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