Androidと非同期処理 とCoroutine1.0.0

- Kotlin1.3とCoroutine1.0.0とJetpack
- なぜAndroidでコルーチンを使いたいか
- Androidでコルーチンを使う準備
- 並行処理を書く(直列、並列、スコープと例外)
- おまけ1: Rx with Coroutine
- おまけ2: Jetpack with Coroutine

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17. ©2018 Lang-8 Inc. ALL Rights Reserved. ͳͥίϧʔνϯΛ࢖͍͍͔ͨ
18. ©2018 Lang-8 Inc. ALL Rights Reserved. ͳͥίϧʔνϯΛ࢖͍͍͔ͨ wݶΒΕͨϦιʔεͰεέʔϧͰ͖Δ
19. ©2018 Lang-8 Inc. ALL Rights Reserved. εϨουͷ࣮ߦΠϝʔδ 5ISFBE1PPM 8PSLFS 8PSLFS 8PSLFS 8PSLFS εϨου .#d.#΄ ͲϝϞϦΛ࢖͏
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21. ©2018 Lang-8 Inc. ALL Rights Reserved. ͳͥίϧʔνϯΛ࢖͍͍͔ͨ wݶΒΕͨϦιʔεͰεέʔϧͰ͖Δ
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23. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int, f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } }
24. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int, f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } "1*ʹϦΫΤετͯ݁͠ՌΛฦؔ͢਺
25. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int, f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ׬ྃ࣌ͷίʔϧόοΫΛҾ਺ʹऔΔ
26. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int, f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ίʔϧόοΫʹଓ͖ͷॲཧΛॻ͘
27. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int, f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ίʔϧόοΫʹଓ͖ͷॲཧΛॻ͘ ܧଓঢ়گΛ࣋ͭϓϩάϥϜ
28. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜΛ༰қʹهड़͢Δ suspend fun getProfile(id: Int): Profile suspend fun loadProfile(id: Int) { val profile = getProfile(token) showProfile(profile) }
29. ©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜΛ༰қʹهड़͢Δ suspend fun getProfile(id: Int): Profile suspend fun loadProfile(id: Int) { val profile = getProfile(token) showProfile(profile) } ϫʔΧʔεϨουͰಈ࡞ 6*εϨουͰಈ࡞
30. ©2018 Lang-8 Inc. ALL Rights Reserved. ͳͥίϧʔνϯΛ࢖͍͍͔ͨ wݶΒΕͨϦιʔεͰεέʔϧͰ͖Δ
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31. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯ͸ϥΠϒϥϦͰఏڙ͞Ε͍ͯΔ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFT
32. ©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' }
33. ©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
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35. ©2018 Lang-8 Inc. ALL Rights Reserved. "OESPJEͰίϧʔνϯΛ࢖͏४උ
36. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ༻ҙ͢Δ
37. ©2018 Lang-8 Inc. ALL Rights Reserved. w$PSPVUJOF4DPQF͸ίϧʔνϯͷ࣮ߦ؀ڥ $PSPVUJOF4DPQFΛ༻ҙ͢Δ
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41. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job
42. ©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 }
43. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job
44. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job
45. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job ࣮ߦ؀ڥΛઃఆ͢Δ
46. ©2018 Lang-8 Inc. ALL Rights Reserved. %JTQBUDIFS͸࣮ߦ؀ڥΛ࢘Δ wίϧʔνϯΛ࣮ߦ͢ΔεϨου΍࣮ߦεέδϡʔ ϧΛ؅ཧ͢Δ
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50. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job
51. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job ࢠίϧʔνϯͷϋϯυϥ
52. ©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++}") } } }
53. ©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
54. ©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
55. ©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++}") } } }
56. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ override fun onPause() { job.cancelChildren() super.onPause() }
57. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ override fun onPause() { job.cancelChildren() super.onPause() } ࢠίϧʔνϯΛ͢΂ͯ
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58. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ override fun onPause() { job.cancelChildren() super.onPause() }
59. ©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity : AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch {/*…*/} } override fun onPause() { job.cancelChildren() super.onPause() } }
60. ©2018 Lang-8 Inc. ALL Rights Reserved. 7JFX.PEFMͱ$PSPVUJOF4DPQF WJFXNPEFMLUY
    
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62. ©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦॲཧΛॻ͘
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63. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯϏϧμʔͱ TVTQFOEؔ਺
64. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯϏϧμʔͱ͸ wίϧʔνϯΛ։࢝͢Δؔ਺
65. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯϏϧμʔͱ͸ wίϧʔνϯΛ։࢝͢Δؔ਺
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66. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯϏϧμʔͱ͸ wίϧʔνϯΛ։࢝͢Δؔ਺
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67. ©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯϏϧμʔͱ͸ wίϧʔνϯΛ։࢝͢Δؔ਺
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68. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ͸ wεϨουΛϒϩοΩϯά͢Δ͜ͱͳ͘ॲཧΛఀ ࢭͰ͖Δؔ਺
69. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ͸ wεϨουΛϒϩοΩϯά͢Δ͜ͱͳ͘ॲཧΛఀ ࢭͰ͖Δؔ਺
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70. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ͸ wεϨουΛϒϩοΩϯά͢Δ͜ͱͳ͘ॲཧΛఀ ࢭͰ͖Δؔ਺
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71. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ͸ wεϨουΛϒϩοΩϯά͢Δ͜ͱͳ͘ॲཧΛఀ ࢭͰ͖Δؔ਺
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    wίϧʔνϯϏϧμʔʹΘͨ͢ϥϜμࣜ͸ TVTQFOEϥϜμʹͳ͍ͬͯΔɻ
72. ©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) } } }
73. ©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਺
74. ©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਺
75. ©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
76. ©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) } } } "1*ϦΫΤετɻϒϩοΩϯά͢Δॲཧ
77. ©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) } } } ίϧʔνϯΛىಈ
    %JTQBUDIFST.BJO
    
