Struct tower::load::Constant

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

Available on crate feature load only.

Expand description

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

This load estimator is primarily useful for testing.

Implementations

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

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

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

Trait Implementations

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

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

Formats the value using the given formatter. Read more

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

type Metric = M

A comparable load metric. Read more

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fn load(&self) -> M

Estimate the service’s current load.

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

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

Responses given by the service.

type Error = <S as Service<Request>>::Error

Errors produced by the service.

type Future = <S as Service<Request>>::Future

The future response value.

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

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

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

Process the request and return the response asynchronously. Read more

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

Available on crate feature discover only.

Proxies Discover such that all changes are wrapped with a constant load.

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fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>

Yields the next discovery change set.

type Item = Result<Change<<D as Discover>::Key, Constant<<D as Discover>::Service, M>>, <D as Discover>::Error>

Values yielded by the stream.

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fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more

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impl<'pin, T, M> Unpin for Constant<T, M> where
Origin<'__pin, T, M>: Unpin,

Auto Trait Implementations

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

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

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

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

Blanket Implementations

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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

type Key = K

Available on crate feature discover only.

A unique identifier for each active service. Read more

type Service = S

Available on crate feature discover only.

The type of Service yielded by this Discover. Read more

type Error = E

Available on crate feature discover only.

Error produced during discovery

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fn poll_discover(
self: Pin<&mut D>,
cx: &mut Context<'_>
) -> Poll<Option<Result<<D as TryStream>::Ok, <D as TryStream>::Error>>>

Available on crate feature discover only.

Yields the next discovery change set.

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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

const: unstable · source

fn into(self) -> U

Calls U::from(self).

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

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

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fn ready(&mut self) -> Ready<'_, Self, Request>ⓘNotable traits for Ready<'a, T, Request>`impl<'a, T, Request> Future for Ready<'a, T, Request> where T: Service<Request>, type Output = Result<&'a mut T, T::Error>;` where
Self: Sized,

Available on crate feature util only.

Yields a mutable reference to the service when it is ready to accept a request.

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fn ready_and(&mut self) -> ReadyAnd<'_, Self, Request> where
Self: Sized,

👎 Deprecated since 0.4.6:

please use the ServiceExt::ready method instead

Available on crate feature util only.

Yields a mutable reference to the service when it is ready to accept a request.

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fn ready_oneshot(self) -> ReadyOneshot<Self, Request>ⓘNotable traits for ReadyOneshot<T, Request>`impl<T, Request> Future for ReadyOneshot<T, Request> where T: Service<Request>, type Output = Result<T, T::Error>;` where
Self: Sized,

Available on crate feature util only.

Yields the service when it is ready to accept a request.

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fn oneshot(self, req: Request) -> Oneshot<Self, Request>ⓘNotable traits for Oneshot<S, Req>`impl<S, Req> Future for Oneshot<S, Req> where S: Service<Req>, type Output = Result<S::Response, S::Error>;` where
Self: Sized,

Available on crate feature util only.

Consume this Service, calling with the providing request once it is ready.

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fn call_all<S>(self, reqs: S) -> CallAll<Self, S> where
 Self: Sized,
 Self::Error: Into<BoxError>,
 S: Stream<Item = Request>,

Available on crate feature util only.

Process all requests from the given Stream, and produce a Stream of their responses. Read more

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fn and_then<F>(self, f: F) -> AndThen<Self, F> where
Self: Sized,
F: Clone,

Available on crate feature util only.

Executes a new future after this service’s future resolves. This does not alter the behaviour of the poll_ready method. Read more

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fn map_response<F, Response>(self, f: F) -> MapResponse<Self, F> where
Self: Sized,
F: FnOnce(Self::Response) -> Response + Clone,

Available on crate feature util only.

Maps this service’s response value to a different value. This does not alter the behaviour of the poll_ready method. Read more

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fn map_err<F, Error>(self, f: F) -> MapErr<Self, F> where
Self: Sized,
F: FnOnce(Self::Error) -> Error + Clone,

Available on crate feature util only.

Maps this service’s error value to a different value. This does not alter the behaviour of the poll_ready method. Read more

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fn map_result<F, Response, Error>(self, f: F) -> MapResult<Self, F> where
 Self: Sized,
 Error: From<Self::Error>,
 F: FnOnce(Result<Self::Response, Self::Error>) -> Result<Response, Error> + Clone,

Available on crate feature util only.

