#A SEQUENCE DIAGRAM EXAMPLE SOFTWARE#

Place the condition for exiting the loop at the bottom left corner in square brackets. To build a sequence diagram, use a UML Sequence template or starter diagram, which includes the UML Sequence stencil.

When that object's lifeline ends, you can place an X at the end of its lifeline to denote a destruction occurrence.Ī repetition or loop within a sequence diagram is depicted as a rectangle. Objects can be terminated early using an arrow labeled '>' that points to an X. Lifelines are vertical dashed lines that indicate the object's presence over time. Asynchronous messages are sent from an object that will not wait for a response from the receiver before continuing its tasks. They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. Use half-arrowed lines to represent asynchronous messages. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case. Messages are arrows that represent communication between objects.

#A SEQUENCE DIAGRAM EXAMPLE SOFTWARE#

When an object is busy executing a process or waiting for a reply message, use a thin gray rectangle placed vertically on its lifeline. Overview A sequence diagram or system sequence diagram (SSD) shows process interactions arranged in time sequence in the field of software engineering. Use the UML object symbol to illustrate class roles, but don't list object attributes.Īctivation boxes represent the time an object needs to complete a task.

Class roles describe the way an object will behave in context.

A sequence diagram example