code: def execute(cls, instance, async=True, countdown=2, is_heavy_task=False, **kwargs):
          
          cls.pre_apply(instance, async=async, **kwargs)
          result = cls.apply_signature(instance, async=async, countdown=countdown,
                                       is_heavy_task=is_heavy_task, **kwargs)
          cls.post_apply(instance, async=async, **kwargs)
          return result
docs: Execute high level-operation