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What is the lifeline in sequence diagram?
A lifeline represents an individual participant in a sequence diagram. A lifeline will usually have a rectangle containing its object name. If its name is “self”, that indicates that the lifeline represents the classifier which owns the sequence diagram.
How can you represent the object lifeline in a sequence diagram?
This dashed vertical line shows the sequential events that occur to an object during the charted process. Lifelines may begin with a labeled rectangle shape or an actor symbol. Used to model if/then scenarios, i.e., a circumstance that will only occur under certain conditions.
Which of the following is a component of a sequence diagram?
The following nodes and edges are typically drawn in a UML sequence diagram: lifeline, execution specification, message, combined fragment, interaction use, state invariant, continuation, destruction occurrence. Major elements of the sequence diagram are shown on the picture below.
What do life lines mean in sequence diagram?
Sequence diagram life lines represent different processes or objects that live simultaneously.Lifelines represent only one interacting entity.It is basically a vertical dashed line that represents existence of an object over a period of time.This line disappears when the object is destroyed.As for example see the diagram below:
What is the lifeline notation in UML diagram?
Lifeline Notation The object notation of a UML Sequence Diagramis a rectangle with it’s lifeline (a dashed line) descending from the center of its bottom edge. This element represents the life span of the object during the scenario being modeled.
When to use Lifeline notation with an actor element?
A lifeline notation with an actor element symbol is used when the particular sequence diagram is owned by a use case. A lifeline with an entity element represents system data. For example, in a customer service application, the Customer entity would manage all data related to a customer.
How are messages represented in a sequence diagram?
Sequence Diagram Notations. A sequence diagram is structured in such a way that it represents a timeline which begins at the top and descends gradually to mark the sequence of interactions. Each object has a column and the messages exchanged between them are represented by arrows.