pub fn spawn<H>(mut handler: H) -> Self
    where
        H: (FnMut(K)) + Send + 'static,
    {
        let (tx, mut rx) = mpsc::channel(8);
        tokio::spawn(async move {
            // Arbitrary sleep duration to use while idle.
            let idle_wait = TokioDuration::new(86400 * 365, 0);
            let mut deadline = TokioInstant::now() + idle_wait;
            let mut items = HashMap::<K, TokioInstant>::new();
            loop {
                let recv = rx.recv().fuse();
                let sleep = sleep_until(deadline).fuse();
                tokio::pin!(recv, sleep);
                match future::select(recv, sleep).await {
                    Either::Left((Some((key, item_deadline)), _)) => {
                        items.insert(key, item_deadline);
                        if item_deadline < deadline {
                            deadline = item_deadline;
                        }
                    }
                    Either::Left((None, _)) => break,
                    Either::Right(_) => {
                        let now = TokioInstant::now();
                        let mut expired_key = None;
                        deadline = now + idle_wait;
                        for (key, item_deadline) in &items {
                            if expired_key.is_none() && *item_deadline <= now {
                                expired_key = Some(key.clone());
                            } else if *item_deadline < deadline {
                                deadline = *item_deadline;
                            }
                        }
                        if let Some(key) = expired_key {
                            items.remove(&key);
                            handler(key);
                        }
                    }
                }
            }
        });
        DelayQueueTask { tx }
    }
/// Spawn a new task running a timer loop.
///
/// The handler function is called when a timer expires with the timer key. Note that this
/// function is called inside the Tokio run-time, and may not block.
Spawn a new task running a timer loop.
The handler function is called when a timer expires with the timer key. Note that this
function is called inside the Tokio run-time, and may not block.
Spawn a new task running a timer loop . The handler function is called when a timer expires with the timer key . Note that this function is called inside the Tokio run - time and may not block .
pub fn spawn<H>(mut handler: H) -> Self
    where
        H: (FnMut(K)) + Send + 'static,
    {
        let (tx, mut rx) = mpsc::channel(8);
        tokio::spawn(async move {
            // Arbitrary sleep duration to use while idle.
            let idle_wait = TokioDuration::new(86400 * 365, 0);
            let mut deadline = TokioInstant::now() + idle_wait;
            let mut items = HashMap::<K, TokioInstant>::new();
            loop {
                let recv = rx.recv().fuse();
                let sleep = sleep_until(deadline).fuse();
                tokio::pin!(recv, sleep);
                match future::select(recv, sleep).await {
                    Either::Left((Some((key, item_deadline)), _)) => {
                        items.insert(key, item_deadline);
                        if item_deadline < deadline {
                            deadline = item_deadline;
                        }
                    }
                    Either::Left((None, _)) => break,
                    Either::Right(_) => {
                        let now = TokioInstant::now();
                        let mut expired_key = None;
                        deadline = now + idle_wait;
                        for (key, item_deadline) in &items {
                            if expired_key.is_none() && *item_deadline <= now {
                                expired_key = Some(key.clone());
                            } else if *item_deadline < deadline {
                                deadline = *item_deadline;
                            }
                        }
                        if let Some(key) = expired_key {
                            items.remove(&key);
                            handler(key);
                        }
                    }
                }
            }
        });
        DelayQueueTask { tx }
    }
pub fn spawn < H > ( mut handler : H ) -> Self where H : ( FnMut ( K ) ) + Send + ' static , { let ( tx , mut rx ) = mpsc :: channel ( 8 ) ; tokio :: spawn ( async move { // Arbitrary sleep duration to use while idle. let idle_wait = TokioDuration :: new ( 86400 * 365 , 0 ) ; let mut deadline = TokioInstant :: now ( ) + idle_wait ; let mut items = HashMap :: < K , TokioInstant > :: new ( ) ; loop { let recv = rx . recv ( ) . fuse ( ) ; let sleep = sleep_until ( deadline ) . fuse ( ) ; tokio :: pin ! ( recv sleep ) ; match future :: select ( recv , sleep ) . await { Either :: Left ( ( Some ( ( key , item_deadline ) ) , _ ) ) => { items . insert ( key , item_deadline ) ; if item_deadline < deadline { deadline = item_deadline ; } } Either :: Left ( ( None , _ ) ) => break , Either :: Right ( _ ) => { let now = TokioInstant :: now ( ) ; let mut expired_key = None ; deadline = now + idle_wait ; for ( key , item_deadline ) in & items { if expired_key . is_none ( ) && * item_deadline <= now { expired_key = Some ( key . clone ( ) ) ; } else if * item_deadline < deadline { deadline = * item_deadline ; } } if let Some ( key ) = expired_key { items . remove ( & key ) ; handler ( key ) ; } } } } } ) ; DelayQueueTask { tx } }
Spawn a new task running a timer loop.
Spawn a new task running a timer loop .
handler
H
handler
H