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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| use std::{cell::RefCell, rc::Rc}; | ||
|
|
||
| pub struct RunAllocator { | ||
| free_slots: Vec<usize>, | ||
| total_spawned: usize, | ||
| active: usize, | ||
| allocated: usize, | ||
| } | ||
|
|
||
| impl RunAllocator { | ||
| pub fn new() -> Self { | ||
| Self { free_slots: vec![], total_spawned: 0, active: 0, allocated: 0 } | ||
| } | ||
|
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||
| pub fn allocate(&mut self) -> RunIndex { | ||
| let slot = self.free_slots.pop().unwrap_or_else(|| { | ||
| self.allocated += 1; | ||
| self.allocated - 1 | ||
| }); | ||
| self.active += 1; | ||
| self.total_spawned += 1; | ||
| RunIndex { muid: self.total_spawned - 1, slot } | ||
| } | ||
|
|
||
| pub fn deallocate(&mut self, idx: RunIndex) { | ||
| self.free_slots.push(idx.slot); | ||
| self.active -= 1; | ||
| } | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct RunIndex { | ||
| pub(crate) muid: usize, | ||
| pub(crate) slot: usize, | ||
| } | ||
|
|
||
| struct CuratedSlot<T> { | ||
| value: T, | ||
| muid: usize, | ||
| } | ||
|
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||
| #[derive(Clone)] | ||
| pub struct InnerValue<T: Clone> { | ||
| data: Rc<RefCell<Vec<Option<CuratedSlot<T>>>>> | ||
| } | ||
|
|
||
| impl<T: Clone> InnerValue<T> { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| data: Rc::new(RefCell::new(vec![])), | ||
| } | ||
| } | ||
|
|
||
| pub fn get(&self, idx: &RunIndex) -> Option<T> { | ||
| match self.data.borrow().get(idx.slot) { | ||
| Some(opt) => match opt { | ||
| Some(CuratedSlot{value, muid}) => match muid == &idx.muid { | ||
| true => Some(value.clone()), | ||
| false => match muid < &idx.muid { | ||
| true => None, | ||
| false => panic!("Accessing value with muid {} by idx: {:?}", muid, idx), | ||
| }, | ||
| }, | ||
| None => None, | ||
| }, | ||
| None => None, | ||
| } | ||
|
|
||
| } | ||
|
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||
| pub fn set(&self, idx: &RunIndex, value: T) { | ||
| assert!(self.replace(idx, value).is_none(), "Attempting to set value by idx: {:?}, but is already set", idx) | ||
| } | ||
|
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||
| #[must_use = "if you intended to set a value, consider `set` method instead"] | ||
| pub fn replace(&self, idx: &RunIndex, value: T) -> Option<T> { | ||
| let mut data = self.data.borrow_mut(); | ||
| if data.len() <= idx.slot { | ||
| data.resize_with(idx.slot + 1, || None); | ||
| } | ||
| match data[idx.slot] { | ||
| Some(CuratedSlot{muid, value: _}) => assert!(muid <= idx.muid, "Writing value with muid {} by idx: {:?}", muid, idx), | ||
| None => (), | ||
| } | ||
| data[idx.slot].replace(CuratedSlot { value: value.clone(), muid: idx.muid }).and_then(|CuratedSlot{value, muid}| if muid == idx.muid {Some(value)} else {None}) | ||
| } | ||
| } | ||
|
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||
|
|
||
| #[test] | ||
| fn normal_usage() { | ||
| let x = InnerValue::new(); | ||
|
|
||
| x.set(&RunIndex { muid: 0, slot: 0 }, 0); | ||
| x.set(&RunIndex { muid: 1, slot: 1 }, 1); | ||
| x.set(&RunIndex { muid: 2, slot: 2 }, 2); | ||
| assert_eq!(x.get(&RunIndex { muid: 0, slot: 0 }), Some(0)); | ||
| assert_eq!(x.get(&RunIndex { muid: 1, slot: 1 }), Some(1)); | ||
| assert_eq!(x.get(&RunIndex { muid: 2, slot: 2 }), Some(2)); | ||
| assert_eq!(x.get(&RunIndex { muid: 3, slot: 0 }), None); | ||
| x.set(&RunIndex { muid: 3, slot: 0 }, 3); | ||
| assert_eq!(x.get(&RunIndex { muid: 3, slot: 0 }), Some(3)); | ||
| assert_eq!(x.replace(&RunIndex { muid: 1, slot: 1 }, 5), Some(1)) | ||
| } | ||
|
|
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