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use crate::{NeverConflict, StateMachine};
use serde::de::DeserializeOwned;
use serde::{Deserialize, Serialize};
use std::fmt::Debug;
use std::rc::Rc;
#[derive(Clone, PartialEq, Debug)]
pub struct AtomRc<T> {
value: Rc<T>,
}
impl<T: Serialize> Serialize for AtomRc<T> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
self.value.serialize(serializer)
}
}
impl<'de, T: Deserialize<'de>> Deserialize<'de> for AtomRc<T> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
Ok(AtomRc {
value: Rc::new(T::deserialize(deserializer)?),
})
}
}
impl<T: PartialEq + Debug> AtomRc<T> {
pub fn new(initial: T) -> Self {
AtomRc {
value: Rc::new(initial),
}
}
pub fn value(&self) -> &T {
&self.value
}
pub fn replace(&self, replacement: T) -> ReplaceAtomRc<T> {
ReplaceAtomRc(Rc::new(replacement))
}
}
#[derive(Clone, PartialEq, Debug)]
pub struct ReplaceAtomRc<T: PartialEq + Debug>(Rc<T>);
impl<T: Serialize + Debug + PartialEq> Serialize for ReplaceAtomRc<T> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
self.0.serialize(serializer)
}
}
impl<'de, T: Deserialize<'de> + Debug + PartialEq> Deserialize<'de> for ReplaceAtomRc<T> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
Ok(ReplaceAtomRc(Rc::new(T::deserialize(deserializer)?)))
}
}
impl<T: Debug + Clone + Serialize + DeserializeOwned + PartialEq + 'static> StateMachine
for AtomRc<T>
{
type Transition = ReplaceAtomRc<T>;
type Conflict = NeverConflict;
fn apply(&self, transition_event: &Self::Transition) -> Result<Self, NeverConflict> {
let ReplaceAtomRc(v) = transition_event;
Ok(AtomRc { value: v.clone() })
}
}
impl<T: Default + PartialEq + Debug> Default for AtomRc<T> {
fn default() -> Self {
AtomRc::new(Default::default())
}
}