Module `Tolk.Diskcache`

Simple file-based disk cache.

Stores marshalled OCaml values keyed by (table, key) pairs. Each entry is a separate file under the platform cache directory. Values are automatically invalidated when the cache version changes.

Uses Marshal for serialization and individual files per key.

val get : table:string -> key:string -> 'a option

get ~table ~key retrieves a cached value, or None if the key is absent or the cache file is corrupt/stale.

val put : table:string -> key:string -> 'a -> unit

put ~table ~key value stores value in the cache. Creates the cache directory if needed.

The entry is written to a temporary file and atomically renamed into place, so concurrent readers and writers of the same key always observe a complete entry (the previous one or the new one), never a torn write. Failures are silently ignored: the cache is best-effort.