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

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