Individual skill
content-hash-cache-pattern
使用 SHA-256 内容哈希缓存高昂的文件处理结果 —— 与路径无关、自动失效且服务层分离。
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# 内容哈希文件缓存模式 (Content-Hash File Cache Pattern)
使用 SHA-256 内容哈希（而非文件路径）作为缓存键，缓存高昂的文件处理结果（如 PDF 解析、文本提取、图像分析）。与基于路径的缓存不同，这种方法在文件移动/重命名后依然有效，并在内容变化时自动失效。
## 何时激活
- 构建文件处理流水线（Pipeline），如 PDF、图像或文本提取
- 处理成本高昂且需要重复处理相同文件
- 需要提供 `--cache/--no-cache` 命令行选项
- 希望在不修改现有纯函数（Pure Functions）的情况下为其添加缓存功能
## 核心模式
### 1. 基于内容哈希的缓存键