Object modelling technique

1
Object modelling technique

• OMT

2
OMT

• An OMT example
• A company manufactures two computer based
  products
• 1 A firewall
• 2 A factory data logger
• Consider the components of 1,2

3
Firewall

• Network interface 1 NIC1 set and get transmit
  rate, on motherboard
• NIC2 intranet or internal LAN set and get
  transmit rate, PCI add on card
• Monitor program set and get clock rate
• Firewall used with Office LAN

4
Data logger

• Network interface 1 NIC1 set and get transmit
  rate on motherboard
• Monitor program set and get clock rate
• Data converter analogue to digital reset function
  and get value, PCI add on card
• A to D, 1 or 2 cards
• Data logger used in factory

5
Object oriented analysis OOA

• Inheritance
• Identify common features
• Aggregation
• Part of
• Association
• Used with

6
Inheritance common features

• Network interface 1 NIC1 set and get transmit
  rate, on motherboard
• Functions set and get rate
• Attribute rate bits per sec
• Monitor program set and get clock rate
• Functions set and get clock frequency
• Attribute clock frequency cycles per sec

7
Firewall object oriented analysis OOA

• Part of
• NIC2 intranet or internal LAN set and get
  transmit rate, PCI add on card
• Association
• Firewall used with Office LAN

8
Data logger OOA

• Part of
• Data converter analogue to digital reset function
  and get value, PCI add on card
• Association
• Data logger used in factory

9
Object schema

• An object schema can be draw from the the results
  of the analysis
• Notation
• Triangle inheritance
• Diamond part of
• Line - association

10
Review OMT

• OMT may be used to design the initial schema
• The initial and final schemas may differ due to
  incremental development
• Code is added via IDE
• Back annotation not normally supported

11
Review OMT

• JB can produce a detailed object schema
• The object schema is useful when creating
  documentation
• Opinion JohnT
• Object modelling provides limited support for
  flow control