Enum LookupResponse

pub enum LookupResponse<K: LruKey + Clone + 'static, T: LruValue + 'static, E> {
    Invalid,
    Cached(CacheableEntry<K, T>),
    WaitPendingRequest(Receiver<CacheableEntry<K, T>>),
    Miss(JoinHandle<Result<CacheableEntry<K, T>, E>>),
}

lookup_with_request_dedup.await can directly return Result<CacheableEntry<K, T>, E>, but if we do not want to wait when cache hit does not happen, we can directly call lookup_with_request_dedup which will return a LookupResponse which contains Receiver<CacheableEntry<K, T>> or JoinHandle<Result<CacheableEntry<K, T>, E>> when cache hit does not happen.

Variants

Invalid

Cached(CacheableEntry<K, T>)

WaitPendingRequest(Receiver<CacheableEntry<K, T>>)

Miss(JoinHandle<Result<CacheableEntry<K, T>, E>>)

Trait Implementations

impl<K: LruKey + Clone + 'static, T: LruValue + 'static, E> Default for LookupResponse<K, T, E>

fn default() -> Self

Returns the “default value” for a type.

impl<K: LruKey + Clone + 'static, T: LruValue + 'static, E: From<RecvError>> Future for LookupResponse<K, T, E>

type Output = Result<CacheableEntry<K, T>, E>

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempts to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.