weramemory.blogg.se - System sequence diagram online shopping login

Activation bars - are empty boxes placed below the lifelines that represent the time it takes for an object to complete a task.

Lifelines - are box-shaped elements located at the top of the diagram that can represent object instances or roles that play a role in the sequence.

Actors - can be represented by a user or another entity that may be interacting with the system.Our UML sequence diagram template comes with a set of standard notations that must be known by all users.

Every object will have its column, and all the messages exchanged between objects will be represented by arrows. What are the elements of a sequence diagram?Īs these diagrams represent event timelines, they will start at the top and then gradually descend, marking the consecutive sequences of interactions.