technofab/aerosol
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Implement statically required resources

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Diggory Blake 2023-08-03 19:56:48 +01:00
parent 3d7c0bed49
commit a5395a5d33
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GPG key ID: E6BDFA83146ABD40
9 changed files with 195 additions and 56 deletions
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10
src/sync_constructible.rs
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@ -1,5 +1,7 @@
use std::{any::Any, sync::Arc};
use frunk::prelude::HList;
use crate::{
resource::{unwrap_constructed, Resource},
slot::SlotDesc,
@ -90,14 +92,14 @@ impl_constructible! {
pub trait ConstructibleResource: Resource + IndirectlyConstructible {}
impl<T: Resource + IndirectlyConstructible> ConstructibleResource for T {}
impl Aerosol {
impl<R: HList> Aerosol<R> {
/// Try to get or construct an instance of `T`.
pub fn try_obtain<T: ConstructibleResource>(&self) -> Result<T, T::Error> {
match self.try_get_slot() {
Some(SlotDesc::Filled(x)) => Ok(x),
Some(SlotDesc::Placeholder) | None => match self.wait_for_slot::<T>(true) {
Some(x) => Ok(x),
None => match T::construct(self) {
None => match T::construct(self.as_ref()) {
Ok(x) => {
self.fill_placeholder::<T>(x.clone());
Ok(x)
@ -118,7 +120,7 @@ impl Aerosol {
pub fn try_init<T: ConstructibleResource>(&self) -> Result<(), T::Error> {
match self.wait_for_slot::<T>(true) {
Some(_) => Ok(()),
None => match T::construct(self) {
None => match T::construct(self.as_ref()) {
Ok(x) => {
self.fill_placeholder::<T>(x);
Ok(())
@ -264,6 +266,6 @@ mod tests {
fn obtain_impl() {
let state = Aerosol::new();
state.init::<Arc<DummyImpl>>();
state.get::<Arc<dyn DummyTrait>>();
state.try_get::<Arc<dyn DummyTrait>>().unwrap();
}
}