[aosd-discuss] How to define Scattering?

Thu Feb 14 20:04:25 EST 2008

Dear Dipankar,

In the following direction
http://quercusseg.unex.es/chemacm/research/TR3_07.pdf you may find a
technical report with some formal definitions of scattering, tangling and
crosscutting. Moreover, in this technical report, we have formally
compared these definitions with others existing in the literature.

We have also defined a set of metrics in order to assess the degree of
crosscutting in a system. These metrics have been compared with other
similar ones (the mentioned here by Eduardo and Marc).

Best regards.

José María Conejero.

Quercus Software Engineering Group.
University of Extremadura. Spain
http://quercusseg.unex.es
E-mail: chemacm at unex.es

> -----Mensaje original-----
> De: discuss-bounces at aosd.net [mailto:discuss-bounces at aosd.net] En
> nombre de Eduardo Figueiredo
> Enviado el: martes, 12 de febrero de 2008 0:08
> Para: Dipankar Majumdar; discuss at aosd.net
> Asunto: Re: [aosd-discuss] How to define Scattering?
>
> Hi Dipankar,
>
> Following up on Marc's trail, you might be interested in a survey of
> metrics for quantifying concern scattering/tanling we have recently
> concluded. We have defined a set of criteria for analysing scattering
> in addition to the concern granularity and program elements under
> consideration.
>
> E. Figueiredo,  C. Sant'Anna, A. Garcia, T. Bartolomei, W. Cazzola,
> and A. Marchetto. "On the Maintainability of Aspect-Oriented Software:
> A Concern-Oriented Measurement Framework". Proc. 12nd European Conf.
> Software Maintenance and Reengineering (CSMR), Athens, Greece, April
> 2008.
>
> http://www.lancs.ac.uk/postgrad/figueire/publications/csmr08ready.pdf
>
> Cheers,
> Eduardo.
>
>
> On 11/02/2008, Marc Eaddy <me133 at columbia.edu> wrote:
> > Hi Dipankar,
> >
> >         Great question!  "Scattering" means that a concern is
> implemented by
> > more than one program element.  However, this all depends on how you
> define
> > "concern," "implemented," and "program element."  If you define a
> program
> > element as the entire program A, no concerns are scattered.  If you
> define a
> > program element as the individual tokens of program A, most concerns
> are
> > scattered.  A concern may be scattered in program A and not in
> program B.
> >
> >         Scattering also depends on the granularity of the concern.
> For
> > example, a feature concern such as "Draw shapes" is at a higher level
> of
> > granularity than "Draw circles."  In general, scattering is
> proportional to
> > concern granularity level and inversely proportional to program
> element
> > granularity level.
> >
> >         Probably most troublesome is that "implements" is not an easy
> > relationship to decide.  What does it mean to say a piece of code
> implements
> > a concern?  Does the Main function implement every concern? (If so,
> every
> > concern is scattered.)  Determining the relationship between concerns
> and
> > code is called the concept assignment problem.  It is undecidable in
> > general.
> >
> >         Several researchers have created metrics to measure
> scattering:
> >
> > F. C. Filho, N. Cacho, E. Figueiredo, R. Maranhao, A. Garcia, and C.
> M. F.
> > Rubira, "Exceptions and Aspects: The Devil is in the Details,"
> Foundations
> > of Software Engineering (FSE), 2006.
> >
> > M. Eaddy, T. Zimmermann, K.D. Sherwood, V. Garg, G.C. Murphy, N.
> Nagappan,
> > and A. Aho, "Do Crosscutting Concerns Cause Defects?," in submission,
> > September 2007.
> >
> http://www.cs.columbia.edu/~eaddy/publications/DoCrosscuttingConcernsCa
> useDe
> > fects-JournalSubmission.pdf
> >
> > Cheers,
> >
> > Marc Eaddy
> > PhD Student
> > Columbia University
> > http://www.columbia.edu/~me133
> >
> > > -----Original Message-----
> > > From: Dipankar Majumdar [mailto:mdipankar at aim.com]
> > > Sent: Sunday, February 10, 2008 11:15 PM
> > > To: discuss at aosd.net
> > > Subject: [aosd-discuss] How to define Scattering?
> > >
> > > Hi All,
> > > I am working on Aspect Mining at Jadavpur University, India. It is
> well
> > > known that 'Scattering'  is one of the principal characteristics of
> any
> > > Aspect. Can you please let me know, what is the formal definition
> of
> > > Scattering? Or in other words what are the symptoms that we look
> for,
> > > in order to tell whether a particular 'block of code' is scattered?
> > >
> > > Regards
> > >
> > >
> > > Dipankar Majumdar
> > > Dept. of Information Tech.
> > > B.P. Poddar Instt of Mgmt & Tech.
> > > Kolkata - 700052
> > > India
> > > ________________________________
> > >
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> >
> >
> >
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>
>
> --
> Eduardo Figueiredo
> PhD Student in Computing
> Lancaster University
> http://www.lancs.ac.uk/postgrad/figueire/
>
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