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//! Generate events asynchronously for you application.
/// An event subscription.
pub struct Subscription<T> {
handles: Vec<Box<dyn Handle<Output = T>>>,
}
impl<T> Subscription<T> {
pub fn none() -> Self {
Self {
handles: Vec::new(),
}
}
pub fn batch(subscriptions: impl Iterator<Item = Subscription<T>>) -> Self {
Self {
handles: subscriptions
.flat_map(|subscription| subscription.handles)
.collect(),
}
}
pub fn handles(self) -> Vec<Box<dyn Handle<Output = T>>> {
self.handles
}
}
impl<T, A> From<A> for Subscription<T>
where
A: Handle<Output = T> + 'static,
{
fn from(handle: A) -> Self {
Self {
handles: vec![Box::new(handle)],
}
}
}
/// The handle of an event subscription.
pub trait Handle {
type Output;
fn id(&self) -> u64;
fn stream(&self) -> futures::stream::BoxStream<'static, Self::Output>;
}
impl<T> std::fmt::Debug for Subscription<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Subscription").finish()
}
}
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