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use futures::future::{FutureExt, LocalBoxFuture};
use futures::stream::StreamExt;
use crate::communicator::{Communicator, CoordNumOf, RoundNumOf};
use crate::event::ShutdownEventFor;
use crate::state::State;
use super::commits::Commits;
use super::state_keeper::EventStream;
pub trait Shutdown {
type State: State;
type Communicator: Communicator;
fn poll_shutdown(
&mut self,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<ShutdownEventFor<Self>>;
}
pub struct DefaultShutdown<S, C>
where
S: State<LogEntry = <C as Communicator>::LogEntry, Node = <C as Communicator>::Node>,
C: Communicator,
{
trigger: LocalBoxFuture<'static, ()>,
events: EventStream<S, RoundNumOf<C>, CoordNumOf<C>>,
commits: Commits,
}
impl<S, C> DefaultShutdown<S, C>
where
S: State<LogEntry = <C as Communicator>::LogEntry, Node = <C as Communicator>::Node>,
C: Communicator,
{
pub(crate) fn new(
trigger: LocalBoxFuture<'static, ()>,
events: EventStream<S, RoundNumOf<C>, CoordNumOf<C>>,
commits: Commits,
) -> Self {
Self {
trigger,
events,
commits,
}
}
}
impl<S, C> super::Shutdown for DefaultShutdown<S, C>
where
S: State<LogEntry = <C as Communicator>::LogEntry, Node = <C as Communicator>::Node>,
C: Communicator,
{
type State = S;
type Communicator = C;
fn poll_shutdown(
&mut self,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<ShutdownEventFor<Self>> {
let _ = self.trigger.poll_unpin(cx);
while let std::task::Poll::Ready(Some(())) = self.commits.poll_next(cx) {
}
self.events
.poll_next_unpin(cx)
.map(|e| e.expect("Event stream ended"))
}
}