Swift Concurrencyの尻尾を掴め～並行処理を受け入れる取っ掛かり

ೳొཁ !OPUPSPJE J1IPOFΞϓϦ։ൃऀ೥݄೔ 4XJGU$PODVSSFODZͷ ৲ඌΛ௫Ί ʙฒߦॲཧΛड͚ೖΕΔऔֻ͔ͬΓ

࿩͢಺༰ w 4XJGU$PODVSSFODZͷେ࿮ w 4XJGU$PODVSSFODZͷऔֻ͔ͬΓΛ௫ΉͨΊͷଊ͑ํͭ

࿩͞ͳ͍಺༰ w BDUPSͷৄࡉ w !.BJO"DUPS w !HMPCBM"DUPS w ߏ଄Խ͞Εͨฒߦੑ BDUPS·Ͱ࿩͢ʹ͸
BDUPS͸ॏཁ͕ͩ ͕࣌ؒ଍Γͳ͍ʜ

͓୊໨ w ظ଴ͱͨΊଉͷ4XJGU$PODVSSFODZ w ؆ܿʹ4XJGU$PODVSSFODZͷઆ໌ w ֆͰऔֻ͔ͬΓΛ͔ͭΉ w ୹͍จࣈྻͰࣔͯ͠ΈΔ w
̐֊૚Ͱࣔͯ͠ΈΔ w ·ͱΊ

ຊ୊ʹೖΔલʹ

BlogͰ2020೥ʹ౤ߘͨ͠಺༰

"QQMFϚϧνϓϥοτϑ ΥʔϜ .VMUJQMBUGPSN ରԠ͸ෳ਺ͷJOGPQMJTU ΁ͷରԠͰ΋͋Δ࿩ J04 J1BE04 NBD04 IUUQTJSJNBTVDPN
BQQMFNVMUJQMBUGPSNJOGP QMJTUJPTJQBEPTNBDPT

w ೥౰࣌ɺNVMUJQMBUGPSNΛᨳ͍ͳ͕ΒJOGPQMJTU͚͕ͩऔΓ࢒͞Ε͍ͯΔ ఺Λࢦఠ w 9DPEFҎ߱Ͱ͸JOGPQMJTUͷ֤छ߲໨͸ϓϩδΣΫτઃఆ͔Β(FOFSBUF͞ ΕΔΑ͏ʹͳ͍ͬͯΔ

JOGPQMJTU w ೥౰࣌ɺNVMUJQMBUGPSNΛᨳ͍ͳ͕ΒJOGPQMJTU͚͕ͩऔΓ࢒͞Ε͍ͯΔ ఺Λࢦఠ w 9DPEFҎ߱Ͱ͸JOGPQMJTUͷ֤छ߲໨͸ϓϩδΣΫτઃఆ͔Β(FOFSBUF͞ ΕΔΑ͏ʹͳ͍ͬͯΔ

࣮࣭"QQMF։ൃ؀ڥͷมԽΛ ༧૝͍ͯ͠Δ

͓ͦΒ͘4XJGU6*Ͱ8FCΞϓϦΛ ࡞੒Ͱ͖Δ೔΋͍ۙ͸ͣ

ؓ࿩ٳ୊

ظ଴ͱͨΊଉͷ4XJGU $PODVSSFODZ

ظ଴ͱͨΊଉͷ4XJGU$PODVSSFODZ w 4XJGU͕ൃද͞Εͯ೥ 88%$ʙ w "QQMF͕৽ݴޠΛಋೖͨ͠໨࿦ݟ͸ॾʑ w େ੎ྗͱͳͬͨ8FC։ൃऀΛऔΓࠐΈ͍ͨͱ͍͏ҙਤ͸͋Δ

େ͖͍։ൃऀूஂ͔ΒΞϓϦ։ൃऀΛҾ͖د͍ͤͨ "OESPJE͕+BWBݴޠΛཧղͰ͖ΔϓϩάϥϚʔऔΓࠐΜͰେ͖͘ͳͬͨྺ࢙Λ࠶ݱ͍ͨ͠

4XJGU͕ औΓࠐΈ͍ͨ࠷ۙͷ &$."4DSJQU

&$."4DSJQU ೥୆ޙ൒ʙ೥୆લ൒ αʔόʔαΠυͰ/PEF+4࠾༻ྫ͕૿͔͑ͯΒٕज़తվળ͕Ճ଎ ॱෆಉ /PEF+4%FOP ύοέʔδ؅ཧ #BCFM
ԼҐޓ׵ੑΛҡ࣋͢Δτϥϯείʔμʔ ؆ܿͳهड़ Ξϩʔؔ਺ࣜ ͷ௥Ճ #BCFMʹΑΔԼҐޓ׵อͪͭͭಋೖ &4-JOU ੩తߏจղੳ͕࣮࣭ͩϏϧυॲཧͷҰ෦ QSPNJTF BTZODBXBJUಉظॲཧ BTZODBXBJU ؆ܿͳಉظॲཧهड़

