mastodon-ios/Mastodon/Service/StatusPublishService.swift

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