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use std::future::{self, Future};
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use tokio::sync::watch;
#[derive(Clone, Debug)]
pub struct UpdateTracker {
update_operations: Arc<AtomicUsize>,
update_notifier: Arc<watch::Sender<()>>,
}
impl Default for UpdateTracker {
fn default() -> Self {
let (update_notifier, _) = watch::channel(());
Self {
update_operations: Default::default(),
update_notifier: Arc::new(update_notifier),
}
}
}
impl UpdateTracker {
pub fn is_update_in_progress(&self) -> bool {
self.update_operations.load(Ordering::Relaxed) > 0
}
pub fn watch_for_update(&self) -> impl Future<Output = ()> {
let mut update_subscriber = self.update_notifier.subscribe();
async move {
match update_subscriber.changed().await {
Ok(()) => (),
Err(_) => future::pending().await,
}
}
}
pub fn update(&self) -> UpdateGuard {
if self.update_operations.fetch_add(1, Ordering::Relaxed) == 0 {
self.update_notifier.send_replace(());
}
UpdateGuard::new(self.update_operations.clone())
}
}
#[derive(Debug)]
pub struct UpdateGuard {
update_operations: Arc<AtomicUsize>,
}
impl UpdateGuard {
fn new(update_operations: Arc<AtomicUsize>) -> Self {
Self { update_operations }
}
}
impl Drop for UpdateGuard {
fn drop(&mut self) {
self.update_operations.fetch_sub(1, Ordering::Relaxed);
}
}
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