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use crate::{Instant, TimeHandlerGuard, TimerRegistry};
use std::fmt::{Debug, Formatter};
use std::future::{poll_fn, Future};
use std::pin::Pin;
use std::sync::Arc;
use std::task::{ready, Context, Poll};
use std::time::Duration;
pub struct Interval {
timer_registry: Arc<TimerRegistry>,
sleep: Pin<Box<dyn Future<Output = TimeHandlerGuard> + Send>>,
next_deadline: Instant,
period: Duration,
}
impl Interval {
pub(crate) fn new(timer_registry: Arc<TimerRegistry>, start: Instant, period: Duration) -> Self {
let sleep = Box::pin(timer_registry.sleep_until(start));
Self {
timer_registry,
sleep,
next_deadline: start,
period,
}
}
pub async fn tick(&mut self) -> (TimeHandlerGuard, Instant) {
poll_fn(|context| self.poll_tick(context)).await
}
pub fn poll_tick(&mut self, context: &mut Context<'_>) -> Poll<(TimeHandlerGuard, Instant)> {
let guard = ready!(self.sleep.as_mut().poll(context));
let tick_time = self.next_deadline;
self.next_deadline = tick_time + self.period;
self.sleep = Box::pin(self.timer_registry.sleep_until(self.next_deadline));
Poll::Ready((guard, tick_time))
}
pub fn reset(&mut self) {
let now = self.timer_registry.now();
self.next_deadline = now + self.period;
self.sleep = Box::pin(self.timer_registry.sleep_until(self.next_deadline));
}
pub fn period(&self) -> Duration {
self.period
}
}
impl Debug for Interval {
fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
let Self {
timer_registry,
sleep: _,
next_deadline,
period,
} = self;
formatter
.debug_struct("Interval")
.field("timer_registry", timer_registry)
.field("sleep", &"impl Future<Output = TimeHandlerGuard>")
.field("next_deadline", next_deadline)
.field("period", period)
.finish()
}
}