8FC"TTFNCMZ ϑϩϯτΤϯυͰ͸ॲཧͷߴ଎ԽΛ໨ࢦͨ͠WebԾ૝Ϛγϯͱͦͷ্Ͱಈ࡞͢ΔόΠφϦʔ͕ొ৔ɻ

BTZODBXBJU͕&$."4DSJQU্Ͱ࣮ ݱ͞ΕͨࣄͰBTZODBXBJU͕ҰൠԽ

4XJGU΋4XJGU$PODVSSFODZʹؚΊΔܗͰ BZODBXBJUهड़Λಋೖ

؆ܿʹ4XJGU$PODVSSFODZͷه๏

Swift Concurrencyͷ؆ܿͳهड़ʹ(࠷ॳ͸)جͮ͘ɻiOS15 SDKͰಋೖ͞ΕͨURLSessionͷSwift Concurrency޲͚ͷϢʔςΟϦςΟϝιουΛ༻͍Δɻ let (data, response) = await URLSession.shared.data(for:
ϦΫΤετ)

ϦΫΤετ) ͨͩ͠ɺECMAScriptͱ͸ҟͳΓɻtry/throw ػߏ͕ߟྀ͞Ε͍ͯΔඞཁ͕͋Δɻ let (data, response) = try await URLSession.shared.data(for: ϦΫΤετ)

ϦΫΤετ) ͨͩ͠ɺECMAScriptͱ͸ҟͳΓɻtry/throw ػߏ͕ߟྀ͞Ε͍ͯΔඞཁ͕͋Δɻ let (data, response) = try await URLSession.shared.data(for: ϦΫΤετ) ͨͩ͠ɺTaskͰғΉ(΋͘͠͸TaskΛ಺แͨ͠ϝιουex: SwiftUI ͷtask) Λ௥Ճ͢Δඞཁ͕͋Δɻ Task { let (data, response) = try await URLSession.shared.data(for: ϦΫΤετ) }

struct RandomFox: Equatable, Codable { let image: String; let link:
String} Task { let url = URL(string: "https://randomfox.ca/floof/")! let request = URLRequest(url: URL(string: "https://randomfox.ca/ floof")!, cachePolicy: .reloadIgnoringLocalCacheData) do { let (data, response) = try await URLSession.shared.data(for: request) _ = response as! HTTPURLResponse let randomFox = try JSONDecoder().decode(RandomFox.self, from: data) } catch error { print("error=\(error.localizedDescription)") } }

λεΫͬͯԿ

ฏߦॲཧͷྲྀΕΛҰखʹ Ҿ͖ड͚Δͷ͕5BTL

ݹయతฏߦॲཧ ϝΠϯεϨου଴ͪεϨουϫʔΧʔεϨου ϫʔΧʔεϨου ଴ͪεϨου ϝΠϯεϨου Ωϟϯηϧ΋Ͱ͖Δ ࡞ۀ୲౰εϨου ࡞ۀΛ؂ࢹ͢Δ ݁ՌΛฦ͢ ݁ՌΛฦ͢

ݹయతฏߦॲཧ ϝΠϯεϨου଴ͪεϨουϫʔΧʔεϨου ϫʔΧʔεϨου ଴ͪεϨου ϝΠϯεϨου Ωϟϯηϧ΋Ͱ͖Δ ࡞ۀ୲౰εϨου ࡞ۀΛ؂ࢹ͢Δ ݁ՌΛฦ͢ ݁ՌΛฦ͢
5BTL 5BTL͕ड͚࣋ͭ 5BTL͕ड͚࣋ͭ 5BTL͕ड͚࣋ͭ

๬Μͩ͸͕ͣͩͬͨ

BTZODBXBJUBDUPS5BTL!.BJO"DUPS !HMPCBM"DUPS!4FOEBCMF!VODIFDLFE 5BTLEFUBDIFEXJUI$IFDLFE$POUJOVBUJPO XJUI$IFDLFE5ISPXJOH$POUJOVBUJPO XJUI6OTBGF$POUJOVBUJPO XJUI6OTBGF5ISPXJOH$POUJOVBUJPOXJUI5BT XJUI5ISPXJOH5BTL(SPVQ5BTLJT$BODFMMFE $BODFMMBUJPO&SSPSXJUI5BTL$BODFMMBUJPO)B ಘΒΕͨͷ͸େྔͷΩʔϫʔυ

