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

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Constructor params

None.

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Setup with EventBus

from abxbus import EventBus
from abxbus.middlewares import AutoHandlerChangeEventMiddleware

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

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Behavior

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