85 lines
1.9 KiB
Swift
85 lines
1.9 KiB
Swift
//
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// FeedMetadataFile.swift
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// Account
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//
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// Created by Maurice Parker on 9/13/19.
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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 os.log
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import RSCore
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final class FeedMetadataFile {
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private var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "FeedMetadataFile")
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private let fileURL: URL
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private let account: Account
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private var isDirty = false {
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didSet {
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queueSaveToDiskIfNeeded()
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}
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}
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private let saveQueue = CoalescingQueue(name: "Save Queue", interval: 0.5)
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init(filename: String, account: Account) {
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self.fileURL = URL(fileURLWithPath: filename)
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self.account = account
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}
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func markAsDirty() {
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isDirty = true
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}
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func load() {
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if let fileData = try? Data(contentsOf: fileURL) {
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let decoder = PropertyListDecoder()
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account.feedMetadata = (try? decoder.decode(Account.FeedMetadataDictionary.self, from: fileData)) ?? Account.FeedMetadataDictionary()
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}
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for value in account.feedMetadata.values {
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value.delegate = account
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}
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}
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func save() {
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guard !account.isDeleted else { return }
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let feedMetadata = metadataForOnlySubscribedToFeeds()
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let encoder = PropertyListEncoder()
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encoder.outputFormat = .binary
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do {
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let data = try encoder.encode(feedMetadata)
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try data.write(to: fileURL)
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} catch let error as NSError {
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os_log(.error, log: log, "Save to disk failed: %@.", error.localizedDescription)
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}
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}
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}
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private extension FeedMetadataFile {
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func queueSaveToDiskIfNeeded() {
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saveQueue.add(self, #selector(saveToDiskIfNeeded))
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}
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@objc func saveToDiskIfNeeded() {
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if isDirty {
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isDirty = false
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save()
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}
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}
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private func metadataForOnlySubscribedToFeeds() -> Account.FeedMetadataDictionary {
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let feedIDs = account.idToFeedDictionary.keys
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return account.feedMetadata.filter { (_: String, metadata: FeedMetadata) -> Bool in
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return feedIDs.contains(metadata.feedID)
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}
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}
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}
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