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python-設計模式-觀察器模式

python
設計模式
觀察器模式


class Subject: 
   def __init__(self): 
      self.State = '' 
      self.OList = [] 
   def GetState(self): 
      return self.State 
   def SetState(self, state): 
      self.State = state 
      self.NotifyObeservers() 
   def AddObeserver(self,observer): 
      self.OList.append(observer) 
   def RemoveObeserver(self,observer): 
      self.OList.remove(observer) 
   def NotifyObeservers(self): 
      for O in self.OList: 
         O.Update() 

 class Observer: 
   def __init__(self,name,subject): 
      self.name = name 
      self.Subject = subject 
   def Update(self): 
      print(self.name,self.Subject.GetState()) 

 S1 = Subject() 

 O1 = Observer('O1',S1) 
O2 = Observer('O2',S1) 

S1.AddObeserver(O1) 
S1.AddObeserver(O2) 

 S1.SetState('Update') 
S1.SetState('Update2')
S1.SetState('Update3')

程式碼說明

定義被觀察者，在定義觀察者，建立被觀察者，建立觀察者，把被觀察者方方入觀察者，把觀察者方入被觀察者中的觀察清單，概念狀態，改變時，則會通知狀態更新。
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