That makes this kind of system perfect for describing with a sequence diagram. Making a purchase online involves a lot of back and forth between the user, the store, the payment gateway, and even potentially a bank, if a transfer is involved. Step-by-step guide to creating a sequence diagram for an online shopping system You might even like to keep this open while you go through this guide. Ĭheck out our detailed page on sequence diagrams for a full rundown on the elements and a pro cheat sheet for using Gleek syntax to create them.
Make your own UML sequence diagram with Gleek. These are shown in a special frame in the diagram and let you create complex alternative paths for the system.
You can also model situations where one or more optional or alternative events take place. Each object has a lifeline that descends vertically and this lifeline will show an activation bar if the object is active. These messages are shown as arrows that can go both left and right. Objects are activated as messages travel back and forth on the horizontal axis. Sequence diagrams use a horizontal axis for the objects being modeled, with the vertical axis showing how time progresses from top to bottom.
Sequence diagrams help a software engineer or developer visualize the order in which events occur and how they trigger activity within the system. While some of these diagrams, such as class diagrams or object diagrams, are designed to show the static structure of a system, a sequence diagram shows how the system behaves over time and how the different parts of the system interact during that time frame.Ī sequence diagram captures messaging between objects in a system and indicates which object is active at any particular point in the process of carrying out operations. Sequence diagrams are one of the 14 different types of Unified Modeling Language (UML) diagrams.
What is the purpose of sequence diagrams?
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