Single FSM, Consistency Checking, Global Behaviour
6 important questions on Single FSM, Consistency Checking, Global Behaviour
What can UML statecharts do?
- the behavior of an active class
- a standalone behavior, that is, one not corresponding Class
- a method corresponding to a behavioral feature
State: simple, composite, submachine
Trigger = event and can trigger several transitions
- types: message events (signal, call & anyreceive -events), change events, relative time events
What are MERODE statecharts?
- State = circle with name
- Initial = dot
- Final = double circle
- transition = arrow with trigger, guard & operation
Can be used to specify
- The behavior of an active class
Transition:
- trigger * [guard condition] / operation
Triggers:
- only message events: and of it CallEvents
What is difference between default and user specified FSM?
- initial state, default state "exists", 1 final state "ended"
- create methods
- modify methods
- end methods
User:
- contains user-specified states and transitions from/to specified states. Therefore specifies more behaviour constraints.
- like: more intermediate states, multiple end states, different create methods, etc.
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What quality checks are there regarding OET & FSM
- all methods indicated in the OET should appear in your FSM
- some methods cause a transition (O/C, O/M, O,E)
- some methods keep in same state (A/M)
Absent method in FSM may have a double interpretation
- could mean method is allowed in each state
- could mean that method is never allowed to execute
DEFAULT LIFECYLE RULE
- C should create
- M should modify
- E should end
What are the parallism rules?
- all scenarios of an existence dependent object type must be accped by its master object types.
CONTRACT RULE
- whenever two objecttypes share more than one event type, there should be a shared existence dependent object type that manages the sequence constraints on these event types.
- aka, the intersection area is covered by these shared existence dependant object types.
What are the FSM regular expressions?
B+C+D = a choice between B, C and D
B* = a repetition of B (0,1 or many times B)
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
