NetNewsWire/Frameworks/Account/AccountMetadataFile.swift

92 lines
2.2 KiB
Swift

//
// AccountMetadataFile.swift
// Account
//
// Created by Maurice Parker on 9/13/19.
// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import os.log
import RSCore
final class AccountMetadataFile {
private var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "accountMetadataFile")
private let fileURL: URL
private let account: Account
private var isDirty = false {
didSet {
queueSaveToDiskIfNeeded()
}
}
private let saveQueue = CoalescingQueue(name: "Save Queue", interval: 0.5)
init(filename: String, account: Account) {
self.fileURL = URL(fileURLWithPath: filename)
self.account = account
}
func markAsDirty() {
isDirty = true
}
func load() {
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator()
fileCoordinator.coordinate(readingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { readURL in
if let fileData = try? Data(contentsOf: readURL) {
let decoder = PropertyListDecoder()
account.metadata = (try? decoder.decode(AccountMetadata.self, from: fileData)) ?? AccountMetadata()
}
account.metadata.delegate = account
})
if let error = errorPointer?.pointee {
os_log(.error, log: log, "Read from disk coordination failed: %@.", error.localizedDescription)
}
}
func save() {
guard !account.isDeleted else { return }
let encoder = PropertyListEncoder()
encoder.outputFormat = .binary
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator()
fileCoordinator.coordinate(writingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { writeURL in
do {
let data = try encoder.encode(account.metadata)
try data.write(to: writeURL)
} catch let error as NSError {
os_log(.error, log: log, "Save to disk failed: %@.", error.localizedDescription)
}
})
if let error = errorPointer?.pointee {
os_log(.error, log: log, "Save to disk coordination failed: %@.", error.localizedDescription)
}
}
}
private extension AccountMetadataFile {
func queueSaveToDiskIfNeeded() {
saveQueue.add(self, #selector(saveToDiskIfNeeded))
}
@objc func saveToDiskIfNeeded() {
if isDirty {
isDirty = false
save()
}
}
}