Java Framework for Database-Centric Web Engineering

•

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Presentation given at WebE 2001, 4th Workshop on Web Engineering (in conjunction with 10th International World Wide Web Conference), Hong Kong, May 2001 ABSTRACT: We present a database-centric approach to web site development in which both application and web content data are managed by a database. The development process is based on three main stages of information modelling, document content design and presentation specification. A Java framework based on the OMS object-oriented data management system has been developed to support the development life cycle from rapid prototyping through to operation. We describe how the framework supports access from heterogeneous clients and how it has been extended to include a web content manager.

Technology Education

Java Framework for Database-
Centric Web Site Engineering

Beat Signer, Michael Grossniklaus and Moira C. Norrie
{signer, grossniklaus, norrie}@inf.ethz.ch
Institute for Information Systems
ETH Zurich

Outline

• Motivation
• OMS Database Development Suite
• XML Server Component
• Customised Applications
• Content Management Server

Motivation

• Current web interfaces to DB systems are
 Based on HTML and related technologies
 Optimised for large displays (> 640x480 pixels)
• Trend to new types of devices with different
browser capabilities
 WebPads, Handhelds (Palm, Handspring,... ), WAP-
enabled mobile phones, NTT DoCoMo's I-Mode
phones, Digital TV, ...
 Not suited for 1:1 rendering of most existing web sites

Motivation...

• Generic database interface instead of developing
a new interface from scratch for every device type
 Use a technology which allows the separation of
content from its presentation (XML)
 Rendering (XSL) based on the user agent type
requesting the data

OMS Database Development Suite

OM
Semantic Object Data Model Application Modelling

OMS Pro
Rapid Prototyping System Database & Application
and Lightweight DBMS Design

OMS Java
Data Management System Implementation
& Application Framework

DB-Centric Web Site Development

DB with
Information Model
Generic Browsers

Document Content DB with
Defaut Templates

DB with Customised
Document
Templates

XML Server Component
XML HTML WML
Browser Browser Browser

Main Entry Servlet
Delegation
XML + XSLT
 Response
XML Servlet HTML Servlet WML Servlet

Builds XML
based on JDOM
XML Server

OMS Java API

OMS Java Workspace

Example
Types
XML Response
<?xml version="1.0" encoding="UTF-8" ?>
<oms>
<instance id="1132" type="person" >
<dressedWith type="person" />
Attributes <attribute name="forename" >
<string>Beat</string>
</attribute>
…
<attribute name="picture" >
<photofile>/images/ETH/beat.jpg</photofile>
</attribute>
Methods <method name="age" />
…
<link idref="788" inv="false" name="Workplace" />
</instance>
</oms>
Links

Application Development

1. Prototype the OM model in OMS Pro
2. Export to OMS Java
• DDL (Data Definition Language), DML (Data
Modification Language)
3. Installation of XML Server with default XSL
stylesheets and servlets
4. Optional customisation of stylesheets and
servlets

Existing Solutions

Document Based Approach Data Based Approach

• Conventional content • Databases brought to the
management systems web
• Document elements are • Close relation between
stored in a DB database type and page

Content Management Server

CMWorkflows CMGatekeepers

CMTemplates CMComponents CMContents

Application
Objects

Content Management Server...
CMText

CMContainer
CMPicture
CMText
CMNavigation CMContainer

CMText

CMPage GlobisEvent

CMPicture
CMMixed
CMText

CMMixed

CMLink CMText

Conclusion

• Database-Centric Web Engineering
 Support entire development process
 Manage document content and application objects
• OMS Java Framework
 High-Level Data Management
 XML Server
 Content Management

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