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Flux with RxSwift AbemaTV Developer Conference 2016 Yuji Hato

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About me Yuji Hato CyberAgent, Inc. / AbemaTV, Inc. dekatotoro @dekatotoro Contributed services

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What is Flux?

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What is Flux? IUUQTGBDFCPPLHJUIVCJPqVYEPDTPWFSWJFXIUNM “Data in a Flux application flows in a single direction”

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What is Flux? IUUQTHJUIVCDPNGBDFCPPLqVY

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What is Flux? IUUQTHJUIVCDPNGBDFCPPLqVY

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What is Flux? IUUQTHJUIVCDPNGBDFCPPLqVY Observer ύλʔϯ !

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Why Flux?

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Why Flux? ࡢࠓͷΞϓϦ։ൃ͸ෳࡶԽ ͷҰ్Λḷ͓ͬͯΓঢ়ଶ؅ཧ ͕େม

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Why Flux? AbemaTVͷঢ়ଶ؅ཧ: Cast ΦϯσϚϯυ ՝ۚ CM Filler ը࣭ ࢹௌ༧໿ etc… ൪૊ Fresh ίϝϯτ ࢹௌ਺ FullScreen Feed

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Why Flux? ͭΒ͍…

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Why Flux? UIૢ࡞ɾ࣌ؒʹ൐͏ෳࡶͳ ঢ়ଶભҠΛ෼͔Γ΍͍ͨ͘͢͠

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Why Flux? Viewؒͷґଘؔ܎ΛݮΒ͍ͨ͠

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MVVM MVC DDD Flux Clean Architecture MVP Why Flux? Flux͕޲͍ͯͦ͏…?

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Flux with RxSwift

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Flux with RxSwift Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Flux with RxSwift Event StreamͰܨ͍͡Ό͓͏ͥ

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Flux with RxSwift Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Flux with RxSwift Dispatcher ViewController View Store Events Events Events Event͸̎छྨͷHot ObservableΛ࢖͏

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Flux with RxSwift PublishSubject Ұ੾Ωϟογϡ͠ͳ͍Subject Events

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Flux with RxSwift Variable ௚ۙͷ஋Λ͚̍ͭͩΩϟογϡ͢ΔSubject ※BehaviorSubjectͷwrapper Events

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Dispatcher

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Dispatcher Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Dispatcher Dispatcherͷϑϩʔ Dispatcher Store Events Events Action Dispatcher Store Store Events Events Action Action

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Dispatcher Action͕dispatch͢Δ Dispatcher Store Store Events Events Action Action on subscribe

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Dispatcher dispatch͞ΕͨΒStore΁௨஌ Dispatcher Store Store Events Events Action Action on subscribe

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Dispatcher class DispatchSubject: ObservableType, ObserverType { typealias E = Element fileprivate let subject = PublishSubject() func dispatch(_ value: E) { on(.next(value)) } func on(_ event: Event) { subject.on(event) } func subscribe(_ observer: O) -> Disposable where O.E == E { return subject.subscribe(observer) } } Dispatcher༻ͷDispatchSubject

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Dispatcher class DispatchSubject: ObservableType, ObserverType { typealias E = Element fileprivate let subject = PublishSubject() func dispatch(_ value: E) { on(.next(value)) } func on(_ event: Event) { subject.on(event) } func subscribe(_ observer: O) -> Disposable where O.E == E { return subject.subscribe(observer) } } PublishSubjectͷWrapper

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Dispatcher class DispatchSubject: ObservableType, ObserverType { typealias E = Element fileprivate let subject = PublishSubject() func dispatch(_ value: E) { on(.next(value)) } func on(_ event: Event) { subject.on(event) } func subscribe(_ observer: O) -> Disposable where O.E == E { return subject.subscribe(observer) } } dispatch͢ΔͱeventΛൃߦ͠·͢

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Dispatcher class SomeDispatcher { static let shared = SomeDispatcher() let loading = DispatchSubject() let error = DispatchSubject() let someModel = DispatchSubject() … } DispatcherΫϥε

