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//! Job worker: a generic worker that just processes incoming
//! jobs one by one
use std::sync::Arc;
use async_trait::async_trait;
use tokio::sync::{mpsc, Mutex};
use crate::background::worker::*;
use crate::background::*;
pub(crate) struct JobWorker {
pub(crate) index: usize,
pub(crate) job_chan: Arc<Mutex<mpsc::UnboundedReceiver<(Job, bool)>>>,
pub(crate) next_job: Option<Job>,
}
#[async_trait]
impl Worker for JobWorker {
fn name(&self) -> String {
format!("Job worker #{}", self.index)
}
async fn work(&mut self, _must_exit: &mut watch::Receiver<bool>) -> Result<WorkerState, Error> {
match self.next_job.take() {
None => return Ok(WorkerState::Idle),
Some(job) => {
job.await?;
Ok(WorkerState::Busy)
}
}
}
async fn wait_for_work(&mut self, must_exit: &watch::Receiver<bool>) -> WorkerState {
loop {
match self.job_chan.lock().await.recv().await {
Some((job, cancellable)) => {
if cancellable && *must_exit.borrow() {
continue;
}
self.next_job = Some(job);
return WorkerState::Busy;
}
None => return WorkerState::Done,
}
}
}
}
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