8-SW Reuse

Software Reuse in Engineering

• Shift from original development to reuse-based development for quicker and cheaper software production.
• Types of reuse:
• System reuse
• Application reuse (entire or family of applications)
• Component reuse (sub-systems or single objects)
• Object and function reuse

Benefits of Software Reuse:

• Accelerated development
• Effective use of specialists
• Increased dependability
• Lower development costs
• Reduced process risk
• Standards compliance

Challenges of Software Reuse:

• Maintenance and use of component libraries
• Difficulty in finding and adapting reusable components
• Potential for increased maintenance costs
• NIH syndrome (Not-Invented-Here)

Design Patterns and Integration:

• Utilizes architectural patterns, frameworks, and application integration techniques.

Application System Reuse:

• Adapt systems for different customers without changing the source code.
• Use of COTS (Commercial Off-The-Shelf) systems as examples.

Application System Integration:

• Combining multiple application systems when no single system meets all needs.
• Consider functionality, data exchange, and data compatibility.

Software Product Lines:

• Applications adapted from a common architecture for specific requirements.
• Adaptation through component configuration and modification.

Component-Based Software Engineering (CBSE):

• Development relying on reusable software components.
• Emphasis on independent components specified by interfaces and middleware support.

Service-Oriented Software Engineering:

• Allows interaction through service interfaces.
• Replaces some traditional component dependency structures.

Component Management and Issues:

• Trust in component suppliers and validation of component functionality necessary.
• Special attention required for functional and non-functional requirements interactions.