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Dispatcher class SomeDispatcher { static let shared = SomeDispatcher() let loading = DispatchSubject() let error = DispatchSubject() let someModel = DispatchSubject() … } ActionTypeͷ୅ΘΓʹDispatchSubjectΛෳ਺༻ҙ ※DispatcherΫϥε΋༻్͝ͱʹ෼͚ͯ·͢

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Dispatcher func someAction(value: Bool) { … dispatcher.loading.dispatch(value) … } Action͕dispatch

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Action

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Action Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Action Actionͷϑϩʔ Action Action Dispatcher User Interactions API DB ViewController View Action Action Dispatcher API DB ViewController View Device User Interactions

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Action View͔ΒActionΛ࣮ߦ Action Action Dispatcher User Interactions API DB ViewController View Action Action Dispatcher API DB ViewController View Device User Interactions Action Action Dispatcher User Interactions API DB ViewController View Action Action Action Dispatcher API DB ViewController View Device User Interactions

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Action ඞཁͳσʔλΛऔಘ͢Δ Action Action Dispatcher User Interactions API DB ViewController View Action Action Action Dispatcher API DB ViewController View Device User Interactions

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Action UI, Web, DB, DevicesΛ֎෦IFͱͯ͠ଊ͑Δ IUUQTUIMJHIUDPNCMPHVODMFCPCUIFDMFBOBSDIJUFDUVSFIUNM

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Action σʔλͷऔಘޙDispatcher΁ྲྀ͢ Action Action Dispatcher User Interactions API DB ViewController View Action Action Action Dispatcher API DB ViewController View Device User Interactions

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Action func someAction(query: String) { dispatcher.loading.dispatch(true) API.getSome(with: query) .do(onError: { [unowned self] error in self.dispatcher.error.dispatch(error) self.dispatcher.loading.dispatch(false) }) .do(onCompleted: { [unowned self] error in self.dispatcher.loading.dispatch(false) }) .subscribe(onNext: { [unowned self] response in let someModel = SomeModel.make(from: response) self.dispatcher.someModel.dispatch(someModel) }) .addDisposableTo(disposeBag) } APIΛ࣮ߦ͢Δྫ

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Action func someAction(query: String) { dispatcher.loading.dispatch(true) API.getSome(with: query) .do(onError: { [unowned self] error in self.dispatcher.error.dispatch(error) self.dispatcher.loading.dispatch(false) }) .do(onCompleted: { [unowned self] error in self.dispatcher.loading.dispatch(false) }) .subscribe(onNext: { [unowned self] response in let someModel = SomeModel.make(from: response) self.dispatcher.someModel.dispatch(someModel) }) .addDisposableTo(disposeBag) } ϩʔσΟϯάͯ͠API࣮ߦ

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Action func someAction(query: String) { dispatcher.loading.dispatch(true) API.getSome(with: query) .do(onError: { [unowned self] error in self.dispatcher.error.dispatch(error) self.dispatcher.loading.dispatch(false) }) .do(onCompleted: { [unowned self] error in self.dispatcher.loading.dispatch(false) }) .subscribe(onNext: { [unowned self] response in let someModel = SomeModel.make(from: response) self.dispatcher.someModel.dispatch(someModel) }) .addDisposableTo(disposeBag) } Τϥʔͷ࣌

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Action func someAction(query: String) { dispatcher.loading.dispatch(true) API.getSome(with: query) .do(onError: { [unowned self] error in self.dispatcher.error.dispatch(error) self.dispatcher.loading.dispatch(false) }) .do(onCompleted: { [unowned self] error in self.dispatcher.loading.dispatch(false) }) .subscribe(onNext: { [unowned self] response in let someModel = SomeModel.make(from: response) self.dispatcher.someModel.dispatch(someModel) }) .addDisposableTo(disposeBag) } Ϩεϙϯε͕ฦ͖ͬͯͨ࣌

