2.4 KiB
| filters_pre | kind | menupriority | title | multiTitle | |||||
|---|---|---|---|---|---|---|---|---|---|
|
article | 3 | MVC explained (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='<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr">
<head>
</head>
'
@@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.