Maps this service’s result type (Result<Self::Response, Self::Error>) to a different value, regardless of whether the future succeeds or fails. Read more

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fn map_request<F, NewRequest>(self, f: F) -> MapRequest<Self, F> where
Self: Sized,
F: FnMut(NewRequest) -> Request,

Available on crate feature util only.

Composes a function in front of the service. Read more

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fn filter<F, NewRequest>(self, filter: F) -> Filter<Self, F> where
Self: Sized,
F: Predicate<NewRequest>,

Available on crate features util and filter only.

Composes this service with a Filter that conditionally accepts or rejects requests based on a predicate. Read more

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fn filter_async<F, NewRequest>(self, filter: F) -> AsyncFilter<Self, F> where
Self: Sized,
F: AsyncPredicate<NewRequest>,

Available on crate features util and filter only.

Composes this service with an AsyncFilter that conditionally accepts or rejects requests based on an [async predicate]. Read more

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fn then<F, Response, Error, Fut>(self, f: F) -> Then<Self, F> where
 Self: Sized,
 Error: From<Self::Error>,
 F: FnOnce(Result<Self::Response, Self::Error>) -> Fut + Clone,
 Fut: Future<Output = Result<Response, Error>>,

Available on crate feature util only.

Composes an asynchronous function after this service. Read more

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fn map_future<F, Fut, Response, Error>(self, f: F) -> MapFuture<Self, F> where
 Self: Sized,
 F: FnMut(Self::Future) -> Fut,
 Error: From<Self::Error>,
 Fut: Future<Output = Result<Response, Error>>,

Available on crate feature util only.

Composes a function that transforms futures produced by the service. Read more

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fn boxed(self) -> BoxService<Request, Self::Response, Self::Error> where
Self: Sized + Send + 'static,
Self::Future: Send + 'static,

Available on crate feature util only.

Convert the service into a Service + Send trait object. Read more

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fn boxed_clone(self) -> BoxCloneService<Request, Self::Response, Self::Error> where
Self: Clone + Sized + Send + 'static,
Self::Future: Send + 'static,

Available on crate feature util only.

Convert the service into a Service + Clone + Send trait object. Read more

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

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fn next(&mut self) -> Next<'_, Self> where
Self: Unpin,

Creates a future that resolves to the next item in the stream. Read more

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fn into_future(self) -> StreamFuture<Self> where
Self: Unpin,

Converts this stream into a future of (next_item, tail_of_stream). If the stream terminates, then the next item is None. Read more

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fn map<T, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> T,

Maps this stream’s items to a different type, returning a new stream of the resulting type. Read more

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fn enumerate(self) -> Enumerate<Self>

Creates a stream which gives the current iteration count as well as the next value. Read more

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fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

Filters the values produced by this stream according to the provided asynchronous predicate. Read more

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fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,

Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more

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fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future,

Computes from this stream’s items new items of a different type using an asynchronous closure. Read more

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fn collect<C>(self) -> Collect<Self, C> where
C: Default + Extend<Self::Item>,

Transforms a stream into a collection, returning a future representing the result of that computation. Read more

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fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB> where
 FromA: Default + Extend<A>,
 FromB: Default + Extend,
 Self: Stream<Item = (A, B)>,

Converts a stream of pairs into a future, which resolves to pair of containers. Read more

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fn concat(self) -> Concat<Self> where
 Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
 Self::Item: IntoIterator,
 Self::Item: Default,

Concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more

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fn count(self) -> Count<Self>

Drives the stream to completion, counting the number of items. Read more

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fn cycle(self) -> Cycle<Self> where
Self: Clone,

Repeats a stream endlessly. Read more

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fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,

Execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more

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fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,

Execute predicate over asynchronous stream, and return true if any element in stream satisfied a predicate. Read more

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fn all<Fut, F>(self, f: F) -> All<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,

Execute predicate over asynchronous stream, and return true if all element in stream satisfied a predicate. Read more

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fn flatten(self) -> Flatten<Self> where
Self::Item: Stream,

Flattens a stream of streams into just one continuous stream. Read more

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fn flatten_unordered(
 self,
 limit: impl Into<Option<usize>>
) -> FlattenUnordered<Self> where
 Self::Item: Stream,
 Self::Item: Unpin,

Flattens a stream of streams into just one continuous stream. Polls inner streams concurrently. Read more

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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where
F: FnMut(Self::Item) -> U,
U: Stream,

