     }
 }
 
-// MARK: Helpers
+// MARK: - Helpers
 
 extension DataCache {
     

    }
    
    
    // MARK: Read & write utils
    
    
    /// Write an object for key. This object must inherit from `NSObject` and implement `NSCoding` protocol. `String`, `Array`, `Dictionary` conform to this method.

    static let ioQueuePrefix = "com.nch.queue."
    static let defaultMaxCachePeriodInSecond: TimeInterval = 60 * 60 * 24 * 7         // a week
    
    public static let instance = DataCache(name: "default")
    
    let cachePath: String
    
    let memCache = NSCache<AnyObject, AnyObject>()
    let ioQueue: DispatchQueue
