Python-Design-Patterns front_controller
front_controller Model
Python-Design-Patterns front_controller
# file: 'front_controller.py'
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
@author: Gordeev Andrey <gordeev.and.and@gmail.com>
*TL;DR80
Provides a centralized entry point that controls and manages request handling.
"""
class MobileView(object):
def show_index_page(self):
print('Displaying mobile index page')
class TabletView(object):
def show_index_page(self):
print('Displaying tablet index page')
class Dispatcher(object):
def __init__(self):
self.mobile_view = MobileView()
self.tablet_view = TabletView()
def dispatch(self, request):
if request.type == Request.mobile_type:
self.mobile_view.show_index_page()
elif request.type == Request.tablet_type:
self.tablet_view.show_index_page()
else:
print('cant dispatch the request')
class RequestController(object):
""" front controller """
def __init__(self):
self.dispatcher = Dispatcher()
def dispatch_request(self, request):
if isinstance(request, Request):
self.dispatcher.dispatch(request)
else:
print('request must be a Request object')
class Request(object):
""" request """
mobile_type = 'mobile'
tablet_type = 'tablet'
def __init__(self, request):
self.type = None
request = request.lower()
if request == self.mobile_type:
self.type = self.mobile_type
elif request == self.tablet_type:
self.type = self.tablet_type
if __name__ == '__main__':
front_controller = RequestController()
front_controller.dispatch_request(Request('mobile'))
front_controller.dispatch_request(Request('tablet'))
front_controller.dispatch_request(Request('desktop'))
front_controller.dispatch_request('mobile')
### OUTPUT ###
# Displaying mobile index page
# Displaying tablet index page
# cant dispatch the request
# request must be a Request object
front_controller.py
