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use super::{Clock, Reference};
use std::prelude::v1::*;
use crate::nanos::Nanos;
use std::ops::Add;
use std::time::{Duration, Instant, SystemTime};
#[derive(Clone, Debug, Default)]
pub struct MonotonicClock;
impl Add<Nanos> for Instant {
type Output = Instant;
fn add(self, other: Nanos) -> Instant {
let other: Duration = other.into();
self + other
}
}
impl Reference for Instant {
fn duration_since(&self, earlier: Self) -> Nanos {
if earlier < *self {
(*self - earlier).into()
} else {
Nanos::from(Duration::new(0, 0))
}
}
fn saturating_sub(&self, duration: Nanos) -> Self {
self.checked_sub(duration.into()).unwrap_or(*self)
}
}
impl Clock for MonotonicClock {
type Instant = Instant;
fn now(&self) -> Self::Instant {
Instant::now()
}
}
#[derive(Clone, Debug, Default)]
pub struct SystemClock;
impl Reference for SystemTime {
fn duration_since(&self, earlier: Self) -> Nanos {
self.duration_since(earlier)
.unwrap_or_else(|_| Duration::new(0, 0))
.into()
}
fn saturating_sub(&self, duration: Nanos) -> Self {
self.checked_sub(duration.into()).unwrap_or(*self)
}
}
impl Add<Nanos> for SystemTime {
type Output = SystemTime;
fn add(self, other: Nanos) -> SystemTime {
let other: Duration = other.into();
self + other
}
}
impl Clock for SystemClock {
type Instant = SystemTime;
fn now(&self) -> Self::Instant {
SystemTime::now()
}
}
pub trait ReasonablyRealtime: Clock {
fn reference_point(&self) -> Self::Instant {
self.now()
}
}
impl ReasonablyRealtime for MonotonicClock {}
impl ReasonablyRealtime for SystemClock {}