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 BuildGarbageCollector AttributeError: 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
folder.manage_addProducts ['Transience'].constructTransientObjectContainer might work (assuming "constructTransientObjectContainer" is the right constructor name, I didn't check). - C On Jun 20, 2006, at 9:39 AM, Jonathan wrote:
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 BuildGarbageCollector AttributeError: 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 _______________________________________________ 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 )
----- Original Message ----- From: "Chris McDonough" <chrism@plope.com>
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
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
----- Original Message ----- From: "Chris Withers" <chris@simplistix.co.uk> To: "Jonathan" <dev101@magma.ca> Cc: "Chris McDonough" <chrism@plope.com>; <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
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
----- Original Message ----- From: "Jean Jordaan" <jean@upfrontsystems.co.za> 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
participants (4)
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Chris McDonough -
Chris Withers -
Jean Jordaan -
Jonathan