67 lines
2.3 KiB
Swift
67 lines
2.3 KiB
Swift
//
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// ModelHanlderPublisher.swift
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// VDS
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//
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// Created by Matt Bruce on 8/12/22.
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//
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import Foundation
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import Combine
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extension Publishers {
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public struct ModelHandlerPublisher<ModelHandlerType: ModelHandlerable>: Publisher {
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public typealias Output = ModelHandlerType.ModelType
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public typealias Failure = Never
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private let modelHandler: ModelHandlerType
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public init(modelHandler: ModelHandlerType) { self.modelHandler = modelHandler }
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public func receive<S>(subscriber: S) where S : Subscriber, Never == S.Failure, ModelHandlerType.ModelType == S.Input {
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let subscription = ModelHandlerSubscription(subscriber: subscriber, modelHandler: modelHandler)
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subscriber.receive(subscription: subscription)
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}
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}
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public class ModelHandlerSubscription<S: Subscriber, ModelHandlerType: ModelHandlerable>: Subscription where S.Input == ModelHandlerType.ModelType, S.Failure == Never {
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private var subscriber: S?
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private var modelHandler: ModelHandlerType?
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public var subscribers = Set<AnyCancellable>()
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public init(subscriber: S, modelHandler: ModelHandlerType) {
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self.subscriber = subscriber
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self.modelHandler = modelHandler
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subscribe()
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}
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public func request(_ demand: Subscribers.Demand) { }
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public func cancel() {
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subscriber = nil
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modelHandler = nil
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}
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private func subscribe() {
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guard let publisher = modelHandler?.modelPublisher else { return }
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publisher.debounce(for: .seconds(Constants.ModelStateDebounce), scheduler: RunLoop.main).sink { [weak self] viewModel in
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guard let self else { return }
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_ = self.subscriber?.receive(viewModel)
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}.store(in: &subscribers)
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}
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}
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}
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extension ModelHandlerable {
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public var handlerPublisher: Publishers.ModelHandlerPublisher<Self> {
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return Publishers.ModelHandlerPublisher(modelHandler: self)
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}
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public func createBinding(with subject: CurrentValueSubject<ModelType, Never>, storeIn subscriptions: inout Set<AnyCancellable>) {
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handlerPublisher.sink { (value) in
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subject.send(value)
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}.store(in: &subscriptions)
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}
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}
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