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use std::{any::Any, collections::HashMap, fmt::Debug, sync::Arc};
use flume::{Receiver, Sender};
use tokio::sync::oneshot;
use crate::tasks::{
handle::{Handle, Id},
manager::{ManagedJob, Manager},
traits::Executable,
Job, Keyed,
};
pub struct Jobs<Key> {
last_task_id: u64,
result_senders: HashMap<Id, Vec<Box<dyn AnySender>>>,
keyed_jobs: HashMap<Key, Id>,
queuer: Sender<Box<dyn Executable>>,
queue: Receiver<Box<dyn Executable>>,
}
impl<Key> Debug for Jobs<Key>
where
Key: Debug,
{
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Jobs")
.field("last_task_id", &self.last_task_id)
.field("result_senders", &self.result_senders.len())
.field("keyed_jobs", &self.keyed_jobs)
.field("queuer", &self.queuer)
.field("queue", &self.queue)
.finish()
impl<Key> Default for Jobs<Key> {
fn default() -> Self {
let (queuer, queue) = flume::unbounded();
Self {
last_task_id: 0,
result_senders: HashMap::new(),
keyed_jobs: HashMap::new(),
queuer,
queue,
impl<Key> Jobs<Key>
Key: Clone + std::hash::Hash + Eq + Send + Sync + Debug + 'static,
pub fn queue(&self) -> Receiver<Box<dyn Executable>> {
self.queue.clone()
pub fn enqueue<J: Job + 'static>(
&mut self,
job: J,
key: Option<Key>,
manager: Manager<Key>,
) -> Handle<J::Output, J::Error> {
self.last_task_id = self.last_task_id.wrapping_add(1);
let id = Id(self.last_task_id);
self.queuer
.send(Box::new(ManagedJob {
id,
job,
manager,
key,
}))
.unwrap();
self.create_new_task_handle(id)
pub fn create_new_task_handle<T: Send + Sync + 'static, E: Send + Sync + 'static>(
id: Id,
) -> Handle<T, E> {
let (sender, receiver) = oneshot::channel();
let senders = self.result_senders.entry(id).or_insert_with(Vec::default);
senders.push(Box::new(Some(sender)));
Handle { id, receiver }
pub fn lookup_or_enqueue<J: Keyed<Key>>(
) -> Handle<<J as Job>::Output, <J as Job>::Error> {
let key = job.key();
if let Some(&id) = self.keyed_jobs.get(&key) {
} else {
let handle = self.enqueue(job, Some(key.clone()), manager);
self.keyed_jobs.insert(key, handle.id);
handle
pub fn job_completed<T: Clone + Send + Sync + 'static, E: Send + Sync + 'static>(
key: Option<&Key>,
result: Result<T, E>,
) {
if let Some(key) = key {
self.keyed_jobs.remove(key);
if let Some(senders) = self.result_senders.remove(&id) {
let result = result.map_err(Arc::new);
for mut sender_handle in senders {
let sender = sender_handle
.as_any_mut()
.downcast_mut::<Option<oneshot::Sender<Result<T, Arc<E>>>>>()
if let Some(sender) = sender.take() {
drop(sender.send(result.clone()));
pub trait AnySender: Any + Send + Sync {
fn as_any_mut(&mut self) -> &'_ mut dyn Any;
impl<T> AnySender for Option<oneshot::Sender<T>>
T: Send + Sync + 'static,
fn as_any_mut(&mut self) -> &'_ mut dyn Any {
self