職責鏈模式(python)

職責鏈模式：將能處理請求的對象連成一條鏈，並沿著這條鏈傳遞該請求，直到有一個對象處理請求為止，避免請求的寄件者和接收者之間的耦合關係。

#encoding=utf-8##by panda#職責連模式def printInfo(info):    print unicode(info, 'utf-8').encode('gbk')#抽象職責類class Manager():    successor = None    name = ''    def __init__(self, name):        self.name = name        def SetSuccessor(self, successor):        self.successor = successor        def HandleRequest(self, request):        pass#具體職責類：經理class CommonManager(Manager):    def HandleRequest(self, request):        if request.RequestType == '請假' and request.Number <= 2:            printInfo('%s:%s 數量%d 被批准' % (self.name, request.RequestContent, request.Number))        else:            if self.successor != None:                self.successor.HandleRequest(request)                #具體職責類：總監class Majordomo(Manager):    def HandleRequest(self, request):        if request.RequestType == '請假' and request.Number <= 5:            printInfo('%s:%s 數量%d 被批准' % (self.name, request.RequestContent, request.Number))        else:            if self.successor != None:                self.successor.HandleRequest(request)#具體職責類：總經理class GeneralManager(Manager):    def HandleRequest(self, request):        if request.RequestType == '請假':            printInfo('%s:%s 數量%d 被批准' % (self.name, request.RequestContent, request.Number))        elif request.RequestType == '加薪' and request.Number <= 500:            printInfo('%s:%s 數量%d 被批准' % (self.name, request.RequestContent, request.Number))        elif request.RequestType == '加薪' and request.Number > 500:            printInfo('%s:%s 數量%d 再說吧' % (self.name, request.RequestContent, request.Number))class Request():    RequestType = ''    RequestContent = ''    Number = 0def clientUI():    jinLi = CommonManager('金力')    zongJian = Majordomo('宗健')    zhongJingLi = GeneralManager('鐘金利')        jinLi.SetSuccessor(zongJian)    zongJian.SetSuccessor(zhongJingLi)        request = Request()    request.RequestType = '請假'    request.RequestContent = '小菜請假'    request.Number = 1    jinLi.HandleRequest(request)        request.RequestType = '請假'    request.RequestContent = '小菜請假'    request.Number = 5    jinLi.HandleRequest(request)        request.RequestType = '加薪'    request.RequestContent = '小菜要求加薪'    request.Number = 500    jinLi.HandleRequest(request)        request.RequestType = '加薪'    request.RequestContent = '小菜要求加薪'    request.Number = 1000    jinLi.HandleRequest(request)    returnif __name__ == '__main__':    clientUI();

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