Enum SubscriptionTarget 

pub enum SubscriptionTarget {
    Channel(UnboundedSender<Event>),
    Invocation(CommandInvocation),
    Plugin {
        plugin: u32,
        handler: u32,
        sink: PluginEventSink,
    },
}

What the bus does when a matching event arrives.

Variants

Channel(UnboundedSender<Event>)

Push the event onto an unbounded mpsc. Closed senders are pruned lazily on the next publish that hits this kind.

Invocation(CommandInvocation)

Run a [CommandInvocation] in response. v1 does NOT execute it (the bus has no document handle); instead it stores the invocation and surfaces it via EventBus::drain_pending_invocations for the App to dispatch on its turn through the actor. This keeps the bus loop-free and side-effect-free with respect to document state.

Plugin

Deliver the event to a WASM plugin’s on-event handler (PH7.8, filling the reserved slot §5.10 anticipated). The host owns the sink (over the plugin’s actor channel); the bus calls it with the lock dropped, so a slow plugin handler never delays the publisher or another subscriber. plugin / handler identify the subscription for provenance and teardown (the host unsubscribes a quarantined plugin’s ids); sink carries the delivery + the closed-receiver signal (false → prune).

Fields

plugin: u32

The host-issued plugin id (the u32 inside SourceLayer::Plugin).

handler: u32

The guest-chosen handler id, passed back to on-event(handler, ev).

sink: PluginEventSink

The delivery sink (host-owned; runs lock-dropped).

Trait Implementations

impl Clone for SubscriptionTarget

fn clone(&self) -> SubscriptionTarget

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SubscriptionTarget

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.