Posted by Nicolas Anquetil on Sep 22, 2017; 8:15am
URL: https://forum.world.st/About-model-level-metrics-tp4967901p4970861.html

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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