-----
# Built-in
filters_pre:
- "bluecloth"
# Custom
kind: article
menupriority: 3
title: MVC explained (first design cleaning)
multiTitle:
fr: first design cleaning
en: first design cleaning
-----
## first design cleaning ##
If you want your applications to
generate strict XHTML 1.0 web pages you
have to modify your application to put the content
between an *header* and a *footer*.
Naturally, You write directly the header and footer
in the source code of the application.
You also want to initialize with some tasks.
And in order to prepare the future, you separate
the server code from you todo list code.
Then you write a specifical class for the two
*features* of your application.
Your new code will look like:
class Todo
def content
Print the content of the list
...
todo = new Todo
HEADER="<... code HTML ...>"
FOOTER="<... code HTML ...>"
Class Server
def do_GET
return HEADER + (todo.content) + FOOTER
server = new Server
server.start # and for each GET request execute do_GET
Here are the details of the modified code:
#!/usr/bin/env ruby
require 'webrick'
include WEBrick
s = HTTPServer.new( :Port => 2000 )
class Todo
def initialize
@todoList=['first task','second task']
end
def content
res='Todo
'
@todoList.each{|task| res<<='- '+task+'
'}
res<<='
'
return res
end
end
class Servlet
# you write the common header and footer of all pages
# directly in the source code
@@Header='
Todo Application
'
@@Footer='
'
@@Todo=Todo.new
def do_GET(req, res)
res.body = @@Header + @@Todo.content + @@Footer
res['Content-Type'] = "text/html"
end
end
servlet=Servlet.new
s.mount("/"){ |req,res| server.do_GET(req,res) }
trap("INT"){ s.shutdown }
s.start
For now your application isn't functionnal. But it's great,
you can print your todo list. We just have to add content
at runtime now.