handle_event#

langchain_core.callbacks.manager.handle_event(handlers: List[BaseCallbackHandler], event_name: str, ignore_condition_name: str | None, *args: Any, **kwargs: Any) → None[source]#

Generic event handler for CallbackManager.

Note: This function is used by LangServe to handle events.

Parameters:

  • handlers (List[BaseCallbackHandler]) – The list of handlers that will handle the event.

  • event_name (str) – The name of the event (e.g., “on_llm_start”).

  • ignore_condition_name (str | None) – Name of the attribute defined on handler that if True will cause the handler to be skipped for the given event.

  • *args (Any) – The arguments to pass to the event handler.

  • **kwargs (Any) – The keyword arguments to pass to the event handler

Return type:

None