[feature request] add Cache::get_with_if(&self, key: &K, fallback: Fut, cond: Fn(&V) -> bool) -> V method

[ClSlaid]

I'm building a cache whose entries have their own standalone TTL. However moka supports global TTL and IDLE only. So I'm here to propose a new method Cache::get_with_if(&self, key: &K, fallback: Fut, cond: Fn(&V) -> bool) -> V

The function works like Cache::get_with(&self, key: &K, init: Fut) -> V, but when the key does not exist or cond(&V) is true, the init clojure will be called to initialize the value.

[tatsuya6502]

Thank you for proposing get_with_if method. I think it will be easy to implement. Let me work on it.

I'm building a cache whose entries have their own standalone TTL. However moka supports global TTL and IDLE only.

You are right. Per-entry expiration is on our roadmap but currently scheduled very late. (The item 10: "(post v1.0) feat: The variable (per-entry) expiration, using a hierarchical timer wheel") I will probably give it more priority. But anyway, I will implement get_with_if for now.

[tatsuya6502]

Hi @ClSlaid — I have published Moka v0.8.4 to crates.io with the get_with_if method. Thanks!