July 2004
Intermediate to advanced
752 pages
35h 59m
English
book
Unified Modeling Language Reference Manual, The, Second Edition
by James Rumbaugh, Ivar Jacobson, Grady Booch
Content preview from Unified Modeling Language Reference Manual, The, Second Edition
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duration observation action
An action that returns the value of a duration at run time.
Notation
The duration of a message transmission may be shown on a message as:
name = duration
Figure 14-124 shows an example.
Discussion
Although this is stated as an action in the UML specification, in most cases modelers would want to make assertions about time without executing run-time actions. It is probably best to regard this as simply a definition of a name that can be used in a constraint expression, rather than a real action.
The basic model of interactions make the assumption that time on different lifelines is independent (an “Einsteinian” assumption). Measuring the duration of a message transmission requires that the time scales of the two lifelines ...
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