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use std::{fmt::Debug, iter::Iterator, sync::Arc};
use super::{
entity::Entity,
query::filter::LayoutFilter,
storage::{
archetype::{Archetype, ArchetypeIndex},
component::ComponentTypeId,
},
};
#[derive(Debug, Clone)]
pub enum Event {
ArchetypeCreated(ArchetypeIndex),
EntityInserted(Entity, ArchetypeIndex),
EntityRemoved(Entity, ArchetypeIndex),
}
pub trait EventSender: Send + Sync {
fn send(&self, event: Event) -> bool;
}
#[cfg(feature = "crossbeam-events")]
impl EventSender for crossbeam_channel::Sender<Event> {
fn send(&self, event: Event) -> bool {
!matches!(
self.try_send(event),
Err(crossbeam_channel::TrySendError::Disconnected(_))
)
}
}
#[derive(Clone)]
pub(crate) struct Subscriber {
filter: Arc<dyn LayoutFilter + Send + Sync>,
sender: Arc<dyn EventSender>,
}
impl Subscriber {
pub(crate) fn new<F, S>(filter: F, sender: S) -> Self
where
F: LayoutFilter + Send + Sync + 'static,
S: EventSender + 'static,
{
Self {
filter: Arc::new(filter),
sender: Arc::new(sender),
}
}
pub(crate) fn is_interested(&self, archetype: &Archetype) -> bool {
self.filter
.matches_layout(archetype.layout().component_types())
.is_pass()
}
pub(crate) fn send(&self, message: Event) -> bool {
self.sender.send(message)
}
}
#[derive(Clone, Default)]
pub(crate) struct Subscribers {
subscribers: Vec<Subscriber>,
}
impl Subscribers {
pub fn push(&mut self, subscriber: Subscriber) {
self.subscribers.push(subscriber);
}
pub fn send(&mut self, message: Event) {
for i in (0..self.subscribers.len()).rev() {
if !self.subscribers[i].send(message.clone()) {
self.subscribers.swap_remove(i);
}
}
}
pub fn matches_layout(&self, components: &[ComponentTypeId]) -> Self {
Self {
subscribers: self
.subscribers
.iter()
.filter(|sub| sub.filter.matches_layout(components).is_pass())
.cloned()
.collect(),
}
}
}
impl Debug for Subscribers {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Subscribers")
.field("len", &self.subscribers.len())
.finish()
}
}