Re: [Zope] Problem with constructTransientObjectContainer - Resolved
Hi Jonathan user once, then it is discarded. In order to eliminate many writes to the zodb (disk), I have decided to put the customized images into a temporary folder (RAM). Can't you just put the images in the TOC and let them expire by themselves? -- jean ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Problem with constructTransientObjectContainer - Resolved
- Original Message - From: Jean Jordaan [EMAIL PROTECTED] To: zope@zope.org Sent: Thursday, June 22, 2006 11:32 AM Subject: Re: [Zope] Problem with constructTransientObjectContainer - Resolved Hi Jonathan user once, then it is discarded. In order to eliminate many writes to the zodb (disk), I have decided to put the customized images into a temporary folder (RAM). Can't you just put the images in the TOC and let them expire by themselves? I need to be able to allow client browsers to access the images via an html img src=... tag. I didn't know how to construct a url to get at the image objects within a TOC (can this be done?) Thanks, Jonathan ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Problem with constructTransientObjectContainer - Resolved
Jonathan wrote:
folder = self.restrictedTraverse('Coz/TempImages')
constructTransientObjectContainer(folder, 'GarbageCollector',
timeout_mins=10, limit=0,
delNotification=BASEFOLDER+'DeleteTempImage')
Be careful, I see a lot of hints in there that make me nervous. I'm of
the opinion that if you think you need to use a TOC, you're probably
doing something wrong...
Chris
--
Simplistix - Content Management, Zope Python Consulting
- http://www.simplistix.co.uk
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Re: [Zope] Problem with constructTransientObjectContainer - Resolved
- Original Message -
From: Chris Withers [EMAIL PROTECTED]
To: Jonathan [EMAIL PROTECTED]
Cc: Chris McDonough [EMAIL PROTECTED]; zope@zope.org
Sent: Wednesday, June 21, 2006 6:25 AM
Subject: Re: [Zope] Problem with constructTransientObjectContainer -
Resolved
Jonathan wrote:
folder = self.restrictedTraverse('Coz/TempImages')
constructTransientObjectContainer(folder, 'GarbageCollector',
timeout_mins=10, limit=0,
delNotification=BASEFOLDER+'DeleteTempImage')
Be careful, I see a lot of hints in there that make me nervous. I'm of the
opinion that if you think you need to use a TOC, you're probably doing
something wrong...
The use case: the zodb contains small image objects which need to have a
custom overlay (done with PIL) before being presented to the user. Each
overlay is unique. Each customized image is only shown to a single user
once, then it is discarded. In order to eliminate many writes to the zodb
(disk), I have decided to put the customized images into a temporary folder
(RAM). In order to delete the customized images I have created a TOC to act
as a 'GarbageCollector'. Whenever a customized image is written to the
temporary folder, an entry containing the image object id is placed in the
TOC. When the TOC 'times-out' an entry a script (external method) acquires
the object id from the TOC entry and deletes the customized image from the
temporary folder.
This seems to be working... so far ;-)
What 'hints' are making you nervous? Is there a 'better' way to do this?
Jonathan
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[Zope] Problem with constructTransientObjectContainer
I have an external method that is trying to create
a Transient Object Container in a 'temp_folder', as follows:
def BuildGarbageCollector(self):
folder =
self.restrictedTraverse('Coz/TempImages')
# Coz/TempImages already exists
folder.constructTransientObjectContainer(self, id='GarbageCollector',
timeout_mins=10,
limit=0,
delNotification=BASEFOLDER+'DeleteTempImage')
and I get the following error:
Traceback (innermost last): Module
ZPublisher.Publish, line 115, in publish Module ZPublisher.mapply,
line 88, in mapply Module ZPublisher.Publish, line 41, in
call_object Module OFS.DTMLMethod, line 144, in
__call__ - DTMLMethod at /Coz/WUI/tst -
URL: http://192.168.123.2:8080/Coz/WUI/tst/manage_main -
Physical Path: /Coz/WUI/tst Module DocumentTemplate.DT_String, line
476, in __call__ Module DocumentTemplate.DT_Let, line 75, in
render Module DocumentTemplate.DT_Util, line 196, in
eval - __traceback_info__: document_id Module
string, line 1, in _expression_ Module
Products.ExternalMethod.ExternalMethod, line 232, in __call__ -
__traceback_info__: (('tst',), {}, None) Module
/apps/zope/Extensions/cozumo.py, line 212, in ProcessControl Module
string, line 1, in ? Module /apps/zope/Extensions/cozumo.py,
line 219, in subtst Module /apps/zope/Extensions/cozumo.py, line 2473,
in BuildGarbageCollectorAttributeError:
constructTransientObjectContainer
If I change the external method as follows (remove the
reference to 'folder'):
constructTransientObjectContainer(self, id='GarbageCollector', timeout_mins=10,
limit=0,
delNotification=BASEFOLDER+'DeleteTempImage')
There is no error, but the TOC is created in the wrong
folder. I can manually (thru the ZMI) add a TOC to the TempImages folder,
but I can't create one programmatically.
Can anyone point me in the right direction?!
Thanks,
Jonathan
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Re: [Zope] Problem with constructTransientObjectContainer - Resolved
- Original Message -
From: Chris McDonough [EMAIL PROTECTED]
folder.manage_addProducts ['Transience'].constructTransientObjectContainer
might work (assuming constructTransientObjectContainer is the right
constructor name, I didn't check).
Chris, thanks for the idea - I tried it, but it generated the error:
BadRequest: ('Empty or invalid id specified', Folder at /Coz/WUI)
After looking at the Transience.py source I found the answer: Instead of
passing 'self' as the first parameter I passed the folder object instead.
The worked because constructTransientObjectContainer does:
self._setObject(id, ob)
So the final solution was:
folder = self.restrictedTraverse('Coz/TempImages')
constructTransientObjectContainer(folder, 'GarbageCollector',
timeout_mins=10, limit=0,
delNotification=BASEFOLDER+'DeleteTempImage')
Thanks again for the help, it got me thinking in the right direction!
Jonathan
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