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use std::any::TypeId; use std::sync::{ atomic::{AtomicPtr, AtomicUsize, Ordering}, Arc, }; use colored::Colorize; use log::debug; use futures::channel::mpsc::UnboundedSender; use crate::component::{Component, ComponentTask}; pub struct Scope<C: Component> { name: &'static str, muted: Arc<AtomicUsize>, channel: UnboundedSender<C::Message>, } impl<C: Component> Scope<C> { pub(crate) fn new(name: &'static str, channel: UnboundedSender<C::Message>) -> Self { Scope { name, muted: Default::default(), channel, } } } impl<C: Component> Clone for Scope<C> { fn clone(&self) -> Self { Scope { name: self.name, muted: self.muted.clone(), channel: self.channel.clone(), } } } impl<C: 'static + Component> Scope<C> { pub(crate) fn inherit<Child: Component>( &self, name: &'static str, channel: UnboundedSender<Child::Message>, ) -> Scope<Child> { Scope { name, muted: self.muted.clone(), channel, } } pub(crate) fn is_muted(&self) -> bool { self.muted.load(Ordering::SeqCst) > 0 } pub(crate) fn mute(&self) { self.muted.fetch_add(1, Ordering::SeqCst); } pub(crate) fn unmute(&self) { self.muted.fetch_sub(1, Ordering::SeqCst); } pub(crate) fn current_parent() -> Self { ComponentTask::<_, C>::current_parent_scope() } pub fn send_message(&self, msg: C::Message) { debug!( "{} {}: {}", format!( "Scope::send_message{}", if self.is_muted() { " [muted]" } else { "" } ) .green(), self.name.magenta().bold(), format!("{:?}", msg).bright_white().bold() ); if !self.is_muted() { self.channel .unbounded_send(msg) .expect("unable to send message to unbounded channel!") } } pub fn name(&self) -> &str { &self.name } } pub(crate) struct AnyScope { type_id: TypeId, ptr: AtomicPtr<()>, drop: Box<dyn Fn(&mut AtomicPtr<()>) + Send>, } impl<C: 'static + Component> From<Scope<C>> for AnyScope { fn from(scope: Scope<C>) -> Self { let ptr = AtomicPtr::new(Box::into_raw(Box::new(scope)) as *mut ()); let drop = |ptr: &mut AtomicPtr<()>| { let ptr = ptr.swap(std::ptr::null_mut(), Ordering::SeqCst); if !ptr.is_null() { #[allow(unsafe_code)] let scope = unsafe { Box::from_raw(ptr as *mut Scope<C>) }; std::mem::drop(scope) } }; AnyScope { type_id: TypeId::of::<C::Properties>(), ptr, drop: Box::new(drop), } } } impl Drop for AnyScope { fn drop(&mut self) { (self.drop)(&mut self.ptr) } } impl AnyScope { pub(crate) fn try_get<C: 'static + Component>(&self) -> Option<&'static Scope<C>> { if TypeId::of::<C::Properties>() == self.type_id { #[allow(unsafe_code)] unsafe { (self.ptr.load(Ordering::Relaxed) as *const Scope<C>).as_ref() } } else { None } } }