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use crate::RollingTimer;
use std::time::{Instant, Duration};
use once_cell::sync::Lazy;
static T0: Lazy<Instant> = Lazy::new(|| {
Instant::now()
});
#[derive(Default, Clone)]
pub struct Timer<const TPS: u32>;
impl<const TPS: u32> Timer<TPS> {
const NANOS_PER_TICK: u128 = 1_000_000_000 / (TPS as u128);
pub fn new() -> Self {
Timer
}
}
impl<const TPS: u32> RollingTimer for Timer<TPS>
{
type Tick = u32;
const TICKS_PER_SECOND: Self::Tick = TPS;
fn is_initialized(&self) -> bool {
true
}
fn get_ticks(&self) -> Self::Tick {
let ticks = Instant::now()
.checked_duration_since(*T0)
.unwrap_or_else(|| Duration::from_secs(0));
let tnanos = ticks.as_nanos();
let div = tnanos / Self::NANOS_PER_TICK;
(div & 0xFFFF_FFFF) as u32
}
}
#[cfg(test)]
mod test {
use super::Timer;
use std::time::{Instant, Duration};
use std::thread::sleep;
use crate::RollingTimer;
#[test]
fn sanity_test_1m() {
let timer: Timer<1_000_000> = Timer::new();
let start_gh = timer.get_ticks();
let start = Instant::now();
sleep(Duration::from_secs(1));
let stop_gh = timer.millis_since(start_gh);
let stop = start.elapsed();
assert!(
(stop >= Duration::from_millis(998))
&& (stop <= Duration::from_millis(1002))
);
assert!(
(stop_gh >= 998) && (stop_gh <= 1002)
);
}
#[test]
fn sanity_test_1k() {
let timer: Timer<1_000> = Timer::new();
let start_gh = timer.get_ticks();
let start = Instant::now();
sleep(Duration::from_secs(1));
let stop_gh = timer.millis_since(start_gh);
let stop = start.elapsed();
assert!(
(stop >= Duration::from_millis(998))
&& (stop <= Duration::from_millis(1002))
);
assert!(
(stop_gh >= 998) && (stop_gh <= 1002)
);
}
#[test]
fn sanity_test_330() {
let timer: Timer<330> = Timer::new();
let start_gh = timer.get_ticks();
let start = Instant::now();
sleep(Duration::from_secs(1));
let stop_gh = timer.millis_since(start_gh);
let stop = start.elapsed();
assert!(
(stop >= Duration::from_millis(998))
&& (stop <= Duration::from_millis(1002))
);
assert!(
(stop_gh >= 998) && (stop_gh <= 1002)
);
}
}