49755ef0
 李曜臣
6-12代码优化
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using Microsoft.Extensions.Caching.Distributed;
using Volo.Abp.Caching;
namespace FoodLabeling.Application.Helpers;
/// <summary>
/// 平台「系统编辑」时间戳缓存项（任意业务写接口成功后更新，供 <c>my-menus</c> 的 <c>lastUpdated</c> 使用）。
/// </summary>
public class SystemEditStampCacheItem
{
public DateTime At { get; set; }
}
/// <summary>
/// 全局系统编辑时间戳缓存键（单实例，不按用户区分）。
/// </summary>
public class SystemEditStampCacheKey
{
public override string ToString() => "FoodLabeling:SystemEditStamp";
}
/// <summary>
/// 读写平台系统编辑时间戳。
/// </summary>
public static class SystemEditStampCacheHelper
{
private static readonly DistributedCacheEntryOptions DefaultOptions = new()
{
AbsoluteExpirationRelativeToNow = TimeSpan.FromDays(3650)
};
private static readonly SystemEditStampCacheKey GlobalKey = new();
public static async Task<DateTime?> GetAsync(
IDistributedCache<SystemEditStampCacheItem, SystemEditStampCacheKey> cache)
{
var item = await cache.GetAsync(GlobalKey);
return item?.At;
}
public static async Task TouchAsync(
IDistributedCache<SystemEditStampCacheItem, SystemEditStampCacheKey> cache)
{
await cache.SetAsync(
GlobalKey,
new SystemEditStampCacheItem { At = DateTime.Now },
DefaultOptions);
}
}
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