Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
RxSwiftのobserveOnとsubscribeOnを理解する
Search
Shinichiro Oba
April 14, 2016
Programming
20
7.5k
RxSwiftのobserveOnとsubscribeOnを理解する
RxSwift勉強会 @ Sansanの発表資料です
http://connpass.com/event/27933/
Shinichiro Oba
April 14, 2016
Tweet
Share
More Decks by Shinichiro Oba
See All by Shinichiro Oba
サーバサイドエンジニアと効率よく開発するためにやっていること
bricklife
8
2.2k
アッテ開発の技術:Swift と RxSwift
bricklife
19
17k
Swift 2.0でRxSwift、ReactKit、ReactiveCocoaを使ってみた
bricklife
10
5k
ReactiveCocoaのゆるい紹介とメルカリでの活用事例
bricklife
3
3.8k
Apple Pay対応のやりかた
bricklife
1
25k
iOS版グローバル対応の罠と技
bricklife
8
24k
Other Decks in Programming
See All in Programming
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
1.2k
オンデバイスAIとXcode
ryodeveloper
0
120
bootcamp2025_バックエンド研修_WebAPIサーバ作成.pdf
geniee_inc
0
130
コード生成なしでモック処理を実現!ovechkin-dm/mockioで学ぶメタプログラミング
qualiarts
0
270
Amazon Verified Permissions実践入門 〜Cedar活用とAppSync導入事例/Practical Introduction to Amazon Verified Permissions
fossamagna
2
100
Claude CodeによるAI駆動開発の実践 〜そこから見えてきたこれからのプログラミング〜
iriikeita
0
350
オープンソースソフトウェアへの解像度🔬
utam0k
17
3.1k
AI Agent 時代的開發者生存指南
eddie
4
2.1k
なんでRustの環境構築してないのにRust製のツールが動くの? / Why Do Rust-Based Tools Run Without a Rust Environment?
ssssota
14
46k
contribution to astral-sh/uv
shunsock
0
540
Server Side Kotlin Meetup vol.16: 内部動作を理解して ハイパフォーマンスなサーバサイド Kotlin アプリケーションを書こう
ternbusty
3
250
ドメイン駆動設計のエッセンス
masuda220
PRO
5
1.1k
Featured
See All Featured
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.6k
Building Adaptive Systems
keathley
44
2.8k
Product Roadmaps are Hard
iamctodd
PRO
55
11k
KATA
mclloyd
PRO
32
15k
Java REST API Framework Comparison - PWX 2021
mraible
34
8.9k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
21
1.2k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
132
19k
Bash Introduction
62gerente
615
210k
Rails Girls Zürich Keynote
gr2m
95
14k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
37
2.6k
Embracing the Ebb and Flow
colly
88
4.9k
Transcript
3Y4XJGUͷPCTFSWF0Oͱ TVCTDSJCF0OΛཧղ͢Δ େఉ ৻Ұ גࣜձࣾϝϧΧϦ / גࣜձࣾικ 2016/4/14 RxSwiftษڧձ ˏ
Sansan 1
ࣗݾհ 2 େఉ ৻Ұ ooba / bricklife גࣜձࣾϝϧΧϦ 20134݄ೖࣾ ݱࡏגࣜձࣾικग़த
ʮϝϧΧϦʯiOS൛ͷ্ཱͪ͛ ʮϝϧΧϦ ΞοςʯiOS൛ͷ্ཱͪ͛
ϝϧΧϦΞος 3 ʮͳΜͰืूͰ͖Δ ɹҬίϛϡχςΟΞϓϦʯ 201510݄ ։ൃ։࢝ 20162݄ հ੍Ͱެ։ 20163݄ ਖ਼ࣜΦʔϓϯ
RxSwiftΛશ໘࠾༻
PCTFSWF0OͱTVCTDSJCF0O 4
PCTFSWF0Oʹؔ͢Δ᷿ͷઆ໌ 5 observeOnΑΓ͋ͱʹॻ͔Ε͍ͯΔΦϖ Ϩʔλͷ࣮ߦεϨουΛܾΊΔͷ Θ͔Γ͍͢ ࣮ࡍਖ਼͍͠
TVCTDSJCF0Oʹؔ͢Δ᷿ͷઆ໌ 6 ετϦʔϜશମͷ࣮ߦεϨουΛܾΊΔ ͷʁ subscribeOnΑΓલʹॻ͔Ε͍ͯΔΦϖ Ϩʔλͷ࣮ߦεϨουΛ͖ΊΔͷʁ Կճॻ͍ͯҰ൪্ͷsubscribeOn͚͕ͩ ༗ޮʹͳΔʁ
TVCTDSJCF0OͷϑΝʔετΠϯϓϨογϣϯ 7 ීஈʮsubscribeʯͱ͍͏୯ޠΛΈΔͷ ετϦʔϜͷߪಡ෦͚ͩ ͦͷͨΊɺ࠷ॳݟͨ࣌ʹ subscribeNextͳͲͷߪಡ෦ͷ࣮ߦε ϨουΛܾΊΔͷͩͱࢥͬͨ େ͖ͳؒҧ͍
ެࣜͷઆ໌ 8 http://reactivex.io/documentation/scheduler.html
