1 / 12

WebObjects

WebObjects. Matt Aguirre Lally Singh. What Is It?. A Java based development platform specifically designed for database-backed web applications. What Does It Have?. Scalability: built in load balancing among a dynamically configurable set of servers

cbyers
Download Presentation

WebObjects

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WebObjects Matt Aguirre Lally Singh

  2. What Is It? A Java based development platform specifically designed for database-backed web applications.

  3. What Does It Have? • Scalability: built in load balancing among a dynamically configurable set of servers • Industry standards support: JSP/J2EE/JNDI support built in • Multiple client type support: Web Browser, Java Client Application, XML, SMIL, WAP… • Easy extensibility: add new web components for immediate reuse.

  4. Architectural Overview

  5. Architecture In Depth

  6. Web Components • Three Parts: • HTML file • Bindings file • Java code • Embeddable within themselves: follows the Composite design pattern • Embeddable within JSP pages • Communicate to each other & Enterprise Objects (EOs) through Key-Value coding

  7. Example Web Component • A simple form containing two items: a textbox and a submit button • User hits ‘Submit’ and the name is shown in System.out. • Not very useful

  8. The HTML <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META NAME="generator" CONTENT="WebObjects 5"> <TITLE>Untitled</TITLE> </HEAD> <BODY BGCOLOR=#FFFFFF> <webobject name=Form1>Sample Form <p>Name: <webobject name=TextField1></webobject></p> <p><webobject name=SubmitButton1></webobject></p> </webobject> </BODY> </HTML>

  9. The Bindings Form1: WOForm { } SubmitButton1: WOSubmitButton { action = submit; } TextField1: WOTextField { value = name; }

  10. The Java File public class Main extends WOComponent { protected String name; public Main(WOContext context) { super(context); name = new String(); } public WOComponent submit() { System.out.println("name="+name); return null; // default - means we go back to same page } }

  11. What Happens? • When the page is requested, the value for name is taken from the Component’s instance via Key-Value Coding • The page is displayed to the user • The user types in something into the textbox • The user hits submit • WO updates the value of name with what the user put in the textbox • WO then calls Main’s submit() method • submit() prints out the string the user typed in

  12. Key Value Coding • A method to access data in classes without relying on their interfaces • Implemented through the KeyValueCoding Java interface • The default implementation scans through reflection. • Ex: to set the key foo, the following will be checked in order:

More Related