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| | | Subject: What is the expert pattern? | Subject: What is the expert pattern? 2004-04-29 - By Ram Kishore
Back
It comes under GRASP(General Responsibility Assignment Software Patterns)
pattern of Larman.
Information Expert (or Expert) pattern.
Solution : Assign a responsibility to the information expert.
Problem : What is the general principle of assigning responsibilities to
objects.
v The information expert is the class that has the necessary information
to fulfill the responsibility. The information expert pattern is about
assigning responsibilities to this class.
v The first step to apply this pattern is identify the information expert
(s) classes.
v If there are relevant classes in the Design Model, this is the place
where we should look first. Else we should look in the Domain Model and
attempt to use (or expand) its representations to inspire the creation of
corresponding design classes.
v The fulfillment of a responsibility often requires information that is
spread across different classes of objects.
v This implies that there are many partial information experts who will
collaborate in the task.
v With the information expert the information encapsulation is maintained
since objects use their own information to fulfill the tasks. This usually
supports low coupling.
v Behavior is distributed across the classes that have the required
information, thus encouraging more cohesive "lightweight" class definitions
that are easier to understand and maintain.
v Related patterns are low coupling and high cohesion.
v The Information Expert should be an early pattern considered in every
design unless the design implies a controller or creation problem.
Rgds,
Ram.
-- --Original Message-- --
From: An interest list for Sun Java Center J2EE Pattern Catalog [mailto
:J2EEPATTERNS-INTEREST@(protected)] On Behalf Of Mylene Reiners
Sent: Thursday, April 29, 2004 11:13 AM
To: J2EEPATTERNS-INTEREST@(protected)
Subject: Re: What is the expert pattern?
Found some links on Google...
See e.g.
http://translate.google.com/translate?hl=en&sl=it&u=http://www.ugolandini.ne
t/ExpertPattern.html&prev=/search%3Fq%3Dexpert%2Bpattern%26hl%3Den%26lr%3D%2
6ie%3DUTF-8 (See http://UTF-8.ora-code.com)%26oe%3DUTF-8 (See http://UTF-8.ora-code.com)
(translated from Italian)
Mylene
> -- --Original Message-- --
> From: An interest list for Sun Java Center J2EE Pattern Catalog
> [mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of BURKE.Tio
> Menendez, Daniel
> Sent: 29 April 2004 07:21
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Re: What is the expert pattern?
>
>
> I'm not really sure but I think this could be just another
> name for the
> Blackboard Pattern.
>
> Hope this helps.
>
> > -- --Mensaje original-- --
> > De: Teresa Canales [mailto:Teresa@(protected)]
> > Enviado el: mi?rcoles, 28 de abril de 2004 19:41
> > Para: J2EEPATTERNS-INTEREST@(protected)
> > Asunto: What is the expert pattern?
> >
> >
> > I have heard there is a pattern called the expert pattern. I
> > haven't found
> > any website that talks about it. It is not part of the J2EE Core
> > patterns. Does anyone know what this pattern is?
> >
> > Thanks for you help!
> >
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