Trait tower::discover::Discover

pub trait Discover {
    type Key: Eq + Hash;
    type Service;
    type Error;
    fn poll_discover(
        self: Pin<&mut Self>, 
        cx: &mut Context
    ) -> Poll<Result<Change<Self::Key, Self::Service>, Self::Error>>;
}

Provide a uniform set of services able to satisfy a request.

This set of services may be updated over time. On each change to the set, a new NewServiceSet is yielded by Discover.

See crate documentation for more details.

Associated Types

type Key: Eq + Hash

NewService key

type Service

The type of Service yielded by this Discover.

type Error

Error produced during discovery

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Required methods

fn poll_discover(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<Change<Self::Key, Self::Service>, Self::Error>>

Yields the next discovery change set.

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Implementations on Foreign Types

impl<P> Discover for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Discover, 

type Key = <<P as Deref>::Target as Discover>::Key

type Service = <<P as Deref>::Target as Discover>::Service

type Error = <<P as Deref>::Target as Discover>::Error

fn poll_discover(
    self: Pin<&mut Pin<P>>,
    cx: &mut Context
) -> Poll<Result<Change<<Pin<P> as Discover>::Key, <Pin<P> as Discover>::Service>, <Pin<P> as Discover>::Error>>

impl<'_, D> Discover for &'_ mut D where
    D: Discover + Unpin + ?Sized, 

type Key = <D as Discover>::Key

type Service = <D as Discover>::Service

type Error = <D as Discover>::Error

fn poll_discover(
    self: Pin<&mut &'_ mut D>,
    cx: &mut Context
) -> Poll<Result<Change<<&'_ mut D as Discover>::Key, <&'_ mut D as Discover>::Service>, <&'_ mut D as Discover>::Error>>

impl<D> Discover for Box<D> where
    D: Discover + Unpin + ?Sized, 

type Key = <D as Discover>::Key

type Service = <D as Discover>::Service

type Error = <D as Discover>::Error

fn poll_discover(
    self: Pin<&mut Box<D>>,
    cx: &mut Context
) -> Poll<Result<Change<<Box<D> as Discover>::Key, <Box<D> as Discover>::Service>, <Box<D> as Discover>::Error>>

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Implementors

impl<S, K, Svc> Discover for ServiceStream<S> where
    K: Hash + Eq,
    S: TryStream<Ok = Change<K, Svc>>, 

type Key = K

type Service = Svc

type Error = <S as TryStream>::Error

fn poll_discover(
    self: Pin<&mut ServiceStream<S>>,
    cx: &mut Context
) -> Poll<Result<Change<<ServiceStream<S> as Discover>::Key, <ServiceStream<S> as Discover>::Service>, <ServiceStream<S> as Discover>::Error>>

impl<T, U> Discover for ServiceList<T> where
    T: IntoIterator<Item = U>, 

type Key = usize

type Service = U

type Error = Never

fn poll_discover(
    self: Pin<&mut ServiceList<T>>,
    &mut Context
) -> Poll<Result<Change<<ServiceList<T> as Discover>::Key, <ServiceList<T> as Discover>::Service>, <ServiceList<T> as Discover>::Error>>

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