪ͜

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©2018 Lang-8 Inc. ALL Rights Reserved. ௚ྻʹॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) { requestTicketCount(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) val ticketCount = getTicketCount(id) view.showProfile(profile, ticketCount) } catch (e: Exception) { view.showError(e) } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. ฒྻʹॻ͘ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ suspend fun getProfile(id: Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { val profile = async { getProfile(id) } val tickets = async { getTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } catch (e: Exception) { view.showError(e) } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑʹ͓͚ΔHPUP void save(int data, File file) { try (FileOutputStream out = new FileOutputStream(file);) { new Thread() { @Override public void run() { try { out.write(data); } catch (IOException e) { // error } } }.start(); } catch (IOException e) { // error } }

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©2018 Lang-8 Inc. ALL Rights Reserved. void save(int data, File file) { try (FileOutputStream out = new FileOutputStream(file);) { new Thread() { @Override public void run() { try { out.write(data); } catch (IOException e) { // error } } }.start(); } catch (IOException e) { // error } } ฒߦੑʹ͓͚ΔHPUP USZXJUISFTPVSDFTͷதͰεϨου Λىಈͯ͠PVUʹ৮ͬͯ΋ඞͣDMPTFࡁ ΈͳͷͰΤϥʔʹͳΔ

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©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑΛߏ଄Խ͢Δ fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺ fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } UISPX&YDFQUJPO

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©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ fun showProfile(id: Int) { launch { try { val profile = async { requestProfile(id) } val tickets = async { requestTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } catch (e: Exception) { view.showError(e) } } }

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©2018 Lang-8 Inc. ALL Rights Reserved. ฒྻॲཧΛॻ͘ wίϧʔνϯͷதͰίϧʔνϯ ෼ذ Λىಈ͢Δ৔ ߹͸DPSPVUJOF4DPQFؔ਺Λ࢖͏ είʔϓͷ ֊૚ߏ଄Λߟ͑Δ wMBVODIBTZODΛωετͯ͠Δ࣌͸஫ҙ w෼ذ͕Τϥʔʹͳͬͯ΋είʔϓΛܧଓͰ͖Δ TVQFSWJTPS4DPQFؔ਺͕͋Δ ࠓճ͸লུ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTTVQFSWJTPSTDPQFIUNM

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©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWBͱͷ౷߹ wLPUMJOYDPSPVUJOFTSYΛ࢖͏ w4JOHMF .BZCF $PNQMFUBCMFͳͲΛ TVTQFOEؔ਺ʹͰ͖Δ wTVTQFOEؔ਺Λ4JOHMF .BZCF $PNQMFUBCMFͳͲͰ͖Δ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTUSFFNBTUFSSFBDUJWFLPUMJOYDPSPVUJOFTSY

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©2018 Lang-8 Inc. ALL Rights Reserved. 4JOHMFΛTVTQFOEؔ਺ʹ͢Δ interface RemoteService { @GET("/profile") fun getProfile(id: Int): Single } val profile = withContext { service.getProfile(id).await() } 4JOHMFͷ֦ுؔ਺ʹ BXBJU ͕௥Ճ͞Ε͍ͯΔ

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©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWBXJUI$PSPVUJPOF w LPUMJOYDPSPVUJOFTSYͰ૬ޓͷΠϯςάϨʔγϣ ϯ͕Մೳ w ྫ͑͹ෳࡶʹ߹੒͕ඞཁͳՕॴͳͲ͸ίϧʔνϯͰϑϥο τʹॻ͍ͯ࠷ޙʹ4JOHMFʹ͢Δͱ͔͕͍͍͔΋ w ରཱ͢Δ΋ͷͰ͸ͳ͍ͷͰ͍͍ײ͡ʹ࢖͏ͷ͕ྑ͍ ͓͢ ͢Ί͸4JOHMF .BZCF $PNQMFUBCMFͷஔ͖׵͑

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©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ΦʔόʔϥΠυͰ͖Δɻ σϑΥϧτ͸%JTQBUDIFST%FGBVMU

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©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ໭Γ஋͕8PSLFSͱ͸ҟͳΔɻ PVUQVU%BUBΛ໌ࣔతʹ౉͢ඞཁ͕͋Δ

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©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ໭Γ஋͕8PSLFSͱ͸ҟͳΔɻ PVUQVU%BUBΛ໌ࣔతʹ౉͢ඞཁ͕͋Δ public Payload(@NonNull Result result, @NonNull Data output) { mResult = result; mOutput = output; }

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©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ @Dao interface UserDao { @Insert suspend fun insert(user: User) @Update suspend fun update(user: User) @Query("SELECT * FROM user") suspend fun getAllUsers(): List @Delete suspend fun delete(user: User) }

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©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ val job = Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } }

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©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ2VFSZ&YFDVUPS val db = Room.databaseBuilder( applicationContext, AppDatabase::class.java, "database-name" ).apply { val dispatcher = Dispatchers.IO if (dispatcher is ExecutorCoroutineDispatcher) { setQueryExecutor(dispatcher.executor) } }.build()

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©2018 Lang-8 Inc. ALL Rights Reserved. ·ͱΊ w ίϧʔνϯ͸লϝϞϦɺॻ͖΍͍͢ ಡΈ΍͍͢ ɺϥΠϒϥϦͱ ͯ͠΋ܰྔ w $PSPVUJOF4DPQFͱϥΠϑαΠΫϧΛ࣋ͭίϯϙʔωϯτΛ૊ Έ߹Θͤͯ࢖͏ w ୯७ͳඇಉظॲཧ͸XJUI$POUFYUؔ਺Ͱେ఍͸ΧόʔͰ͖Δ w ฒྻͰίϧʔνϯΛىಈ͢Δ৔߹͸είʔϓͷ֊૚Λҙࣝ͢Δඞ ཁ͕͋Δɻ w 3Yͱ͸ରཱ͠ͳ͍ɻҰ෦ͷॲཧ͕ஔ͖׵͕͑Ͱ͖Δ͔΋ w +FUQBDLͰ΋ଓʑαϙʔτ͕ਐΜͰಋೖ͠΍͘͢ͳ͖͍ͬͯͯΔ

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