114 lines
3.5 KiB
Swift
114 lines
3.5 KiB
Swift
//
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// Copyright (c) 2018 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import RxSwift
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import RxCocoa
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class RxDataLoadingModel<DLS: DataLoadingState>: DataLoadingModel
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where DLS.DataSourceType: RxDataSource {
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public typealias LoadingStateType = DLS
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typealias DataSourceType = DLS.DataSourceType
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typealias ResultType = DataSourceType.ResultType
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public typealias EmptyResultChecker = (ResultType) -> Bool
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private let stateVariable = Variable<LoadingStateType>(.initialState)
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var currentRequestDisposable: Disposable?
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let scheduler = SerialDispatchQueueScheduler(qos: .default)
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var dataSource: DataSourceType
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let emptyResultChecker: EmptyResultChecker
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public var stateDriver: Driver<LoadingStateType> {
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return stateVariable.asDriver()
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}
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public init(dataSource: DataSourceType, emptyResultChecker: @escaping EmptyResultChecker) {
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self.dataSource = dataSource
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self.emptyResultChecker = emptyResultChecker
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}
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public func reload() {
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load(isRetry: false)
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}
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public func retry() {
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load(isRetry: true)
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}
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private func load(isRetry: Bool) {
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currentRequestDisposable?.dispose()
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if isRetry {
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state = .initialState
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}
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state = .loadingState(after: state)
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requestResult(from: dataSource)
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}
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func onGot(error: Error) {
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state = .errorState(error: error,
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after: state)
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}
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private func onGot(result: ResultType, from dataSource: DataSourceType) {
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if emptyResultChecker(result) {
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state = .emptyState
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} else {
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state = .resultState(result: result,
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from: dataSource,
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after: state)
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updateStateAfterNonEmptyResult(from: dataSource)
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}
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}
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func requestResult(from dataSource: DataSourceType) {
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currentRequestDisposable = dataSource
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.resultSingle()
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.observeOn(scheduler)
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.subscribe(onSuccess: { [weak self] result in
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self?.onGot(result: result, from: dataSource)
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}, onError: { [weak self] error in
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self?.onGot(error: error)
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})
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}
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func updateStateAfterNonEmptyResult(from dataSource: DataSourceType) {
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// override in subcass if needed
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}
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var state: LoadingStateType {
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get {
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return stateVariable.value
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}
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set {
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stateVariable.value = newValue
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}
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}
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}
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