code: def notify(self, name, job):
          
          for observer in self._observers:
              observer.update(name, job)
docs: Concrete method of Subject.notify().
          Notify to change the status of Subject for observer.
          This method call Observer.update().
          In this program, ConfigReader.notify() call JobObserver.update().
          For exmaple, register threads.redis.ConcreateJob to JobObserver.jobs.