Re: how to structure an object hierarchy in VB ?

[- John of Arc -]

Thank you very much.

First thing anyone's said on the subject. I appreciate the commentary.


Frode Gilberg <frode@devplace.com> wrote in message
news:38c8bb36$2@news.devx.com...
> Hi,
>
> >Where should the root object(s) be stored? As global object variables?
>
>
> Try to avoid global object variables. I usually, have one multiuse
object -
> The
> LogOn object, which in turn return's a new root object through one of it's
> methods
> (typically the LogOn method)
>
> The next "root"-object (Application object?), includes cached data
> (static/dynamic data collections) and search functions that return
> new root-objects (dynamic data).
>
> >How should one handle garbage collection, object variable destruction?
>
>
> For each new record read from the database, the dynamic data cache is
> updated
> for objects already read from DB, and new ones are added to the dynamic
> cache.
>
> Cleaning up can be a problem tho. I'm currently trying to solve this by
> traversing the
> dynamic data collection (cache) before new data is read, checking every
> object's instance
> refcount value (using the memcopy technique). If refcount=1 (only
referenced
> by the
> dynamic cache), it will be removed from the cache. I've heard that
> the refcount is unreliable, so my question is : is it just as unreliable
for
> in-proc servers
> as for out-proc servers? Comments on this approach is appreciated.
>
> >What stock objects should an application have? Application/Session?
User?
> >etc.?
>
>
> How many do you need?
>
> >How much should a sub main() or startup form do? Should it only
> instantiate
> >the main objects and then let them do their thing?
> >Or should it use them as is needed, creating and destroying them?
>
>
> Avoid using forms in AxDLL's. Sub Main usually contains no code.
>
> >Thanks for any suggestions, web sites, samples, pointers, advice, book
> >suggestions, discussion, etc. Or pointers to other threads on this list.
> >
> Wrox wrox wrox
>
> /Frode
>
>

[Frode Gilberg]

Mark,

Thanks ! Yes, it's the method he mentioned it in his book, I meant. Was
afraid it wasn't realiable. Think I should try to figure out another way to
do it. I could create my own generic "AddRef" and "Release" function,
keeping the count in an array or something. Big memory leak and bug
potensial, tho. . The object model I'm currently working on is too
complex for a traversing function to check what object references are being
used (takes too long to execute), so I'm desperatly trying to find an
effective method. Any ideas? Anyone?

/Frode

Mark Alexander Bertenshaw <Mark.Bertenshaw@virgin.net> wrote in message
news:38ca7f4d@news.devx.com...
> Frode -
>
> If you are talking about the technique suggested by Bruce McKinney, then I
> have to say that it is very unreliable. In fact, in one project I created
> it was 100% unreliable.
>
> Mark Alexander Bertenshaw
> Programmer/Analyst
> Prime Response
> Brentford
> UK
>
> > If refcount=1 (only referenced
> > by the
> > dynamic cache), it will be removed from the cache. I've heard that
> > the refcount is unreliable, so my question is : is it just as unreliable
> for
> > in-proc servers
> > as for out-proc servers? Comments on this approach is appreciated.
> >
>
>
>

[- John of Arc -]

Can you simplify and flatten the object model?

Frode Gilberg <frode@devplace.com> wrote in message
news:38cc2120@news.devx.com...
> Mark,
>
> Thanks ! Yes, it's the method he mentioned it in his book, I meant. Was
> afraid it wasn't realiable. Think I should try to figure out another way
to
> do it. I could create my own generic "AddRef" and "Release" function,
> keeping the count in an array or something. Big memory leak and bug
> potensial, tho. . The object model I'm currently working on is too
> complex for a traversing function to check what object references are
being
> used (takes too long to execute), so I'm desperatly trying to find an
> effective method. Any ideas? Anyone?
>
> /Frode
>
> Mark Alexander Bertenshaw <Mark.Bertenshaw@virgin.net> wrote in message
> news:38ca7f4d@news.devx.com...
> > Frode -
> >
> > If you are talking about the technique suggested by Bruce McKinney, then
I
> > have to say that it is very unreliable. In fact, in one project I
created
> > it was 100% unreliable.
> >
> > Mark Alexander Bertenshaw
> > Programmer/Analyst
> > Prime Response
> > Brentford
> > UK
> >
> > > If refcount=1 (only referenced
> > > by the
> > > dynamic cache), it will be removed from the cache. I've heard that
> > > the refcount is unreliable, so my question is : is it just as
unreliable
> > for
> > > in-proc servers
> > > as for out-proc servers? Comments on this approach is appreciated.
> > >
> >
> >
> >
>
>