Contents
How do you show repetition in a sequence diagram?
Sequence diagram repetition using an iteration expression within a generic-form interaction. Alternatively, a guard expression may be used at the top-inside or bottom-inside of the rectangle to indicate the condition that must be satisfied in order to terminate the repetition.
How do you show error handling in a sequence diagram?
UML provides neither notation to model exception handling in sequence diagrams nor any reasoning why it is absent. Some clumsy approaches to model try-catch blocks are by utilizing combined fragments – alt (alternatives) and breaks, while adding stereotypes for reply messages representing thrown exceptions.
How do you show a while loop in a sequence diagram?
To show a loop, you use the loop operand with a single fragment and put the basis of the iteration in the guard. For conditional logic, you can use an alt operator and put a condition on each fragment. Only the fragment whose guard is true will execute. If you have only one region, there is an opt operator.
How do you loop in a sequence diagram?
Below are the steps on how to represent a loop:
- Create a sequence diagram.
- Place two objects on the sequence diagram.
- Draw a message from one object to the other.
- Draw a note over the message and add a description (for example, “Messages 2 through 4 are repeated.”)
How are the parts of a sequence diagram represented?
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. A Quick Overview of the Various Parts of a Sequence Diagram
When to use dotted arrow in sequence diagram?
The sequence -> is used to draw a message between two participants. Participants do not have to be explicitly declared. To have a dotted arrow, you use –> It is also possible to use <- and <–. That does not change the drawing, but may improve readability.
How to show ” if ” condition on a sequence diagram?
In Visual Studio UML sequence this can also be described as fragments which is nicely documented here: https://msdn.microsoft.com/en-us/library/dd465153.aspx Highly active question. Earn 10 reputation (not counting the association bonus) in order to answer this question.
How to specify the reference fragment in 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. For more sequence fragments refer to Beyond the Basics of Sequence Diagrams: Part 1, Part 2 and Part 3.