Trait tower_web::extract::ExtractFuture[−][src]

pub trait ExtractFuture {
    type Item;
    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(())).

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 Immediate<T> type Item = T;
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impl<T> ExtractFuture for ExtractOptionFuture<T> where T: ExtractFuture, type Item = Option<T::Item>;
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