Maps a stream like StreamExt::map but flattens nested Streams. Read more

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fn flat_map_unordered<U, F>(
 self,
 limit: impl Into<Option<usize>>,
 f: F
) -> FlatMapUnordered<Self, U, F> where
 U: Stream + Unpin,
 F: FnMut(Self::Item) -> U,

Maps a stream like StreamExt::map but flattens nested Streams and polls them concurrently, yielding items in any order, as they made available. Read more

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fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F> where
F: FnMut(&mut S, Self::Item) -> Fut,
Fut: Future<Output = Option>,

Combinator similar to StreamExt::fold that holds internal state and produces a new stream. Read more

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fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more

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fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

Take elements from this stream while the provided asynchronous predicate resolves to true. Read more

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fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut> where
Fut: Future,

Take elements from this stream until the provided future resolves. Read more

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fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more

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fn for_each_concurrent<Fut, F>(
 self,
 limit: impl Into<Option<usize>>,
 f: F
) -> ForEachConcurrent<Self, Fut, F> where
 F: FnMut(Self::Item) -> Fut,
 Fut: Future<Output = ()>,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available. Read more

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fn take(self, n: usize) -> Take<Self>

Creates a new stream of at most n items of the underlying stream. Read more

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fn skip(self, n: usize) -> Skip<Self>

Creates a new stream which skips n items of the underlying stream. Read more

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fn fuse(self) -> Fuse<Self>

Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more

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fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it. Read more

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fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,

Catches unwinding panics while polling the stream. Read more

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fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>> where
Self: 'a + Send,

Wrap the stream in a Box, pinning it. Read more

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fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>> where
Self: 'a,

Wrap the stream in a Box, pinning it. Read more

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fn buffered(self, n: usize) -> Buffered<Self> where
Self::Item: Future,

An adaptor for creating a buffered list of pending futures. Read more

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fn buffer_unordered(self, n: usize) -> BufferUnordered<Self> where
Self::Item: Future,

An adaptor for creating a buffered list of pending futures (unordered). Read more

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fn zip<St>(self, other: St) -> Zip<Self, St> where
St: Stream,

An adapter for zipping two streams together. Read more

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fn chain<St>(self, other: St) -> Chain<Self, St> where
St: Stream<Item = Self::Item>,

Adapter for chaining two streams. Read more

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fn peekable(self) -> Peekable<Self>

Creates a new stream which exposes a peek method. Read more

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fn chunks(self, capacity: usize) -> Chunks<Self>

An adaptor for chunking up items of the stream inside a vector. Read more

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fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>

An adaptor for chunking up ready items of the stream inside a vector. Read more

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fn forward<S>(self, sink: S) -> Forward<Self, S> where
S: Sink<Self::Ok, Error = Self::Error>,
Self: TryStream,

A future that completes after the given stream has been fully processed into the sink and the sink has been flushed and closed. Read more

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fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>) where
Self: Sink<Item>,

Splits this Stream + Sink object into separate Sink and Stream objects. Read more

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fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),

Do something with each item of this stream, afterwards passing it on. Read more

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fn left_stream(self) -> Either<Self, B> where
B: Stream<Item = Self::Item>,

Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more

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fn right_stream(self) -> Either<B, Self> where
B: Stream<Item = Self::Item>,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more

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fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> where
Self: Unpin,

A convenience method for calling Stream::poll_next on Unpin stream types. Read more

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fn select_next_some(&mut self) -> SelectNextSome<'_, Self> where
Self: Unpin + FusedStream,

Returns a Future that resolves when the next item in this stream is ready. Read more

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

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fn try_poll_next(
self: Pin<&mut S>,
cx: &mut Context<'_>
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

Poll this TryStream as if it were a Stream. Read more

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

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fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>,

Wraps the current stream in a new stream which converts the error type into the one provided. Read more

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fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnMut(Self::Ok) -> T,

Wraps the current stream in a new stream which maps the success value using the provided closure. Read more

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fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnMut(Self::Error) -> E,

Wraps the current stream in a new stream which maps the error value using the provided closure. Read more

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fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,

Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more

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fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnMut(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more

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fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnMut(&Self::Ok),

Do something with the success value of this stream, afterwards passing it on. Read more

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fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnMut(&Self::Error),

Do something with the error value of this stream, afterwards passing it on. Read more

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fn into_stream(self) -> IntoStream<Self>

Wraps a TryStream into a type that implements Stream Read more

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fn try_next(&mut self) -> TryNext<'_, Self> where
Self: Unpin,

Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more

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fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more

