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BehavioralModeling
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Key IdeasBehavioral models describe the internal dynamic aspects
of aninformation system that supports business processes in an
organization
Key UML behavioral models are: sequence diagrams,
collaborationdiagrams, and statechart diagrams
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Behavioral Models -
Introduction2 types of behavioral models:
1. Used to represent the underlying details of a
business process portrayed by a use case model
Interaction diagrams: - Sequence and Communication diagram.
2. Used to represent the changes that occur in the underlying
data
State machines diagram
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Purpose of Behavioral
ModelsTo depict the internal view of business processes that a
use casedescribes or dynamic view of an IS
To show the effects of varied processes on the system
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Interaction DiagramsIt focus on object levelInteraction Diagrams
Components
Objects
Operations
objects behavior Messages
It model the interaction that take place between the objects in
an IS
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Sequence DiagramsIllustrate the objects that participate in a
use-caseShow the messages that pass between objects for aparticular
use-case
It is a dynamic model that shows the explicit sequence of
messages that are passed between objects in a
definedinteraction.
It emphasize the time-based ordering of the activity that
takes place among a set of objects.
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Example of Sequence Diagram
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Sequence Diagram Syntax
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AN ACTOR
AN OBJECT
A LIFELINE
An execution Occurrence
A MESSAGE
OBJECT DESTRUCTION
anObject:aClass
aMessage()
x
Return Value()
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Building a SequenceDiagram
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Determine the context of the sequence diagrama system, a use
case,
a scenario of a use case, or an operation o a class.
Identify the participating objects
Set the lifeline for each object
Add messages
Place the execution occurrence on each objects lifeline
Validate the sequence diagram
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Normal Flow of Events:
1. Customersubmits a search request to the system.2. The system
provides thecustomer a list of recommended CDs.3. The customer
chooses one of the CDs to find additional
information.4. The system provides the customerwith basic
information &
CD Reviews
5. The customer calls the maintain order use case.6. The
customer iterates over 3 through 5 until finished shopping.7. The
customerexecutes the checkout use case.8. The customerleaves the
website.
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Statechart Diagrams
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The statechart diagram shows the different states of the object
and whatevents cause the object to change from one state to
another.
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Components of Statechart
Diagrams
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States
Events
Transitions
Actions
Activities
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Example Statechart Diagram
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Statechart Diagram Syntax
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A STATE
AN INITIAL STATE
A FINAL STATE
AN EVENT
A TRANSITION
aState
anEvent
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Building Statechart
Diagrams
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Set the context
Identify the initial final, and stable states of the object
Determine the order in which the object will pass throughstable
states
Identify the events, actions, and guard conditions
associated
with the transitionsValidate the statechart diagram
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SummarySequence diagramsillustrate the classes that participate
in a use case and themessages that pass between them.
Statechart diagramsshow the different states that a single class
passes throughin response to events.
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