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use crate::{tumbling, QueueCapAtLeast, TumblingOperation, TumblingOperator, TumblingWindow};
pub trait CachedOperation<I, Q: QueueCapAtLeast<LEN, Item = I>, const LEN: usize> {
type Output;
fn call(&mut self, q: &Q, new_period: bool, x: &I) -> Self::Output;
fn share_with<P>(self, op: P) -> Shared<I, Self, P>
where
P: CachedOperation<I, Q, LEN>,
Self: Sized,
{
Shared(self, op, core::marker::PhantomData::default())
}
}
impl<F, I, O, Q: QueueCapAtLeast<LEN, Item = I>, const LEN: usize> CachedOperation<I, Q, LEN> for F
where
F: FnMut(&Q, bool, &I) -> O,
{
type Output = O;
fn call(&mut self, q: &Q, new_period: bool, x: &I) -> O {
(self)(q, new_period, x)
}
}
#[derive(Debug, Clone, Copy)]
pub struct Shared<I, P1, P2>(P1, P2, core::marker::PhantomData<fn() -> I>);
impl<I, Q: QueueCapAtLeast<LEN, Item = I>, P1, P2, const LEN: usize> CachedOperation<I, Q, LEN>
for Shared<I, P1, P2>
where
P1: CachedOperation<I, Q, LEN>,
P2: CachedOperation<I, Q, LEN>,
{
type Output = (P1::Output, P2::Output);
fn call(&mut self, q: &Q, new_period: bool, x: &I) -> Self::Output {
(self.0.call(q, new_period, x), self.1.call(q, new_period, x))
}
}
#[derive(Debug, Clone, Copy)]
pub struct Cached<P>(P);
impl<I, Q: QueueCapAtLeast<LEN, Item = I>, P, const LEN: usize> TumblingOperation<I, Q, LEN>
for Cached<P>
where
P: CachedOperation<I, Q, LEN>,
{
type Output = P::Output;
fn call(&mut self, q: &Q, y: &mut Option<Q::Item>, x: I) -> Self::Output {
let new_period = y.is_none();
*y = Some(x);
self.0.call(q, new_period, y.as_ref().unwrap())
}
}
pub fn cached<M: TumblingWindow, I, Q: QueueCapAtLeast<LEN, Item = I>, P, const LEN: usize>(
mode: M,
op: P,
) -> TumblingOperator<M, Q, Cached<P>, LEN>
where
P: CachedOperation<I, Q, LEN>,
{
tumbling(mode, Cached(op))
}
#[cfg(feature = "std")]
pub mod shared_map {
use super::{CachedOperation, QueueCapAtLeast};
use std::marker::PhantomData;
use std::{collections::HashMap, hash::Hash};
#[derive(Debug, Clone)]
pub struct SharedMap<I, K, P>(HashMap<K, P>, PhantomData<fn() -> I>);
impl<I, Q: QueueCapAtLeast<LEN, Item = I>, K, P, const LEN: usize> CachedOperation<I, Q, LEN>
for SharedMap<I, K, P>
where
K: Clone + Eq + Hash,
P: CachedOperation<I, Q, LEN>,
{
type Output = HashMap<K, P::Output>;
fn call(&mut self, q: &Q, new_period: bool, x: &I) -> Self::Output {
self.0
.iter_mut()
.map(|(k, p)| (k.clone(), p.call(q, new_period, x)))
.collect()
}
}
pub fn shared<I, Q: QueueCapAtLeast<LEN, Item = I>, K, P, const LEN: usize>(
map: HashMap<K, P>,
) -> SharedMap<I, K, P>
where
K: Clone + Eq + Hash,
P: CachedOperation<I, Q, LEN>,
{
SharedMap(map, PhantomData::default())
}
}