ImageCache+Get.swift

extension ImageCache {
    func image(for url: URL) -> UIImage? {
        lock.lock(); defer { lock.unlock() }
        // the best case scenario -> there is a decoded image
        if let decodedImage = decodedImageCache.object(forKey: url as AnyObject) as? UIImage {
            return decodedImage
        }
        // search for image data
        if let image = imageCache.object(forKey: url as AnyObject) as? UIImage {
            let decodedImage = image.decodedImage()
            decodedImageCache.setObject(image as AnyObject, forKey: url as AnyObject, cost: decodedImage.diskSize)
            return decodedImage
        }
        return nil
    }
}