Trait QueryCapability 

pub trait QueryCapability:
    'static
    + Clone
    + PartialEq
    + Hash
    + Eq {
    type Ok;
    type Err;
    type Keys: Hash + PartialEq + Clone;

    // Required method
    fn run(
        &self,
        keys: &Self::Keys,
    ) -> impl Future<Output = Result<Self::Ok, Self::Err>>;

    // Provided method
    fn matches(&self, _keys: &Self::Keys) -> bool { ... }
}

Available on crate feature query only.

Required Associated Types

type Ok

type Err

type Keys: Hash + PartialEq + Clone

Required Methods

fn run( &self, keys: &Self::Keys, ) -> impl Future<Output = Result<Self::Ok, Self::Err>>

Query logic.

Provided Methods

fn matches(&self, _keys: &Self::Keys) -> bool

Implement a custom logic to check if this query should be invalidated or not given a QueryCapability::Keys.

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