class_docstr: Manage background execution of callbacks with a celery queue.
class_docstr_tok: ["Manage","background","execution","of","callbacks","with","a","celery","queue","."]
code: def call_job_fn(self, key, job_fn, args, context):
      task = job_fn.delay(
          key, self._make_progress_key(key), args, context
      )
      return task.task_id
  
imports: import json
  import traceback
  from contextvars import copy_context
  from _plotly_utils.utils import PlotlyJSONEncoder
  from dash._callback_context import context_value
  from dash._utils import AttributeDict
  from dash.exceptions import PreventUpdate
  from dash.long_callback.managers import BaseLongCallbackManager
label_desc: Use image node_id 8 for calling the CeleryManager obj's underlying member method code with example usage: obj.call_job_fn(key, job_fn, args, context) and returns: task