app/DB/baseorm.py

   1 import abc
   2
   3 class OrmSubject(metaclass=abc.ABCMeta):
   4     @abc.abstractmethod
   5     def addObserver(self, ormObserver):
   6         pass
   7
   8     @abc.abstractmethod
   9     def removeObserver(self, ormObserver):
  10         pass
  11
  12     @abc.abstractmethod
  13     def notify(self, subject):
  14         pass
  15
  16 class Observer(metaclass=abc.ABCMeta):
  17     @abc.abstractmethod
  18     def update(self, subject):
  19         pass
  20
  21 class BaseOrm(OrmSubject):
  22
  23     def __init__(self):
  24         self.__observers = []
  25
  26     def addObserver(self, ormObserver):
  27         print("Added: {0}".format(ormObserver))
  28         self.__observers.append(ormObserver)
  29
  30     def removeObserver(self, ormObserver):
  31         self.__observers.remove(ormObserver)
  32
  33     def notify(self, object):
  34         for observer in self.__observers:
  35             observer.update(object)
  36
  37     @property
  38     def id(self):
  39         return self.__id
  40
  41     @id.setter
  42     def id(self, id):
  43         notify = True
  44         try:
  45             old = self.id
  46             notify = False
  47         except AttributeError as e:
  48             pass
  49 #            print(e)
  50 #            notify = False
  51         self.__id = id
  52         if notify:
  53             self.notify(self)