Persisted Cache for preheating on startup

[yuriy-yarosh]

What is the problem this feature would solve?

I'd like to be able to cache requests to 3rd party API's and have a persisted cache across multiple program runs - it could be just a file persisted on disk and restored for in-mem cache preheating. A complete external cache e.g. redis/memcache would deserve a standalone custom implementation, but for preheating support and small frequent requests (e.g. Github API calls, for instance), a persisted file backed one makes perfect sense.

What is the feature you are proposing to solve the problem?

It worth making the existing CacheImpl a bit more modular, so it would accept custom CacheState implementations (with custom initialState) with some form of optional persistence.

What alternatives have you considered?

Making a custom Persisted Cache from scratch.

It makes sense to Drop MutableHashMap out of cache state entirely and replace it with the respective get/set semantics for an external caching, in case of Redis/Memcached, but I'd leave it for in-mem store otherwise.

export interface CacheState<in out Key, in out Error, in out Value> {
  map: MutableHashMap.MutableHashMap<Key, MapValue<Key, Error, Value>> /

[mikearnaldi]

Did you check

effect/packages/experimental/src/RequestResolver.ts

Line 113 in 2e9bb98

export const persisted = dual<

?

[yuriy-yarosh]

@mikearnaldi nope, thanks.
This should work.

... should've asked at Discord instead