Python设计模式之职责链模式原理与用法实例分析

#!/usr/bin/env python# -*- coding:utf-8 -*-__author__ = 'Andy'"""大话设计模式设计模式――职责链模式职责链模式(Chain Of Responsibility):使多个对象都有机会处理请求，从而避免发送者和接收者的耦合关系。将对象连成链并沿着这条链传递请求直到被处理(在调用时要定义好哪个实例是哪个实例的职责上一级)请求沿着定义的链条传递给可以处理请求的对象"""#抽象一个处理类class Handle(object):  def __init__(self):    self.successor = ''  def setsuccessor(self, successor):    self.successor = successor  def handle_request(self,request):    pass# 具体处理者类1class ConcreteHandle1(Handle):  def handle_request(self,request):    if request>0 and request<=10:      print "ConcreteHandle1处理请求 ",request    else:      self.successor.handle_request(request)# 具体处理者类2class ConcreteHandle2(Handle):  def handle_request(self,request):    if request>10 and request<=20:      print "ConcreteHandle2处理请求 ",request    else:      self.successor.handle_request(request)if __name__=="__main__":  c1 = ConcreteHandle1()  c2 = ConcreteHandle2()  c1.setsuccessor(c2)  for i in range(6,15,2):    c1.handle_request(i)