Sequence DiagramThe sequence diagram represents the flow of messages in the system and is also termed as an event diagram. It helps in envisioning several dynamic scenarios. It portrays the communication between any two lifelines as a time-ordered sequence of events, such that these lifelines took part at the run time. In UML, the lifeline is represented by a vertical bar, whereas the message flow is represented by a vertical dotted line that extends across the bottom of the page. It incorporates the iterations as well as branching. Purpose of a Sequence Diagram
Notations of a Sequence DiagramLifelineAn individual participant in the sequence diagram is represented by a lifeline. It is positioned at the top of the diagram. ![]() ActorA role played by an entity that interacts with the subject is called as an actor. It is out of the scope of the system. It represents the role, which involves human users and external hardware or subjects. An actor may or may not represent a physical entity, but it purely depicts the role of an entity. Several distinct roles can be played by an actor or vice versa. ![]() ActivationIt is represented by a thin rectangle on the lifeline. It describes that time period in which an operation is performed by an element, such that the top and the bottom of the rectangle is associated with the initiation and the completion time, each respectively. ![]() MessagesThe messages depict the interaction between the objects and are represented by arrows. They are in the sequential order on the lifeline. The core of the sequence diagram is formed by messages and lifelines. Following are types of messages enlisted below:
NoteA note is the capability of attaching several remarks to the element. It basically carries useful information for the modelers. ![]() Sequence Fragments
![]() Types of fragmentsFollowing are the types of fragments enlisted below;
Example of a Sequence DiagramAn example of a high-level sequence diagram for online bookshop is given below. Any online customer can search for a book catalog, view a description of a particular book, add a book to its shopping cart, and do checkout. ![]() Benefits of a Sequence Diagram
The drawback of a Sequence Diagram
Next TopicUML Collaboration Diagram
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