؆୯ͳ༻ྫ 9 ίʔυɿ Observable.just(1) .subscribeOn(backgroundScheduler) .map { $0 * 2
} .observeOn(MainScheduler.instance) .subscribe { print($0) } ग़ྗɿ Next(2) Completed
؆୯ͳ༻ྫ 10 ίʔυɿ Observable.just(1) .subscribeOn(backgroundScheduler) .map { $0 * 2
} .observeOn(MainScheduler.instance) .subscribe { print($0) } ग़ྗɿ Next(2) Completed όοΫάϥϯυεϨουͰ࣮ߦ
؆୯ͳ༻ྫ 11 ίʔυɿ Observable.just(1) .subscribeOn(backgroundScheduler) .map { $0 * 2
} .observeOn(MainScheduler.instance) .subscribe { print($0) } ग़ྗɿ Next(2) Completed ϝΠϯεϨουͰ࣮ߦ
0CTFSWFSͱ 12
0CTFSWFSͱ 13 on()ͱ͍͏ϝιου͕࣮͞Ε͍ͯΔ Observable͕ͦΕΛͬͯΠϕϯτΛୡ ͢Δ ͢ͳΘͪObserverType
0CTFSWFS5ZQF 14 protocol ObserverType { associatedtype E func on(event: Event<E>)
}
0CTFSWBCMFͱ 15
0CTFSWBCMFͱ 16 subscribe()ͱ͍͏ϝιου͕࣮͞Ε͍ͯ Δ Observer͕ͦΕΛͬͯߪಡͰ͖Δ ͢ͳΘͪObservableType
0CTFSWBCMF5ZQF 17 protocol ObservableType : ObservableConvertibleType { associatedtype E func
subscribe<O: ObserverType where O.E == E> (observer: O) -> Disposable }
ΦϖϨʔλͱ 18
ΦϖϨʔλͱ 19 ObservableΛsubscribeͯ͠ɺ৽͍͠ ObservableΛ࡞Δͷ ObserverͱObservableͷ྆ํͷಇ͖Λ͢ Δ RxSwiftͰશͯͷΦϖϨʔλʹΫϥε͕ ఆٛ͞Ε͍ͯΔ
ͨͱ͑NBQ 20 map() = Map + MapSink https://github.com/ReactiveX/RxSwift/blob/2.4/ RxSwift/Observable.swift https://github.com/ReactiveX/RxSwift/blob/2.4/
RxSwift/Observables/Implementations/Map.swift MapObservable MapSinkObserver
PCTFSWF0OTVCTDSJCF0Oʁ ͪΖΜobserveOnsubscribeOnʹΫ ϥε͕ఆٛ͞Ε͍ͯΔ https://github.com/ReactiveX/RxSwift/blob/2.4/ RxSwift/Observables/Implementations/ ObserveOn.swift https://github.com/ReactiveX/RxSwift/blob/2.4/ RxSwift/Observables/Implementations/ SubscribeOn.swift 21
ΦϖϨʔλ͕͍ͬͯΔ͜ͱ
PCTFSWF0OTVCTDSJCF0OΛΘͳ͍ྫ 23 Observable.just(1) .map { $0 * 2 } .subscribe
{ print($0) } +VTU .BQ4JOL .BQ "OPOZNPVT0CTFSWFS
ॲཧͷྲྀΕ 24 +VTU .BQ4JOL .BQ "OPOZNPVT0CTFSWFS
ॲཧͷྲྀΕ 25 1. AnonymousObserver͕Mapͷsubscribe()Λ࣮ߦ subscribe() ↑ +VTU .BQ4JOL .BQ "OPOZNPVT0CTFSWFS
ॲཧͷྲྀΕ 26 1. AnonymousObserver͕Mapͷsubscribe()Λ࣮ߦ 2. MapSink͕Justͷsubscribe()Λ࣮ߦ subscribe() ↑ +VTU .BQ4JOL
.BQ "OPOZNPVT0CTFSWFS subscribe() ↑
ॲཧͷྲྀΕ 27 1. AnonymousObserver͕Mapͷsubscribe()Λ࣮ߦ 2. MapSink͕Justͷsubscribe()Λ࣮ߦ 3. Just͕MapSinkͷon()Λ࣮ߦ subscribe() ↑
subscribe() ↑ ↓ on() +VTU .BQ4JOL .BQ "OPOZNPVT0CTFSWFS
ॲཧͷྲྀΕ 28 1. AnonymousObserver͕Mapͷsubscribe()Λ࣮ߦ 2. MapSink͕Justͷsubscribe()Λ࣮ߦ 3. Just͕MapSinkͷon()Λ࣮ߦ 4. Map͕AnonymousObserverͷon()Λ࣮ߦ
※ݫີʹͪΐͬͱҧ͏ subscribe() ↑ subscribe() ↑ ↓ on() ↓ on() +VTU .BQ4JOL .BQ "OPOZNPVT0CTFSWFS
PCTFSWF0OTVCTDSJCF0OΛͬͨྫ 29 Observable.just(1) .subscribeOn(backgroundScheduler) .map { $0 * 2 }
.observeOn(MainScheduler.instance) .subscribe { print($0) }
