KCD/EnhancementListItemDownloader.swift

   1 //
   2 //  EnhancementListItemDownloader.swift
   3 //  KCD
   4 //
   5 //  Created by Hori,Masaki on 2017/12/22.
   6 //  Copyright © 2017年 Hori,Masaki. All rights reserved.
   7 //
   8
   9 import Foundation
  10
  11 final class EnhancementListItemDownloader: NSObject, URLSessionDownloadDelegate {
  12
  13     private let resourceName: String
  14     private let resourceExtension: String
  15
  16     init(name: String, extension ext: String) {
  17
  18         self.resourceName = name
  19         self.resourceExtension = ext
  20
  21         super.init()
  22
  23         plistDownloadQueue = OperationQueue()
  24         plistDownloadQueue.name = "StrengthenListViewControllerPlistDownloadQueue"
  25         plistDownloadQueue.maxConcurrentOperationCount = 1
  26         plistDownloadQueue.qualityOfService = .background
  27
  28         let configuration = URLSessionConfiguration.default
  29
  30         plistDownloadSession = URLSession(configuration: configuration,
  31                                           delegate: self,
  32                                           delegateQueue: plistDownloadQueue)
  33     }
  34
  35     private var plistDownloadSession: URLSession!
  36     private var plistDownloadQueue: OperationQueue!
  37     private var plistDownloadTask: URLSessionDownloadTask?
  38     private var finishOperation: (([EnhancementListItem]) -> Void)?
  39
  40     func download(completeHandler: @escaping ([EnhancementListItem]) -> Void) {
  41
  42         if let _ = plistDownloadTask {
  43
  44             return
  45         }
  46
  47         guard let plistURL = URL(string: "https://osdn.net/projects/kcd/scm/git/KCD/blobs/master/KCD/\(resourceName).\(resourceExtension)?export=raw") else {
  48
  49             return
  50         }
  51
  52         finishOperation = completeHandler
  53         plistDownloadTask = plistDownloadSession.downloadTask(with: plistURL)
  54         plistDownloadTask?.resume()
  55     }
  56
  57     func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
  58
  59         plistDownloadTask = nil
  60
  61         guard let data = try? Data(contentsOf: location, options: []) else {
  62
  63             return
  64         }
  65         guard let list = NSKeyedUnarchiver.unarchiveObject(with: data as Data) as? [EnhancementListItem] else {
  66
  67             return
  68         }
  69
  70         finishOperation?(list)
  71     }
  72
  73     func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
  74
  75         if let error = error {
  76
  77             Logger.shared.log(error.localizedDescription)
  78         }
  79         plistDownloadTask = nil
  80     }
  81 }