The
FIGURE 2-73
Hierarchical view of the system structures.
bdd [package] SysML book [system hierarchy]
?«system?»
System
?«subsystem?»
Subsystem
?«block?»
Block
*
*
*
119 2.7 Realizing Use Cases
FIGURE 2-74
Using a part decomposition to trace messages.
:Customer
sd [block] On-board computer context [section: system/actors start car usage]
?«system?»
:On-board computer
ref BC start car usage
:Reservation
system
:Central locking
system
Apply card
SigLED(yellow, blinking = true)
Usage right
SigLED(green, blinking = false)
Usage right request
Unlock car
FIGURE 2-75
Interaction between the on-board computer structures.
sd Start car usage [up to and incl. unlock car]
:Customer
card
Apply
card
:Card
reader
:On-board
computer control
:Communication
unit :CarControl
readCustomerData()
SigCardData(data)
SigLED(yellow, blinking = true)
SigLED(green, blinking = false)
SigLED(yellow, blinking = true) srvSendMessage
(usage right request)
srvReceiveMessage
(usage right)
Unlock car
Usage right
Unlock car
Usage right request
120 CHAPTER 2 The Pragmatic SYSMOD Approach
pertaining ports transport only one object (energy) in one direction.
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