![]() ![]() Treat sequence diagrams as a visualization of how objects interact rather than If you want to show control structures like this, you are better off with anĪctivity diagram or indeed with code itself. This isn’t what sequence diagrams are good at. Edit in Dokuwiki Edit in Asciidoc Edit in MarkdownClass DiagramĬlass diagrams are designed using a syntax that mirrors those traditionally employed in programming languages.UML Distilled: A Brief Guide to the Standard Object Modeling Language, 3rd EditionĪ common issue with sequence diagrams is how to show looping and conditional behavior. This resemblance fosters a familiar environment for developers, thereby facilitating an easier and more intuitive diagram creation process. This design approach is not only succinct but also enables the creation of representations that are both concise and expressive. Moreover, it allows for the portrayal of relationships between classes through a syntax that echoes that of sequence diagrams, paving the way for a fluid and insightful depiction of class interactions.īeyond structural and relational representations, the class diagram syntax supports further enrichments such as the inclusion of notes and the application of colors, empowering users to create diagrams that are both informative and visually appealing. You can learn more about some of the common commands in PlantUML to enhance your diagram creation experience. You can also find this file at the bottom of this tutorial. To open a project, select Project > Open from the application toolbar. Now, we want to model the interaction between object instances of these classes in runtime.We have three classes - RegistrationUI, RegistrationController and User. Since the controller class is responsible to control the registration process, add a sub-sequence diagram from it. Move the mouse pointer to RegistrationController. In the New Diagram window, select Sequence Diagram and click Next.Click on the resource icon at the bottom right corner and select New Diagram. Keep the diagram name as provided and click OK to confirm. Right-click on the lifeline and select Select Class > Select Class.Enter registrationUI as the name of lifelife and then press Enter to confirm.Click on the diagram to create a boundary lifeline.Select Boundary Lifeline (B) from the diagram toolbar.This creates an empty UML sequence diagram. In the Select Class window, select the RegistrationUI class and then click OK to confirm.Īfter that, the lifeline will look like the following. Create a Control Lifeline registrationController : RegistrationController and an Entity Lifeline user : User.Don't forget to select the appropriate classes for them. The diagram will look like the following.Let's model the method invocations between lifelines.Move the mouse pointer over lifeline registrationUI.Press on the Resource Catalog resource and drag it out.Move to lifeline registrationController and release the mouse button.This pops up a list of name that you can choose for the new sequence message.You can see that those are operation of classRegistrationController.Relate lifeline registrationController and user.We say that registrationController creates the user lifeline. Therefore, we need to relate them with a create message. Move the mouse pointer over the activation in lifeline registrationController.Press on the resource Resource Catalog and drag it out.Release the mouse button on the lifeline user. ![]() Select Create Message from Resource Catalog.Ĭreate message is created.Create messages setName and setPassword from lifeline registrationController to user. ![]()
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