Trait TryGenCacheStore

pub trait TryGenCacheStore: TryCacheStore<Key = Self::Key, Value = Self::Value, Error = Self::Error> {
    type Key;
    type Value;
    type Error;
    type Args;

    // Required methods
    fn try_gen(
        &self,
        key: impl Borrow<<Self as TryGenCacheStore>::Key>,
        args: <Self as TryGenCacheStore>::Args,
    ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>;
    fn try_get_or_gen(
        &self,
        key: impl Borrow<<Self as TryGenCacheStore>::Key>,
        args: <Self as TryGenCacheStore>::Args,
    ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>;
    fn try_get_or_new(
        &mut self,
        key: impl Borrow<<Self as TryGenCacheStore>::Key>,
        args: <Self as TryGenCacheStore>::Args,
    ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>;
    fn try_gen_new(
        &mut self,
        key: impl Borrow<<Self as TryGenCacheStore>::Key>,
        args: <Self as TryGenCacheStore>::Args,
    ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>;
}

Fallible generative cache store.

Required Associated Types

type Key

type Value

type Error

type Args

Required Methods

fn try_gen( &self, key: impl Borrow<<Self as TryGenCacheStore>::Key>, args: <Self as TryGenCacheStore>::Args, ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>

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

fn try_get_or_gen( &self, key: impl Borrow<<Self as TryGenCacheStore>::Key>, args: <Self as TryGenCacheStore>::Args, ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>

Attempt to get the value from cache or generate a new one without adding it.

fn try_get_or_new( &mut self, key: impl Borrow<<Self as TryGenCacheStore>::Key>, args: <Self as TryGenCacheStore>::Args, ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>

Attempt to get the value from cache or generate a new one attempting to add it.

fn try_gen_new( &mut self, key: impl Borrow<<Self as TryGenCacheStore>::Key>, args: <Self as TryGenCacheStore>::Args, ) -> Result<<Self as TryGenCacheStore>::Value, <Self as TryCacheStore>::Error>

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

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<K, V, A, T: GenCacheStore<Key = K, Value = V, Args = A>> TryGenCacheStore for T

Implement TryGenCacheStore

type Key = K

type Value = V

type Error = Infallible

type Args = A

impl<K, V, E, A, FnErr: Into<E>, F: Fn(&K, A) -> Result<V, FnErr>, S: TryCacheStore<Key = K, Value = V, Error = E>> TryGenCacheStore for TryGenCacheStoreWrapper<K, V, E, A, FnErr, S, F>

Functions with multiple stages will return the same type of error without any way to detect at what point it failed, and not undoing the changes. If you don’t like this you’ll have to manually follow the steps done by the function and handle the errors yourself.

type Key = K

type Value = V

type Error = E

type Args = A