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Added complete image caching solution to the demo app
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| // | ||
| // ImageCache.swift | ||
| // | ||
| // Created by Hovik Melikyan on 28.06.24. | ||
| // | ||
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| import SwiftUI | ||
| import AsyncMux | ||
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| private let capacity = 20 | ||
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| final class ImageCache { | ||
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| static func request(_ url: URL) async throws -> Image { | ||
| if let image = loadFromMemory(url) { | ||
| return image | ||
| } | ||
| let image = try await Self.requestRemote(url) | ||
| storeToMemory(url: url, image: image) | ||
| return image | ||
| } | ||
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| static func loadFromMemory(_ url: URL) -> Image? { | ||
| semaphore.wait() | ||
| defer { semaphore.signal() } | ||
| return memCache.touch(key: url) | ||
| } | ||
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| static func clear() { | ||
| semaphore.wait() | ||
| defer { semaphore.signal() } | ||
| memCache.removeAll() | ||
| } | ||
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| // MARK: - Private part | ||
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| private static func storeToMemory(url: URL, image: Image) { | ||
| semaphore.wait() | ||
| defer { semaphore.signal() } | ||
| memCache.set(image, forKey: url) | ||
| } | ||
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| @AsyncMedia | ||
| private static func requestRemote(_ url: URL) async throws -> Image { | ||
| let localURL = try await AsyncMedia.shared.request(url: url) | ||
| guard let uiImage = UIImage(contentsOfFile: localURL.path) else { | ||
| try? FileManager.default.removeItem(at: localURL) // reove the damaged file | ||
| throw AppError(code: "cached_file_damaged", message: "Internal: cached file damaged") | ||
| } | ||
| return Image(uiImage: uiImage) | ||
| } | ||
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| nonisolated(unsafe) | ||
| private static var memCache = LRUCache<URL, Image>(capacity: capacity) | ||
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| private static let semaphore = DispatchSemaphore(value: 1) | ||
| } |
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