     let cacheDatabaseManager: CacheDatabaseManager
 
     var mahjongFaceHistorys: [MahjongFaceItem] {
-        get {
-            return cacheDatabaseManager.mahjongFaceHistory()
-        }
-
-        set {
-            cacheDatabaseManager.set(mahjongFaceHistory: newValue)
-        }
+        get { return cacheDatabaseManager.mahjongFaceHistory() }
+        set { cacheDatabaseManager.set(mahjongFaceHistory: newValue) }
     }
 
     var formHash: String?

    private var topicListCachePageNumber = [String: Int]()
    private var workingRequests = [Request]()

    init(apiManager: DiscuzClient,
         networkManager: S1NetworkManager,
         databaseManager: DatabaseManager,
         cacheDatabaseManager: CacheDatabaseManager) {

        self.apiManager = apiManager
        self.networkManager = networkManager
        tracer = S1YapDatabaseAdapter(database: databaseManager)

import WebKit
import Alamofire

class DataCenter: NSObject {
    let apiManager: DiscuzClient
    let networkManager: S1NetworkManager
