pub fn poll_requeued(&mut self, cx: &mut Context<'_>) -> Poll<Option<T>> {
        tracing::trace!(rx.closed = self.rx_closed, pending = self.pending.len());

        // We process messages from the sender before looking at the delay queue so that
        // updates have a chance to reset/cancel pending updates.
        if !self.rx_closed {
            loop {
                match self.rx.poll_recv(cx) {
                    Poll::Pending => break,

                    Poll::Ready(None) => {
                        self.rx_closed = true;
                        break;
                    }

                    Poll::Ready(Some(Op::Clear)) => {
                        self.pending.clear();
                        self.q.clear();
                    }

                    Poll::Ready(Some(Op::Cancel(obj))) => {
                        if let Some(key) = self.pending.remove(&obj) {
                            tracing::trace!(?key, "canceling");
                            self.q.remove(&key);
                        }
                    }

                    Poll::Ready(Some(Op::Requeue(k, at))) => match self.pending.entry(k) {
                        hash_map::Entry::Occupied(ent) => {
                            let key = ent.get();
                            tracing::trace!(?key, "resetting");
                            self.q.reset_at(key, at);
                        }
                        hash_map::Entry::Vacant(slot) => {
                            let key = self.q.insert_at(slot.key().clone(), at);
                            tracing::trace!(?key, "inserting");
                            slot.insert(key);
                        }
                    },
                }
            }
        }

        if !self.pending.is_empty() {
            if let Poll::Ready(Some(exp)) = self.q.poll_expired(cx) {
                tracing::trace!(key = ?exp.key(), "dequeued");
                let obj = exp.into_inner();
                self.pending.remove(&obj);
                return Poll::Ready(Some(obj));
            }
        }

        if self.rx_closed && self.pending.is_empty() {
            Poll::Ready(None)
        } else {
            Poll::Pending
        }
    }
/// Attempts to process requeues, obtaining the next value from the delay queueand registering
/// current task for wakeup if the value is not yet available, and returning `None` if the
/// channel is exhausted.
Attempts to process requeues, obtaining the next value from the delay queueand registering
current task for wakeup if the value is not yet available, and returning `None` if the
channel is exhausted.
Attempts to process requeues obtaining the next value from the delay queueand registering current task for wakeup if the value is not yet available and returning ` None ` if the channel is exhausted .
pub fn poll_requeued(&mut self, cx: &mut Context<'_>) -> Poll<Option<T>> {
        tracing::trace!(rx.closed = self.rx_closed, pending = self.pending.len());
        // We process messages from the sender before looking at the delay queue so that
        // updates have a chance to reset/cancel pending updates.
        if !self.rx_closed {
            loop {
                match self.rx.poll_recv(cx) {
                    Poll::Pending => break,
                    Poll::Ready(None) => {
                        self.rx_closed = true;
                        break;
                    }
                    Poll::Ready(Some(Op::Clear)) => {
                        self.pending.clear();
                        self.q.clear();
                    }
                    Poll::Ready(Some(Op::Cancel(obj))) => {
                        if let Some(key) = self.pending.remove(&obj) {
                            tracing::trace!(?key, "canceling");
                            self.q.remove(&key);
                        }
                    }
                    Poll::Ready(Some(Op::Requeue(k, at))) => match self.pending.entry(k) {
                        hash_map::Entry::Occupied(ent) => {
                            let key = ent.get();
                            tracing::trace!(?key, "resetting");
                            self.q.reset_at(key, at);
                        }
                        hash_map::Entry::Vacant(slot) => {
                            let key = self.q.insert_at(slot.key().clone(), at);
                            tracing::trace!(?key, "inserting");
                            slot.insert(key);
                        }
                    },
                }
            }
        }
        if !self.pending.is_empty() {
            if let Poll::Ready(Some(exp)) = self.q.poll_expired(cx) {
                tracing::trace!(key = ?exp.key(), "dequeued");
                let obj = exp.into_inner();
                self.pending.remove(&obj);
                return Poll::Ready(Some(obj));
            }
        }
        if self.rx_closed && self.pending.is_empty() {
            Poll::Ready(None)
        } else {
            Poll::Pending
        }
    }
pub fn poll_requeued ( & mut self , cx : & mut Context < ' _ > ) -> Poll < Option < T > > { tracing :: trace ! ( rx closed self rx_closed pending self pending len ( ) ) ; // We process messages from the sender before looking at the delay queue so that // updates have a chance to reset/cancel pending updates. if ! self . rx_closed { loop { match self . rx . poll_recv ( cx ) { Poll :: Pending => break , Poll :: Ready ( None ) => { self . rx_closed = true ; break ; } Poll :: Ready ( Some ( Op :: Clear ) ) => { self . pending . clear ( ) ; self . q . clear ( ) ; } Poll :: Ready ( Some ( Op :: Cancel ( obj ) ) ) => { if let Some ( key ) = self . pending . remove ( & obj ) { tracing :: trace ! ( key " " ) ; self . q . remove ( & key ) ; } } Poll :: Ready ( Some ( Op :: Requeue ( k , at ) ) ) => match self . pending . entry ( k ) { hash_map :: Entry :: Occupied ( ent ) => { let key = ent . get ( ) ; tracing :: trace ! ( key " " ) ; self . q . reset_at ( key , at ) ; } hash_map :: Entry :: Vacant ( slot ) => { let key = self . q . insert_at ( slot . key ( ) . clone ( ) , at ) ; tracing :: trace ! ( key " " ) ; slot . insert ( key ) ; } } , } } } if ! self . pending . is_empty ( ) { if let Poll :: Ready ( Some ( exp ) ) = self . q . poll_expired ( cx ) { tracing :: trace ! ( key exp key ( ) " " ) ; let obj = exp . into_inner ( ) ; self . pending . remove ( & obj ) ; return Poll :: Ready ( Some ( obj ) ) ; } } if self . rx_closed && self . pending . is_empty ( ) { Poll :: Ready ( None ) } else { Poll :: Pending } }
Attempts to process requeues, obtaining the next value from the delay queueand registering
current task for wakeup if the value is not yet available, and returning `None` if the
channel is exhausted.
Attempts to process requeues obtaining the next value from the delay queueand registering current task for wakeup if the value is not yet available and returning ` None ` if the channel is exhausted .
&mut self
cx
&mut Context<'_>
&mut self
cx
&mut Context<'_>