singleton map

This commit is contained in:
Michael Sippel 2021-06-16 02:56:11 +02:00
parent 835a0bf08e
commit 8e36e1c2fd
Signed by: senvas
GPG key ID: F96CF119C34B64A6
2 changed files with 85 additions and 0 deletions

View file

@ -0,0 +1,84 @@
use {
std::sync::Arc,
std::sync::RwLock,
crate::{
singleton::{SingletonView},
core::{
Observer, ObserverExt, ObserverBroadcast,
View, ViewPort, OuterViewPort
}
}
};
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
impl<Item: 'static> OuterViewPort<dyn SingletonView<Item = Item>> {
pub fn map<
DstItem: 'static,
F: Fn(Item) -> DstItem + Send + Sync + 'static
>(
&self,
f: F
) -> OuterViewPort<dyn SingletonView<Item = DstItem>> {
let port = ViewPort::new();
port.add_update_hook(Arc::new(self.0.clone()));
let map = Arc::new(RwLock::new(MapSingleton {
src_view: None,
f,
cast: port.inner().get_broadcast()
}));
self.add_observer(map.clone());
port.inner().set_view(Some(map));
port.into_outer()
}
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
pub struct MapSingleton<DstItem, SrcView, F>
where SrcView: SingletonView + ?Sized,
F: Fn(SrcView::Item) -> DstItem + Send + Sync
{
src_view: Option<Arc<SrcView>>,
f: F,
cast: Arc<RwLock<ObserverBroadcast<dyn SingletonView<Item = DstItem>>>>
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
impl<DstItem, SrcView, F> View for MapSingleton<DstItem, SrcView, F>
where SrcView: SingletonView + ?Sized,
F: Fn(SrcView::Item) -> DstItem + Send + Sync
{
type Msg = ();
}
impl<DstItem, SrcView, F> SingletonView for MapSingleton<DstItem, SrcView, F>
where SrcView: SingletonView + ?Sized,
F: Fn(SrcView::Item) -> DstItem + Send + Sync
{
type Item = DstItem;
fn get(&self) -> DstItem {
(self.f)(self.src_view.as_ref().unwrap().get())
}
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
impl<DstItem, SrcView, F> Observer<SrcView> for MapSingleton<DstItem, SrcView, F>
where SrcView: SingletonView + ?Sized,
F: Fn(SrcView::Item) -> DstItem + Send + Sync
{
fn reset(&mut self, view: Option<Arc<SrcView>>) {
self.src_view = view;
self.cast.notify(&());
}
fn notify(&mut self, msg: &()) {
self.cast.notify(msg);
}
}

View file

@ -1,5 +1,6 @@
pub mod buffer; pub mod buffer;
pub mod map;
use { use {
std::{ std::{