67 lines
2.3 KiB
Rust
67 lines
2.3 KiB
Rust
use super::{waker::RcWake, Scheduler, SchedulerMsg};
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use crate::ScopeId;
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use std::cell::RefCell;
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use std::future::Future;
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use std::{pin::Pin, rc::Rc};
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/// A task's unique identifier.
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///
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/// `TaskId` is a `usize` that is unique across the entire VirtualDOM and across time. TaskIDs will never be reused
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/// once a Task has been completed.
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#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
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#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
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pub struct TaskId(pub usize);
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/// the task itself is the waker
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pub(crate) struct LocalTask {
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pub scope: ScopeId,
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pub(super) task: RefCell<Pin<Box<dyn Future<Output = ()> + 'static>>>,
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id: TaskId,
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tx: futures_channel::mpsc::UnboundedSender<SchedulerMsg>,
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}
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impl Scheduler {
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/// Start a new future on the same thread as the rest of the VirtualDom.
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///
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/// This future will not contribute to suspense resolving, so you should primarily use this for reacting to changes
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/// and long running tasks.
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///
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/// Whenever the component that owns this future is dropped, the future will be dropped as well.
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///
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/// Spawning a future onto the root scope will cause it to be dropped when the root component is dropped - which
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/// will only occur when the VirtuaalDom itself has been dropped.
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pub fn spawn(&self, scope: ScopeId, task: impl Future<Output = ()> + 'static) -> TaskId {
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let mut tasks = self.tasks.borrow_mut();
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let entry = tasks.vacant_entry();
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let task_id = TaskId(entry.key());
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entry.insert(Rc::new(LocalTask {
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id: task_id,
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tx: self.sender.clone(),
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task: RefCell::new(Box::pin(task)),
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scope,
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}));
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self.sender
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.unbounded_send(SchedulerMsg::TaskNotified(task_id))
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.expect("Scheduler should exist");
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task_id
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}
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/// Drop the future with the given TaskId
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///
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/// This does nto abort the task, so you'll want to wrap it in an aborthandle if that's important to you
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pub fn remove(&self, id: TaskId) {
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self.tasks.borrow_mut().remove(id.0);
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}
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}
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impl RcWake for LocalTask {
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fn wake_by_ref(arc_self: &Rc<Self>) {
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_ = arc_self
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.tx
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.unbounded_send(SchedulerMsg::TaskNotified(arc_self.id));
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}
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}
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