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|
use std::{
any::{Any, TypeId},
collections::HashMap,
sync::{Arc, Mutex},
};
use crate::{ChainProcess, Program, ProgramCollect, this};
pub(crate) type GlobalResources = Arc<Mutex<HashMap<TypeId, Box<dyn Any + Sync + Send>>>>;
impl<C> Program<C>
where
C: ProgramCollect<Enum = C>,
{
/// Insert a resource of the given type, cloning the provided value into the store
pub fn with_resource<Res: 'static + Send + Sync + ResourceMarker>(&mut self, res: Res) {
if let Ok(mut guard) = self.resources.lock() {
guard.insert(TypeId::of::<Res>(), Box::new(Arc::new(res)));
}
}
/// Modify a resource by type, applying a closure to the resource if present
pub fn modify_res<Res, Return>(&self, f: impl FnOnce(&mut Res) -> Return) -> Return
where
Res: 'static + Default + ResourceMarker + Send + Sync,
Return: Default,
{
let mut guard = match self.resources.lock() {
Ok(guard) => guard,
Err(_) => {
return Return::default();
}
};
if let Some(arc_res) = guard
.get_mut(&TypeId::of::<Res>())
.and_then(|a| a.downcast_mut::<Arc<Res>>())
{
let mut new_res = match Arc::try_unwrap(std::mem::take(arc_res)) {
Ok(val) => val,
Err(arc) => (*arc).res_clone(),
};
let r = f(&mut new_res);
*arc_res = Arc::new(new_res);
return r;
}
Return::default()
}
/// Internal syntax for the `&mut MyResource` syntax of #[chain], do not use directly
#[doc(hidden)]
pub fn __modify_res_and_return_route<Res, Return>(
&self,
f: impl FnOnce(&mut Res) -> Return,
) -> impl Into<ChainProcess<C>>
where
Res: 'static + Default + ResourceMarker + Send + Sync,
Return: Into<ChainProcess<C>>,
{
let mut guard = match self.resources.lock() {
Ok(guard) => guard,
Err(_) => {
let mut default_res = Res::res_default();
return f(&mut default_res);
}
};
if let Some(arc_res) = guard
.get_mut(&TypeId::of::<Res>())
.and_then(|a| a.downcast_mut::<Arc<Res>>())
{
let mut new_res = match Arc::try_unwrap(std::mem::take(arc_res)) {
Ok(val) => val,
Err(arc) => (*arc).res_clone(),
};
let r = f(&mut new_res);
*arc_res = Arc::new(new_res);
r
} else {
let mut default_res = Res::res_default();
f(&mut default_res)
}
}
/// Get an resources by type, returning `Res` if present
pub fn res<Res: 'static + Send + Sync>(&self) -> Option<GlobalResource<Res>> {
let guard = self.resources.lock().ok()?;
let boxed_any = guard.get(&TypeId::of::<Res>())?;
let arc_res = boxed_any.as_ref().downcast_ref::<Arc<Res>>()?;
Some(GlobalResource::from(Arc::clone(arc_res)))
}
/// Get a resource by type, returning `GlobalResource<Res>` if present
pub fn res_or_route<Res: 'static + Send + Sync>(
&self,
route: ChainProcess<C>,
) -> Result<GlobalResource<Res>, ChainProcess<C>> {
match self.res() {
Some(r) => Ok(r),
None => Err(route),
}
}
/// Get a resource by type, returning `GlobalResource<Res>` or inserting a default
pub fn res_or_default<Res: 'static + Send + Sync + ResourceMarker>(
&self,
) -> GlobalResource<Res> {
self.res()
.unwrap_or_else(|| GlobalResource::from(Arc::new(Res::res_default())))
}
}
/// Global assets for storing Program global state information
pub struct GlobalResource<ResType: 'static + Send + Sync> {
res_arc: Arc<ResType>,
}
impl<ResType: 'static + Send + Sync> GlobalResource<ResType> {
/// Create a new `GlobalAsset` from an `AssetType` value.
pub fn new(res: ResType) -> Self {
Self {
res_arc: Arc::new(res),
}
}
}
impl<ResType: 'static + Send + Sync> From<Arc<ResType>> for GlobalResource<ResType> {
fn from(arc: Arc<ResType>) -> Self {
Self { res_arc: arc }
}
}
impl<ResType: 'static + Send + Sync> std::ops::Deref for GlobalResource<ResType> {
type Target = ResType;
fn deref(&self) -> &Self::Target {
&self.res_arc
}
}
impl<ResType: 'static + Send + Sync> AsRef<ResType> for GlobalResource<ResType> {
fn as_ref(&self) -> &ResType {
&self.res_arc
}
}
/// Resource marker trait, types that implement the Clone and Default traits can be considered as resources
pub trait ResourceMarker {
fn res_clone(&self) -> Self;
fn res_default() -> Self;
fn modify<C>(f: impl FnOnce(&mut Self))
where
C: ProgramCollect<Enum = C> + 'static;
}
impl<T: Default + Clone + Send + Sync + 'static> ResourceMarker for T {
fn res_clone(&self) -> Self {
Clone::clone(self)
}
fn res_default() -> Self {
Default::default()
}
fn modify<C>(f: impl FnOnce(&mut Self))
where
C: ProgramCollect<Enum = C> + 'static,
{
this::<C>().modify_res(f);
}
}
|
