python责任链模式

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u011747152/article/details/85779472

#责任链模式
#自定义请求东西，目前请求的是温度
class Request():
    def __init__(self,temprature):
        self.__temprature=temprature
    def getTemprature(self):
        return self.__temprature


class Responsible():
    def __init__(self):
        self.__nextHandler=None
    def setNextHandler(self,handler):
        self.__nextHandler=handler
    def getNextHandler(self):
        return self.__nextHandler
    def handleRequest(self,request):
        if(self.__nextHandler is not None):
            self.handleRequest(request)

class Gas(Responsible):
    def __init__(self):
        super().__init__()
    def handleRequest(self,request):
        if(request.getTemprature()>100):
            print("i'm gas")
        if(self.getNextHandler() is not None):
            self.getNextHandler().handleRequest(request)
class Liquid(Responsible):
    def __init__(self):
        super().__init__()
    def handleRequest(self,request):
        if(request.getTemprature()>0 and request.getTemprature()<100):
            print("i'm liquid")
        if(self.getNextHandler() is not None):
            self.getNextHandler().handleRequest(request)
class Water():
    def __init__(self):
        self.__leader=None
    def sendRequest(self,request):
        self.__leader.handleRequest(request)
    def setLeader(self,leader):
        self.__leader=leader


gas = Gas()
gas.setNextHandler(Liquid())
t=Water();
t.setLeader(gas)
request=Request(22)
t.sendRequest(request)

本质就Requester发送request，然后交给Responsible处理，如果有下一个责任人则继续往下传