lightingjnr.blogg.se - Draw symmetrical sequence diagram online

Draw a lifeline representing the system as a black box.

Events generated by cashier (actor)- makeNewSale enterItem endSale makePayment.

Following example shows the success scenario of the Process Sale use case.

Messages, modeled as horizontal arrows between Activations, indicate the communications between objects.

The notation for a Lifeline is a vertical dotted line extending from an object.

LifeLine identifies the existence of the object over time.

Actor:An Actor is modeled using the ubiquitous symbol, the stick figure.

Because the system is instantiated, it is shown as an object.

Represented as a rectangle which contains the name of the object underlined.

Also for frequent and alternative scenarios.

Should be done for the main success scenario of the use-case.Depict the temporal order of the events.Match operations of the system in response to the events generated.The system events that the actors generate.The external actors that interact directly with the system.SSD Components For a particular scenario of use-case an SSD shows. Typical course of events that external actors generate and.Interior objects are not shown, as they would be on a Sequence Diagram.SSD is associated with use-case realization in the logical view of system development.SSD is an artifact of analysis that illustrates input and output events related to the system.Can be used test user interface requirements.Used in design to assign object responsibilities.Shows the messages exchanged between objects in time order sequence.Shows objects and classes involved in a use case scenario.Drawing System Sequence Diagrams Chapter 10 Applying UML and Patterns Craig Larman