What is a framework? Web service? Why do you want them

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Idaho National Engineering and Environmental Laboratory
What is a Framework?
Web Service? Why do
you need them?
Wayne Simpson ([email protected])
November 5, 2003
Idaho National Engineering and Environmental Laboratory
Purpose
• Show a solution to implement reusable components
under a controlled environment
• Explain what is a “Framework” for components in
Object Oriented (OO) Programming
• Explain the need for a Framework
• Explain the need for a Web Service
Idaho National Engineering and Environmental Laboratory
Agenda
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Problem: Efficiency of Software Development
History
What is a Framework?
Benefits of a Framework
Implementing Framework: Web Services
Cost Savings of a Framework/Web Service
Demonstration
Idaho National Engineering and Environmental Laboratory
Problem: Efficiency of Software
Development
• Methods of sharing code
– Coworkers’ code
– Previous applications
– Internet search
• Modifications cannot be implemented easily
• Workload remained the same with fewer resources
• Needed consistency in programming/naming
conventions
Idaho National Engineering and Environmental Laboratory
History
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Received object-oriented training
Received UML training
Studied existing framework
Researched concept of web services
Set proposed standards
Developed four pilot projects
Evaluated lessons learned
Reset standards
Built a number of components for framework
Using framework for all new development activities
Completing evaluation of web services interface
Idaho National Engineering and Environmental Laboratory
What is a Framework?
• Framework is a group of components that work
interactively with requests from other components or
objects to generate a consistent output.
Framework
(Black Box)
Company
business
rules,
standards,
policies
Java
C#
C++
VB.Net
Presentation,
business rules,
database queries, etc
Object
(GUI, XML, data, authentication, etc)
Controlled Environment
Idaho National Engineering and Environmental Laboratory
Example
Framework
(Black Box)
Company
business
rules, standards,
policies
Java
C#
C++
VB.Net
Drop Down List,
Select * from
Users, log file
Render: Drop Down List of Users on a Web page
or Window Application, recording any errors to the log file
75% complexity
Procedural Application
100% complexity
25% complexity
Idaho National Engineering and Environmental Laboratory
Benefits of a Framework
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Consistency across many platforms
Better able to enforce standards and policy
Better way to reuse components
Lower skilled employee can perform work more
efficiently
• Single point of change to a common interface
• Produce applications that are more robust, faster,
stable and consistent
Idaho National Engineering and Environmental Laboratory
Implementing Framework: Web
Services
• A web service is a component that is presented as a URL that returns
the desired information or objects
• Web services are built the same way as class objects
• Using a web service
– Add a web reference
– Add applicable XML documents
– Call the web service through a URL, passing the necessary
parameters
– Process the information or object returned
Idaho National Engineering and Environmental Laboratory
Framework and Web Service Environment
Presentation
Business Objects
Framework/
Web Service
Database
XML
Production/
Development
Development
Idaho National Engineering and Environmental Laboratory
Cost Savings of a Framework/Web
Service
• Current Object Orient programming cost savings over
procedural programming is 20% to 30% at the
INEEL.
• Other companies are achieving 40% to 60%
• Framework can make up the difference and add
another 30% cost savings
Idaho National Engineering and Environmental Laboratory
Demonstration
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