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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Sat, 04/13/2013 - 09:11
Responding to George...

I just see that as basic trading off of behavior vs. data in the design.
The Clerk can interact directly by sending an asynchronous I'm Done
event that triggers a transition somewhere else or it can set an
attribute that somebody else looks at synchronously.

I then think once you opt for the design strategy of solving the problem

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Sat, 04/13/2013 - 09:11
Responding to Mercer-Hursh...

Fine. I'm just saying that it's not a universal solution. You don't want
to methodologically say, "Oh, I've got distributed communications,
therefore I must use publish/subscribe."

That's another low level implementation issue. It is still touted as
publish/subscribe and it will work just fine for *:* relationships with,

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Sat, 04/13/2013 - 09:11
"OK. But isn't that the assumption one always makes with distributed
(external) bridges (i.e., the receiver can't know why it is getting the
message; only what it should do with it)?" - H.S. Lahman

The receiver isn't getting a message at all but somehow knows that the
observed object's attributes changed value. Could be polling or whatever.

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
I think that is about as close as we are going to get! :)

> an object on steroids and all the same methodological ideas apply to
> interactions between them. That's why we have formalisms like the
> Bridge Model.

Whereas, I would be inclined to say that they were very similar, but not

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Responding to George...

Clearly I have too much time on my hands lately...

In my misspent youth I was a field geologist. Geologists are the only
people who regard rain as good working weather -- because it keeps the
deer flies off.

OK. But isn't that the assumption one always makes with distributed

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Responding to Mercer-Hursh...

Possibly. B-) One way of viewing a subsystem, though, is that it is an
object on steroids and all the same methodological ideas apply to
interactions between them. That's why we have formalisms like the Bridge
Model.

When you get into things like DDS, it becomes a default infrastructure.

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understanding class/classifier,modeling/design

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Hello
When i read through UML specification there is two words i am not sure if
both have the same meaning or not, those words are: class and classifier
What is the differences between them?
also have another question:
What is the differences between modelling and design?
Sincerely
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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
> the publisher and subscriber are both talking to the right channel,
> topic, queue, or whatever. The channel, or whatever, has identity and
> both need to map that identity properly through the intermediary
> during registration.

I think we have clarified the difference between model and

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Use case diagram for illustrating decisions

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Use written scenarios activity diagrams to express decisions. I would show this as a single business level use case. The primary actor wants to change the curriculum and the other actors get involved in trying to achieve this goal.
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Use Case, Use Case Scenario and Use Case Diagrams

UML Forum Google Group - Thu, 04/11/2013 - 16:01
A use case is a collection of scenarios organized about one primary actor and their tangible goal. The main scenario shows how the user gets what they want when everything works perfectly and simply. Most of the other scenarios start with something not working and show how to work round it. Scenarios are a sequence of steps most of which have a user action followed by a system response.
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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
I'm getting good at marching in the rain. I live in Northwestern Oregon :).

I recently got a rude awakening wrt to synchronous access to properties. I
naively supposed that the compiler writers had a solution for distributed
objects. Nope. So, yes, I'm gaining appreciation for compromise. Still, it

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Darn... these are good points. I wishfully wanted to limit DDS to providing
attributes and calling it good. I will be compromising the goals of the
architecture if there is any form of message passing. Rationalizing the DDS
events as "essentially the same thing" as OOA events is not working. I had
Categories: Communities

Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Responding to Mercer-Hursh...

That's an implementation detail. Somebody, somewhere has to make sure
the publisher and subscriber are both talking to the right channel,
topic, queue, or whatever. The channel, or whatever, has identity and
both need to map that identity properly through the intermediary during

Categories: Communities

Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Thu, 04/11/2013 - 16:01
Responding to George,

At the risk of raining on your parade, I don't think it is that simple
in general. I agree that is true for what we would consider external
bridges. However, I don't think that is true for design /within
/subsystems at the object level.

With the technologies we have today, I don't think it is possible to be

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Use case diagram for illustrating decisions

UML Forum Google Group - Tue, 04/09/2013 - 13:19
Hello everyone,
This is my first UML project and I am having a little trouble drawing a use
case diagram.
Here's what I'm trying to do:
An instructor wants to edit a syllabus. He sends an edit request to the
convenor, who can either approve the edit (if changes are minor) or refer
the edit to the curriculum committee, who can either approve or reject the
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Use Case, Use Case Scenario and Use Case Diagrams

UML Forum Google Group - Tue, 04/09/2013 - 13:19
Hello, this is my first post. I hope I am not asking a stupid question:)
I am having a little trouble differentiating these three concepts.
From what I understand, a use case is a sheet describing the use case
identification (actor, level, etc), the steps performed, and the
assumptions.
A use case scenario is a written text describing an event? Or is it an
Categories: Communities

Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Tue, 04/09/2013 - 13:19
Dan, that's a wonderfully clear, precise and comprehensive
description of the situation.  Couldn't agree more.

- Scott.

<aside author="H.S. Lahman" >

This is why I said to George that I think coupling is largely
irrelevant at the OOA/D level. You already have a minimum coupling

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RE: [UML Forum] how to rep composition with a set of entities?

UML Forum Google Group - Tue, 04/09/2013 - 13:19
UML has unions and intersections in aggregation.

-----Original Message-----
Of dotnetguy
Sent: Sunday, April 07, 2013 2:18 AM
To: umlforum@googlegroups.com

Hello - Say entity X has a composite (1:1) relationship with entity Y and
also with entity Z. However, entity X should be allowed to have more than

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Re: [UML Forum] Data-Centric vs. Object-Oriented

UML Forum Google Group - Tue, 04/09/2013 - 13:19
<aside author="H.S. Lahman" >
This is why I said to George that I think coupling is largely irrelevant at
the OOA/D level. You already have a minimum coupling specification of the
semantics in OOA/D. You depend on the OOP developer to do the right thing
when implementing it. Shameless plug: And if you are a translationist, you
Categories: Communities

Re: [UML Forum] how to rep composition with a set of entities?

UML Forum Google Group - Tue, 04/09/2013 - 13:19
Responding to dotnetguy...

Not if X has a 1:1 relationship with each. If X can be related to more
than 1 Y or Z, then the relationship must be 1:*.

Then the 1:1 multiplicity captures that; X can't be related to more that
one pair of Y and Z at a time.

Note that the notion of specific combinations of Y and Z implies that

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