Re: Strategy or A factory with Template Method

Thanks a lot Nick for the inputs.

So Strategy is good than a Template Method as per GOF prefer
Composition over inheritance and as Deligation is through Composition.

Correct me if i am wrong.

Thanks & Regards
Ramesh

Nick Malik [Microsoft] wrote:
> "thinkmind" <ramesh.mandaleeka@xxxxxxxxx> wrote in message
> news:1127822807.136760.66600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > Hi Group
> >
> > I was going through some blogs on the net. Here is one I am looking at.
> >
> > What's wrong with the following code?
> >
> > void uploadFiles(Set<File> files, boolean sftp, boolean scp, ...) {
> > if (sftp) {
> > // upload via SFTP
> > } else if (scp) {
> > // upload via SCP
> > } else {
> > // upload via FTP
> > }
> > }
> >
> > What the author of the blog says to use Strategy Design Pattern to
> > implement this.
> >
> > But my question is cannot we use a Factory Design Pattern with a
> > Template Method. Which one is more appropriate. Can any one give me
> > idea on this.
> >
> > Thanks & Regards
> > Ramesh
> >
>
> I think I hit "send" too soon on the previous message.
>
> What I was going to do was quote from an interesting site on patterns. The
> quote is:
>
> Strategy is like Template Method except in its granularity. [Coplien, C++
> Report, Mar 96, p88]
> Template Method uses inheritance to vary part of an algorithm. Strategy uses
> delegation to vary the entire algorithm. [GOF, p330]
>
> and the site is:
> http://home.earthlink.net/~huston2/dp/patterns.html
>
> Since the author of the snippet that you quoted was intending to replace the
> entire algorithm with one from a child class, that would be Strategy. If
> the author had specified the common parts of the algorithm and then intended
> to delegate specific parts, that would be Template method.
>
> Either way, the patterns are related very closely.
>
> --
> --- Nick Malik [Microsoft]
> MCSD, CFPS, Certified Scrummaster
> http://blogs.msdn.com/nickmalik
>
> Disclaimer: Opinions expressed in this forum are my own, and not
> representative of my employer.
> I do not answer questions on behalf of my employer. I'm just a
> programmer helping programmers.
> --

.

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