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"""

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

*TL;DR

Provides a centralized entry point that controls and manages request handling.

"""

class MobileView:

def show_index_page(self):

print("Displaying mobile index page")

class TabletView:

def show_index_page(self):

print("Displaying tablet index page")

class Dispatcher:

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:

""" 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:

""" 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

def main():

"""

>>> front_controller = RequestController()

>>> front_controller.dispatch_request(Request('mobile'))

Displaying mobile index page

>>> front_controller.dispatch_request(Request('tablet'))

Displaying tablet index page

>>> front_controller.dispatch_request(Request('desktop'))

cant dispatch the request

>>> front_controller.dispatch_request('mobile')

request must be a Request object

"""

if __name__ == "__main__":

import doctest

doctest.testmod()