veloren/common/src/event.rs

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use crate::comp;
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use parking_lot::Mutex;
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use specs::Entity as EcsEntity;
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use std::{collections::VecDeque, ops::DerefMut};
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use vek::*;
pub enum Event {
LandOnGround {
entity: EcsEntity,
vel: Vec3<f32>,
},
Explosion {
pos: Vec3<f32>,
radius: f32,
},
Die {
entity: EcsEntity,
cause: comp::HealthSource,
},
Jump(EcsEntity),
Respawn(EcsEntity),
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}
#[derive(Default)]
pub struct EventBus {
queue: Mutex<VecDeque<Event>>,
}
impl EventBus {
pub fn emitter(&self) -> Emitter {
Emitter {
bus: self,
events: VecDeque::new(),
}
}
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pub fn emit(&self, event: Event) {
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self.queue.lock().push_front(event);
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}
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pub fn recv_all(&self) -> impl ExactSizeIterator<Item = Event> {
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std::mem::replace(self.queue.lock().deref_mut(), VecDeque::new()).into_iter()
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}
}
pub struct Emitter<'a> {
bus: &'a EventBus,
events: VecDeque<Event>,
}
impl<'a> Emitter<'a> {
pub fn emit(&mut self, event: Event) {
self.events.push_front(event);
}
}
impl<'a> Drop for Emitter<'a> {
fn drop(&mut self) {
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self.bus.queue.lock().append(&mut self.events);
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}
}