javazone 2011: goal directed web applications
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Goal-directedWeb Applications
(with Scala)
Timothy PerrettJavaZone 2011
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Agenda The Problem
Users
Existing drawbacks
The Theory Modeling
The Detail Task and functions
Asynchronous web
Leveraging Lift and Akka
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About Me
Author of Lift in Action Coding Scala since 2007
(its awesome)
Background in both dynamic and statically typed languages
Manufacturing and marketing automation is my day job http://manning.com/perrett/
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> what does this…
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RepresentativeModels.
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“…For the majority of customers, each feature or procedure is a frustrating, unwanted puzzle...”
Microsoft Research
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Oh Noes!
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…butseriously...
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Oh Noes!
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Square peg.
Round hole.
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MissedOpportunities
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There must bea better way
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Better?
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TalkingTheory
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Talking Theory
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Talking Theory
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Talking Theory
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Talking Theory
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Talking Theory
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Talking Theory
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But why?
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Talking Theory
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Talking Theory
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TheDetail.
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λfunctions
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public Thing do(what: String) {
...
}
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public Thing do(what: String) {
...
}
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public <A> Thing do(what: A) {
...
}
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def do[A](what: A): Thing = ...
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A => Thing
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A => B
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(A => B) => C
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“We find that work […] does not consist of independent, separate acts, but of a series of inter-related processes.”
Christine Frederick,
The Labor-Saving Kitchen. 1919.
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Tasks
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Tasks
A => B
Tasks are functions
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Tasks
A => B => C => n
Tasks are made-up of composable operations
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“…User interface design needs to become more engineering rather than a pure creative or artistic process…”
Martijn van Welie
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AddingLift
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Tough ProblemsSimple Functions
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Binding
NodeSeq => NodeSeq
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Binding
def list =
"li" #> prods.map { p =>
"h2 *" #> p.name &
"a [href]" #> p.link
}
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Binding
<ul lift="list_products">
<li>
<h2>Product Name</h2>
<a href="#">More...</a>
</li>
</ul>
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AJAX
T => JsCmd
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AJAX
SHtml.ajaxButton(“click me”, () => Alert(now.toString))
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BeAsynchronous
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Be Asynchronous
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Be Asynchronous
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Demo
Not a chat application in sight!
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Demo
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Demo
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Summary
“Smart UI’s” are a complete fail Task-based analysis provides an abstract for
the entire task world Functions neatly represent tasks Capture UI interaction with true user intent Comet is useful for more than chat
applications! Scalable and efficient backends using Akka End-to-end event based systems
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Further Reading Task-Based User Interface Design (PhD Thesis)
Martijn van Welie
About Face 3Cooper et al
Human-Centered Design Considered HarmfulDonald Norman
Context and Consciousness: Activity Theory and H.C.I Bonie Nardi
Inductive User InterfacesMicrosoft Reasearch
Moments of SignificanceDix, Chisalita, van der Veer
The Inmates are Running the AsylumAlan Cooper
Twitter Bootstrap: http://twitter.github.com/bootstrap/
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“Significant change must be significantly better”
Cooper et al.
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Questions?
twitter.com/timperrett
github.com/timperrett
blog.getintheloop.eu
Lift in Action
manning.com/perrett/
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