/// <summary>
/// 获得文件Byte数组
/// </summary>
/// <param name="filePath">文件路径</param>
/// <param name="ifModifiedSince"></param>
/// <returns></returns>
protected virtual async Task <(FileCacheModel fileCacheModel, bool isCache)> GetFileBytesAsync(string filePath, ICharSequence ifModifiedSince)
{
while (_readingFiles.Any(m => m.Key.Equals(filePath)))
{
await Task.Delay(1000);
}
if (ifModifiedSince != null)
{
return(await GetFileBytesFromCacheAsync(filePath, ifModifiedSince));
}
FileCacheModel fileCacheModel = await GetFileBytesFromFileAsync(filePath);
return(fileCacheModel, false);
}
/// <summary>
/// 从文件获取
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
protected virtual async Task <FileCacheModel> GetFileBytesFromFileAsync(string filePath)
{
_cacheManager.Remove($"{_cacheKey}{filePath}");
if (!File.Exists(filePath))
{
throw new DotNettyServerException("文件不存在");
}
_readingFiles.TryAdd(filePath, null);
var fileCacheModel = new FileCacheModel
{
CacheTime = DateTime.Now,
Body = await File.ReadAllBytesAsync(filePath)
};
_cacheManager.SetByAbsolute($"{_cacheKey}{filePath}", fileCacheModel, CacheSecond, DateTimeTypeEnum.Second);
_readingFiles.Remove(filePath, out _);
return(fileCacheModel);
}