esphynox

public class AsyncOperation: Operation {
    @objc enum State: Int {
        case ready
        case executing
        case finished
    }
    
    private let stateQueue = DispatchQueue(label: "\(Bundle.main.bundleIdentifier!).AsyncOperation.state", attributes: .concurrent)
    private var _state: State = .ready

esphynox

import Foundation

protocol Item: Codable {
    static var type: ItemType { get }
    
    var commonProtocolString: String { get }
}

enum ItemType: String, Codable {