Struct SettingsCache 

pub struct SettingsCache {
    repo: Arc<dyn SettingsRepository>,
    snapshot: RwLock<Option<(Arc<Settings>, Instant)>>,
    ttl: Duration,
}

A settings snapshot refreshed at most once per TTL window.

Fields

repo: Arc<dyn SettingsRepository>

snapshot: RwLock<Option<(Arc<Settings>, Instant)>>

The current snapshot and the instant it expires. None until the first successful load.

ttl: Duration

Implementations

impl SettingsCache

pub fn new(repo: Arc<dyn SettingsRepository>) -> Self

Wrap a repository with the default TTL.

pub fn with_ttl(repo: Arc<dyn SettingsRepository>, ttl: Duration) -> Self

Wrap a repository with an explicit TTL.

pub async fn get(&self) -> Arc<Settings>

Get the current settings, refreshing if the snapshot has expired.

Never fails: see the module docs for what happens when the repository errors.

Trait Implementations

impl Debug for SettingsCache

Hand-written because SettingsRepository is not Debug; the repository is elided rather than dropping the impl, which AppState needs.

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.