80 lines
2.8 KiB
Swift
80 lines
2.8 KiB
Swift
//
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// StatusPublishService.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-3-26.
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//
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import os.log
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import Foundation
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import Intents
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import Combine
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import CoreData
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import CoreDataStack
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import MastodonSDK
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import UIKit
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final class StatusPublishService {
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var disposeBag = Set<AnyCancellable>()
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let workingQueue = DispatchQueue(label: "org.joinmastodon.app.StatusPublishService.working-queue")
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// input
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var viewModels = CurrentValueSubject<[ComposeViewModel], Never>([]) // use strong reference to retain the view models
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// output
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let composeViewModelDidUpdatePublisher = PassthroughSubject<Void, Never>()
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let latestPublishingComposeViewModel = CurrentValueSubject<ComposeViewModel?, Never>(nil)
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init() {
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Publishers.CombineLatest(
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viewModels.eraseToAnyPublisher(),
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composeViewModelDidUpdatePublisher.eraseToAnyPublisher()
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)
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.map { viewModels, _ in viewModels.last }
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.assign(to: \.value, on: latestPublishingComposeViewModel)
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.store(in: &disposeBag)
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}
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}
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extension StatusPublishService {
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func publish(composeViewModel: ComposeViewModel) {
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workingQueue.sync {
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guard !self.viewModels.value.contains(where: { $0 === composeViewModel }) else { return }
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self.viewModels.value = self.viewModels.value + [composeViewModel]
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composeViewModel.publishStateMachinePublisher
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.receive(on: DispatchQueue.main)
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.sink { [weak self, weak composeViewModel] state in
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guard let self = self else { return }
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guard let composeViewModel = composeViewModel else { return }
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: composeViewModelDidUpdate", ((#file as NSString).lastPathComponent), #line, #function)
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self.composeViewModelDidUpdatePublisher.send()
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switch state {
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case is ComposeViewModel.PublishState.Finish:
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self.remove(composeViewModel: composeViewModel)
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default:
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break
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}
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}
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.store(in: &composeViewModel.disposeBag) // cancel subscription when viewModel dealloc
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}
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}
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func remove(composeViewModel: ComposeViewModel) {
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workingQueue.async {
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var viewModels = self.viewModels.value
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viewModels.removeAll(where: { $0 === composeViewModel })
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self.viewModels.value = viewModels
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: composeViewModel removed", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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}
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