Sequence Diagram - ref fragment

General Questions/Discussions
1

Hi,
Is there a way to create a “ref” fragment box in a Sequence Diagram? I couldn’t find it as an option. I saw “alt, opt, loop, etc…” but no ref to indicate the action points to another sequence diagram. Also, how can I display a “1” on a lifeline object to indicate that its a Singleton?
Thanks…

2

Hello millerwf,

You can create “ref” combined fragment using the Interaction Use button (see attached pic). Feel free to contact me if you need any help.

Best regards,
Rain

ref_combined_fragment.png

3

Thanks Rain,
I figured it out last night, but still have a couple of issues.

  1. Once I’ve gotten the “ref” fragment how do I get a pointer (message) from a lifeline to the “ref” fragment?
  2. How do I display a lifeline object as a singleton in the diagram. In the examples I’ve seen in books and the internet, a singleton in a sequence diagram typically has a “1” in the upper right corner of the object. I can’t see anyway to show this concept. Is it even possible?

Bill

singleton.jpg692×131 13.6 KB

singleton.jpg

4

Any help???

5

Hello Millerwf,

We are sorry that we do not support modeling singleton in the lifeline using the “1”. In fact, it seems the “1” inside lifeline is not a standard in UML notation. May I know where you find this?

BTW, I think you can create your own stereotype for lifeline to model the singleton behavior.

Best regards,
Rain