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