About model level metrics

Tx you guys for the answers!!

I cannot reply directly

Now we found a crazy in Pharo. Believe or not 

And I’m curious if you can reproduce it

We wrote this method in FamixClass

FAMIXClass >> TR_LCOM

<MSEProperty: #TR_LCOM type: #Number>

<MSEComment: 'lack of cohesion in methods from Understand'>

<derived>

^ self propertyNamed: #TR_LCOM

And since it is about Understand metrics

FAMIXClass >> Und_LCOM

<MSEProperty: #Und_LCOM type: #Number>

<MSEComment: 'lack of cohesion in methods from Understand'>

<derived>

^ self propertyNamed: #Und_LCOM

And this looks forever….. when we use Und_ :)

Crazy no.

Can you reproduce it?

On 12 Sep 2017, at 11:58, Stéphane Ducasse <[hidden email]> wrote:

Hi 

for certain metrics we need to compute the total amount of lines of code for the complete project.

FAMIXClass >> calculateARLCOMUnderstand

"Class LCOM LOC

C1  12 1000

C2     2  50

For C1 1000/1050 * 12

For C2 50/1050 * 2

"

self halt.

^ self TR_LoC / self mooseModel TR_totalNumberOfLinesOfCode * self TR_LCOM

Now I have a question because totalNumberOfLinesOfCode does exist on Model but on TypeGroup

I wrote it like that on FAMIXTypeGroup 

TR_totalNumberOfLinesOfCode

<MSEProperty: #TR_totalNumberOfLinesOfCode type: #Number>

<derived>

<MSEComment: 'Total number of lines of code from Understand'>

^ self

lookUpPropertyNamed: #TR_totalNumberOfLinesOfCode

computedAs: [ (self sumNumbers: [ :each | each TR_LoC ]) asFloat ]

How can I access for example totalNumberOfLinesOfCode at the model level?

Stef

--------------------------------------------

Stéphane Ducasse

http://stephane.ducasse.free.fr

http://www.synectique.eu / http://www.pharo.org 

03 59 35 87 52

Assistant: Julie Jonas 

FAX 03 59 57 78 50

TEL 03 59 35 86 16

S. Ducasse - Inria

40, avenue Halley, 

Parc Scientifique de la Haute Borne, Bât.A, Park Plaza

Villeneuve d'Ascq 59650

France

--------------------------------------------

Stéphane Ducasse

http://stephane.ducasse.free.fr

http://www.synectique.eu / http://www.pharo.org 

03 59 35 87 52

Assistant: Julie Jonas 

FAX 03 59 57 78 50

TEL 03 59 35 86 16

S. Ducasse - Inria

40, avenue Halley, 

Parc Scientifique de la Haute Borne, Bât.A, Park Plaza

Villeneuve d'Ascq 59650

France

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Moose-dev mailing list
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On 12/09/2017 11:58, Stéphane Ducasse wrote:

Hi 

for certain metrics we need to compute the total amount of lines of code for the complete project.

FAMIXClass >> calculateARLCOMUnderstand

"Class LCOM LOC

C1  12 1000

C2     2  50

For C1 1000/1050 * 12

For C2 50/1050 * 2

"

self halt.

^ self TR_LoC / self mooseModel TR_totalNumberOfLinesOfCode * self TR_LCOM

Now I have a question because totalNumberOfLinesOfCode does exist on Model but on TypeGroup

I wrote it like that on FAMIXTypeGroup 

TR_totalNumberOfLinesOfCode

<MSEProperty: #TR_totalNumberOfLinesOfCode type: #Number>

<derived>

<MSEComment: 'Total number of lines of code from Understand'>

^ self

lookUpPropertyNamed: #TR_totalNumberOfLinesOfCode

computedAs: [ (self sumNumbers: [ :each | each TR_LoC ]) asFloat ]

How can I access for example totalNumberOfLinesOfCode at the model level?

We had the problem at Synectique and it is a complex issue
(and no, we did not find a satisfactory solution)

For LOC specifically, in Smalltalk your solution can work, but not in Java, since classes and methods can contain inner/anonymous classes and you don't want to count them twice
The problem also exist in Ada (not with classes)

Second, there is also the larger problem of aggregation of a metric at some higher abstraction level
- some times you want to sum (e.g. LOC) ;
- sometimes it seems more reasonable to average (e.g. cyclomatic complexity at the level of classes) ;
- sometimes you want to recompute (e.g. coupling between 2 classes can often not be aggregated from the results of couplings between their methods) ;
- and also averaging is not always a good solution in itself and you want something more sophisticated (http://dx.doi.org/10.1002/smr.1558)


nicolas

-- 
Nicolas Anquetil -- MCF (HDR)
Project-Team RMod

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