UML > UML Example
The UML diagram examples below
are all created in the case study of describing the QSIG Private User Mobility
Registration (PUMR) service in UML. Only a subset of the available diagram
notations in UML is used. The complete case study, as well as the
methodology for creating the UML models, is available in EG 202 872.
Use
Case diagram
The creation of a
use case model is an excellent vehicle for elicitation of functional
requirements. The activity consists of identifying use cases and actors and
describing the details of each use case.
The use case diagram above describes what services (use cases)
that are available for different categories of users (PUM user, Authorized
user).
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Sequence
diagram
When describing the
details of a use case (service), a sequence diagram is one of the possible
diagram kinds to choose from in UML. When making sequence diagrams, you focus on
describing the sequences of message interactions between communicating
entities.
The sequence diagram above describes how the actor (PUM User)
initiates the de-registration use case and how the distributed system entities
(Visitor, Home) interacts by message interchange in order to carry out the
service.
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Activity diagram
Activity diagrams is
another way to describe use case behaviour, focussing on how the behaviour can
be broken down in functions, internal to the system or system part.
The activity diagram above describes in what order different
functions should be carried out and, if they are optional, under what
circumstances the functions should be invoked.
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Class
diagram
Class diagrams
typically describe the different entities of a system as classes and the
relation between these. This may for example include
system parts and their
relation
system
data
interfaces
of communicating parts
messages
and operations of interfaces
The class diagram above describes the communicating entities of the PUMR model
(Home PINX, Visitor PINX, Directory PINX) and the interfaces with
operations/messages that these entities must realize.
The class diagram above shows the different setup messages of
the PUMR model and the data these messages carry.
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Object diagram
The object diagram
puts the classes in the class diagrams into context and shows how individual
instances of classes relate to each other.
The object diagram above describes how the communicating
entities in the PUMR system environment relate and the means for communication
that exist.
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