uml sequence diagram for online shopping system

Once the page has loaded, you’re usually presented with a form that allows you to enter your credentials, or in other words the information that you used to sign up for the site. So what actually happens when you arrive on the login page for your favorite website? That’s exactly what a sequence diagram is designed to show. Behind the scenes, any login page involves messages being sent back and forth, objects being activated, and responding with data, and it happens over a discrete period of time. How can you create a sequence diagram for a login system?Ī great example of sequence diagrams is a user login system. For much more detail, you should check out our sequence diagram page on Gleek.

That gives you an overview of what to expect from a sequence diagram. The arrows are usually labeled so that you can easily understand the content of the message. Messages can be sent back and forth, from left to right, and the arrow shows which is the receiver and which the sender of the message. These messages are represented by a line with an arrow. Each object can also have an activation bar on its lifeline that will show when it is active in the system and accepting or processing information from another object.Īctivity in the system is shown by messages that pass between the objects. These lifelines are shown by parallel vertical lines that can never overlap.

Each object has a lifeline that represents its existence in time. The diagram shows the objects, or actors, involved in the system. Make your own UML sequence diagram with Gleek. The sequence diagram lets a developer sketch out and demonstrates how processes will behave and interact in sequence.

What is a sequence diagram and what is it used for?Ī sequence diagram is a type of UML (Unified Modelling Language) diagram that is used to model interactions between objects in a system over time.

Uml sequence diagram for online shopping system