ttl_cache

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This avoids RUSTSEC-2020-0026 in linked-hash-map for `-Z minimal-versions` builds. https://rustsec.org/advisories/RUSTSEC-2020-0026

mathstuf

How do I freshen the TTL of already inserted entry?

3

How do I prevent actively used TtlCache entry from being expired and run its `Drop::drop`? --- Update: looks like `remove` + `insert` works. Maybe explicit `cache.refresh(&key)` would be more readable?

vi

As per title, `hashlink`: https://crates.io/crates/hashlink I can give it a try in a PR if you want.

lerouxrgd

TtlCache and testing

3

As far as I undestand, TtlCache use `std::time::{Duration, Instant}` without any indirection layer. This makes it trickier to [unit-]test the code without waiting. Shall there be some additional testing version...

vi

Why `remove_expired` is not a public function?

5

`let _ = the_cache.iter()` is obvious workaround, but less readable and maintainable. Removing expired elements can be significant if their destructors do something, so that function may be called periodically...

vi

Support a TtlCacheSet

5

Sometimes just existence is necessary, so a `TtlCacheSet` would be a nice addition.

mathstuf