RxSwift Scheduler

Mobile Act OSAKA #6
https://mobileact.connpass.com/event/93121/

ブログ記事
https://usami-k.hatenablog.com/entry/2018/08/22/003823

Transcript

1. RxSwiftͷεέδϡʔϥ USAMI Kosuke Fenrir Inc.
2. RxSwift • ඇಉظΠϕϯτΛड͚औΔͨΊͷ࿮૊Έ • UI Πϕϯτड͚औΓ • Web API Ϩεϙϯεड͚औΓ • σʔλͷมԽͷ؂ࢹ
3. ྫ hogeObservable .subscribe(onNext: { _ in // ΠϕϯτΛड͚औͬͨͱ͖ͷॲཧ })
4. ඇಉظΠϕϯτͱεϨου • ඇಉظΠϕϯτʹಉظతͰͳ͍ʹผεϨουͰൃੜ͢Δ • Rx ͰεϨου͸ͲͷΑ͏ʹѻΘΕΔͷ͔ʁ
5. εέδϡʔϥ • Rx ͰεϨουʹ౰ͨΔ֓೦ • ʢਖ਼֬ʹ͸εϨουͱ1ର1Ͱ͸ͳ͍͚Ͳɺ͜͜Ͱ͸লུʣ
6. ༨ஊɿRx ͷࡾཁૉ • Observable • Operator • Scheduler
7. εέδϡʔϥ
8. Observable ͱ Observer • ΠϕϯτൃੜݩͱΠϕϯτॲཧ
9. Scheduler • ͦΕͧΕʹεέδϡʔϥΛࢦఆͰ͖Δ
10. observeOn • ΠϕϯτॲཧͷεέδϡʔϥΛม͑Δ
11. ྫ hogeObservable .observeOn(MainScheduler.instance) .subscribe(onNext: { _ in // ϝΠϯεϨουͰಈ࡞͢Δ })
12. subscribeOn • ΠϕϯτൃੜݩͷεέδϡʔϥΛม͑Δ
13. ྫ hogeObservable .subscribeOn(hogeScheduler) .do(onNext: { _ in // hogeScheduler Ͱಈ࡞͢Δ } .observeOn(MainScheduler.instance) .subscribe(onNext: { _ in // ϝΠϯεϨουͰಈ࡞͢Δ })
14. εϨου੍ޚ·ͱΊ • subscribeOn : Πϕϯτൃੜݩͷεέδϡʔϥࢦఆ • Web API ࣮ߦεϨουͷࢦఆ • σʔλϕʔεΞΫηεεϨουͷࢦఆ • observeOn : Πϕϯτॲཧͷεέδϡʔϥͷࢦఆ • UI ॲཧεϨουͷࢦఆ
15. ஫ҙ఺ • subscribeOn Ͱ੾Γସ͑Ͱ͖ͳ͍৔߹͕͋Δ • ͦΕ͸ Observable ͷੑ࣭ʹΑΔ
16. Hot ͱ Cold
17. subscribeOn ͕ޮ͔ͳ͍৔߹ • Hot ͳ Observable ͷ৔߹͸੾Γସ͑Ͱ͖ͳ͍ • Cold ͳ Observable ͷ৔߹͸੾Γସ͑Ͱ͖Δ
18. ྫɿ੾Γସ͑Ͱ͖ͳ͍έʔε let hogeRelay = BehaviorRelay(value: "A") let hogeThread = Thread() { sleep(1) hogeRelay.accept("B") sleep(1) hogeRelay.accept("C") } hogeThread.start()
19. ྫɿ੾Γସ͑Ͱ͖ͳ͍έʔε hogeRelay .subscribeOn(MainScheduler.instance) .do(onNext: { _ in // hogeThread Ͱ accept ͨ͠΋ͷ͸ hogeThread Ͱಈ࡞ } .observeOn(MainScheduler.instance) .subscribe(onNext: { _ in // ϝΠϯεϨουͰಈ࡞͢Δ })
20. Observable ͷ෼ྨ : Hot / Cold • Hot • subscribe ͠ͳͯ͘΋ετϦʔϜ͕ྲྀΕΔ • subscribeOn Ͱ੍ޚͰ͖ͳ͍ • Cold • subscribe ͨ͠ΒετϦʔϜ͕ྲྀΕग़͢ • subscribeOn Ͱ੍ޚͰ͖Δ
21. ͲΕ͕ Hot ͰͲΕ͕ Cold ͔ʁ • Hot • Subject ΍ Relay • Rx ͷ֎ଆ͔ΒετϦʔϜʹΠϕϯτΛૹΕΔ • Cold • ্هҎ֎͸͍͍ͩͨ Cold • Rx ͷ੍ޚԼʹ͋Δ
22. ·ͱΊ
23. ·ͱΊ • εέδϡʔϥ • ੾Γସ͑Δํ๏ • Hot ͱ Cold • Hot ͸੾Γସ͑Ͱ͖ͳ͍