General talk about software patterns

["Steven E. Newton" <sen AT cookiehome.com>]

Strictly based on my experience with too much Java and programmers with 
too little experience in OO and patterns, I would make a case for 
Singleton and Factory Method.  In combination, the two can turn any 
system into an ugly procedural-oriented mess, and as Jan notes, much 
thread-related grief. The power of private constructor and public static 
methods is great, but that way lies the Dark Side. These same systems 
will show virtually no use of Observer.

In a more serious vein, Iterator seems widespread, especially with its 
explicit adoption in the Java container classes.

s

devendermarri wrote:
> Hi Jan,
>
> SingeltonPattern may not be there in top 10, bcos of the complexities it
> posses in multi-threading programming
> and also in c++. This object should be made atomic and synchronized so that
> multi-threading operations
> does not corrupt the data. Singelton makes the design easy but it also at
> increased coupling and hard to maintain issues. I see most people tempted to
> reduce the complexity of there design by using singelton. I think singelton
> will be on the top for anti-patterns.
>
> Thanks
> Regards.
>
>
> ----- Original Message ----- 
> From: "Jan Hannemann" <jan AT cs.ubc.ca>
> To: 
> <patterns-discussion AT cs.uiuc.edu>
> Sent: Wednesday, July 06, 2005 5:03 AM
> Subject: [patterns-discussion] Which patterns are more frequently used?
>
>
>
> > I'm wondering which patterns are actually used more frequently than others
> > in practice(*). In particular, I'd like to know which the top-5 (or
>
> top-10)
>
> > Gang-of-Four patterns(**) are in terms of number of pattern instances
>
> found
>
> > in practice. I do realize that this is hard to determine objectively, but
> > subjective rankings are fine, too.
> >
> > For example, I think it is pretty clear that Interpreter is less commonly
> > used in practice than, say, Observer.
> >
> > Are there by chance even research papers on this topic available? Or on
> > related topics (empirical study of patterns in the wild)?
> >
> > Opinions are welcome as well. A few years back I spoke to one of the
>
> authors
>
> > of the GoF book and he gave me this informal list of what he thought were
> > the top-9 according to his experience (most commonly used on top):
> >
> > Observer
> > Composite
> > Singleton
> > Abstract Factory
> > Visitor
> > Adapter
> > Factory Method
> > Template Method
> > Command
> >
> > Can you confirm this list, or do you have different experiences with
> > patterns used in practice?
> >
> > Thanks!
> >
> > --Jan
> >
> >
> > PS: To provide some context: my research involves design patterns (in
> > particular, the GoF patterns) and I want to make sure I focus on patterns
> > that are actually used in software development.
> >
> > (*)  With "in practice" I mean "in real-word software systems".
> > (**) I'm only interested in the GoF patterns.
> >
> > _______________________________________________
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> > http://mail.cs.uiuc.edu/mailman/listinfo/patterns-discussion
>
>
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