UML Sequence Diagrams are interaction diagrams that detail how operations are carried out. They capture the interaction between objects in the context of a collaboration. Sequence Diagrams are time focus and they show the order of the interaction visually by using the vertical axis of the diagram to represent time what messages are sent and when.
- Simple Sequence Diagram for PowerPoint is a group of quality PowerPoint diagrams that depict outlines and process flows. Download Process Flow PowerPoint Templates at the SlideModel gallery. You must be logged in to download this file.
- Sequence fragments have been introduced by UML 2.0, which makes it quite easy for the creation and maintenance of an accurate sequence diagram. It is represented by a box called a combined fragment, encloses a part of interaction inside a sequence diagram.
Creating a Sequence Diagram from a Class
- Download Simple-Registration.vpp. You can also find this file at the bottom of this tutorial.
- Open the downloaded .vpp file in Visual Paradigm. To open a project, select Project > Open from the application toolbar.
- Open the class diagram Registration. Study the diagram content. We have three classes - RegistrationUI, RegistrationController and User.
- Now, we want to model the interaction between object instances of these classes in runtime. Since the controller class is responsible to control the registration process, add a sub-sequence diagram from it. Move the mouse pointer to RegistrationController. Click on the resource icon at the bottom right corner and select New Diagram... from the popup menu.
- In the New Diagram window, select Sequence Diagram and click Next. Keep the diagram name as provided and click OK to confirm. This creates an empty UML sequence diagram.
Drawing the Sequence Diagram
- Select Boundary Lifeline (B) from the diagram toolbar.
- Click on the diagram to create a boundary lifeline.
- Enter registrationUI as the name of lifelife and then press Enter to confirm.
- Right-click on the lifeline and select Select Class > Select Class... from the popup menu.
- In the Select Class window, select the RegistrationUI class and then click OK to confirm.
After that, the lifeline will look like the following.
- Create a Control LifelineregistrationController : RegistrationController and an Entity Lifelineuser : 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.
- Select Message from Resource Catalog.
- 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. Select createUser(name, password).
- 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.
Create message is created. Your diagram should look like this:
- Create messages setName and setPassword from lifeline registrationController to user. Up to now, the diagram becomes:
- You can also specify the arguments of operations. Take the message createUser(name, password) as example. Right-click on it and select Open Specification... from the popup menu.
- Edit the action type property by clicking on the button with dotted caption, next to Action type.
- In the Call Action Specification window, click Add > Text... to add an argument. In this example, click Add > Text... to add argument peter. Click Add > Text... again to add argument mypwd. Note that the two arguments are actually referring to the two parameters given by the operation. If you add the third argument here, it will be ignored (as there are only two operations defined).
- Click OK to close the windows and go back to diagram. The arguments are added and presented on diagram. Finally the diagram become:
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UML Sequence Diagram
Easy Leave Sequence Diagram
Within GenMyModel, you can create your sequence diagram online, share and export images. Everything is handled in your web-browser with an intuitive user interface. The sequence diagrams conform the UML2 standard. You get both a visual representation, called the diagram, and the internal structure of your model in a tree-based representation. It works on Windows, Mac, Linux and the supported browsers are IE, Chrome, Firefox, Safari and Opera.
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Unified Modeling Language
Sequence Diagram Tutorial
A sequence diagram in the Unified Modeling Language (UML) is an interaction diagram that shows how processes operate with one another and in what order. UML sequence diagrams model the flow of logic within your system in a visual manner, enabling you both to document and validate your logic, and are commonly used for both analysis and design purposes. Sequence diagrams are the most popular UML artifact for dynamic modeling, which focuses on identifying the behavior within your system.
The sequence diagram is a construct of a message sequence chart. A sequence diagram shows object interactions arranged in time sequence. It depicts the objects and classes involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario. Sequence diagrams are typically associated with use case realizations.
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A sequence diagram shows, as parallel vertical lines (lifelines), different processes or objects that live simultaneously, and, as horizontal arrows, the messages exchanged between them, in the order in which they occur. This allows the specification of simple runtime scenarios in a graphical manner.
Sequence diagrams are typically used to model usage scenarios, the logic of methods and the logic of services.
Sequence Diagram Tool
Sequence Diagram Examples
GenMyModel comes with many free examples, clonable in just a click. You can access these designed templates from the dashboard area. The examples contain sequence diagrams but also class diagrams, use case diagrams and activity diagrams.
The Restaurant example designed in GenMyModel