essentials of visual modeling with uml module 5...

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IBM Software Group

®

Essentials of Visual Modeling with UML

Module 5: Interaction Diagrams

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Objectives

Describe dynamic behavior and show how to capture it in a model.Demonstrate how to read and interpret:

A collaboration diagramA sequence diagram

Explain the similarities and differences between collaboration and sequence diagrams.

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Objects Need to Collaborate

Objects are useless unless they can collaborate to solve a problem.

Each object is responsible for its own behavior and status.No one object can carry out every responsibility on its own.

How do objects interact with each other?They interact through messages.

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Objects Interact with Messages

A message shows how one object asks another object to perform an operation.

: Car buyer

Message

:RegistrationController :CourseCatalogSystem

getCourseOfferings(forSemester)

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What Is an Interaction Diagram?

An interaction diagram shows an interaction that consists of a set of objects and their relationships, including the messages that may be dispatched among them.It models the dynamic aspects of a system.

Collaboration DiagramsSequence Diagrams

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Sequence diagramsCollaboration diagramsInteraction diagram comparison

Where Are We?

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What Is a Sequence Diagram?

A sequence diagram is an interaction diagram that emphasizes the time ordering of messages.The diagram shows:

The objects participating in the interaction.The sequence of messages exchanged.

Sequence Diagrams

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Example: Sequence Diagram

: Student :RegisterForCoursesForm :RegistrationController : Course Catalog:CourseCatalogSystem

1: create schedule( )

5: display course offerings( )

2: get course offerings( )3: get course offerings(forSemester)

6: display blank schedule( )

4: get course offerings( )

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Sequence Diagram Contents: Objects

:RegisterForCoursesForm :RegistrationController SWTSU Catalog : CourseCatalogSystem

Anonymous Objects

Lifelines

Named Object

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: Student : Course Catalog

Sequence Diagram Contents: Actor

Actor instances

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Sequence Diagram Contents: Messages

MessageReflexiveMessages


2: get course offerings( )3: get course offerings(for Semester)






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3: get course offerings(for Semester)





Sequence Diagram Contents: Focus of Control

Focus of Control


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Where Are We?

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What Is a Collaboration Diagram?

A collaboration diagram emphasizes the organization of the objects that participate in an interaction.The collaboration diagram shows:

The objects participating in the interaction.Links between the objects.Messages passed between the objects.

Collaboration Diagrams

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Example: Collaboration Diagram

: Student

: RegisterForCoursesForm

: RegistrationController : CourseCatalogSystem

5: display course offerings( )6: display blank schedule( )

: Course Catalog1: create schedule( )


3: get course offerings(forSemester)


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Collaboration Diagrams Contents: Objects

Objects


: RegistrationController SWTSU Catalog : CourseCatalogSystem

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Collaboration Diagram Contents: Actors



: RegistrationController SWTSU Catalog : CourseCatalogSystem

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Collaboration Diagram Contents: Links and Messages

: Student


: RegistrationController : CourseCatalogSystem

5: display course offerings( )6: display blank schedule( )

: Course Catalog1: create schedule( )


3: get course offerings(forSemester)


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Where Are We?

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Sequence and Collaboration Diagram Similarities

Semantically equivalentCan convert one diagram to the other without losing any information

Model the dynamic aspects of a systemModel a use-case scenario

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Sequence and Collaboration Diagram Differences

Collaboration diagrams

Show relationships in addition to interactionsBetter for visualizing patterns of collaborationBetter for visualizing all of the effects on a given objectEasier to use for brainstorming sessions

Sequence diagrams

Show the explicit sequence of messagesShow focus of controlBetter for visualizing overall flowBetter for real-time specifications and for complex scenarios

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What is the purpose of an interaction diagram?What is a sequence diagram? A collaboration diagram?What are the similarities between sequence and collaboration diagrams?What are the differences between sequence and collaboration diagrams?

Review

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Exercise

Given:A set of objects and their links and messages

Produce:A sequence diagramA collaboration diagram

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