How do you reference a sequence diagram?
To specify the reference fragment, you have to mention ‘ref’ in the name box of the frame and the name of the sequence diagram that is being referred to inside the frame.
What is the best UML book?
Top 5 UML Books for Java Developers
- UML Distilled by Martin Fowler.
- UML for Java Programmers by Robert C. Martin.
- Enterprise Java with UML, by C. T. Ariington.
- The Unified Modeling Language User Guide by Grady Booch et All.
What is ref in UML diagram?
ref Reference: refers to an interaction defined on another diagram. The frame is drawn to cover the lifelines involved in the interaction. You can define parameters and a return value. sd Sequence diagram: used to surround an entire sequence diagram. Massimo Felici.
Is PlantUML open source?
PlantUML is free and open source and will always be. Those messages are usually generated on welcome or error images and never on fonctional diagrams.
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 ALT in sequence diagram?
alt is used to describe alternative scenarios of a workflow. Only one of the options will be executed. opt is used to describe optional step in workflow. For example, for online shop purchase sequence diagram you may use opt to describe how user can add gift wrapping if she wishes.
Is PlantUML free?
PlantUML is free and open source and will always be. So PlantUML can occasionally display sponsored or advertising messages. Those messages are usually generated on welcome or error images and never on fonctional diagrams.
Is PlantUML a programming language?
Using PlantUML, you can write a plain text description and it will give you a UML diagram. It’s not a programming language (no conditional/looping constructs), more of a declarative language like SQL. It’s built on top of the GraphViz tool, which uses the “DOT” language for specifying generic diagrams.
What is the purpose of sequence diagram?
The sequence diagram is a good diagram to use to document a system’s requirements and to flush out a system’s design. The reason the sequence diagram is so useful is because it shows the interaction logic between the objects in the system in the time order that the interactions take place.
What are two benefits of sequence diagramming?
Benefits of a Sequence Diagram Sequence diagrams are used to represent message flow from one object to another object. Sequence diagrams are easier to maintain. Sequence diagrams are easier to generate. Sequence diagrams can be easily updated according to the changes within a system.
What is the objective of sequence diagram?
The diagram’s purpose The sequence diagram is used primarily to show the interactions between objects in the sequential order that those interactions occur.
What is lifeline in sequence diagram?
Lifelines. 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 is par in UML?
Parallel. The interaction operator par defines potentially parallel execution of behaviors of the operands of the combined fragment. Different operands can be interleaved in any way as long as the ordering imposed by each operand is preserved.
What is self call 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 a sequence diagram?
A sequence diagram is an interaction diagram that emphasizes the time ordering of messages sent between objects. It shows a set of objects or roles and messages sent and received by them. Sequence diagram has two features that distinguish them from communication diagrams—presence of lifeline and focus of control.
What is a reference fragment in a sequence diagram?
Reference Fragment. You can use the ref fragment to manage the size of large sequence diagrams. It allows you to reuse part of one sequence diagram in another, or in other words, you can reference part of a diagram in another diagram using the ref fragment.
What is the balance lookup sequence diagram?
The sequence starts at the top left, with the customer sending a message to the teller object. The teller object sends a message to the theirBank object. At that point, the Balance Lookup sequence diagram is called, with the accountNumber passed as a parameter. The Balance Lookup sequence diagram returns the balance variable.
Do you need a sequence diagram for expressive code?
And if the code is expressive and can stand on its own, there’s no need to draw a sequence diagram in the first place. A sequence diagram represents the scenario or flow of events in one single use case. The message flow of the sequence diagram is based on the narrative of the particular use case.