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fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more

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fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,

Take elements on this stream while the provided asynchronous predicate resolves to true. Read more

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fn try_for_each_concurrent<Fut, F>(
 self,
 limit: impl Into<Option<usize>>,
 f: F
) -> TryForEachConcurrent<Self, Fut, F> where
 F: FnMut(Self::Ok) -> Fut,
 Fut: Future<Output = Result<(), Self::Error>>,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more

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fn try_collect<C>(self) -> TryCollect<Self, C> where
C: Default + Extend<Self::Ok>,

Attempt to transform a stream into a collection, returning a future representing the result of that computation. Read more

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fn try_chunks(self, capacity: usize) -> TryChunks<Self>

An adaptor for chunking up successful items of the stream inside a vector. Read more

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fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F> where
Fut: Future<Output = bool>,
F: FnMut(&Self::Ok) -> Fut,

Attempt to filter the values produced by this stream according to the provided asynchronous closure. Read more

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fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F> where
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>,
F: FnMut(Self::Ok) -> Fut,

Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more

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fn try_flatten(self) -> TryFlatten<Self> where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error: From<Self::Error>,

Flattens a stream of streams into just one continuous stream. Read more

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fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F> where
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>,

Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more

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fn try_concat(self) -> TryConcat<Self> where
 Self::Ok: Extend<<Self::Ok as IntoIterator>::Item>,
 Self::Ok: IntoIterator,
 Self::Ok: Default,

Attempt to concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more

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fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,

Attempt to execute several futures from a stream concurrently (unordered). Read more

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fn try_buffered(self, n: usize) -> TryBuffered<Self> where
Self::Ok: TryFuture,
<Self::Ok as TryFuture>::Error == Self::Error,

Attempt to execute several futures from a stream concurrently. Read more

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fn try_poll_next_unpin(
 &mut self,
 cx: &mut Context<'_>
) -> Poll<Option<Result<Self::Ok, Self::Error>>> where
 Self: Unpin,

A convenience method for calling TryStream::try_poll_next on Unpin stream types. Read more

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fn into_async_read(self) -> IntoAsyncRead<Self> where
Self: TryStreamExt<Error = Error> + Unpin,
Self::Ok: AsRef<[u8]>,

Adapter that converts this stream into an AsyncRead. Read more

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

Struct tower::load::Constant

Implementations

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

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

Trait Implementations

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

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

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

type Metric = M

fn load(&self) -> M

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

fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>

type Item = Result<Change<<D as Discover>::Key, Constant<<D as Discover>::Service, M>>, <D as Discover>::Error>

fn size_hint(&self) -> (usize, Option<usize>)

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

Auto Trait Implementations

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

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

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

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

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<K, S, E, D> Discover for D 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<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

fn in_current_span(self) -> Instrumented<Self>

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

fn into(self) -> U

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

fn ready(&mut self) -> Ready<'_, Self, Request>ⓘNotable traits for Ready<'a, T, Request>impl<'a, T, Request> Future for Ready<'a, T, Request> where T: Service<Request>, type Output = Result<&'a mut T, T::Error>; where Self: Sized,

fn ready_and(&mut self) -> ReadyAnd<'_, Self, Request> where Self: Sized,

fn ready_oneshot(self) -> ReadyOneshot<Self, Request>ⓘNotable traits for ReadyOneshot<T, Request>impl<T, Request> Future for ReadyOneshot<T, Request> where T: Service<Request>, type Output = Result<T, T::Error>; where Self: Sized,

fn oneshot(self, req: Request) -> Oneshot<Self, Request>ⓘNotable traits for Oneshot<S, Req>impl<S, Req> Future for Oneshot<S, Req> where S: Service<Req>, type Output = Result<S::Response, S::Error>; where Self: Sized,

fn call_all<S>(self, reqs: S) -> CallAll<Self, S> where Self: Sized, Self::Error: Into<BoxError>, S: Stream<Item = Request>,

fn and_then<F>(self, f: F) -> AndThen<Self, F> where Self: Sized, F: Clone,

fn map_response<F, Response>(self, f: F) -> MapResponse<Self, F> where Self: Sized, F: FnOnce(Self::Response) -> Response + Clone,

fn map_err<F, Error>(self, f: F) -> MapErr<Self, F> where Self: Sized, F: FnOnce(Self::Error) -> Error + Clone,

fn map_result<F, Response, Error>(self, f: F) -> MapResult<Self, F> where Self: Sized, Error: From<Self::Error>, F: FnOnce(Result<Self::Response, Self::Error>) -> Result<Response, Error> + Clone,

