pkecs 8.0.0

Another ECS implementation.
Documentation 
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//! Provides APIs to schedule/manage systems

use std::{any::TypeId, collections::HashMap};
use super::{entity::Entities, event::Events, system::System};

/// Contains systems which can be executed at set intervals.
#[derive(Default)]
pub struct Schedule {
    systems: HashMap<TypeId, Vec<Box<dyn System>>>,
}

impl Schedule {
    /// Registers a [`System`] to run at the specified [`SystemSchedule`].
    pub fn add_system<TSchedule, TSystem>(&mut self, _: TSchedule, system: TSystem)
        where
            TSchedule: 'static,
            TSystem: System + 'static,
    {
        let id = TypeId::of::<TSchedule>();

        self.systems
            .entry(id)
            .or_insert(vec![])
            .push(Box::new(system));
    }

    pub fn run_schedule<TSchedule>(&self, _: TSchedule, entities: &mut Entities, events: &mut Events)
        where
            TSchedule: 'static,
    {
        let id = TypeId::of::<TSchedule>();

        self.systems
            .get(&id)
            .map(|s| s.iter().for_each(|s| s.run(entities, events)));
    }
}

/// A schedule for systems which run once at application startup.
pub struct Startup;

/// A schedule for systems which run each application loop.
pub struct Update;

/// A schedule which runs at a fixed interval.
pub struct FixedUpdate;

/// A schedule which runs on application exit.
pub struct Shutdown;