Design Patterns discussion

[Zhai <myzhai AT yahoo.com.cn>]

At first, I try to use Abstract Factory to design the
system. According to the intend of Abstract Factory,
it can produce a family of products. But in our
system, we do not know what the family of products is.
So we next consider to use Strategy design pattern.
we need more advice. 

--- Eduardo Franco 
<eduardo.franco AT pulso.com.br>
的正文：> I don't think the Strategy is the best
pattern for
> your problem. I don't
> even know much about the context your are developing
> the system, but
> AFAICS the best suitable pattern is the "Abstract
> Factory".
> 
> [..]
> 
> "Provide an interface for creating families of
> related or dependent
> objects without specifying their concrete classes."
> 
> [..]
> 
> This pattern let you vary families of product
> objects when the
> "Strategy" pattern let you vary an algorithm which I
> don't think is your
> real problem.
> 
> Regards,
> 
> --
> Eduardo Franco
> 
> Zhai wrote:
> > In a software system, we meet the following
> > requirements:
> >   a client program, when running, have to set or
> get a
> > parameter, named paraValue.
> > But the parameter paraValue could be stored in a
> file
> > named filePara, or in a relation
> > database, such as Oracle. Now we design an
> abstract
> > class "CParaAccess", with two
> > public virtual functions setPara() and getPara()
> to
> > set and get the parameter.
> > There are two subclasses "CFileParaAccess" and
> > "CDatabaseParaAccess" inherited
> >  from "CParaAccess", all implement setPara() and
> > getPara(). However in 
> >  "CFileParaAccess" and "CDatabaseParaAccess", the
> > principle to implement
> >  setPara() and getPara() is different. 
> >    In the design we can understand the client had
> two
> > strategies to set/get the 
> >  parameter, i.e. from a file or a database. so can
> we
> > think our design cohere 
> >  with the Strategy design pattern? If not, which
> > pattern could we use to improve
> >  the design?
> >  thx.
> 
> 
> _______________________________________________
> gang-of-4-patterns mailing list
> gang-of-4-patterns AT cs.uiuc.edu
>
http://mail.cs.uiuc.edu/mailman/listinfo/gang-of-4-patterns 

_________________________________________________________
Do You Yahoo!? 
完全免费的雅虎电邮，马上注册获赠额外60兆网络存储空间
http://cn.rd.yahoo.com/mail_cn/tag/?http://cn.mail.yahoo.com