Trait DataLoader

pub trait DataLoader {
    type Key;
    type Value;
    type Error;

    // Required methods
    fn load(
        &self,
        key: Self::Key,
    ) -> impl Future<Output = Result<Option<Self::Value>, Self::Error>>;
    fn load_many(
        &self,
        keys: impl IntoIterator<Item = Self::Key> + Send,
    ) -> impl Future<Output = Result<HashMap<Self::Key, Self::Value>, Self::Error>>;
}

Required Associated Types

type Key

type Value

type Error

Required Methods

fn load( &self, key: Self::Key, ) -> impl Future<Output = Result<Option<Self::Value>, Self::Error>>

fn load_many( &self, keys: impl IntoIterator<Item = Self::Key> + Send, ) -> impl Future<Output = Result<HashMap<Self::Key, Self::Value>, Self::Error>>

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.

Implementations on Foreign Types

impl<E> DataLoader for DataLoader<E>

where E: DataLoaderFetcher + Send + Sync + 'static,

type Error = ()

type Key = <E as DataLoaderFetcher>::Key

type Value = <E as DataLoaderFetcher>::Value

async fn load(&self, key: Self::Key) -> Result<Option<Self::Value>, Self::Error>

async fn load_many( &self, keys: impl IntoIterator<Item = Self::Key> + Send, ) -> Result<HashMap<Self::Key, Self::Value>, Self::Error>

Implementors