Ikenna Okpala: Scala's Lift Web Framework - 03/11/2010
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Ikenna Okpala: Scala's Lift Web Framework - 03/11/2010
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Ikenna Okpala: Scala's Lift Web Framework - 03/11/2010
- 1. Ikenna Okpala Twitter:@kengimel 3rd November 2010 Lightening Talk on Scala's Lift Web Framework
- 2. 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.
- 3. 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)
- 4. 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
- 5. <!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
- 6. 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
- 7. 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.
- 8. 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
- 9. THANKS
- 10. THANKS