![]() ![]() Solid arrows with full heads are synchronous calls, solid arrows with stick heads are asynchronous calls anddashed arrows with stick heads are return messages. These are horizontal arrows with the message name written abovethem. Forexample, the Patron sends message 'pay' to the Cashier.Half arrows indicate asynchronous method calls.Simple restaurant sequence diagramThe UML 2.0 Sequence Diagram supports similarnotation to the UML 1.x Sequence Diagram with addedsupport for modeling variations to the standard flow ofevents.Diagram building blocksIf the lifeline is that of an object, it demonstrates a role.Note that leaving the instance name blank can representanonymous and unnamed instances.Example of a UML 2 diagramIn order to display interaction, messages are used. ![]() The arrows represent messages(stimuli) from an actor or object to other objects. The dotted linesextending downwards indicate the timeline. This diagram represents a Patronordering food and wine, drinking wine then eating thefood, and finally paying for the food. This allows the specification of simple runtimescenarios in a graphical manner.For instance, the UML 1.x diagram on the rightdescribes the sequences of messages of a (simple)restaurant system. ![]() OverviewA sequence diagram shows, as parallel vertical lines(lifelines), different processes or objects that livesimultaneously, and, as horizontal arrows, the messagesexchanged between them, in the order in which theyoccur. Itis a construct of a Message Sequence Chart.Sequence diagrams are sometimes called eventdiagrams, event scenarios, and timing diagrams. Sequence diagram 1Sequence diagramA sequence diagram in Unified Modeling Language(UML) is a kind of interaction diagram that shows howprocesses operate with one another and in what order. ![]()
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