͕࣌ؒܦա͠ ެࣜҎ֎ͷυΩϡϝϯτ͕ॆ࣮த

ެࣜҎ֎ͷυΩϡϝϯτ ެ։͞Εͯ೥ܦա͠Α͏ͱ͢Δதɺ༏लͳެࣜҎ֎ͷυΩϡϝϯτ͕ొ৔ w 4XJGU$PODVSSFODZ·ͱΊʢਖ਼ࣜ൛ରԠࡁʣ w IUUQT[FOOEFWBLLZJFBSUJDMFTTXJGUDPODVSSFODZ w 4XJGU$PODVSSFODZνʔτγʔτ w IUUQT[FOOEFWLPIFSBSUJDMFTTXJGUDPODVSSFODZDIFBUTIFFU
w 4XJGU$PODVSSFODZͷXJUI5BTL$BODFMMBUJPO)BOEMFSͱ4FOEBCMFDPDLTDPNCMPH w IUUQTDPDLTDPNCIBUFOBCMPHDPNFOUSZ w .PEFSO$PODVSSFODZJO4XJGU*OUSPEVDUJPOw"OEZ*CBOF[ w IUUQTXXXBOEZJCBOF[DPNQPTUTNPEFSODPODVSSFODZJOTXJGUJOUSPEVDUJPO

ͦΕͰ΋औΓ૊Ήʹ͸ Կ͔͠Βͷऔֻ͔ͬΓ͕ඞཁ

4XJGU$PODVSSFODZͷ ෳࡶ͔͞Βଊ͑ͯΈΔ

୹͍จࣈྻͰࣔͯ͠ΈΔ

B5X T BZODBXBJUBDUPS 5BTL 8JUIʙͳͲେྔͷϝιου܈

B5X T BZODBXBJUBDUPS 5BTL XJUIʙͳͲେྔͷϝιου܈ 4XJGU༧໿ޠ ࣮͸ػೳͷࠜװ ෳࡶͳػೳ܈ γϯϓϧͰ੔ཧ͞Εͨهड़ ৑௕Ͱෳࡶ
࢖͍͜ͳ͢ʹ͸ඞཁ 5BTLͷதͰ͔͠ػೳ͠ͳ͍

Կނ͜͜·Ͱෳࡶ

"QQMFͱͯ͠͸ ͋ΒΏΔେن໛ͳ࢓૊Έ·Ͱద༻͍ͨ͠

େن໛ͱ͸ྫ͑͹

$PSF$16

ڧྗͳ$16ͷύϫʔΛϑϧՔಇ ͤ͞Δͷ͸"QQMFͷࢸ্໋୊

"QQMFۘ੡Ͱͳ͚Ε͹ಋೖΛ᪳᪯͢Δ ن໛ͷπʔϧΩοτ܈ͱԽ͍ͯ͠Δ

̐֊૚Ͱࣔͯ͠ΈΔ

BZODBXBJUΛؾܰ ʹݺͼग़ͤΔ֊૚ "ZODBXBJUΛ࢖ͬ ͯػೳ௥Ճ͢Δ֊૚ J04Ҏ্ J04Ҏ্ BTZODBXBJU 5BTL BDUPS ͦͷଞ4XJGU
$PODVSSFODZػೳ w 4XJGU w 4XJGU"UUSJCVUFT w (SBOE$FOUSBM%JTQBUDI w ڧྗͳϓϩηοαʔͷྗΛҾ͖ग़͢ w ෆ۩߹ͷೖΓࠐΈͮΒ͍ฏߦॲཧ લఏͱͳΔٕज़ "QQMFͷҙਤ

BZODBXBJUΛؾܰ ʹݺͼग़ͤΔ "ZODBXBJUΛ࢖ͬͯ ػೳ௥Ճ͢Δʹ͸ඞཁ J04Ҏ্ J04Ҏ্ BTZODBXBJU 5BTL BDUPS ͦͷଞ4XJGU
$PODVSSFODZػೳ w 4XJGU w 4XJGU"UUSJCVUFT w (SBOE$FOUSBM%JTQBUDI w ڧྗͳϓϩηοαʔͷྗΛҾ͖ग़͢ w ෆ۩߹ͷೖΓࠐΈͮΒ͍ฏߦॲཧ લఏͱͳΔٕज़ "QQMFͷҙਤ εϨουΛӅṭͰ͖͍ͯΔൣғ

