What is self message in sequence diagram?
What is self message in sequence diagram?
A Self-Message reflects a new process or method invoked within the calling lifeline’s operation. It is a specification of a Message, typically in a Sequence diagram. Self-Message Calls indicate a nested invocation; new activation levels are added with each Call.
What is reference in sequence diagram?
An interaction occurrence (or reference sequence diagram) enables you to refer to another sequence diagram from within a sequence diagram. This functionality enables you to break down complex scenarios into smaller scenarios that can be reused.
What are the strengths and weakness of sequence diagram?
What are the Strengths and Weaknesses of Sequence vs. Communication Diagrams?
| Type | Strengths | Weaknesses |
|---|---|---|
| communication | space economical—flexibility to add new objects in two dimensions | more difficult to see sequence of messages fewer notation options |
What is used to reference another interaction?
To reference other interactions in a UML sequence diagram, interaction uses can be used. An interaction use is a fragment that uses or calls another interaction. It is shown in the sequence diagram as a fragment with the operator ref to indicate the reference to another interaction.
What is the main objective of the sequence diagram?
A sequence diagram is a type of interaction diagram because it describes how—and in what order—a group of objects works together. These diagrams are used by software developers and business professionals to understand requirements for a new system or to document an existing process.
What are the disadvantages of sequence diagram?
Drawbacks of a sequence diagram Sequence diagrams can become complex when too many lifelines are involved in the system. If the order of message sequence is changed, then incorrect results are produced. Each sequence needs to be represented using different message notation, which can be a little complex.
What is a lifeline in a 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.
What does dotted line mean in sequence diagram?
reply messages
Solid arrow heads represent synchronous calls, open arrow heads represent asynchronous messages, and dashed lines represent reply messages.
