Perspectives on the Unified Modeling Language semantics

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Perspectives on theUnified Modeling Language
semantics
10th SDL Forum Copenhagen, June 2001
Trygve Reenskaug, Mogul Norway, Oslo
http//www.ifi.uio.no/trygver
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Three Disciplinesof Computing
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Object Management GroupA World of Interacting
Objects
"drive the industry towards interoperable,
portable software components based on standard
object-oriented interfaces."
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First OMG AchievementCORBA
Common Object Request Broker Architecture
IDL interfaces operations XML encoding
information
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Second OMG AchievementUnified Modeling Language
The UML Specification defines a graphical
language for visualizing, specifying,
constructing, and documenting the artifacts of
distributed object systems.
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A system is a chosen view on reality
A system is a part of the real world which we
choose to regard as a whole, separated from the
rest of the world during some period of
consideration. A whole that we choose to
consider as a collection of components, each
component being characterized by attributes and
by actions which may involve itself and other
components.
Holbæk_Hanssen et.al. System Description and the
Delta Language Oslo, 1977
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Open Systems
For a given system, the environment is the set
of all components outside the system that affect
the system or that are affected by the system.
Etzioni Modern Organizations Prentice-Hall, 1964
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An Open system
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Another Open system
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Perspectives on System Components
Classification Group on common characteristics

• Artifact Group on common purpose.
• People categorize objects in terms of they roles
  the play within intuitive theories about how the
  world operates.
• Artifacts can't be defined by their shape or
  their constitution, only by what they can do and
  by what someone, somewhere, wants them to do.

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Use Case Modelof Open System
ActivityNetworkDemo
UseCase 1 Generate test networks
Actor
UseCase 2 Frontload
UseCase 3 Allocate resource
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Model Systems Components withCollaborations
Roles
System collection of ComponentsCollaboration
collection of Roles
ActivityNetworkDemo
/ Tool
Actor

• Model Behavior
• Use Cases
• Interactions
• Sequence Diagrams
• State Machines
• Activity Graphs

/ Planning Service
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Composition / DecompositionUML Subsystem
Behavioural grouping
Component Sub-SystemRole Sub-Collaboration
UML Subsystem
ActivityNetworkDemo
/ Tool
Actor

• Model Behavior
• Use Cases
• Interactions
• Sequence Diagrams
• State Machines
• Activity Graphs

/ Planning Service
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DeploymentUML Component Deployable Subsystem
Component Sub-SystemRole Sub-Collaboration
UML Component
ActivityNetworkDemo
/ Tool
Actor

• Model Behavior
• Use Cases
• Interactions
• Sequence Diagrams
• State Machines
• Activity Graphs

/ Planning Service
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FinallyTwo Perspectives on UML Models

• Class Perspective Classes, Inheritance, Package
  s, Deployment
• Role Perspective Collaborations,
  Roles, Containment, Behavior

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Thank You
More info at
http//ifi.uio.no/trygver