Ikenna Okpala: Scala's Lift Web Framework - 03/11/2010

Ikenna Okpala
Twitter:@kengimel
3rd
November 2010
Lightening Talk on Scala's Lift Web Framework

Lift Web: Introduction
 Lift is a web application framework written in
Scala and Created by David Pollak (@dpp on
twitter).
 To me it is expressive and elegant also caters
for maintainability, scalability and performance.
 Design goals are security, conciseness and
performance.
 It is an abtraction of the HTTP request cycle.
 Continually bringing the best of other web
frameworks and conceptsunder on umbrella.

Lift Web: ”View First” Approach
 Lift's approach is coined the “View First” design
”You can think of Lift as having a modified
Model View Presenter (MVP) that for the
purpose of this discussion we shall refer to as
ViewViewModelModel (VVMM)” (Perrett,
2011, Lift in Action)

Lift Web : ”View First” Approach
Allows Invalid States.
VIEW TEMPLATES
<<STATEFUL>>
VIEW/MODEL
SNIPPET
MODEL
Change
Notification Error
Notices
Execute Commands Apply / Commit
ADAPTED FROM LIFT IN ACTION MEAP EDITION
FOUND AT: http://bit.ly/c5B919

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>ljcexample</head>
<body>
<h1>Hello World</h1>
The Time is:
<lift:HelloWorldSnippet>
date is rendered here
</lift:HelloWorldSnippet>
</body>
</html>
Lift Web: Hello World
VIEW

package ljcexample.snippet
import _root_.scala.xml.NodeSeq
import _root_.java.util.{Date}
case class myModel(mydate: Date)
class HelloWorldSnippet {
val today = myModel(new Date)
def render(in: NodeSeq): NodeSeq =
<span> {today.mydate.toString} </span>
}
Lift Web: Hello World
VIEW/MODEL

Why Lift ?
 More powerful HTTP request / response control
 Functional conciseness
 Pattern macthing
 Hign order functions
 case classes (for modelling and data tranfer or VO)
 Better OO modeling with Scala (using traits
etc..)
 Easier and friendly use of XML.
 Leveraging Scala Actors library
 Great community, fast responses.

Lift Web: Getting Started
 Lift's Home @ www.liftweb.net and
demo.liftweb.net
 SBT and Lifty.. www.lifty.org
 Getting started chat example from
www.liftweb.net
 Scala Lift Off Videos On Skills Matter Website
at this address: http://bit.ly/bhIAaw
 Join the London Scala User Group and Lift's
mailing list
 Lift in Action by Tim Perrett due Feb. 2011,
MEAP version found here: http://bit.ly/c5B919

Ikenna Okpala: Scala's Lift Web Framework - 03/11/2010

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