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|
use std::{collections::HashMap, ops::{Deref, DerefMut}, sync::{Arc, RwLock}};
use leptos::prelude::*;
use tracing::debug;
// TODO: get rid of this
// V has to be an arc signal
#[derive(Debug)]
pub struct ArcStateStore<K, V> {
store: Arc<RwLock<HashMap<K, (ArcRwSignal<V>, usize)>>>,
}
impl<K, V> PartialEq for ArcStateStore<K, V> {
fn eq(&self, other: &Self) -> bool {
Arc::ptr_eq(&self.store, &other.store)
}
}
impl<K, V> Clone for ArcStateStore<K, V> {
fn clone(&self) -> Self {
Self {
store: Arc::clone(&self.store),
}
}
}
impl<K, V> Eq for ArcStateStore<K, V> {}
impl<K, V> ArcStateStore<K, V> {
pub fn new() -> Self {
Self {
store: Arc::new(RwLock::new(HashMap::new())),
}
}
}
#[derive(Debug)]
pub struct StateStore<K, V, S = SyncStorage> {
inner: ArenaItem<ArcStateStore<K, V>, S>,
}
impl<K, V, S> Dispose for StateStore<K, V, S> {
fn dispose(self) {
self.inner.dispose()
}
}
impl<K, V> StateStore<K, V>
where
K: Send + Sync + 'static,
V: Send + Sync + 'static,
{
pub fn new() -> Self {
Self::new_with_storage()
}
}
impl<K, V, S> StateStore<K, V, S>
where
K: 'static,
V: 'static,
S: Storage<ArcStateStore<K, V>>,
{
pub fn new_with_storage() -> Self {
Self {
inner: ArenaItem::new_with_storage(ArcStateStore::new()),
}
}
}
impl<K, V> StateStore<K, V, LocalStorage>
where
K: 'static,
V: 'static,
{
pub fn new_local() -> Self {
Self::new_with_storage()
}
}
impl<
K: std::marker::Send + std::marker::Sync + 'static,
V: std::marker::Send + std::marker::Sync + 'static,
> From<ArcStateStore<K, V>> for StateStore<K, V>
{
fn from(value: ArcStateStore<K, V>) -> Self {
Self {
inner: ArenaItem::new_with_storage(value),
}
}
}
impl<K: 'static, V: 'static> FromLocal<ArcStateStore<K, V>> for StateStore<K, V, LocalStorage> {
fn from_local(value: ArcStateStore<K, V>) -> Self {
Self {
inner: ArenaItem::new_with_storage(value),
}
}
}
impl<K, V, S> Copy for StateStore<K, V, S> {}
impl<K, V, S> Clone for StateStore<K, V, S> {
fn clone(&self) -> Self {
*self
}
}
impl<K: Eq + std::hash::Hash + Clone + std::fmt::Debug, V: Clone + std::fmt::Debug> StateStore<K, V>
where
K: Send + Sync + 'static,
V: Send + Sync + 'static,
{
pub fn store(&self, key: K, value: V) -> StateListener<K, V> {
{
let store = self.inner.try_get_value().unwrap();
let mut store = store.store.write().unwrap();
debug!("store state: {:?}", store);
if let Some((v, count)) = store.get_mut(&key) {
debug!("updating old value already in store");
v.set(value);
*count += 1;
StateListener {
value: v.clone(),
cleaner: StateCleaner {
key,
state_store: self.clone(),
},
}
} else {
let v = ArcRwSignal::new(value);
store.insert(key.clone(), (v.clone(), 1));
debug!("inserting new value: {:?}", store);
StateListener {
value: v.into(),
cleaner: StateCleaner {
key,
state_store: self.clone(),
},
}
}
}
}
}
impl<K, V> StateStore<K, V>
where
K: Eq + std::hash::Hash + Send + Sync + 'static,
V: Send + Sync + 'static,
{
pub fn update(&self, key: &K, value: V) {
let store = self.inner.try_get_value().unwrap();
let mut store = store.store.write().unwrap();
if let Some((v, _)) = store.get_mut(key) {
v.set(value)
}
}
pub fn modify(&self, key: &K, modify: impl Fn(&mut V)) {
let store = self.inner.try_get_value().unwrap();
let mut store = store.store.write().unwrap();
if let Some((v, _)) = store.get_mut(key) {
v.update(|v| modify(v));
}
}
fn remove(&self, key: &K) {
// let store = self.inner.try_get_value().unwrap();
// let mut store = store.store.write().unwrap();
// if let Some((_v, count)) = store.get_mut(key) {
// *count -= 1;
// if *count == 0 {
// store.remove(key);
// debug!("dropped item from store");
// }
// }
}
}
#[derive(Clone)]
pub struct StateListener<K, V>
where
K: Eq + std::hash::Hash + 'static + std::marker::Send + std::marker::Sync,
V: 'static + std::marker::Send + std::marker::Sync,
{
value: ArcRwSignal<V>,
cleaner: StateCleaner<K, V>,
}
impl<
K: std::cmp::Eq + std::hash::Hash + std::marker::Send + std::marker::Sync,
V: std::marker::Send + std::marker::Sync,
> Deref for StateListener<K, V>
{
type Target = ArcRwSignal<V>;
fn deref(&self) -> &Self::Target {
&self.value
}
}
impl<K: std::cmp::Eq + std::hash::Hash + Send + Sync, V: Send + Sync> DerefMut
for StateListener<K, V>
{
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.value
}
}
struct ArcStateCleaner<K, V> {
key: K,
state_store: ArcStateStore<K, V>,
}
struct StateCleaner<K, V>
where
K: Eq + std::hash::Hash + Send + Sync + 'static,
V: Send + Sync + 'static,
{
key: K,
state_store: StateStore<K, V>,
}
impl<K, V> Clone for StateCleaner<K, V>
where
K: Eq + std::hash::Hash + Clone + Send + Sync,
V: Send + Sync,
{
fn clone(&self) -> Self {
{
let store = self.state_store.inner.try_get_value().unwrap();
let mut store = store.store.write().unwrap();
if let Some((_v, count)) = store.get_mut(&self.key) {
*count += 1;
}
}
Self {
key: self.key.clone(),
state_store: self.state_store.clone(),
}
}
}
impl<K: Eq + std::hash::Hash + Send + Sync + 'static, V: Send + Sync + 'static> Drop
for StateCleaner<K, V>
{
fn drop(&mut self) {
self.state_store.remove(&self.key);
}
}
|