4XJGU"UUSJCVUFT͸ҎԼΛࢀর IUUQTJSJNBTVDPNBQQMF TXJGUBUUSJCVUFT

΋ͬͱࠜఈͷ໰୊΋͋Δ

࢛൒ੈلલʹ౤͛ೖΕΒΕͨϚϧνεϨου ίϯγϡʔϚʔ04ʹϚϧνεϨου͕౤͛ࠐ·Ε࢛ͯ൒ੈل w 8JOEPXT͕ίϯγϡʔϚʔ04ͱͯ͠εϨουΛಋೖ w εϨουಋೖ͸ϚʔέςΟϯάతͳҙຯ͕ڧ͔ͬͨ w σʔλΛอޢͭͭ͠ฒߦͯ͠ಈ͘ΞΠσΞ͸ະख़ͷ··ϦϦʔε w ౰࣌ͷϓϩάϥϛϯάݴޠ
౰࣌ͷ$$ ͸ϚϧνεϨουಈ࡞͸࢓༷ʹؚΊ ͣ w Ҏޙͷݴޠ΋ϚϧνεϨουʹܾؔͯ͠ఆଧ͸ଧͪग़ͤͣ w ͨͩ͠.JDSPTPGU͸BTZODBXBJUͷಋೖࣗମ͸ૣ͔ͬͨ $ 5ZQF4DSJQU

4XJGU$PODVSSFODZ͕ղܾ͠Α͏ͱ͍ͯ͠Δ΋ͷ ࢛൒ੈلલʹ์Γग़͞Εͨ ϚϧνεϨουͷऔΓѻ͍Λ༰қʹ͢Δ ྫ֎ॲཧ USZʙDBUDI ΛฒߦॲཧͰ΋҆શʹߦ͏ ϞμϯͳϓϩάϥϛϯάݴޠͷϧοΫε΁ͷ௥ਵ
։ൃऀͷؒޱΛ֦͛Δ

·ͱΊ

·ͱΊ w 4XJGU$PODVSSFODZൃද͞Ε͔ͯΒ೥ۙ͘ܦͪ·ͨ͠ w ༗༻ͳࢿྉ͸ग़͖ͯ·͕ͨ͠࢓༷͕ڊେ͗ͯ͢औֻ͔ͬΓ͕গͳ͍Ͱ͢ w ߟҊ͍͔ͨͭ͘͠ͷऔֻ͔ͬΓΛઆ໌͠·ͨ͠ w B5X T
w 4XJGU$PODVSSFODZͷཧղ֊૚

J045FDI#MPHߋ৽த w4XJDU6*Λ࢖ͬͯ̍̌̌ߦͰαϯϓϧίʔυΛॻ͘ 4XJGUߦγϦʔζଞ"QQMF։ൃؔ܎ͷهࣄΛܝࡌத Ͱ͢ɻ JSJNBTVDPN OPUFDPNOPUPSPJE wʹ΋هࡌதͰ͢ɻ

ࢀߟ w 4XJGU$PODVSSFODZ·ͱΊʢਖ਼ࣜ൛ରԠࡁʣ w IUUQT[FOOEFWBLLZJFBSUJDMFTTXJGU DPODVSSFODZ w 4XJGU$PODVSSFODZνʔτγʔτ w IUUQT[FOOEFWLPIFSBSUJDMFTTXJGU
DPODVSSFODZDIFBUTIFFU w 4XJGU$PODVSSFODZͷXJUI5BTL$BODFMMBUJPO)BOEMFS ͱ4FOEBCMFDPDLTDPNCMPH w IUUQTDPDLTDPNCIBUFOBCMPHDPNFOUSZ w .PEFSO$PODVSSFODZJO4XJGU*OUSPEVDUJPOw "OEZ*CBOF[ w IUUQTXXXBOEZJCBOF[DPNQPTUTNPEFSO DPODVSSFODZJOTXJGUJOUSPEVDUJPO w "TZODBXBJU8JLJQFEJB w IUUQTFOXJLJQFEJBPSHXJLJ"TZODBXBJU w UISFBEɺDPSPVUJOFͷྫ֎Λసૹ͢Δʂʂ2JJUB w IUUQTRJJUBDPN:VLJ.JZBUBLFJUFNT EEEFFEB w <ϓϨθϯࢿྉ> "QQMF͕ ΍Γ͍ͨ์୊4XJGU "UUSJCVUFTc*SJNBTV%FOTBO1MBOOJOH͍Γ·͢ి ࢉاը w IUUQTJSJNBTVDPNBQQMFTXJGUBUUSJCVUFT

Swift Concurrencyの 尻尾を掴め ～ 並行処理を受け入れる取っ掛かり

Swift Concurrencyの 尻尾を掴め ～ 並行処理を受け入れる取っ掛かり

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Swift Concurrencyの尻尾を掴め～並行処理を受け入れる取っ掛かり

Swift Concurrencyの尻尾を掴め～並行処理を受け入れる取っ掛かり