Struct Parameters 

pub struct Parameters { /* private fields */ }

The store behind a per-process cache. A read within ttl of the last read or write of the same key returns the remembered value; a write or reset through this handle refreshes it; another process’s write is seen once the entry ages out. Clones share the cache.

Implementations

impl Parameters

pub fn new(db: Db) -> Self

pub fn with_ttl(self, ttl: Duration) -> Self

The same store with another lifetime for cached reads.

pub fn db(&self) -> &Db

The connection the store writes through.

pub async fn get<T: DeserializeOwned>(&self, key: &str) -> CoreResult<Option<T>>

Reads a parameter as T, from the cache when fresh.

pub async fn get_or<T: DeserializeOwned>( &self, key: &str, default: T, ) -> CoreResult<T>

Reads a parameter, or default when unset.

pub async fn set<T: Serialize + ?Sized>( &self, key: &str, value: &T, ) -> CoreResult<()>

Writes a parameter and remembers it.

pub async fn reset(&self, key: &str) -> CoreResult<bool>

Removes a parameter and remembers its absence.

pub fn forget(&self, key: &str)

Drops one key from the cache, so the next read hits the table.

pub fn clear(&self)

Drops every cached entry.

Trait Implementations

impl Clone for Parameters

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Parameters

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

Formats the value using the given formatter.