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use tokio::sync::mpsc;
pub trait DropJoinable: Send + Sync + 'static {
fn destroy(self);
}
impl<X: Send + Sync + 'static> DropJoinable for tokio::task::JoinHandle<X> {
fn destroy(self) {
self.abort();
}
}
impl<X: Send + Sync + 'static> DropJoinable for std::thread::JoinHandle<X> {
fn destroy(self) {
tokio::task::spawn_blocking(move || {
self.join().map_err(|e| error!("Can't join a thread: {:?}", e)).ok();
});
}
}
#[derive(Debug)]
pub struct DropJoin<T: DropJoinable> {
sender: mpsc::UnboundedSender<Option<T>>,
}
impl<T: DropJoinable> Clone for DropJoin<T> {
fn clone(&self) -> Self {
Self {
sender: self.sender.clone(),
}
}
}
impl<T: DropJoinable> Default for DropJoin<T> {
fn default() -> Self {
DropJoin::new()
}
}
impl<T: DropJoinable> DropJoin<T> {
pub fn new() -> Self {
let (sender, receiver) = mpsc::unbounded_channel();
tokio::spawn(Self::drop_listener(receiver));
DropJoin { sender }
}
pub fn append(&self, item: T) {
self.sender.send(Some(item)).ok();
}
pub fn flush(&self) {
self.sender.send(None).ok();
}
async fn drop_listener(mut receiver: mpsc::UnboundedReceiver<Option<T>>) {
let mut values = vec![];
while let Some(value) = receiver.recv().await {
match value {
Some(x) => values.push(x),
None => {
for value in values.drain(..) {
value.destroy();
}
}
}
}
for value in values {
value.destroy();
}
}
}