Struct Feed 

pub struct Feed<S: FeedSource> { /* private fields */ }

One background feed as a control loop uses it.

The select! arm hands the message that woke the loop to Feed::accept, and the drain that follows walks Feed::next_ready until the feed is empty, so a burst of updates costs one draw. A closed channel reports None for ever, which would leave its arm permanently ready; accept retires the feed instead, and Feed::is_open gates the arm.

Implementations

impl<S: FeedSource> Feed<S>

pub fn new(source: S) -> Self

pub fn is_open(&self) -> bool

pub fn wait(&mut self) -> impl Future<Output = Option<S::Item>>

pub fn accept(&mut self, message: Option<S::Item>) -> bool

Latches the message that won the select and reports whether one arrived. Applying it determines whether the visible state needs a redraw.

pub fn next_ready(&mut self) -> Option<S::Item>

The next message for the batch drain: the one that won the select first, then whatever queued behind it.