148 lines
3.4 KiB
Rust
148 lines
3.4 KiB
Rust
use {
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crate::core::View,
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std::{
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sync::{Arc, Weak}
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},
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std::sync::RwLock
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};
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/*\
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<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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Observer
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<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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\*/
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pub trait Observer<V: View + ?Sized> : Send + Sync {
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fn reset(&mut self, _view: Option<Arc<V>>) {}
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fn notify(&self, msg: &V::Msg);
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<V: View + ?Sized, O: Observer<V>> Observer<V> for Arc<RwLock<O>> {
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fn reset(&mut self, view: Option<Arc<V>>) {
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self.write().unwrap().reset(view);
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}
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fn notify(&self, msg: &V::Msg) {
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self.read().unwrap().notify(&msg);
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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pub trait ObserverExt<V: View + ?Sized> : Observer<V> {
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fn notify_each(&self, it: impl IntoIterator<Item = V::Msg>);
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}
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impl<V: View + ?Sized, T: Observer<V>> ObserverExt<V> for T {
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fn notify_each(&self, it: impl IntoIterator<Item = V::Msg>) {
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for msg in it {
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self.notify(&msg);
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}
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}
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}
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/*\
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<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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Broadcast
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<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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\*/
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pub struct ObserverBroadcast<V: View + ?Sized> {
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observers: Vec<Weak<RwLock<dyn Observer<V>>>>
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}
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impl<V: View + ?Sized> ObserverBroadcast<V> {
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pub fn new() -> Self {
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ObserverBroadcast {
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observers: Vec::new()
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}
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}
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pub fn add_observer(&mut self, obs: Weak<RwLock<dyn Observer<V>>>) {
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self.cleanup();
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self.observers.push(obs);
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}
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fn cleanup(&mut self) {
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self.observers.retain(|o| o.strong_count() > 0);
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}
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fn iter(&self) -> impl Iterator<Item = Arc<RwLock<dyn Observer<V>>>> + '_ {
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self.observers.iter().filter_map(|o| o.upgrade())
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}
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}
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impl<V: View + ?Sized> Observer<V> for ObserverBroadcast<V> {
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fn reset(&mut self, view: Option<Arc<V>>) {
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for o in self.iter() {
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o.write().unwrap().reset(view.clone());
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}
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}
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fn notify(&self, msg: &V::Msg) {
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for o in self.iter() {
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o.read().unwrap().notify(&msg);
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}
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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pub struct NotifyFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(&V::Msg) + Send + Sync {
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f: F,
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_phantom: std::marker::PhantomData<V>
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}
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impl<V, F> NotifyFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(&V::Msg) + Send + Sync {
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pub fn new(f: F) -> Self {
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NotifyFnObserver {
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f,
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_phantom: std::marker::PhantomData
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}
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}
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}
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impl<V, F> Observer<V> for NotifyFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(&V::Msg) + Send + Sync {
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fn notify(&self, msg: &V::Msg) {
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(self.f)(msg);
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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pub struct ResetFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(Option<Arc<V>>) + Send + Sync {
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f: F,
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_phantom: std::marker::PhantomData<V>
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}
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impl<V, F> ResetFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(Option<Arc<V>>) + Send + Sync {
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pub fn new(f: F) -> Self {
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ResetFnObserver {
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f,
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_phantom: std::marker::PhantomData
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}
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}
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}
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impl<V, F> Observer<V> for ResetFnObserver<V, F>
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where V: View + ?Sized,
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F: Fn(Option<Arc<V>>) + Send + Sync {
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fn notify(&self, _msg: &V::Msg) {}
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fn reset(&mut self, view: Option<Arc<V>>) {
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(self.f)(view);
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}
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}
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