AutoHandlerChangeEventMiddleware - abxbus

AutoHandlerChangeEventMiddleware emits metadata events whenever EventBus.on(...) or EventBus.off(...) changes handler registration.

Constructor params

None.

Setup with EventBus

Python
Rust

from abxbus import EventBus
from abxbus.middlewares import AutoHandlerChangeEventMiddleware

bus = EventBus(
    name='AppBus',
    middlewares=[AutoHandlerChangeEventMiddleware()],
)

// Not implemented in the Rust crate yet.
// Use explicit typed handler wrappers around bus.on(...) for this behavior for now.

Behavior

On registration, emits BusHandlerRegisteredEvent(handler=...).
On unregistration, emits BusHandlerUnregisteredEvent(handler=...).
Emits a deep-copied handler metadata object.
Useful for auditing dynamic handler topology.