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use crate::{
resource::Resources,
system::{System, SystemId, ThreadLocalExecution},
};
use bevy_hecs::World;
use bevy_utils::{HashMap, HashSet};
use std::borrow::Cow;
#[derive(Default)]
pub struct Schedule {
pub(crate) stages: HashMap<Cow<'static, str>, Vec<Box<dyn System>>>,
pub(crate) stage_order: Vec<Cow<'static, str>>,
pub(crate) system_ids: HashSet<SystemId>,
generation: usize,
last_initialize_generation: usize,
}
impl Schedule {
pub fn add_stage(&mut self, stage: impl Into<Cow<'static, str>>) {
let stage: Cow<str> = stage.into();
if self.stages.get(&stage).is_some() {
panic!("Stage already exists: {}", stage);
} else {
self.stages.insert(stage.clone(), Vec::new());
self.stage_order.push(stage);
}
}
pub fn add_stage_after(
&mut self,
target: impl Into<Cow<'static, str>>,
stage: impl Into<Cow<'static, str>>,
) {
let target: Cow<str> = target.into();
let stage: Cow<str> = stage.into();
if self.stages.get(&stage).is_some() {
panic!("Stage already exists: {}", stage);
}
let target_index = self
.stage_order
.iter()
.enumerate()
.find(|(_i, stage)| **stage == target)
.map(|(i, _)| i)
.unwrap_or_else(|| panic!("Target stage does not exist: {}", target));
self.stages.insert(stage.clone(), Vec::new());
self.stage_order.insert(target_index + 1, stage);
}
pub fn add_stage_before(
&mut self,
target: impl Into<Cow<'static, str>>,
stage: impl Into<Cow<'static, str>>,
) {
let target: Cow<str> = target.into();
let stage: Cow<str> = stage.into();
if self.stages.get(&stage).is_some() {
panic!("Stage already exists: {}", stage);
}
let target_index = self
.stage_order
.iter()
.enumerate()
.find(|(_i, stage)| **stage == target)
.map(|(i, _)| i)
.unwrap_or_else(|| panic!("Target stage does not exist: {}", target));
self.stages.insert(stage.clone(), Vec::new());
self.stage_order.insert(target_index, stage);
}
pub fn add_system_to_stage(
&mut self,
stage_name: impl Into<Cow<'static, str>>,
system: Box<dyn System>,
) -> &mut Self {
let stage_name = stage_name.into();
let systems = self
.stages
.get_mut(&stage_name)
.unwrap_or_else(|| panic!("Stage does not exist: {}", stage_name));
if self.system_ids.contains(&system.id()) {
panic!(
"System with id {:?} ({}) already exists",
system.id(),
system.name()
);
}
self.system_ids.insert(system.id());
systems.push(system);
self.generation += 1;
self
}
pub fn add_system_to_stage_front(
&mut self,
stage_name: impl Into<Cow<'static, str>>,
system: Box<dyn System>,
) -> &mut Self {
let stage_name = stage_name.into();
let systems = self
.stages
.get_mut(&stage_name)
.unwrap_or_else(|| panic!("Stage does not exist: {}", stage_name));
if self.system_ids.contains(&system.id()) {
panic!(
"System with id {:?} ({}) already exists",
system.id(),
system.name()
);
}
self.system_ids.insert(system.id());
systems.insert(0, system);
self.generation += 1;
self
}
pub fn run(&mut self, world: &mut World, resources: &mut Resources) {
for stage_name in self.stage_order.iter() {
if let Some(stage_systems) = self.stages.get_mut(stage_name) {
for system in stage_systems.iter_mut() {
#[cfg(feature = "profiler")]
crate::profiler_start(resources, system.name().clone());
system.update_archetype_access(world);
match system.thread_local_execution() {
ThreadLocalExecution::NextFlush => system.run(world, resources),
ThreadLocalExecution::Immediate => {
system.run(world, resources);
system.run_thread_local(world, resources);
}
}
#[cfg(feature = "profiler")]
crate::profiler_stop(resources, system.name().clone());
}
for system in stage_systems.iter_mut() {
match system.thread_local_execution() {
ThreadLocalExecution::NextFlush => {
system.run_thread_local(world, resources)
}
ThreadLocalExecution::Immediate => { }
}
}
}
}
world.clear_trackers();
resources.clear_trackers();
}
pub fn initialize(&mut self, world: &mut World, resources: &mut Resources) {
if self.last_initialize_generation == self.generation {
return;
}
for stage in self.stages.values_mut() {
for system in stage.iter_mut() {
system.initialize(world, resources);
}
}
self.last_initialize_generation = self.generation;
}
pub fn generation(&self) -> usize {
self.generation
}
}