Struct GenCacheStoreWrapper

pub struct GenCacheStoreWrapper<K, V, A, S: CacheStore<Key = K, Value = V>, F: Fn(&K, A) -> V> {
    pub store: S,
    pub generator: F,
    /* private fields */
}

Infallible generative cache store wrapper around a CacheStore and a generator function.

Generics:

• K: Type of the key used for cache indexing.
• V: Type of the value stored in the cache store.
• A: Type of additional arguments of the generator function.
• S: CacheStore which this wraps around.
• F: Fn<&K, A> with V return generator function.

Fields

store: S

generator: F

Implementations

impl<K, V, A, F: Fn(&K, A) -> V, S: CacheStore<Key = K, Value = V>> GenCacheStoreWrapper<K, V, A, S, F>

Default implementation

pub fn new(store: S, generator: F) -> Self

Make a new GenCacheStoreWrapper from a infallible store and a generator function.

Trait Implementations

impl<K, V, A, S, F: Fn(&K, A) -> V> CacheStore for GenCacheStoreWrapper<K, V, A, S, F>

where S: CacheStore + CacheStore<Key = K, Value = V>,

type Key = <S as CacheStore>::Key

type Value = <S as CacheStore>::Value

fn get(&self, key: impl Borrow<Self::Key>) -> Option<Self::Value>

Returns an option of the owned cache element if present

fn set(&mut self, key: impl Borrow<Self::Key>, value: impl Borrow<Self::Value>)

Sets a value given its key

fn exists(&self, key: impl Borrow<Self::Key>) -> bool

Checks if the cache entry exists

impl<K, V, A, S: CacheStore<Key = K, Value = V>, F: Fn(&K, A) -> V> GenCacheStore for GenCacheStoreWrapper<K, V, A, S, F>

Implement GenCacheStore

type Key = K

type Value = V

type Args = A

fn gen(&self, key: impl Borrow<K>, args: A) -> V

Generate a new value without checking cache or adding the value to it.

fn get_or_gen(&self, key: impl Borrow<K>, args: A) -> V

Get the value from cache or generate a new one without adding it.

fn get_or_new(&mut self, key: impl Borrow<K>, args: A) -> V

Get the value from cache or generate a new one adding it.

fn gen_new(&mut self, key: impl Borrow<K>, args: A) -> V

Generate a new value without checking cache and add the value to it, possibly overwriting previous values.