Tool Mentor: Managing Sequence Diagrams Using Rational Rose










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Tool Mentor: Managing Sequence Diagrams Using Rational Rose















This tool mentor describes how to use Rational Rose to create sequence diagrams that show interactions between objects.


Tool: Rational Rose






Relationships



Related Elements


Use-Case Analysis


Use-Case Design






Main Description



Overview The following is a summary of the steps you perform to use sequence diagrams to describe the interactions between objects: Create a sequence diagram under the Use-Case Realization Place the participating objects and actors in the sequence diagram Describe the messages between the objects Describe what an object does when it receives a message For more details about sequence diagrams, see: Sequence Diagrams (Overview) topic in the Rational Rose online help. Chapter 4, Introduction to Diagrams and Chapter 9, Interaction Diagrams and Specifications in the Using Rational Rose manual. 1. Create a sequence diagram under the Use-Case Realization When you create a sequence diagram for a use case realization, consider naming the diagram "<use-case name> - <flow type>". This naming convention simplifies future tracing of objects to the use-case realization that they participate in. Also, use the documentation window to enter a brief description of the scenario that the sequence diagram depicts. 2. Place the participating objects and actors in the sequence  diagram One of the primary elements of a sequence diagram is an object. An object has state, behavior, and identity. The structure and behavior of similar objects are defined in their common class. Each object in a diagram indicates some instance of a class. An object that is not named is referred to as a class instance. In this step, you: Drag and drop actors onto the sequence diagram. Add objects to the diagram and identify the classes to which the objects belong. 3. Describe the messages between the objects A message represents the communication between actors and objects, indicating that an action will follow. It carries information from the source focus of control to the destination focus of control. In a sequence diagram a message icon represents exactly one message. When you create a message, use the documentation field in the Message Specification to describe the message. 4. Describe what an object does when it receives a message To enhance a message, you can attach a script to it. Use the Text Box symbol in the sequence diagram toolbar.





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