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//! Installer trait for event source installation.
use crateWorldBuilder;
/// Install-time trait for event sources.
///
/// An installer registers its resources into [`WorldBuilder`] and returns a
/// concrete poller. The poller is a thin struct of pre-resolved
/// [`ResourceId`](crate::ResourceId)s — it knows how to reach into
/// [`World`](crate::World) but owns nothing.
///
/// Each poller defines its own `poll()` signature. This is intentional:
/// different drivers need different parameters (e.g. a timer driver
/// needs `Instant`, an IO driver does not).
///
/// # Examples
///
/// ```ignore
/// struct IoInstaller { capacity: usize }
///
/// struct IoPoller {
/// poller_id: ResourceId,
/// events_id: ResourceId,
/// }
///
/// impl Installer for IoInstaller {
/// type Poller = IoPoller;
///
/// fn install(self, world: &mut WorldBuilder) -> IoPoller {
/// let poller_id = world.register(Poller::new());
/// let events_id = world.register(MioEvents::with_capacity(self.capacity));
/// IoPoller { poller_id, events_id }
/// }
/// }
///
/// // Poller has its own poll signature — NOT a trait method.
/// impl IoPoller {
/// fn poll(&mut self, world: &mut World) {
/// // get resources via pre-resolved IDs, poll mio, dispatch
/// }
/// }
///
/// let mut wb = WorldBuilder::new();
/// let io = wb.install_driver(IoInstaller { capacity: 1024 });
/// let mut world = wb.build();
///
/// loop {
/// io.poll(&mut world);
/// }
/// ```