O'Reilly ETech Conference: Laszlo RIA

O’Reilly Emerging Technology Conference Oliver Steele Chief Software Architect Laszlo Systems, Inc. April 23, 2003

Announcement
BOF: Are There Riches in Rich Internet Applications?
“This BOF will provide a forum to discuss the economics of software and services focused on the user experience: how the industry obsession with servers will interact with the emerging emphasis on application front ends.”
Winchester (this room) 6-7pm
Pizza

LZX Goal: RIA Development
LZX = XML + JavaScript
DHTML with different tags
Tags to declare views, layouts, data, animation
Leverages existing skills and capabilities
Developer sees DHTML
Deployer sees J2EE servlet
Browser sees SWF file
User sees a RIA
HTML is designed for static page publication
page = content + structure + format
HTML = text + markup + style
LZX is designed for rich internet applications
RIA = data + logic + presentation
LZX = XML + JavaScript + components

Thin Internet Application

Dynamic Internet Application

Rich Internet Application

Ingredients of a RIA

Ingredients of a RIA Platform

Features
Model
Data (XML)
Data Requests (HTTP)
Data Binding (XPath; DOM)
View
View Components (XML tags)
View Hierarchies (XML structure)
Animation (SMIL-like)
Constraints (JavaScript expressions)
Control
Scripting (JavaScript)
Events (CSS Event names)
Modularity and Extensibility
Classes (XML tags)
Includes (XInclude)
Component Libraries (tags + includes)

LZX Feature Walkthrough

Desktop Application Model (MVC)

Supporting RIA Development
Best Development Practices
Modularity
Extensibility
Separation of concerns (MVC)
Team Development Practices
Text-based
Collaboration
Media import
Productivity
Declarative
Standards-based
Low boilerplate

Architecture of a RIA
Model
Data
View
Media
Animation
Components
Control
User interaction
Business logic
Server transactions

LZX Ingredients
XML
View hierarchy
Data
JavaScript
Program logic and behavior
“ Back door”
Other Technologies
XPath for binding views to data
HTTP for data and media queries

Looking Back: HTML
Simple applications are simple
Complex applications are feasible
Supports collaboration between developers and designers
The domain is the
Presentation of static documents.

Looking Forward: RIA Development
Simple applications should be simple
Complex applications should be feasible
Support collaboration between developers and designers
The domain is the presentation of rich interactive transactional web-deployed applications.

O'Reilly ETech Conference: Laszlo RIA

by Oliver Steele

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