Perspectives on the Unified Modeling Language semantics 10

Perspectives on the Unified Modeling Language semantics 10 th SDL Forum Copenhagen, June 2001 Trygve Reenskaug, Mogul Norway, Oslo http: //www. ifi. uio. no/~trygver Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 50 PM. 1

Three Disciplines lex mp a Co Dat Co Alg m ori plex thm s of Computing Comples Processes Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 50 PM. 2

Object Management Group A World of Interacting Objects lex mp a Co Dat Co Alg m ori plex thm s "…drive the industry towards interoperable, portable software components based on standard object-oriented interfaces. " Comples Processes Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 50 PM. 3

First OMG Achievement lex mp a Co Dat Co Alg m ori plex thm s CORBA Common Object Request Broker Architecture IDL : interfaces & operations Comples Processes XML : encoding information Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 50 PM. 4

Second OMG Achievement Unified Modeling Language Co Alg m ori plex thm s lex mp a Co Dat The UML Specification defines a graphical language for visualizing, specifying, constructing, and documenting the artifacts of distributed object systems. Comples Processes Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 5

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 Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 6

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 Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 7

An Open system Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 8

Another Open system Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 9

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. Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 51 PM. 10

Use Case Model of Open System Activity. Network. Demo Use. Case 1: Generate test networks Actor Use. Case 2: Frontload Use. Case 3: Allocate resource Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 11

Model Systems & Components with Collaborations & Roles UML Classifier. Role System: collection of Components Collaboration: collection of Roles Activity. Network. Demo / Tool Actor Model Behavior: • Use Cases • Interactions • Sequence Diagrams • State Machines • Activity Graphs Perspectives on UML semantics / Planning Service © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 12

Composition / Decomposition UML Subsystem: Behavioural grouping UML Subsystem Component = Sub-System Role = Sub-Collaboration Activity. Network. Demo / Tool Actor Model Behavior: • Use Cases • Interactions • Sequence Diagrams • State Machines • Activity Graphs Perspectives on UML semantics / Planning Service © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 13

Deployment UML Component: Deployable Subsystem UML Component = Sub-System Role = Sub-Collaboration Activity. Network. Demo / Tool Actor Model Behavior: • Use Cases • Interactions • Sequence Diagrams • State Machines • Activity Graphs Perspectives on UML semantics / Planning Service © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 14

Finally: Two Perspectives on UML Models • Class Perspective: Classes, Inheritance, Packages, Deployment • Role Perspective Collaborations, Roles, Containment, Behavior Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 15

Thank You More info at http: //ifi. uio. no/~trygver Perspectives on UML semantics © Trygve Reenskaug 2001 12/12/2021 9: 18: 52 PM. 16