46 lines
1.8 KiB
C#
46 lines
1.8 KiB
C#
using FreeSql.DataAnnotations;
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using System.Text.Json;
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namespace Store.Modules.CloudProduct.Entities;
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/// <summary>跨用户复用的图片识别数据，仅存储成功识别结果。</summary>
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[Table(Name = "image_analysis_cache")]
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public sealed class ImageAnalysisCache
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{
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/// <summary>客户端指定的 MD5 缓存键，统一保存为 32 位小写十六进制。</summary>
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[Column(IsPrimary = true, StringLength = 32)]
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public string CacheKey { get; set; } = "";
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/// <summary>模型识别结果的 JSON 字符串数组，空数组表示未识别到文字或品牌。</summary>
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[Column(DbType = "longtext")]
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public string RecognitionResult { get; set; } = "";
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/// <summary>缓存最近更新时间，UTC。</summary>
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public DateTime UpdatedAt { get; set; }
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/// <summary>从 UpdatedAt 起算的缓存有效小时数，命中时不续期。</summary>
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public int ExpiresAt { get; set; }
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/// <summary>每轮成功识别后更新有效期：空结果逐级延长，有内容则重置级别。</summary>
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public void RecordExpiration(bool isEmpty, DateTime utcNow)
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{
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// 新记录和上次有内容的记录，首次为空时均从 24 小时起算。
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ExpiresAt = isEmpty ? ExpiresAt switch
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{
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24 => 48,
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48 => 96,
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96 => 192,
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192 or 384 => 384,
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_ => 24
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} : 720;
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UpdatedAt = utcNow;
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}
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/// <summary>仅复用有效期内的数组，旧对象格式需要重新识别。</summary>
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public string[]? ReadFreshResult(DateTime utcNow)
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{
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if (utcNow >= UpdatedAt.AddHours(ExpiresAt) || !RecognitionResult.TrimStart().StartsWith('['))
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return null;
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return JsonSerializer.Deserialize<string[]>(RecognitionResult);
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}
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}
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