109 lines
2.6 KiB
Swift
109 lines
2.6 KiB
Swift
//
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// FeedlyOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 20/9/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import RSWeb
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protocol FeedlyOperationDelegate: class {
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func feedlyOperation(_ operation: FeedlyOperation, didFailWith error: Error)
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}
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/// Abstract class common to all the tasks required to ingest content from Feedly into NetNewsWire.
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/// Each task should try to have a single responsibility so they can be easily composed with others.
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class FeedlyOperation: Operation {
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weak var delegate: FeedlyOperationDelegate?
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var downloadProgress: DownloadProgress? {
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didSet {
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guard downloadProgress == nil || !isExecuting else {
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fatalError("\(\FeedlyOperation.downloadProgress) was set to late. Set before operation starts executing.")
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}
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oldValue?.completeTask()
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downloadProgress?.addToNumberOfTasksAndRemaining(1)
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}
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}
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func didFinish() {
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assert(Thread.isMainThread)
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assert(!isFinished, "Finished operation is attempting to finish again.")
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downloadProgress = nil
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updateExecutingAndFinished(false, true)
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}
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func didFinish(_ error: Error) {
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assert(Thread.isMainThread)
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assert(!isFinished, "Finished operation is attempting to finish again.")
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delegate?.feedlyOperation(self, didFailWith: error)
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didFinish()
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}
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override func cancel() {
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// If the operation never started, disown the download progress.
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if !isExecuting && !isFinished, downloadProgress != nil {
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DispatchQueue.main.async {
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self.downloadProgress = nil
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}
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}
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super.cancel()
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}
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override func start() {
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guard !isCancelled else {
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updateExecutingAndFinished(false, true)
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if downloadProgress != nil {
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DispatchQueue.main.async {
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self.downloadProgress = nil
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}
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}
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return
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}
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updateExecutingAndFinished(true, false)
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DispatchQueue.main.async {
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self.main()
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}
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}
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override var isExecuting: Bool {
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return isExecutingOperation
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}
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override var isFinished: Bool {
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return isFinishedOperation
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}
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private var isExecutingOperation = false
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private var isFinishedOperation = false
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private func updateExecutingAndFinished(_ executing: Bool, _ finished: Bool) {
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let isExecutingDidChange = executing != isExecutingOperation
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let isFinishedDidChange = finished != isFinishedOperation
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if isFinishedDidChange {
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willChangeValue(for: \.isFinished)
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}
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if isExecutingDidChange {
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willChangeValue(for: \.isExecuting)
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}
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isExecutingOperation = executing
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isFinishedOperation = finished
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if isExecutingDidChange {
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didChangeValue(for: \.isExecuting)
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}
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if isFinishedDidChange {
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didChangeValue(for: \.isFinished)
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}
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}
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}
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