Function _update_background_callback

dash/_callback.py:486–519

Set up the background callback and manage jobs.

(
    error_handler,
    callback_ctx,
    response,
    kwargs,
    background,
    multi,
    cache_key=None,
    job_id=None,
)

def _update_background_callback(
    error_handler,
    callback_ctx,
    response,
    kwargs,
    background,
    multi,
    cache_key=None,
    job_id=None,
):
    """Set up the background callback and manage jobs."""
    callback_manager = _get_callback_manager(kwargs, background)

    if cache_key is None or job_id is None:
        adapter = get_app().backend.request_adapter()
        cache_key = cache_key or (adapter.args.get("cacheKey") if adapter else None)
        job_id = job_id or (adapter.args.get("job") if adapter else None)

    _progress_background_callback(
        response, callback_manager, background, cache_key=cache_key
    )

    output_value = callback_manager.get_result(cache_key, job_id)

    return _handle_rest_background_callback(
        output_value,
        callback_manager,
        response,
        error_handler,
        callback_ctx,
        multi,
        cache_key=cache_key,
        job_id=job_id,
    )


def _handle_rest_background_callback(