ॲཧͷྲྀΕ 30 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ 4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU
1. AnonymousObserver͕ObserveOnͷsubscribe()Λ࣮ ߦ ॲཧͷྲྀΕ 31 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑
2. ObserveOnSink͕Mapͷsubscribe()Λ࣮ߦ ॲཧͷྲྀΕ 32 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ 4VCTDSJCF0O4JOL
4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑
3. MapSink͕SubscribeOnͷsubscribe()Λ࣮ߦ ॲཧͷྲྀΕ 33 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ 4VCTDSJCF0O4JOL
4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑
4. SubscribeOnSink͕Justͷsubscribe()Λ backgroundScheduler্Ͱ࣮ߦ ॲཧͷྲྀΕ 34 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑ subscribe() ↑
5. Just͕SubscribeOnSinkͷon()ΛbackgroundScheduler ্Ͱ࣮ߦ ॲཧͷྲྀΕ 35 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑ subscribe() ↑ ↓ on()
6. SubscribeOn͕MapSinkͷon()ΛbackgroundScheduler ্Ͱ࣮ߦ ॲཧͷྲྀΕ 36 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑ subscribe() ↑ ↓ on() ↓ on()
7. Map͕ObserveOnSinkͷon()ΛbackgroundScheduler ্Ͱ࣮ߦ ॲཧͷྲྀΕ 37 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑ subscribe() ↑ ↓ on() ↓ on() ↓ on()
8. ObserveOn͕AnonymousObserverͷon()Λ MainScheduler্Ͱ࣮ߦ ॲཧͷྲྀΕ 38 0CTFSWF0O4JOL 0CTFSWF0O "OPOZNPVT0CTFSWFS .BQ4JOL .BQ
4VCTDSJCF0O4JOL 4VCTDSJCF0O +VTU subscribe() ↑ subscribe() ↑ subscribe() ↑ subscribe() ↑ ↓ on() ↓ on() ↓ on() ↓ on()
ཁ͢Δʹ 39 • subscribeOnҎ߱(Observableํ)ͷ subscribe()ͷ࣮ߦεϨουΛܾΊΔ • observeOnҎ߱(Observerํ)ͷon() ͷ࣮ߦεϨουΛܾΊΔ ͱ͍͏ͷ͕ਖ਼͍͠ཧղʢͷͣʣ
TVCTDSJCF0O͕ޮ͔ͳ͍έʔε
TVCTDSJCF0O͕ޮ͔ͳ͍έʔεͦͷ̍ 41 NSURLSessionͷrx_response • ࣮ߦεϨουNSURLSessionͷઃఆͰܾ·Δ • ϦΫΤετΛ͛Δͱ͜ΖͰޮ͘
/463-4FTTJPOͷSY@SFTQPOTF 42 func rx_response(request: NSURLRequest) -> Observable<(NSData, NSHTTPURLResponse)> { return
Observable.create { observer in let task = self.dataTaskWithRequest(request) { (data, response, error) in guard let response = response, data = data else { observer.on(.Error(error ?? RxCocoaURLError.Unknown)) return } guard let httpResponse = response as? NSHTTPURLResponse else { observer.on(.Error(RxCocoaURLError.NonHTTPResponse(response: response))) return } observer.on(.Next(data, httpResponse)) observer.on(.Completed) } let t = task t.resume() return AnonymousDisposable { task.cancel() } } } https://github.com/ReactiveX/RxSwift/blob/2.4/ RxCocoa/Common/Observables/NSURLSession+Rx.swift この部分の実⾏スレッドはRxの機能では指定できない
TVCTDSJCF0O͕ޮ͔ͳ͍έʔεͦͷ̎ 43 ͢Ͱʹ࣮ߦεϨου͕ܾ·͍ͬͯΔͷ • Hot Observableશൠ - PublishSubjectBehaviorSubjectͳͲͷSubjectܥ - shareReplay(1)ͳͲͷΦϖϨʔλʹΑͬͯHotԽ͞Εͨ
Observable • UIKitܥͷRx֦ு • Driver
ݟ 44 ڍಈͷཧղʹࣗ৴͕ͳ͔ͬͨΒιʔεΛ ಡΉͱ͍͍ʢ͋ͨΓ·͑ʣ
͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