python-patterns/front_controller.py at master · oftensmile/python-patterns · GitHub

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#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

@author: Gordeev Andrey <gordeev.and.and@gmail.com>

The controller 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

python-patterns/front_controller.py at master · oftensmile/python-patterns · GitHub

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