content-hash-cache-pattern

Cache file processing results based on content by using SHA-256 hashes as cache keys. This method creates a content-addressable cache that remains valid even if files are renamed or moved across different paths.

File caches become invalid after renaming because they typically rely on file paths. Using SHA-256 content hashing for cache keys ensures identical file contents are recognized regardless of their path or filename.

Automatically invalidate a cache when file content changes by computing a SHA-256 hash of the content as the cache key. Any modification alters the hash, ensuring stale results are never retrieved.

Avoid redundant computations when batch processing PDF files by implementing a content-addressable cache. This prevents re-parsing identical documents by checking their SHA-256 hashes first.

You can separate caching logic from pure file processing functions by using a service layer separation approach. This adheres to the Single Responsibility Principle while managing SHA-256 cache operations independently.

Use content hashing for memoization instead of path-based caching when files might be renamed, moved, or duplicated across directories. SHA-256 hashing ensures path-independent, auto-invalidating cache entries.