Std.App.Cache.Found

type

This declaration introduces a public type.

What it does

What a lookup found.

Three answers rather than two, and that is the whole design. An interface

answering a value or nothing forces a caller to treat an expired entry as

an absent one — so when a much-read key expires, every request that wanted

it finds nothing and every one of them recomputes it at the same moment,

against whatever the cache was protecting. Told the entry is stale, a

caller hands back the old answer and refreshes once.

Read the signature

• This declaration has no value signature because it introduces a type or trait.