fn map_request<F, NewRequest>(self, f: F) -> MapRequest<Self, F> where Self: Sized, F: FnMut(NewRequest) -> Request,

fn filter<F, NewRequest>(self, filter: F) -> Filter<Self, F> where Self: Sized, F: Predicate<NewRequest>,

fn filter_async<F, NewRequest>(self, filter: F) -> AsyncFilter<Self, F> where Self: Sized, F: AsyncPredicate<NewRequest>,

fn then<F, Response, Error, Fut>(self, f: F) -> Then<Self, F> where Self: Sized, Error: From<Self::Error>, F: FnOnce(Result<Self::Response, Self::Error>) -> Fut + Clone, Fut: Future<Output = Result<Response, Error>>,

fn map_future<F, Fut, Response, Error>(self, f: F) -> MapFuture<Self, F> where Self: Sized, F: FnMut(Self::Future) -> Fut, Error: From<Self::Error>, Fut: Future<Output = Result<Response, Error>>,

fn boxed(self) -> BoxService<Request, Self::Response, Self::Error> where Self: Sized + Send + 'static, Self::Future: Send + 'static,

fn boxed_clone(self) -> BoxCloneService<Request, Self::Response, Self::Error> where Self: Clone + Sized + Send + 'static, Self::Future: Send + 'static,

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

fn next(&mut self) -> Next<'_, Self> where Self: Unpin,

fn into_future(self) -> StreamFuture<Self> where Self: Unpin,

fn map<T, F>(self, f: F) -> Map<Self, F> where F: FnMut(Self::Item) -> T,

fn enumerate(self) -> Enumerate<Self>

fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>,

fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = Option<T>>,

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnMut(Self::Item) -> Fut, Fut: Future,

fn collect<C>(self) -> Collect<Self, C> where C: Default + Extend<Self::Item>,

fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB> where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Stream<Item = (A, B)>,

fn concat(self) -> Concat<Self> where Self::Item: Extend<<Self::Item as IntoIterator>::Item>, Self::Item: IntoIterator, Self::Item: Default,

fn count(self) -> Count<Self>

fn cycle(self) -> Cycle<Self> where Self: Clone,

fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where F: FnMut(T, Self::Item) -> Fut, Fut: Future<Output = T>,

fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F> where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>,

fn all<Fut, F>(self, f: F) -> All<Self, Fut, F> where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>,

fn flatten(self) -> Flatten<Self> where Self::Item: Stream,

fn flatten_unordered( self, limit: impl Into<Option<usize>>) -> FlattenUnordered<Self> where Self::Item: Stream, Self::Item: Unpin,

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

fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>

impl<'pin, T, M> Unpin for Constant<T, M> where
Origin<'__pin, T, M>: Unpin,

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

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

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

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

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

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

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

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

fn poll_discover(
self: Pin<&mut D>,
cx: &mut Context<'_>
) -> Poll<Option<Result<<D as TryStream>::Ok, <D as TryStream>::Error>>>

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

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

fn ready(&mut self) -> Ready<'_, Self, Request>ⓘNotable traits for Ready<'a, T, Request>`impl<'a, T, Request> Future for Ready<'a, T, Request> where T: Service<Request>, type Output = Result<&'a mut T, T::Error>;` where
Self: Sized,

fn ready_and(&mut self) -> ReadyAnd<'_, Self, Request> where
Self: Sized,

fn ready_oneshot(self) -> ReadyOneshot<Self, Request>ⓘNotable traits for ReadyOneshot<T, Request>`impl<T, Request> Future for ReadyOneshot<T, Request> where T: Service<Request>, type Output = Result<T, T::Error>;` where
Self: Sized,

fn oneshot(self, req: Request) -> Oneshot<Self, Request>ⓘNotable traits for Oneshot<S, Req>`impl<S, Req> Future for Oneshot<S, Req> where S: Service<Req>, type Output = Result<S::Response, S::Error>;` where
Self: Sized,

fn call_all<S>(self, reqs: S) -> CallAll<Self, S> where
Self: Sized,
Self::Error: Into<BoxError>,
S: Stream<Item = Request>,

fn and_then<F>(self, f: F) -> AndThen<Self, F> where
Self: Sized,
F: Clone,

fn map_response<F, Response>(self, f: F) -> MapResponse<Self, F> where
Self: Sized,
F: FnOnce(Self::Response) -> Response + Clone,

