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Unit 8: Advanced Interaction Modelling
8.2.2 Sequence Diagrams with Transient Objects Notes
ObjectA is an active object that initiates an operation. The notation for a call is an arrow from the
calling activation created by the call. Activation, therefore, has a call arrow coming into its top
and a return arrow leaving its bottom. If an object does not exist at the beginning of a sequence
diagram, then it must be created during the sequence diagram.
!
Caution The UML shows creation by placing the object symbol at the head of the arrow for
the call that creates the object.
Conditionals on a sequence diagram also can be shown.
Figure 8.6: Sequence Diagram with a Transient Object
Source:http://elearning.vtu.ac.in/13/ENotes/OOAD/Object%20Oriented%20Modeling%20and%20
Design%20Patterns-%20Lecture%20%20%20Notes-Dr.pdf
8.2.3 Guidelines for Procedural Sequence Models
Active vs. passive objects.
By definition, active objects are always activated and have their own focus of control.
Advanced features.
Only show implementation details for difficult or especially important sequence diagrams.
Task Compare and contrast passive objects and active objects.
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