Elaboration

1
Elaboration

• Lecture Oo18
• Gymnastics System Example Contd

2
References

• The Booch Method Guide, for Rose 2.0

3
Teaching Points

• Validation
• Architectural Design

4
Review

• What are the products of architectural design?
• How would you validate you domain analysis?

5
Validation

• Are we building the right product?
• Use the requirement

6
Gymnastics System Example

• The scoring use case

7
(No Transcript)
8
Adding Raw Scores
9
When to Stop Domain Analysis

• You have identified all domain entities that play
  a role and defined their classes
• You have specified the relationships between each
  of these classes

10
When to Stop Domain Analysis

• You have associated with each class all
  operations performed on it (from uses cases)
• You have analyzed each operation to the point
  where you understand what it needs to do and what
  other classes are involved

11
Layered Architecture

• Packages are organized in a hierarchy of layers
  where each layer has a well-defined interface
• e.g. The OSI model for network services is a
  layered architecture
• Classic three-tier architecture
• Presentation (windows, reports, etc.)
• Application Logic (tasks and rules that govern
  the process)
• Storage (persistent storage mechanism)

12
Three-tier Architecture
13
Three-tier Architecture (contd)

• Identified by the separation of the application
  logic into a distinct middle layer
• Presentation layer is free of application logic
  and just forwards requests to middle tier
• Middle tier communicates with a back end storage
  layer

14
Three-tier Architecture (contd)

• Advantages
• the opportunity for reuse
• the possibility of distributing application logic
  on a network
• allocation of developers to construct specific
  tier (based on interface specs, that is good OO
  decomposition)

15
Multi-tiered Architectures

• The logical extension of three-tier architecture
• You can decompose a three-tier into multiple
  services

16
Multi-tiered Architectures
17
The Gymnastics System
18
Teaching Points

• Validation
• Architectural Design