Software Architecture in Practice

1
Software Architecture in Practice

• RiSEs Seminars
• Basss book Chapter 15
• Ana Paula Cavalcanti

2
Summary

• CelsiusTech A Case Study in Product Line
  Development (Chapter 15)
• Relationship to the Architecture Business Cycle
• Requirements and Quality
• Architectural Solution
• Conclusion

3
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTech Leading supplier of
command-and-control systems Composed of
CelsiusTech Systems, CelsiusTech Eletronics,
CelsiusTech IT

• The ship System 2000 Naval Product Line
• Integrated system that unifies all weapons,
  command-and-control and communications systems on
  warship
• Production of a wide variety of naval systems
  (surface and submarine)
• Economics of Product Lines

4
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
ships ships

A
B
C
D
E
F
G
                       
1986 1988 1990 1992 1994 1996

• Shrinking schedules

5
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15

• Code Re-use
• Using Core assets to expand the Business Area
• Takes advantage of the architecture and other
  core assets

A successful product line organization considers
its business to be the care, nurturing, and
growth of its software product line, singular,
particularly its core asset base.
An important point is what a successful product
line organization can do, at the enterprise
level, with this powerful capability. That is, an
articulated definition of what systems are within
the product lines capability to build.
6
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15

• Motivation
• Everything was new (time of high technology flux)
• Analysis of the business context
• Ownerships changes
• Necessity to change organization by
  circumstances award of 2 naval contracts
• Technology changes maturation
• Increased the time required to create product
  line but up to 1/3 of its initial technology
  investment was spent building assets that can now
  be purchased commercially.

7
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTechs Organizational Structure 1980-1985
Functional Areas
Each functional area was led by a project manager
8
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTechs Organizational Structure 1987-1991
Product Line Software Development Teams
9
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTechs Organizational Structure 1987-1991

• Strong management team focused on product line
• The success of a product line hinged on a stable
  yet flexible architecture
• Architecture team was responsible for the initial
  development and continued ownership and control
  of the product line architecture
• Project staffing levels ranged from an initial 20
  to 30 to a peak of more than 200.

10
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTechs Organizational Structure 1992-1998
11
Relationship to the Architecture Business Cycle
CelsiusTech A Case Study in Product Line
Development Chapter 15
CelsiusTechs Organizational Structure 1992-1998

• Emphasis increasingly shifted from the
  development of the architecture and product line
  elements to the composition of new customer
  systems from the product line.
• Increased the size and responsibilities of the
  customer project management group.
• Staffing ? fewer designers, developers and
  integrators.

12
Requirements and Quality
CelsiusTech A Case Study in Product Line
Development Chapter 15
For new products to be derived from an
organizational repository, they must be
structured so that they can share modules. There
must be a standard set of modules.

• Primary purpose of an architecture
• Achieve a system that meets its behavioral and
  quality requirements
• Performance
• Modifiability
• Safety, reliability and availability
• Testability

13
Architectural Solution
CelsiusTech A Case Study in Product Line
Development Chapter 15

• Process View
• How distribution was accomplished
• Layered View
• Discussing how Ship System 2000 achieves a
  separation of concerns
• Module Decomposition View
• Show assignment of responsibilities to different
  large-scale elements of the system

14
Conclusion
CelsiusTech A Case Study in Product Line
Development Chapter 15

• CelsiusTech evolved from a defense contractor
  providing custom-engineered point solutions to
  essentially a vendor of commercial off-the-shelf
  naval systems
• Architecture served as the foundation of the
  approach technically and culturally and for a
  long-term development effort.
• Full support of project management
• Architectures teams authority

15
References

• BASS, L. CLEMENTS, P. KAZMAN, R. Software
  Architecture in Practice. Addison-Wesley, 2003.
• CLEMENTS, P. NOTHROP, L. Software Product Lines
  Practice and Patterns. Addison-Wesley, 2002.