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use std::{cell::RefCell, sync::Arc};
use parking_lot::RwLock;
use tokio::runtime::Handle;
#[cfg(feature = "unstable-stuck-detection")]
use crate::stuck_detection::StuckDetector;
use crate::{
addr::Addr,
address_book::{AddressBook, VacantEntry},
context::Context,
demux::{Demux, Filter as DemuxFilter},
envelope::Envelope,
group::Schema,
runtime::RuntimeManager,
};
#[derive(Clone)]
pub struct Topology {
pub(crate) book: AddressBook,
inner: Arc<RwLock<Inner>>,
}
#[derive(Default)]
struct Inner {
groups: Vec<ActorGroup>,
connections: Vec<Connection>,
rt_manager: RuntimeManager,
}
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct ActorGroup {
pub addr: Addr,
pub name: String,
pub is_entrypoint: bool,
}
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Connection {
pub from: Addr,
pub to: Addr,
}
impl Topology {
pub fn empty() -> Self {
Self {
book: AddressBook::new(),
inner: Arc::new(RwLock::new(Inner::default())),
}
}
#[stability::unstable]
pub fn add_dedicated_rt<F: Fn(&crate::ActorMeta) -> bool + Send + Sync + 'static>(
&self,
filter: F,
handle: Handle,
) {
self.inner.write().rt_manager.add(filter, handle);
}
#[cfg(feature = "unstable-stuck-detection")]
pub fn stuck_detector(&self) -> StuckDetector {
self.inner.read().rt_manager.stuck_detector()
}
pub fn local(&self, name: impl Into<String>) -> Local<'_> {
let name = name.into();
let entry = self.book.vacant_entry();
let mut inner = self.inner.write();
inner.groups.push(ActorGroup {
addr: entry.addr(),
name: name.clone(),
is_entrypoint: false,
});
Local {
name,
topology: self,
entry,
demux: RefCell::new(Demux::default()),
}
}
pub fn remote(&self, _name: impl Into<String>) -> Remote<'_> {
todo!()
}
pub fn actor_groups(&self) -> impl Iterator<Item = ActorGroup> + '_ {
let inner = self.inner.read();
inner.groups.clone().into_iter()
}
pub fn connections(&self) -> impl Iterator<Item = Connection> + '_ {
let inner = self.inner.read();
inner.connections.clone().into_iter()
}
}
impl Default for Topology {
fn default() -> Self {
Self::empty()
}
}
#[must_use]
pub struct Local<'t> {
name: String,
topology: &'t Topology,
entry: VacantEntry<'t>,
demux: RefCell<Demux>,
}
impl<'t> Local<'t> {
pub fn entrypoint(self) -> Self {
let mut inner = self.topology.inner.write();
let group = inner
.groups
.iter_mut()
.find(|group| group.addr == self.entry.addr())
.expect("just created");
group.is_entrypoint = true;
self
}
pub fn route_to(
&self,
dest: &impl GetAddrs,
filter: impl Fn(&Envelope) -> bool + Send + Sync + 'static,
) {
let filter = Arc::new(filter);
for addr in dest.addrs() {
self.demux
.borrow_mut()
.append(addr, DemuxFilter::Dynamic(filter.clone()));
}
}
pub fn route_all_to(&self, dest: &impl GetAddrs) {
self.route_to(dest, |_| true)
}
pub fn mount(self, schema: Schema) {
let addr = self.entry.addr();
let book = self.topology.book.clone();
let ctx = Context::new(book, self.demux.into_inner()).with_group(addr);
let rt_manager = self.topology.inner.read().rt_manager.clone();
let object = (schema.run)(ctx, self.name, rt_manager);
self.entry.insert(object);
}
}
pub struct Remote<'t> {
addr: Addr,
_topology: &'t Topology,
}
#[doc(hidden)]
pub trait GetAddrs {
fn addrs(&self) -> Vec<Addr>;
}
impl<'t> GetAddrs for Local<'t> {
fn addrs(&self) -> Vec<Addr> {
vec![self.entry.addr()]
}
}
impl<'t> GetAddrs for Remote<'t> {
fn addrs(&self) -> Vec<Addr> {
vec![self.addr]
}
}