An Introduction to UML Modeling Resources Using UML

An Introduction to UML & Modeling Resources Using UML Rahul Shah EE 249 Discussion Sept. 25, 2001

Talk Outline w An introduction to UML n n Different views in UML Examples from Pico. Radio UML documentation w Discussion of Bran Selic’s paper, “A generic framework for modeling resources with UML”

The Development Process Project Phases Process Components Requirements capture Analysis & Design Implementation Test Inception Elaboration Construction Transition }UML

Unified Modeling Language w Object oriented modeling language w Intended to model discrete systems such as software, firmware or digital logic “Models are used to capture and precisely state requirements and domain knowledge so that all stakeholders may understand agree on them. ” (Rumbaugh, Jacobson & Booch)

UML Views w Structural: things in the system and their relationship to other things n n n Class diagrams Use case diagrams Component diagrams w Dynamic: system behavior over time n n n Statechart diagram Activity diagram Sequence diagram w Model management, others

Class Diagram† †Pico. Radio UML documentation

Use Case Diagram† †Pico. Radio UML documentation

Activity Diagram† †Pico. Radio UML documentation

Sequence Diagram† †Pico. Radio UML documentation

A Generic Framework for Modeling Resources With UML Bran Selic IEEE Computer, June 2000.

Quantitative Analysis w Schedulability analysis n n Deterministic technique Good for hard real-time systems w Performance analysis n n Probabilistic characterization Good for soft real-time systems

Qo. S Contracts Peer interpretation Layered interpretation (realization mappings play the role of Qo. S contracts)

UML Model of Qo. S Contracts Composition Associations Association Class Aggregation

Management of Resources Generalization

Realization Mapping Realization relationship

Qo. S Analysis w Compare the required Qo. S with the offered Qo. S w The offered Qo. S should exceed the required Qo. S w Aggregated Qo. S characteristics can complicate the analysis: n n Different characteristics combine in different ways Resources are often shared

Conclusions w Models are useful to predict and quantify performance of software without actual construction w Incorporating a generic Qo. S framework in UML helps us in analyzing software models w UML is an industry standard, thus a common base to develop new techniques for analysis