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use anyhow::Result;

pub trait Cache {
    type Key;
    type Value;

    // return partial results when some keys are not found
    async fn mget(&self, keys: &[Self::Key]) -> Result<Vec<Self::Value>>;

    fn mset(
        &self,
        kvs: &[(Self::Key, Self::Value)],
    ) -> impl std::future::Future<Output = Result<()>> + std::marker::Send;
    // async fn mset(&self, kvs: &[(Self::Key, Self::Value)]) -> Result<()>;
    async fn mdel(&self, keys: &[Self::Key]) -> Result<()>;

    fn name(&self) -> &'static str;
}