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Link Lifeline to Class in Sequence Diagrams [message #660143]

Thu, 17 March 2011 03:28

Thiago Figueredo Cardoso

Messages: 5
Registered: March 2011

Junior Member

Hi,

I created a simple Class Diagram containing two classes, Master and Slave, with a usage relationship (Master->Slave).

Now I'm trying to create a Sequence Diagram, but I can't link a Lifeline on the diagram with any of the classes. I instantiated a Lifeline but when I try to select the object this Lifeline represents, nothing appears on the selection window ("Select Represents").

Is this a bug or I'm doing it the wrong way?

Thanks in advance,

--
Thiago Figueredo

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Re: Link Lifeline to Class in Sequence Diagrams [message #661352 is a reply to message #660143]

Thu, 24 March 2011 10:55

Vincent

Messages: 35
Registered: December 2009

Member

That is because the Lifeline does not represent a Class.

Actually, in UML 2.0 a Lifeline represent an ConnectableElement object, hence an instance object which is typed by a Class.

The reason why you can not select any element is that you have not created any instance of Master nor Slave in your UML model.

A ConnectableElement can be Parameter, Property, ExtensionEnd , Port or Variable.

I do not know exactly how you can create such an instance in an appropriate manner for your case, but I hope it helps.

Vincent.

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Re: Link Lifeline to Class in Sequence Diagrams [message #661974 is a reply to message #661352]

Mon, 28 March 2011 16:57

Thiago Figueredo Cardoso

Messages: 5
Registered: March 2011

Junior Member

Hi Vincent,

That solved my problem. Smile

I wasn't aware of the details of UML 2.0 and I was expecting to model the way I do in other tools.

Thanks.

Thiago

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Re: Link Lifeline to Class in Sequence Diagrams [message #664145 is a reply to message #661974]

Thu, 07 April 2011 15:51

No real name

Messages: 1
Registered: April 2011

Junior Member

Hi Thiago/Vincent,

I've found one method to associate a lifeline to a class, but this is a workaround and I wondered if you'd found the correct way.

I presently create a property for a class, whose type I then set to the class itself, creating a recursive loop. I can then reference this property in the lifeline.

It seems to me, this adds unnecessary (and incorrect) information for the model. Do you have a better solution?

Thanks in advance, William

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Re: Link Lifeline to Class in Sequence Diagrams [message #664152 is a reply to message #660143]

Thu, 07 April 2011 16:14

Thiago Figueredo Cardoso

Messages: 5
Registered: March 2011

Junior Member

William,

I was doing this you described. I noticed that when you create an association between two classes, properties are created, so you may use them (it seems more accurate).

In my case, my classes weren't assoaciated to any other, so I created another class representing the top-level entity (System) and made the associations.

Thiago

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