Basics of RSA Rational Software Architect

What is RSA? Comprehensive Modeling and Development environment that leverages the Unified Modeling Language (UML) for designing architecture for C++ and Java 2 Enterprise Edition (J2EE) applications and web services Is built on the Eclipse open-source software framework

Model A model is a complete description of the system from a particular perspective.

What do we learn today? Use case modeling Activity Diagrams Sequence Diagrams

Workbench The term workbench refers to the desktop development environment used in RSA

Creation of a new project

Select UML project

Project name of your choice

Change the file name accordingly

Default diagram can be a use case diagram, activity diagram or just a freeform diagram

Workbench looks like this after you create your first project

Use case diagrams

Use Case Model Basics User centric Actor- represents anything external to the system that will interact with the system Actor represents a role that a user plays Each actor uses the system in different ways Each way the actor uses the system is a use case

Contd… Use Case is initiated by an actor and describes transactions offered by the system Use case represents what the system must provide rather than how Scenario is a session that an actor has with the system Use cases represent a set of potential scenarios

Relationships Include and extendGeneralization

Activity Diagrams

Activity Diagram Basics

Sequence Diagrams

Sequence Diagrams Basics Lifelines represent either roles or object instances that participate in the sequence being modeled The message that is being sent to the receiving object represents an operation/method that the receiving object's class implements

A synchronous message is used when the sender waits until the receiver has finished processing the message, only then does the caller continue A closed and filled arrowhead signifies that the message is sent synchronously With an asynchronous message, the sender does not wait for the receiver to finish processing the message An open arrowhead is used to indicate that a message is sent asynchronously

Alternatives are used to designate a mutually exclusive choice between two or more message sequences

The option combination fragment is used to model a sequence that, given a certain condition, will occur; otherwise, the sequence does not occur. An option is used to model a simple "if then" statement

Examples of Use Case Diagrams

Examples of Sequence Diagrams

Examples of Activity Diagrams