AIKKEY_WPFWin7/AIK.Service/IService/IFileCacheService.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Media.Imaging;

namespace AIK.Service.IService
{
    public interface IFileCacheService
    {
        /// <summary>
        /// 异步获取文件。优先从缓存中获取，若不存在或已过期则从网络下载。
        /// </summary>
        /// <param name="fileUrl">第三方文件地址</param>
        /// <param name="cacheKey">自定义缓存键（可选）</param>
        /// <returns>缓存的文件数据</returns>
        Task<byte[]> GetFileByteAsync(string fileUrl, string cacheKey = null, CancellationToken cancellationToken = default);

        /// <summary>
        /// 带进度的文件下载方法。优先从缓存中获取，若不存在或已过期则从网络下载。
        /// </summary>
        /// <param name="fileUrl"></param>
        /// <param name="cacheKey"></param>
        /// <param name="progress"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        Task<(bool success, string localFilePath)> DownloadFileWithProgressAsync(string fileUrl, string cacheKey, IProgress<double> progress = null, CancellationToken cancellationToken = default);

        /// <summary>
        /// 清除所有过期的缓存文件。(bin文件默认无过期期限)
        /// </summary>
        Task ClearExpiredCacheAsync();

        /// <summary>
        /// 强制清除所有缓存（内存和磁盘）。
        /// </summary>
        Task ClearAllCacheAsync();
    }
}