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use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::time::Duration;
use futures_core::ready;
use pin_project_lite::pin_project;
use tokio::sync::oneshot;
use crate::actor::Actor;
use crate::clock::{sleep, Sleep};
use crate::fut::{ActorFuture, ActorStream};
#[deprecated(
since = "0.11.0",
note = "Please use tokio::sync::oneshot::Sender instead."
)]
pub struct Condition<T>
where
T: Clone,
{
waiters: Vec<oneshot::Sender<T>>,
}
impl<T> Condition<T>
where
T: Clone,
{
pub fn wait(&mut self) -> oneshot::Receiver<T> {
let (tx, rx) = oneshot::channel();
self.waiters.push(tx);
rx
}
pub fn set(self, result: T) {
for waiter in self.waiters {
let _ = waiter.send(result.clone());
}
}
}
impl<T> Default for Condition<T>
where
T: Clone,
{
fn default() -> Self {
Condition {
waiters: Vec::new(),
}
}
}
pin_project! {
/// An `ActorFuture` that runs a function in the actor's context after a specified amount of time.
///
/// Unless you specifically need access to the future, use [`Context::run_later`] instead.
///
/// [`Context::run_later`]: ../prelude/trait.AsyncContext.html#method.run_later
///
/// ```
/// # use std::io;
/// use std::time::Duration;
/// use actix::prelude::*;
/// use actix::utils::TimerFunc;
///
/// struct MyActor;
///
/// impl MyActor {
/// fn stop(&mut self, context: &mut Context<Self>) {
/// System::current().stop();
/// }
/// }
///
/// impl Actor for MyActor {
/// type Context = Context<Self>;
///
/// fn started(&mut self, context: &mut Context<Self>) {
/// // spawn a delayed future into our context
/// TimerFunc::new(Duration::from_millis(100), Self::stop)
/// .spawn(context);
/// }
/// }
/// # fn main() {
/// # let mut sys = System::new();
/// # let addr = sys.block_on(async { MyActor.start() });
/// # sys.run();
/// # }
#[must_use = "future do nothing unless polled"]
#[allow(clippy::type_complexity)]
pub struct TimerFunc<A: Actor> {
f: Option<Box<dyn FnOnce(&mut A, &mut A::Context)>>,
#[pin]
timeout: Sleep,
}
}
impl<A: Actor> TimerFunc<A> {
/// Creates a new `TimerFunc` with the given duration.
pub fn new<F>(timeout: Duration, f: F) -> TimerFunc<A>
where
F: FnOnce(&mut A, &mut A::Context) + 'static,
{
TimerFunc {
f: Some(Box::new(f)),
timeout: sleep(timeout),
}
}
}
impl<A> ActorFuture<A> for TimerFunc<A>
where
A: Actor,
{
type Output = ();
fn poll(
self: Pin<&mut Self>,
act: &mut A,
ctx: &mut A::Context,
task: &mut Context<'_>,
) -> Poll<Self::Output> {
let this = self.project();
ready!(this.timeout.poll(task));
let f = this.f.take().expect("TimerFunc polled after finish");
f(act, ctx);
Poll::Ready(())
}
}
pin_project! {
/// An `ActorStream` that periodically runs a function in the actor's context.
///
/// Unless you specifically need access to the future, use [`Context::run_interval`] instead.
///
/// [`Context::run_interval`]: ../prelude/trait.AsyncContext.html#method.run_interval
///
/// ```
/// # use std::io;
/// use std::time::Duration;
/// use actix::prelude::*;
/// use actix::utils::IntervalFunc;
///
/// struct MyActor;
///
/// impl MyActor {
/// fn tick(&mut self, context: &mut Context<Self>) {
/// println!("tick");
/// }
/// }
///
/// impl Actor for MyActor {
/// type Context = Context<Self>;
///
/// fn started(&mut self, context: &mut Context<Self>) {
/// // spawn an interval stream into our context
/// IntervalFunc::new(Duration::from_millis(100), Self::tick)
/// .finish()
/// .spawn(context);
/// # context.run_later(Duration::from_millis(200), |_, _| System::current().stop());
/// }
/// }
/// # fn main() {
/// # let mut sys = System::new();
/// # let addr = sys.block_on(async { MyActor.start() });
/// # sys.run();
/// # }
/// ```
#[must_use = "future do nothing unless polled"]
pub struct IntervalFunc<A: Actor> {
f: Box<dyn FnMut(&mut A, &mut A::Context)>,
dur: Duration,
#[pin]
timer: Sleep,
}
}
impl<A: Actor> IntervalFunc<A> {
/// Creates a new `IntervalFunc` with the given interval duration.
pub fn new<F>(dur: Duration, f: F) -> IntervalFunc<A>
where
F: FnMut(&mut A, &mut A::Context) + 'static,
{
Self {
f: Box::new(f),
dur,
timer: sleep(dur),
}
}
}
impl<A: Actor> ActorStream<A> for IntervalFunc<A> {
type Item = ();
fn poll_next(
self: Pin<&mut Self>,
act: &mut A,
ctx: &mut A::Context,
task: &mut Context<'_>,
) -> Poll<Option<Self::Item>> {
let mut this = self.project();
loop {
ready!(this.timer.as_mut().poll(task));
let now = this.timer.deadline();
this.timer.as_mut().reset(now + *this.dur);
(this.f)(act, ctx);
}
}
}