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use crate::{Actor, ActorId, Caller, Context, Error, Handler, Message, Result, Sender};
use futures::channel::{mpsc, oneshot};
use futures::future::Shared;
use futures::Future;
use std::hash::{Hash, Hasher};
use std::pin::Pin;
use std::sync::{Arc, Mutex, Weak};
type ExecFuture<'a> = Pin<Box<dyn Future<Output = ()> + Send + 'a>>;
pub(crate) type ExecFn<A> =
Box<dyn for<'a> FnOnce(&'a mut A, &'a mut Context<A>) -> ExecFuture<'a> + Send + 'static>;
pub(crate) enum ActorEvent<A> {
Exec(ExecFn<A>),
Stop(Option<Error>),
RemoveStream(usize),
}
pub struct Addr<A> {
pub(crate) actor_id: ActorId,
pub(crate) tx: Arc<mpsc::UnboundedSender<ActorEvent<A>>>,
pub(crate) rx_exit: Option<Shared<oneshot::Receiver<()>>>,
}
impl<A> Clone for Addr<A> {
fn clone(&self) -> Self {
Self {
actor_id: self.actor_id,
tx: self.tx.clone(),
rx_exit: self.rx_exit.clone(),
}
}
}
impl<A> Addr<A> {
pub fn downgrade(&self) -> WeakAddr<A> {
WeakAddr {
actor_id: self.actor_id,
tx: Arc::downgrade(&self.tx),
rx_exit: self.rx_exit.clone(),
}
}
}
impl<A> PartialEq for Addr<A> {
fn eq(&self, other: &Self) -> bool {
self.actor_id == other.actor_id
}
}
impl<A> Hash for Addr<A> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.actor_id.hash(state)
}
}
impl<A: Actor> Addr<A> {
pub fn actor_id(&self) -> ActorId {
self.actor_id
}
pub fn stop(&mut self, err: Option<Error>) -> Result<()> {
mpsc::UnboundedSender::clone(&*self.tx).start_send(ActorEvent::Stop(err))?;
Ok(())
}
pub async fn call<T: Message>(&self, msg: T) -> Result<T::Result>
where
A: Handler<T>,
{
let (tx, rx) = oneshot::channel();
mpsc::UnboundedSender::clone(&*self.tx).start_send(ActorEvent::Exec(Box::new(
move |actor, ctx| {
Box::pin(async move {
let res = Handler::handle(actor, ctx, msg).await;
let _ = tx.send(res);
})
},
)))?;
Ok(rx.await?)
}
pub fn send<T: Message<Result = ()>>(&self, msg: T) -> Result<()>
where
A: Handler<T>,
{
mpsc::UnboundedSender::clone(&*self.tx).start_send(ActorEvent::Exec(Box::new(
move |actor, ctx| {
Box::pin(async move {
Handler::handle(actor, ctx, msg).await;
})
},
)))?;
Ok(())
}
pub fn caller<T: Message>(&self) -> Caller<T>
where
A: Handler<T>,
{
let weak_tx = Arc::downgrade(&self.tx);
Caller {
actor_id: self.actor_id.clone(),
caller_fn: Mutex::new(Box::new(move |msg| {
let weak_tx_option = weak_tx.upgrade();
Box::pin(async move {
match weak_tx_option {
Some(tx) => {
let (oneshot_tx, oneshot_rx) = oneshot::channel();
mpsc::UnboundedSender::clone(&tx).start_send(ActorEvent::Exec(
Box::new(move |actor, ctx| {
Box::pin(async move {
let res = Handler::handle(&mut *actor, ctx, msg).await;
let _ = oneshot_tx.send(res);
})
}),
))?;
Ok(oneshot_rx.await?)
}
None => Err(anyhow::anyhow!("Actor Dropped")),
}
})
})),
}
}
pub fn sender<T: Message<Result = ()>>(&self) -> Sender<T>
where
A: Handler<T>,
{
let weak_tx = Arc::downgrade(&self.tx);
Sender {
actor_id: self.actor_id.clone(),
sender_fn: Box::new(move |msg| match weak_tx.upgrade() {
Some(tx) => {
mpsc::UnboundedSender::clone(&tx).start_send(ActorEvent::Exec(Box::new(
move |actor, ctx| {
Box::pin(async move {
Handler::handle(&mut *actor, ctx, msg).await;
})
},
)))?;
Ok(())
}
None => Ok(()),
}),
}
}
pub async fn wait_for_stop(self) {
if let Some(rx_exit) = self.rx_exit {
rx_exit.await.ok();
} else {
futures::future::pending::<()>().await;
}
}
}
pub struct WeakAddr<A> {
pub(crate) actor_id: ActorId,
pub(crate) tx: Weak<mpsc::UnboundedSender<ActorEvent<A>>>,
pub(crate) rx_exit: Option<Shared<oneshot::Receiver<()>>>,
}
impl<A> PartialEq for WeakAddr<A> {
fn eq(&self, other: &Self) -> bool {
self.actor_id == other.actor_id
}
}
impl<A> Hash for WeakAddr<A> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.actor_id.hash(state)
}
}
impl<A> WeakAddr<A> {
pub fn upgrade(&self) -> Option<Addr<A>> {
match self.tx.upgrade() {
Some(tx) => Some(Addr {
actor_id: self.actor_id,
tx,
rx_exit: self.rx_exit.clone(),
}),
None => None,
}
}
}
impl<A> Clone for WeakAddr<A> {
fn clone(&self) -> Self {
Self {
actor_id: self.actor_id,
tx: self.tx.clone(),
rx_exit: self.rx_exit.clone(),
}
}
}
impl<A: Actor> WeakAddr<A> {
pub fn actor_id(&self) -> ActorId {
self.actor_id
}
}