They represent conditional structures that affect the flow of messages. In the user authentication process we describe, the messages show how a user enters information into the browser to gain access to the webpage and how the web browser will then cross-check credential to the designated application. A fragment in a sequence diagram is a rectangular frame drawn over part of the diagram. What information is passed from one object to another? To create a Sequence Diagram: n n Select first an element where a new Sequence Diagram to be contained as a child. 652 1 1 gold badge 7 7 silver badges 22 22 bronze badges. The other set of components you must identify are the messages the objects will send. How can I represent this nested if else statement in a UML sequence diagram Is it possible to do so Or is a communication diagram better in this case uml Share. The objects, sometimes called actors, are the principal players that perform tasks and send messages.įor example, in a login sequence, two of the objects would be the potential visitor or user and the login page a visitor uses to interact with the platform they’re attempting to log into. The first necessary set of components are the objects. To accomplish these goals, you must first identify the components of your system that should be diagrammed. Just to add to this answer, as the precondition of being logged is best shown through states, you can either just show state logged in your sequence diagram our you can add opt combined fragment with just state not logged and a ref to another sequence diagram showing logging itself. In the following sequence diagram example, we observe the interactions between a user and a set of participating objects. Sequence Diagram Examples Sequence in MVC Framework Pattern. Not only if else,You can show loops, breaks and parallel etc. Map out a real or hypothetical scenario that has many different components. Draw corresponding sequence diagrams for exception or alternative scenarios. See how objects and components interact with each other in sequence to complete a process. Model how a complex procedure or system operates. You can accomplish several critical tasks with a sequence diagram.
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