UML Class Diagram

Question

I have a design class diagram using the boundary, control, entity pattern:

Are the following links allowed:

boundary to boundary ?
control to control?

I don't see a question among all these words. What are you asking? — Jim L., Apr 09 '16 at 01:20
You now have the chart, but what is it that you are actually asking? Can you expand on the question some more? — Lilith Daemon, Apr 09 '16 at 04:36
@ChrisBritt His question is, whether the associations between boundaries and between controls are ok. Well, what can be said? — qwerty_so, Apr 09 '16 at 05:48

Christophe · Accepted Answer · 2022-10-05T11:58:42.177

2

The ECB pattern is meant to ease implementation of use-cases. In its philosophy, controls implement use cases, boundaries the relation of use cases with external world, and entities, the business data that is managed by the use cases.

So only the following links should be allowed:

             Entity     Boundary   Control
Entity         X                      X
Boundary                              X
Control        X           X          X

You see that boundary to boundary is not allowed. Boundaries can only be linked to actors or to controls.

Control to control is allowed, but you haven't any.

An additional question is the kind of link that should be represented. Is it really plain association (i.e. structural, one end is a property of the other) ? Or is it a usage dependency (i.e. a dashed line with the stereotype <<use>> would be more appropriate) ? I'd opt for the first alternative between entities, but the second with controls and boundaries.

edited Oct 05 '22 at 11:58

answered Apr 10 '16 at 00:06

Christophe

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"An additional question is the kind of link that should be represented. Is it really plain association (i.e. structural, one end is a property of the other) ? Or is it a usage dependency (i.e. a dashed line with the stereotype <> would be more appropriate) ? I'd opt for the first alternative between entities, but the second with controls and boundaries. " ? i didn't understand u very well actually !! but thanks any way – KhaoulaAtallah Apr 10 '16 at 15:08
I want to know why Boundary to Boundary isn't allowed. If we have two pages both using the same component such as a list item, can I link them together? – SiegeSailor Oct 05 '22 at 06:54
1

@SiegeSailor This constraint is only at high level, where a boundary corresponds to a while user interface of a use case. Of course a boudary could be decomposed into several related boundaries. I’ll update with a linked wikipedia article which explains this better under section “robustness diagram” – Christophe Oct 05 '22 at 11:56

UML Class Diagram

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