[Zope-dev] Pointer or reference object

[Jason Spisak]

Johan:

When you delete an object in the ZCatalog currently it uncatalogs itself.
If you attatch the deref method to the uncatalog method, then should do
both upon deletion.  I haven't checked that pointer item, but I will right
now.

All my best,


> 
> One problem with having a reference count base class that's
> responsible for inactivate/delete the reference object is
> that Zope lacks a event model. 
> If a folder/container is deleted it doesn't inform its 
> siblings before it's deleted. And that may lead to invalid
> reference objects.
> I think ZCatalog have the same problem?
> 
> There is a pointer product in the download section, 
> have you looked at it? 
> 
> //Johan
> 
> 
> 
> 
> 
> > I meant to use resolve_url, to find any references to an object upon it's
> > deletion.  Changes in an object's state really wouldn't matter if there is
> > a way to truely 'mirror' an object.  The name spaces would have to either
> > be selectable, or since it is a mirror, then it aquires the name space of
> > the object that it is mirroring (and exact mirror).  Like I said, I don't
> > have any idea if this 'pointer' is even possible in the ZODB.  Anyone from
> > DC thinkning about this?
> > 
> > All my best,
> > 
> > Jason
> > 
> > 
> > 
> > Johan Carlsson writes:
> > 
> > > 
> > > Yes, I have thought about it.
> > > 
> > > One solution I thought of is use an object referens counter
> > > base class for "referencable objects".
> > > The base class should be responsible for manageing references
> > > and take action on the references when the objects state changes.
> > > 
> > > One problem is how to handle acqusition.
> > > Should the referenced object be viewed in it's own context or
> > > the reference objects context? Or should the contexts merge?
> > > 
> > > 
> > > How did you intend to use ZCataloges for the ZMirror?
> > > 
> > > 
> > > //Johan
> > > 
> > > 
> > > 
> > > 
> > > > Zopsters,
> > > > 
> > > > This is very out of the blue, but has anyone thought about 
> > tackling the
> > > > 'reference' question by using a phantom Zope object?  I don't know
> > > > nearly enough Python to answer this question, but maybe someone can.  
> > > > 
> > > > Is it possible to create a 'Reference' object that really 
> > stores the url
> > > > of another object and maquerades as the other object's meta_type. 
> > > > Anything that is asked of the 'Reference' object, just get's passed
> > > > along to the real object in it's place?  Obviously whenever you delete
> > > > an object any 'References' with that object's url stored in them get
> > > > deleted too(ZCatalog could hold these).  Sort of like a reflective
> > > > mirror.  You see the object in the mirror but you aren't actually
> > > > looking at the object, you are looking at the mirror.  A ZMirror.
> > > > 
> > > > All my best,
> > > > 
> > > > 
> > > > -- 
> > > > Jason Spisak
> > > > 444@hiretechs.com
> > > > 
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> > > 
> > 
> > 
> > Jason Spisak
> > CIO
> > HireTechs.com
> > 6151 West Century Boulevard
> > Suite 900
> > Los Angeles, CA 90045
> > P. 310.665.3444
> > F. 310.665.3544
> > 
> > Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email
> > address may not be added to any commercial mail list with out my
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> > 
> 


Jason Spisak
CIO
HireTechs.com
6151 West Century Boulevard
Suite 900
Los Angeles, CA 90045
P. 310.665.3444
F. 310.665.3544

Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email
address may not be added to any commercial mail list with out my
permission.  Violation of my privacy with advertising or SPAM will
result in a suit for a MINIMUM of $500 damages/incident, $1500 for
repeats.