2 Aug
2012
2 Aug
'12
11:57 a.m.
A simple example.
If you create a model with the package Fame-Util, then, inspect such
package:
"1"
(self classes flatCollectAsSet: [ :each | each queryOutgoingDependencies
atPackageScope ]) size " = 7"
"2"
(self queryOutgoingDependencies atPackageScope asSet) size " = 12"
What in a first moment is strange. At least when we are implementing
metrics..
We would expect the same outgoing references (same size) bor both class
level (1) and package level (2).
I know that the second one is bigger because it checks all methods,
including extensions....but....
On Thu, Aug 2, 2012 at 9:32 AM, Tudor Girba <tudor(a)tudorgirba.com> wrote:
Hi,
I still do not understand :).
Let's be more specific. As I understand we could use the following example:
- package A = FAMIX-Core
- package B = Mondrian
- package C = Moose-Finder
The Moose-Finder extends FAMIX entities with visualization methods
that depend on Mondrian. This decision was taken exactly so that FAMIX
does not depend on Mondrian. So, why would you want to see FAMIX-Core
depend on Mondrian?
Cheers,
Doru
On Thu, Aug 2, 2012 at 9:24 AM, Nicolas Anquetil
<Nicolas.Anquetil(a)inria.fr> wrote:
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Andre Hora
we work on coupling metrics that measure how much a package depends on
other
packages (can you reuse it without the others).
Even if it is trough a method added by extension, if package A use
something
in package B, then A needs B (or if you prefer
A+C needs B)
The current semantic does not show this because the extending method
will be
part of package C (the one that introduces the
extension) and therefore C
will depend on B (which seem correct to me), but A will not depend on B
...
So with extensions, we can consider that both A and C depend on B.
This is something that the coupling metrics do not consider.
So we have to make a choice.
For coherence with the same experiment on Java systems, we prefer to say
that only A depends on B.
But tis is not how famix and moose chef see things ...
Additionaly, we have a metric whose results are useless in the presence
of
extensions.
nicolas
On 01/08/12 20:39, Tudor Girba wrote:
>
> Hi Nicolas,
>
> The current semantics for both methods and queryOutgoingReferences are
> quite fine.
>
> As I understand you want to count the amount of references that the code
> inside a package induces. So, this includes both the extension methods
and
> the defined methods. Why do you see this as a
problem?
>
> Cheers,
> Doru
>
>
> On 31 Jul 2012, at 16:21, Nicolas Anquetil wrote:
>
>> Another MooseChef decision:
>>
>> aPackage queryOutgoingReferences
>>
>> returns all the FamixReferences made from aPackage.
>>
>> this is implemented by taking all methods (self methods) in the package
>> and asking them what reference they make.
>>
>> And we have
>> FAMIXPackage>>methods
>> ^ self localMethods union: self extensionMethods
>>
>> So when asking a package what external references it makes, we get
>> references stemming from methods that extend classes of other packages.
>>
>> We found this while computing a coupling metric for packages.
>>
>> So the solution would be easy to implement, but we are not sure what is
>> the best solution ?
>>
>> - we could change FAMIXPackage>>methods (methods belong to the package
>> that owns their class)
>> - we could change queryOutgoingReferences
(references/invocation/accesses
>> stem from the methods in the classes in
the package, not from the
methods in
the package)
- or we could change our metric
nicolas
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