Trait ExtractFuture

pub trait ExtractFuture {
    type Item;

    // Required methods
    fn poll(&mut self) -> Poll<(), Error>;
    fn extract(self) -> Self::Item;
}

Future representing the completion of extracting a value from a request

Implementations are expected to advance to a state where extract will succeed. This is done by performing any asynchronous processing when poll is called and usually stashing the extracted value internally until extract is called.

extract must not be called until poll returns Ok(Ready(())).

Required Associated Types

type Item

The argument extracted from the request.

Required Methods

fn poll(&mut self) -> Poll<(), Error>

Returns Ok(Ready(())) when extract() can be called. If NotReady is returned, the current task is registered for wakeup.

fn extract(self) -> Self::Item

Consume self and return the value extracted from the HTTP request.

Implementors

impl<T> ExtractFuture for ExtractOptionFuture<T>

where T: ExtractFuture,

type Item = Option<<T as ExtractFuture>::Item>

impl<T> ExtractFuture for Immediate<T>

type Item = T