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Action func someAction(query: String) { dispatcher.loading.dispatch(true) API.getSome(with: query) .do(onError: { [unowned self] error in self.dispatcher.error.dispatch(error) self.dispatcher.loading.dispatch(false) }) .do(onCompleted: { [unowned self] error in self.dispatcher.loading.dispatch(false) }) .subscribe(onNext: { [unowned self] response in let someModel = SomeModel.make(from: response) self.dispatcher.someModel.dispatch(someModel) }) .addDisposableTo(disposeBag) } ࣮ߦ͕׬ྃͨ࣌͠

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Store

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Store Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Store Storeͷϑϩʔ Dispatcher Store Store ViewController View Events Events Events

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Store DispatcherͷeventΛObserve͢Δ Dispatcher Store Store ViewController View Events Events Events subscribe on on subscribe

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Store DispatcherͷΠϕϯτ͕ྲྀΕͯ͘Δ Store Store ViewController View Events Events Events subscribe on on subscribe Dispatcher

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Store DispatcherͷΠϕϯτΛݕ஌ͨ͠ΒσʔλΛߋ৽ Store Store ViewController View Events Events Events subscribe on on subscribe Dispatcher

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Store σʔλΛߋ৽ͨ͠ΒView΁௨஌ Store Store ViewController View Events Events Events subscribe subscribe Dispatcher on on

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Flux: Store class Store { let disposeBag = DisposeBag() func bind(_ observable: O, _ param: Variable) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } func bind(_ observable: O, _ param: PublishSubject) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } } Store਌Ϋϥε

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Flux: Store class Store { let disposeBag = DisposeBag() func bind(_ observable: O, _ param: Variable) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } func bind(_ observable: O, _ param: PublishSubject) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } } Variable༻ͷbind

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Flux: Store class Store { let disposeBag = DisposeBag() func bind(_ observable: O, _ param: Variable) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } func bind(_ observable: O, _ param: PublishSubject) where O: ObservableType, E == O.E { observable.bindTo(param).addDisposableTo(disposeBag) } } PublishSubject༻ͷbind

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Flux: Store class SomeStore: Store { static let shared = SomeStore() let loading = Variable(false) let error = PublishSubject() let someModel = Variable(SomeModel()) init(dispatcher: SomeDispatcher = .shared) { super.init() bind(dispatcher.loading, loading) bind(dispatcher.error, error) bind(dispatcher.someModel, someModel) } } StoreΫϥε

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Flux: Store class SomeStore: Store { static let shared = SomeStore() let loading = Variable(false) let error = PublishSubject() let someModel = Variable(SomeModel()) init(dispatcher: SomeDispatcher = .shared) { super.init() bind(dispatcher.loading, loading) bind(dispatcher.error, error) bind(dispatcher.someModel, someModel) } } StoreΫϥε͸Singleton

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Flux: Store class SomeStore: Store { static let shared = SomeStore() let loading = Variable(false) let error = PublishSubject() let someModel = Variable(SomeModel()) init(dispatcher: SomeDispatcher = .shared) { super.init() bind(dispatcher.loading, loading) bind(dispatcher.error, error) bind(dispatcher.someModel, someModel) } } Storeͷproperty͸VariableͱPublishSubject

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Flux: Store class SomeStore: Store { static let shared = SomeStore() let loading = Variable(false) let error = PublishSubject() let someModel = Variable(SomeModel()) init(dispatcher: SomeDispatcher = .shared) { super.init() bind(dispatcher.loading, loading) bind(dispatcher.error, error) bind(dispatcher.someModel, someModel) } } initͰdispatcherͱbind

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View

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View Action Dispatcher User Interactions API DB ViewController View Store Events Events

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View Viewͷϑϩʔ Dispatcher Events Store Store ViewController View Events Action Action Action User Interactions ViewController View Action

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View StoreͱUIͷeventΛObserve͢Δ Dispatcher Events Store Store ViewController View Events subscribe Action Action User Interactions ViewController View Action