fn map_err<F, Error>(self, f: F) -> MapErr<Self, F> where
Self: Sized,
F: FnOnce(Self::Error) -> Error + Clone,

fn map_result<F, Response, Error>(self, f: F) -> MapResult<Self, F> where
Self: Sized,
Error: From<Self::Error>,
F: FnOnce(Result<Self::Response, Self::Error>) -> Result<Response, Error> + Clone,

fn map_request<F, NewRequest>(self, f: F) -> MapRequest<Self, F> where
Self: Sized,
F: FnMut(NewRequest) -> Request,

fn filter<F, NewRequest>(self, filter: F) -> Filter<Self, F> where
Self: Sized,
F: Predicate<NewRequest>,

fn filter_async<F, NewRequest>(self, filter: F) -> AsyncFilter<Self, F> where
Self: Sized,
F: AsyncPredicate<NewRequest>,

fn then<F, Response, Error, Fut>(self, f: F) -> Then<Self, F> where
Self: Sized,
Error: From<Self::Error>,
F: FnOnce(Result<Self::Response, Self::Error>) -> Fut + Clone,
Fut: Future<Output = Result<Response, Error>>,

fn map_future<F, Fut, Response, Error>(self, f: F) -> MapFuture<Self, F> where
Self: Sized,
F: FnMut(Self::Future) -> Fut,
Error: From<Self::Error>,
Fut: Future<Output = Result<Response, Error>>,

fn boxed(self) -> BoxService<Request, Self::Response, Self::Error> where
Self: Sized + Send + 'static,
Self::Future: Send + 'static,

fn boxed_clone(self) -> BoxCloneService<Request, Self::Response, Self::Error> where
Self: Clone + Sized + Send + 'static,
Self::Future: Send + 'static,

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

fn next(&mut self) -> Next<'_, Self> where
Self: Unpin,

fn into_future(self) -> StreamFuture<Self> where
Self: Unpin,

fn map<T, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> T,

fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future,

fn collect<C>(self) -> Collect<Self, C> where
C: Default + Extend<Self::Item>,

fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB> where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Stream<Item = (A, B)>,

fn concat(self) -> Concat<Self> where
Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
Self::Item: IntoIterator,
Self::Item: Default,

fn cycle(self) -> Cycle<Self> where
Self: Clone,

fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,

fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,

fn all<Fut, F>(self, f: F) -> All<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,

fn flatten(self) -> Flatten<Self> where
Self::Item: Stream,

fn flatten_unordered(
self,
limit: impl Into<Option<usize>>
) -> FlattenUnordered<Self> where
Self::Item: Stream,
Self::Item: Unpin,

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where
F: FnMut(Self::Item) -> U,
U: Stream,

fn flat_map_unordered<U, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> FlatMapUnordered<Self, U, F> where
U: Stream + Unpin,
F: FnMut(Self::Item) -> U,

fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F> where
F: FnMut(&mut S, Self::Item) -> Fut,
Fut: Future<Output = Option<B>>,

fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,

fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut> where
Fut: Future,

fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,

fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,

fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,

fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>> where
Self: 'a + Send,

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>> where
Self: 'a,

fn buffered(self, n: usize) -> Buffered<Self> where
Self::Item: Future,

fn buffer_unordered(self, n: usize) -> BufferUnordered<Self> where
Self::Item: Future,

fn zip<St>(self, other: St) -> Zip<Self, St> where
St: Stream,

fn chain<St>(self, other: St) -> Chain<Self, St> where
St: Stream<Item = Self::Item>,

fn forward<S>(self, sink: S) -> Forward<Self, S> where
S: Sink<Self::Ok, Error = Self::Error>,
Self: TryStream,

fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>) where
Self: Sink<Item>,

fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),

fn left_stream<B>(self) -> Either<Self, B> where
B: Stream<Item = Self::Item>,

fn right_stream<B>(self) -> Either<B, Self> where
B: Stream<Item = Self::Item>,

fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> where
Self: Unpin,

fn select_next_some(&mut self) -> SelectNextSome<'_, Self> where
Self: Unpin + FusedStream,

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

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

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

fn try_poll_next(
self: Pin<&mut S>,
cx: &mut Context<'_>
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

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

fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>,

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnMut(Self::Ok) -> T,

fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnMut(Self::Error) -> E,

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnMut(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,

fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where
F: FnMut(&Self::Ok),

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnMut(&Self::Error),