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front_controller.py

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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.

"""

from __future__ import annotations

from typing import Any

class MobileView:

def show_index_page(self) -> None:

print("Displaying mobile index page")

class TabletView:

def show_index_page(self) -> None:

print("Displaying tablet index page")

class Dispatcher:

def __init__(self) -> None:

self.mobile_view = MobileView()

self.tablet_view = TabletView()

def dispatch(self, request: Request) -> None:

"""

This function is used to dispatch the request based on the type of device.

If it is a mobile, then mobile view will be called and if it is a tablet,

then tablet view will be called.

Otherwise, an error message will be printed saying that cannot dispatch the 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("Cannot dispatch the request")

class RequestController:

"""front controller"""

def __init__(self) -> None:

self.dispatcher = Dispatcher()

def dispatch_request(self, request: Any) -> None:

"""

This function takes a request object and sends it to the dispatcher.

"""

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'))

Cannot dispatch the request

>>> front_controller.dispatch_request('mobile')

request must be a Request object

"""

if __name__ == "__main__":

import doctest

doctest.testmod()