Re: OO Architecture

On Fri, Sep 23, 2005 at 11:01:44PM +0200, Jochen Wiedmann wrote:
> Tim Bunce wrote:
> 
> >Ah, you can't get away that easily! *Why* do you strongly believe it is?
> 
> Arrgh! He got me. :-)
> 
> There is a simple argument: In the last years, there were many examples 
> of users who wanted this and that feature to be in the DBI. A typical 
> response was: Create your own DBI subclass and publish it on CPAN. If 
> your ideas are good, the subclass will be used and the ideas will at 
> some time be merged into the DBI.
> 
> To me, this is an excellent example of the tmtowtdi principle. It is 
> matching Perl's philosophy.

So what CPAN modules you you, or anyone else, point to as good examples
of subclassing the DBI?

> >What examples of DBI subclassing can you show to prove your case?
> 
> DBI::ProxyServer :-) (Bad example, to be honest, because it could have 
> been written in a different manner.)

:)

> >How do Java developers get around the lack of subclassability in JDBC?
> 
> Typically they write proxy drivers, which sit on top of the actual 
> driver. Besides, there is always AOP. AFAIK, there is nothing like AOP 
> in Perl 5. Perhaps Perl 6 is different?

Yeap: Perl6 has Roles. (Though I don't claim to understand AOP.)
http://dev.perl.org/perl6/doc/design/syn/S12.html#Roles

Tim.