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use std::{fmt, future::Future, pin::Pin};
use chrono::{DateTime, Local, TimeZone};
use crate::{
job::Job,
job_schedule::{JobSchedule, WithSchedule},
timeprovider::{ChronoTimeProvider, TimeProvider},
Interval,
};
pub type JobFuture = Box<dyn Future<Output = ()> + Send + 'static>;
pub struct AsyncJob<Tz = Local, Tp = ChronoTimeProvider>
where
Tz: TimeZone,
Tp: TimeProvider,
{
schedule: JobSchedule<Tz, Tp>,
job: Option<Box<dyn GiveMeAPinnedFuture + Send>>,
}
trait GiveMeAPinnedFuture {
fn get_pinned(&mut self) -> Pin<JobFuture>;
}
struct JobWrapper<F, T>
where
F: FnMut() -> T,
T: Future,
{
f: F,
}
impl<F, T> JobWrapper<F, T>
where
F: FnMut() -> T,
T: Future,
{
fn new(f: F) -> Self {
JobWrapper { f }
}
}
impl<F, T> GiveMeAPinnedFuture for JobWrapper<F, T>
where
F: FnMut() -> T,
T: Future<Output = ()> + Send + 'static,
{
fn get_pinned(&mut self) -> Pin<JobFuture> {
Box::pin((self.f)())
}
}
impl<Tz, Tp> WithSchedule<Tz, Tp> for AsyncJob<Tz, Tp>
where
Tz: TimeZone,
Tp: TimeProvider,
{
fn schedule_mut(&mut self) -> &mut JobSchedule<Tz, Tp> {
&mut self.schedule
}
fn schedule(&self) -> &JobSchedule<Tz, Tp> {
&self.schedule
}
}
impl<Tz, Tp> fmt::Debug for AsyncJob<Tz, Tp>
where
Tz: TimeZone,
Tp: TimeProvider,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.schedule.fmt(f)
}
}
impl<Tz, Tp> Job<Tz, Tp> for AsyncJob<Tz, Tp>
where
Tz: TimeZone + Sync + Send,
Tp: TimeProvider,
{
}
impl<Tz, Tp> AsyncJob<Tz, Tp>
where
Tz: chrono::TimeZone + Sync + Send,
Tp: TimeProvider,
{
pub(crate) fn new(ival: Interval, tz: Tz) -> Self {
AsyncJob {
schedule: JobSchedule::new(ival, tz),
job: None,
}
}
pub fn run<F, T>(&mut self, f: F) -> &mut Self
where
F: 'static + FnMut() -> T + Send,
T: 'static + Future<Output = ()> + Send,
{
self.job = Some(Box::new(JobWrapper::new(f)));
self.schedule.start_schedule();
self
}
pub fn execute(&mut self, now: &DateTime<Tz>) -> Option<Pin<JobFuture>> {
if !self.schedule.can_run_again() {
return None;
}
let rv = self.job.as_mut().map(|f| f.get_pinned());
self.schedule.schedule_next(now);
rv
}
}