    KPCͱ͢Δ
78. ©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) } } }
79. ©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
80. ©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࡞
81. ©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࠶։ͯ͠୅ೖ
82. ©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࡞
83. ©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
84. ©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 ྫ֎࣌͸ͬͪ͜
85. ©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 ͸ͬͪ͜
86. ©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) } } }
87. ©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) } } }
88. ©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) } } }
89. ©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ wXJUI$POUFYUؔ਺Λ࢖ͬͯίϧʔνϯͷ࣮ߦ ؀ڥΛ੾Γସ͑Δ
    w௚ྻͰ࣮ߦ͢Δ৔߹͸୯७ʹฒ΂Δ͚ͩͰྑ͍
    wΤϥʔͱΩϟϯηϧ͸USZDBUDIͰॲཧ͢Δ
    wඇಉظॲཧͷ΄ͱΜͲ͸͜ΕͰରԠͰ͖Δ͸ͣ
90. ©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) } } }
91. ©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) } } }
92. ©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) } } } DPSPVUJOF4DPQFؔ਺Λ࢖ͬͯ ࢠείʔϓΛ։࢝͢Δ
93. ©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) } } } BTZODؔ਺ͰίϧʔνϯΛෳ਺ىಈ͢Δ
94. ©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) } } } ଴ͪ߹ΘͤΔ
95. ©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) } } }
96. ©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) } } }
97. ©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑͷߏ଄Խ IUUQTNFEJVNDPN!FMJ[BSPWTUSVDUVSFEDPODVSSFODZEBB
98. ©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑͷߏ଄Խ IUUQTWPSQVTPSHCMPHOPUFTPOTUSVDUVSFEDPODVSSFODZPSHPTUBUFNFOUDPOTJEFSFEIBSNGVM
99. ©2018 Lang-8 Inc. ALL Rights Reserved. wߏ଄Խϓϩάϥϛϯάͷฒߦੑ൛
    wฒߦॲཧʹ͓͚ΔHPUPͷΑ͏ͳ ΋ͷΛͳٞ͘͢࿦
    w$PSPVUJOF4DPQF͸͜ͷٞ࿦ Λجʹಋೖ͞Εͨ ฒߦੑͷߏ଄Խͬͯʁ
100. ©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 } }
101. ©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 } } USZXJUISFTPVSDFTͰϑΝΠϧΛ։͘
102. ©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
103. ©2018 Lang-8 Inc. ALL Rights Reserved. wฒߦ෼ذͷ։࢝ͱऴྃΛͻͱ·ͱ·Γͷ୯Ґ ʹͯ͠ɺͦΕΒΛ֊૚ߏ଄ʹ͢Δ ฒߦੑʹ͓͚ΔHPUPΛ๷͙ΞΠσΞ ฒߦ෼ذͷ·ͱ·Γ
     
     
     
     
     