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View StoreͷΠϕϯτ͕ྲྀΕͯ͘Δ Dispatcher Events Store Store ViewController View Events on Action Action User Interactions ViewController View Action

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View StoreͷΠϕϯτΛݕ஌ͨ͠ΒViewΛߋ৽ Dispatcher Events Store Store ViewController View Events on Action Action User Interactions ViewController View Action

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View UIͷeventΛτϦΨʔʹActionΛ࣮ߦ Dispatcher Events Store Store ViewController View Events Action Action User Interactions ViewController View Action

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) Storeͷobserve

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) StoreͷloadingΛobserve

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) loadingViewͷදࣔ/ඇදࣔ

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) StoreͷerrorΛobserve

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) ErrorActionΛ࣮ߦ

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) StoreͷsomeModelΛobserve

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View store.loading.asObservable() .distinctUntilChanged() .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] loading in self.loadingView.hidden(!loading) }) .addDisposableTo(rx_disposeBag) store.error .subscribe(onNext: { error in ErrorAction.show(.apiError(error)) }) .addDisposableTo(rx_disposeBag) store.someModel.asObservable() .map { $0.dataSource } .observeOn(MainScheduler.instance) .subscribe(onNext: { [unowned self] dataSource in self.dataSource.value = dataSource self.tableView?.reloadData() }) .addDisposableTo(rx_disposeBag) tableViewΛreload

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View searchBar.rx.text.asDriver() .throttle(0.3) .distinctUntilChanged() .drive(onNext: { query in SomeAction.someAction(query: query) }) .addDisposableTo(rx_disposeBag) UIͷeventΛobserve

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View searchBar.rx.text.asDriver() .throttle(0.3) .distinctUntilChanged() .drive(onNext: { query in SomeAction.someAction(query: query) }) .addDisposableTo(rx_disposeBag) searchBarͷtextೖྗΛobserve

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View searchBar.rx.text.asDriver() .throttle(0.3) .distinctUntilChanged() .drive(onNext: { query in SomeAction.someAction(query: query) }) .addDisposableTo(rx_disposeBag) ೖྗ͞Εͨจࣈʹมߋ͕͋ΔຖʹActionΛ࣮ߦ

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Flux with RxSwift Action Dispatcher User Interactions API DB ViewController View Store Events Events

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Ұप͠·ͨ͠ʂ Flux with RxSwift

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Proposals

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Proposals • Dispatcher͸Ұͭʹ͍ͨ͠ • Store͸SingletonͰͳ͘ɺద੾ͳϥΠϑαΠ Ϋϧʹ͍ͨ͠ • StoreΛread-onlyʹ͍ͨ͠

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Conclusion

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Conclusion Pros • ෳ਺ͷViewController, ViewΛ࢖ͬͯෳࡶͳঢ়ଶ ؅ཧΛ͢ΔΞϓϦέʔγϣϯʹ޲͍͍ͯΔ • ։ൃऀͷ࣮૷͕౷Ұ͞Ε΍͍͢ • Viewؒͷґଘؔ܎͕ݮΔ

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Conclusion Cons • SingletonͰूத؅ཧͳͷͰɺ޷͖ݏ͍͋Δ͔΋ • ׳ΕΔ·Ͱগ͔͔͠Δ • ࣮૷͕৑௕ʹײ͡Δ…?

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Flux͸࿮૊ΈͳͷͰɺΑΓྑ͘͢ΔͨΊʹ νʔϜͰTrial&Errorͯ͠·͢ Flux with RxSwift

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Thank you ࢀߟࢿྉ https://facebook.github.io/flux/ https://github.com/facebook/flux https://github.com/thoughtbot/Delta https://github.com/yonekawa/SwiftFlux https://speakerdeck.com/ogaclejapan/flux-de-relax

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https://github.com/dekatotoro/FluxWithRxSwiftSample Flux with RxSwift Sample