content-hash-cache-pattern

You can cache file processing results using SHA-256 content hashes as cache keys instead of file paths. This approach ensures that moves or renames do not invalidate cache hits, keeping the cached results stable across file system changes.

Path-based caching fails because moving or renaming a file changes its path, causing cache misses even if the content is identical. Content-hash caching solves this by keying the cache with the file's SHA-256 hash, making it completely path-independent.

Auto-invalidation happens automatically when caching with content hashes. Because the cache key is the SHA-256 of the file contents, any modification changes the hash, ensuring the cache reads and writes only match unchanged file data.

Yes, it supports a service-layer separation by keeping file processing functions pure while the caching logic reads and writes from a separate file-based cache. It handles pipelines for PDF parsing, OCR, and image analysis tasks effectively.

The best way is using a content-hash cache pattern that keys results by SHA-256 hashes. It avoids redundant processing of unchanged files and automatically invalidates entries when content changes, optimizing expensive parsing operations.