     $PSPVUJOF4DPQF
104. ©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑͷߏ଄ԽͷΠϝʔδ
105. ©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) } } }
106. ©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) } } } 1BSFOU
     4DPQF $IJME
     4DPQF MBVODI BTZOD BTZOD
107. ©2018 Lang-8 Inc. ALL Rights Reserved. είʔϓͱྫ֎ 1BSFOU
     4DPQF $IJME
     4DPQF MBVODI BTZOD BTZOD
108. ©2018 Lang-8 Inc. ALL Rights Reserved. είʔϓͱྫ֎ 1BSFOU
     4DPQF $IJME
     4DPQF MBVODI BTZOD BTZOD
109. ©2018 Lang-8 Inc. ALL Rights Reserved. είʔϓͱྫ֎ 1BSFOU
     4DPQF $IJME
     4DPQF MBVODI BTZOD BTZOD είʔϓ಺ͷฒߦ෼ذͷ͍ͣΕ͔͕ΤϥʔʹͳΔͱ
     είʔϓશମ͕Τϥʔ Ωϟϯηϧ ʹͳΔ
110. ©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
111. ©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) } } } ࢠείʔϓ͕ऴྃ͠ྫ֎͕ඈΜͰ͘Δ
112. ©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) } } }
113. ©2018 Lang-8 Inc. ALL Rights Reserved. 1BSFOU
     4DPQF MBVODI BTZOD BTZOD DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ
114. ©2018 Lang-8 Inc. ALL Rights Reserved. 1BSFOU
     4DPQF MBVODI BTZOD BTZOD DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ
115. ©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
116. ©2018 Lang-8 Inc. ALL Rights Reserved. 3Y
     XJUI
     $PSPVUJOF
117. ©2018 Lang-8 Inc. ALL Rights Reserved.
118. ©2018 Lang-8 Inc. ALL Rights Reserved.
119. ©2018 Lang-8 Inc. ALL Rights Reserved.
120. ©2018 Lang-8 Inc. ALL Rights Reserved.
121. ©2018 Lang-8 Inc. ALL Rights Reserved.
122. ©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWBͱͷ౷߹ wLPUMJOYDPSPVUJOFTSYΛ࢖͏
     w4JOHMF
     .BZCF
     $PNQMFUBCMFͳͲΛ TVTQFOEؔ਺ʹͰ͖Δ
     wTVTQFOEؔ਺Λ4JOHMF
     .BZCF
     $PNQMFUBCMFͳͲͰ͖Δ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTUSFFNBTUFSSFBDUJWFLPUMJOYDPSPVUJOFTSY
123. ©2018 Lang-8 Inc. ALL Rights Reserved. 4JOHMFΛTVTQFOEؔ਺ʹ͢Δ interface RemoteService { @GET("/profile") fun getProfile(id: Int): Single<Profile> }
124. ©2018 Lang-8 Inc. ALL Rights Reserved. 4JOHMFΛTVTQFOEؔ਺ʹ͢Δ interface RemoteService { @GET("/profile") fun getProfile(id: Int): Single<Profile> } val profile = withContext { service.getProfile(id).await() } 4JOHMFͷ֦ுؔ਺ʹ
     BXBJU ͕௥Ճ͞Ε͍ͯΔ
125. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺Λ4JOHMFʹ͢Δ fun getProfile(id: Int): Single<Profile> { return rxSingle { Profile(id) } } TVTQFOEϥϜμΛड͚औͬͯ݁ՌΛ 4JOHMFͰฦؔ͢਺
126. ©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺Λ4JOHMFʹ͢Δ fun getProfile(id: Int): Single<Profile> { return rxSingle { Profile(id) } } TVTQFOEϥϜμΛड͚औͬͯ݁ՌΛ 4JOHMFͰฦؔ͢਺ Τϥʔʹͳͬͯ΋਌είʔϓΛ
     Ωϟϯηϧ͠ͳ͍
127. ©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWB
     XJUI
     $PSPVUJPOF w LPUMJOYDPSPVUJOFTSYͰ૬ޓͷΠϯςάϨʔγϣ ϯ͕Մೳ
     w ྫ͑͹ෳࡶʹ߹੒͕ඞཁͳՕॴͳͲ͸ίϧʔνϯͰϑϥο τʹॻ͍ͯ࠷ޙʹ4JOHMFʹ͢Δͱ͔͕͍͍͔΋
     w ରཱ͢Δ΋ͷͰ͸ͳ͍ͷͰ͍͍ײ͡ʹ࢖͏ͷ͕ྑ͍ ͓͢ ͢Ί͸4JOHMF
     .BZCF
     $PNQMFUBCMFͷஔ͖׵͑
128. ©2018 Lang-8 Inc. ALL Rights Reserved. +FUQBDL
     XJUI
     $PSPVUJOF
129. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱίϧʔνϯ wBMQIBͰ$PSPVUJOF8PSLFSΛ௥Ճ
130. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } }
131. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } EP8PSLؔ਺͕TVTQFOEؔ਺ʹͳΔ
132. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ΦʔόʔϥΠυͰ͖Δɻ
     σϑΥϧτ͸%JTQBUDIFST%FGBVMU
133. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$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
134. ©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context, param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ໭Γ஋͕8PSLFSͱ͸ҟͳΔɻ
     PVUQVU%BUBΛ໌ࣔతʹ౉͢ඞཁ͕͋Δ public Payload(@NonNull Result result, @NonNull Data output) { mResult = result; mOutput = output; }
135. ©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱίϧʔνϯ w BMQIBͰ%"0ͰTVTQFOEؔ਺Λαϙʔτ
136. ©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ @Dao interface UserDao { @Insert suspend fun insert(user: User) @Update suspend fun update(user: User) @Query("SELECT * FROM user") suspend fun getAllUsers(): List<User> @Delete suspend fun delete(user: User) }
137. ©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ val job = Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } }
138. ©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ val job = Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } } ಺෦ͰXJUI$POUFYUؔ਺͕ݺͼग़͞ΕΔ
139. ©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 } } ಺෦ͰXJUI$POUFYUؔ਺͕ݺͼग़͞ΕΔ 3PPNͷ2VFSZ&YFDVUPSΛ %JTQBUDIFSʹ͍ͯ͠Δ
140. ©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()
141. ©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() 3PPN#VJMEFSͰ&YFDVUPSΛઃఆͰ͖Δ
142. ©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
143. ©2018 Lang-8 Inc. ALL Rights Reserved. ©2018 Lang-8 Inc. ALL Rights Reserved. ͋Γ͕ͱ͏͍͟͝·ͨ͠