Struct Cache 

pub struct Cache<S, Req, K, Resp> { /* private fields */ }

A Tower Service that caches responses.

This service wraps an inner service and caches successful responses. When a request comes in, the cache checks if a valid cached response exists. If so, it returns the cached value immediately without calling the inner service.

Responses must implement Clone to be cacheable.

Implementations

impl<S, Req, K, Resp> Cache<S, Req, K, Resp>

where K: Hash + Eq, Resp: Clone,

pub fn new(inner: S, config: Arc<CacheConfig<Req, K>>) -> Self

Creates a new Cache wrapping the given service.

Trait Implementations

impl<S, Req, K, Resp> Clone for Cache<S, Req, K, Resp>

where S: Clone,

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<S, Req, K> Service<Req> for Cache<S, Req, K, S::Response>

where S: Service<Req>, S::Response: Clone + Send + 'static, K: Hash + Eq + Clone + Send + 'static, Req: Send + 'static, S::Future: Send + 'static,

type Response = <S as Service<Req>>::Response

Responses given by the service.

type Error = CacheError<<S as Service<Req>>::Error>

Errors produced by the service.

type Future = Pin<Box<dyn Future<Output = Result<<Cache<S, Req, K, <S as Service<Req>>::Response> as Service<Req>>::Response, <Cache<S, Req, K, <S as Service<Req>>::Response> as Service<Req>>::Error>> + Send>>

The future response value.

fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, req: Req) -> Self::Future

Process the request and return the response asynchronously.