[Zope-dev] Storing part of an object on the file system

[John D. Heintz]

Andy,

I'm just checking an assumption that I'm making about the Ext* Products:
They do no work out of the box with ZEO, right?

That is, they would require some sort of shared network drive for all 
ZEO clients to functions correctly.

Thanks,
John

Andy McKay wrote:

> Actually just follow up I realised I never told you how I solved this
> problem. I compacted all data types into File, Image or DTML Document. Since
> I had ExtFile and ExtImage I chopped those into one class called it
> ExtThing, and the wrote classes off it. ExtFile and ExtImage I cut and
> pasted (not complete) for the most part.
> 
> Then I wrote a class that called ExtHTML that is a DTML Document that
> overrides the munge() and read() read functions. Instead I passed those onto
> ExtThing. And there you go a DTML Document that has the main body stored on
> the local file system.
> 
> Thanks McGregor.
> --
>   Andy McKay.
> 
> 
> ----- Original Message -----
> From: "Andy McKay" <andym@ActiveState.com>
> To: <zope-dev@zope.org>
> Sent: Thursday, February 08, 2001 4:15 PM
> Subject: [Zope-dev] Storing part of an object on the file system
> 
> 
> 
>> Ok whack idea #34... Well sort of, the idea was sparked by ExtFile (yes
> 
> its
> 
>> all his fault honest). We want to have files on the file system for many
>> reasons which I won't go into now, just take it for granted. But we also
>> want some of the objects information to be in the standard data.fs, so we
>> can catalog it use acquisition provide a simple interface to it and so on.
>> So far you are saying thats ExtFile and you are right.
>> 
>> But we want to extend it to any object anywhere, instead of storing the
> 
> data
> 
>> attribute in the object and pickling it in the ZODB I want to be able to
>> store the data attribute on the file system. This gives us loads of
>> advantages we also thought this would be extremely useful to other people.
>> We've bounced around ideas on how to do this and here the only two so far:
>> 
>> -    we could overload the data attribute with a class that on Pickling
> 
> into
> 
>> the ZODB instead writes it on to the filesystem...
>> -    we could in the ZODB put a hack to say if pickling something with so
>> and so attribute do this instead...
>> 
>> I feel like this something I should just not be doing, but it would be
> 
> great
> 
>> if I could get it work...
>> 
>> --
>>   Andy McKay.
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Zope-Dev maillist  -  Zope-Dev@zope.org
>> http://lists.zope.org/mailman/listinfo/zope-dev
>> **  No cross posts or HTML encoding!  **
>> (Related lists -
>>  http://lists.zope.org/mailman/listinfo/zope-announce
>>  http://lists.zope.org/mailman/listinfo/zope )
>> 
> 
> 
> 
> _______________________________________________
> Zope-Dev maillist  -  Zope-Dev@zope.org
> http://lists.zope.org/mailman/listinfo/zope-dev
> **  No cross posts or HTML encoding!  **
> (Related lists - 
>  http://lists.zope.org/mailman/listinfo/zope-announce
>  http://lists.zope.org/mailman/listinfo/zope )



-- 
. . . . . . . . . . . . . . . . . . . . . . . .

John D. Heintz | Senior Engineer

1016 La Posada Dr. | Suite 240 | Austin TX 78752
T 512.633.1198 | jheintz@isogen.com

w w w . d a t a c h a n n e l . c o m