Behavior : Sequence Diagrams - Lifelines
11 important questions on Behavior : Sequence Diagrams - Lifelines
Besides Connectable Elements, the book also use the term..
What is the format of the participants?
Where either part of the name may be empty, but not both.
As they are not objects, we do not underline the participant names,
In a Sequence Diagram these connectable elements “head” a ....?
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What does a lifeline represent?![]()
From the perspective of the each timeline, moving from the top of the diagram to the bottom represents the order of time
What is the message sequence in this diagram?![]()
At the CirculationSystem, the mayIBorrowBooks message is received before it sends the yesYouMay message.
At the NOTIONAL level, use of parentheses is rare, but otherwise, it is a place for...
When the arguement values are used at the NOTIONAL level, the notational level indicates, what?
What kind of shape is the head of a lifeline?
Where are heads of a lifeline located?
However, lifelines can be created during an Interaction, in which case the heads are located at the point of creation.
What are the 9 different lifeline occurences?
2. A Synchronous call ( Sen )
3. Synchronous call ( Received )
4. A Synchronous call ( Received)
5. Synchronous message ( Return )
6. Participant Creation
7. Object Destroyed
8. Self Message
9. Execution Specification
What will you see headed as lifeline headed, but is not recommended?
You will probably find many examples in the literature of lifelines headed by Actors.
Unfortunately, Actors cannot be connectable elements and cannot be parts.
On the other hand, all the UML tools will support the use of Actors as lifelines.
This approach is usually explained as reasonable because of changing system perspective.
For example:
if you focus on one subsystem, all the other subsystems will be as an Actor to the subsystem of interest, but all the subsystems are ultimately only parts of the system-as-a-whole.
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