Struct Constant

pub struct Constant<T, M> { /* private fields */ }

Wraps a type so that it implements Load and returns a constant load metric.

This load estimator is primarily useful for testing.

Implementations

impl<T, M: Copy> Constant<T, M>

const fn new(inner: T, load: M) -> Self

Wraps a T-typed service with a constant M-typed load metric.

Trait Implementations

impl<'__pin, T, M> Unpin for Constant<T, M> where PinnedFieldsOf<__Origin<'__pin, T, M>>: Unpin,

impl<D: Discover + Unpin, M: Copy> Stream for Constant<D, M>

type Item = Result<Change<<D as Discover>::Key, Constant<<D as Discover>::Service, M>>, <D as Discover>::Error>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>

Yields the next discovery change set.

impl<S, M, Request> Service<Request> for Constant<S, M> where S: Service<Request>, M: Copy,

type Response = <S as Service<Request>>::Response;
type Error = <S as Service<Request>>::Error;
type Future = <S as Service<Request>>::Future;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>
fn call(&mut self, req: Request) -> Self::Future

impl<T, M: Copy + PartialOrd> Load for Constant<T, M>

type Metric = M;
fn load(&self) -> M

impl<T: Debug, M: Debug> Debug for Constant<T, M>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Auto Trait Implementations

impl<T, M> Freeze for Constant<T, M> where T: Freeze, M: Freeze,

impl<T, M> RefUnwindSafe for Constant<T, M> where T: RefUnwindSafe, M: RefUnwindSafe,

impl<T, M> Send for Constant<T, M> where T: Send, M: Send,

impl<T, M> Sync for Constant<T, M> where T: Sync, M: Sync,

impl<T, M> UnsafeUnpin for Constant<T, M> where T: UnsafeUnpin, M: UnsafeUnpin,

impl<T, M> UnwindSafe for Constant<T, M> where T: UnwindSafe, M: UnwindSafe,

Blanket Implementations

impl<C, Target> MakeConnection<Target> for Constant<T, M> where C: Service<Target>, <C as Service<Target>>::Response: AsyncRead + AsyncWrite,

type Connection = <C as Service<Target>>::Response;
type Error = <C as Service<Target>>::Error;
type Future = <C as Service<Target>>::Future;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), <C as MakeConnection<Target>>::Error>>
fn make_connection(&mut self, target: Target) -> <C as MakeConnection<Target>>::Future

impl<K, S, E, D> Discover for Constant<T, M> where D: TryStream<Ok = Change<K, S>, Error = E> + ?Sized, K: Eq,

type Key = K;
type Service = S;
type Error = E;
fn poll_discover(self: Pin<&mut D>, cx: &mut Context<'_>) -> Poll<Option<Result<<D as TryStream>::Ok, <D as TryStream>::Error>>>

impl<M, S, Target, Request> MakeService<Target, Request> for Constant<T, M> where M: Service<Target, Response = S>, S: Service<Request>,

type Response = <S as Service<Request>>::Response;
type Error = <S as Service<Request>>::Error;
type Service = S;
type MakeError = <M as Service<Target>>::Error;
type Future = <M as Service<Target>>::Future;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), <M as MakeService<Target, Request>>::MakeError>>
fn make_service(&mut self, target: Target) -> <M as MakeService<Target, Request>>::Future

impl<S> TryStreamExt for Constant<T, M> where S: TryStream + ?Sized,

impl<S, T, E> TryStream for Constant<T, M> where S: Stream<Item = Result<T, E>> + ?Sized,

type Ok = T;
type Error = E;
fn try_poll_next(self: Pin<&mut S>, cx: &mut Context<'_>) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

impl<T> Any for Constant<T, M> where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Constant<T, M> where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Constant<T, M> where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for Constant<T, M>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for Constant<T, M>

impl<T> StreamExt for Constant<T, M> where T: Stream + ?Sized,

impl<T> WithSubscriber for Constant<T, M>

impl<T, Request> ServiceExt<Request> for Constant<T, M> where T: Service<Request> + ?Sized,

impl<T, U> Into<U> for Constant<T, M> where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

impl<T, U> TryFrom<U> for Constant<T, M> where U: Into<T>,

type Error = never;
fn try_from(value: U) -> Result<T, never>

impl<T, U> TryInto<U> for Constant<T, M> where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error;
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>