Component Based Software Engineering

1
Component Based Software Engineering

• Presented by
• Homer LeMar
• March 30th, 2005

2
Outline

• Component Based Software Engineering (CBSE)
  Overview
• Advantages/Disadvantages of CBSE
• CBSE vs. Traditional Software Engineering (SE)

3
What is a Component?

• A software component is a software element that
  conforms to a component model, and can be
  independently deployed and composed without
  modification according to a composition
  standard.
• 1,2

4
What is a Component?-cont..

• Component Model
• Interaction Standards
• Clearly Defined Interface
• Composition Standards
• Describe how components can be composed into
  larger structures
• Substitutions
• Example COM

5
CBSE Definition

• Developing new software from pre-built
  components.
• Attempt to make an association between SE and
  other engineering disciplines.

6
Advantages of CBSE

• Management of Complexity
• Reduce Development Time
• Increased Productivity
• Improved Quality
• 3

7
Disadvantages of CBSE

• Development of Components
• Lack of Components
• Component Maintenance Costs
• Reliability and Sensitivity to changes
• Unsatisfied Requirements
• Trust
• 3

8
More on Trust

• Components come in several forms
• Binary
• Source Code
• Need a Certification Standard
• Tests
• Environments

9
CBSE vs. Traditional SE

• CBSE views the system as a set of off-the-shelf
  components integrated within an appropriate
  architecture.
• SE seeks to create a system from scratch.

10
CBSE vs. Traditional SE-cont..

• CBSE Life Cycle is
• shorter.
• CBSE develops
• Architecture.
• CBSE is less
• expensive
• 3

11
CBSE vs. Traditional SE-cont..
12
CBSE vs. Traditional SE-cont..

• CBSE does not have any standard development
  models like UML for SE.
• CBSE is young, therefore long term
  maintainability is largely unknown.
• 4

13
CBSE vs. Traditional SE-cont..

• SE can fulfill requirements more easily.
• CBSE fulfillment of requirements is based on the
  available components.

14
Consequences of CBSE

• Promote Large Scale Reuse
• Reduce Cost

15
Summary

• Young discipline
• CBSE involves developing a system from pre-built
  software components
• It has Advantages and Disadvantages.

16
References

• 1 Council, William T. and Heineman, George T.,
  Component-Based Software Engineering.
  Addison-Wesley Upper Saddle River, 2001.
• 2 Pour, Gilda, Component-Based Software
  Development approach New Oppurtunities and
  Challenges, Proceedings of the 26th
  International Conference on Technology of
  Object-Oriented Languages and Systems, 1998.
• 3 Crnkovic, Ivica, Component-based Software
  Engineering New Challenges in Software
  Development, in 27th Int. Conf. Information
  Technology Interfaces ItI 2003, June 1-19, 2003,
  Cavtat, Croatia.
• 4 Way, Ju An, Towards Component-Based Software
  Engineering, Proceedings of the eighth annual
  consortium on Computing in Small Colleges Rocky
  Mountain conference, pg. 177-189, Orem, Utah,
  2000.