设计模式之十三--职责链模式
【设计模式之十三--职责链模式】职责链模式：是多个对象都有机会处理请求，从而避免请求的法总这和接收者之间的耦合关系。将这个对象连成一条链，并沿着这条链传递该请求，知道有一个对象处理它为止。
这个模式在公司中非常常见，一个人请假，先从自己的leader开始，然后进一步到科长，总经理。职责链条非常清晰。
from abc import ABCMeta, abstractmethodclass Manager(metaclass=ABCMeta):def __init__(self, name):
self.name = name
self._supervisor = None@abstractmethod
def set_supervisor(self, supervisor):
pass@abstractmethod
def handle_request(self, request):
passclass Leader(Manager):def __init__(self, name):
self.supervisor = None
super().__init__(name)def set_supervisor(self, supervisor):
self.supervisor = supervisordef handle_request(self, request):
if request.request_type is "day_off" and request.number < 2:
print("{0}:{1} number {2} is approved".format(self.name, request.request_content, request.number))else:
if self.supervisor is not None:
self.supervisor.handle_request(request)class SectionChief(Manager):def __init__(self, name):
self.supervisor = None
super().__init__(name)def set_supervisor(self, supervisor):
self.supervisor = supervisordef handle_request(self, request):
if request.request_type is "day_off" and request.number < 5:
print("{0}:{1} number {2} is approved".format(self.name, request.request_content, request.number))
else:
if self.supervisor is not None:
self.supervisor.handle_request(request)class GeneralManager(Manager):def __init__(self, name):
self.supervisor = None
super().__init__(name)def set_supervisor(self, supervisor):
self.supervisor = supervisordef handle_request(self, request):
if request.request_type is "salary_increase" and request.number < 1000:
print("{0}:{1} number {2} is approved".format(self.name, request.request_content, request.number))
else:
print("{0}:{1} number {2} is not approved".format(self.name, request.request_content, request.number))class Request:
def __init__(self):
self.__request_type = None
self.__request_content = None
self.__number = None@property
def request_type(self):
return self.__request_type@request_type.setter
def request_type(self, value):
self.__request_type = value@property
def request_content(self):
return self.__request_content@request_content.setter
def request_content(self, value):
self.__request_content = value@property
def number(self):
return self.__number@number.setter
def number(self, value):
self.__number = valueif __name__ == "__main__":
leader = Leader("Jordon")
section_chief = SectionChief("Martin")
general_manager = GeneralManager("Dell")leader.set_supervisor(section_chief)
section_chief.set_supervisor(general_manager)request = Request()
request.request_type = "day_off"
request.request_content = "Li ask day off"
request.number = 4
leader.handle_request(request)request = Request()
request.request_type = "salary_increase"
request.request_content = "Li ask for salary increase"
request.number = 1200leader.handle_request(request)
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