I have an external method that is trying to create a Transient Container in a 'temp_folder', as follows:
def BuildGarbageCollector(self):
folder = self.restrictedTraverse('Coz/TempImages') # Coz/TempImages already exists
folder.constructTContainer(self, id='GarbageCollector', timeout_mins=10, limit=0,
delNotification=BASEFLDER+'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 FS.DTMLMethod, line 144, in __call__
- <DTMLMethod at /Coz/WUI/tst>
- URL:
- 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 , 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: constructTContainer
If I change the external method as follows (remove the reference to 'folder'):
constructTContainer(self, id='GarbageCollector', timeout_mins=10, limit=0,
delNotification=BASEFLDER+'DeleteTempImage')
There is no error, but the TC is created in the wrong folder. I can manually (thru the ZMI) add a TC to the TempImages folder, but I can't create one programmatically.
Can anyone point me in the right direction?!
Thanks,
Jonathan
Zope maillist - Zope (AT) zope (DOT) org
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folder.manage_addProducts
['Transience'].constructTContainer might work (assuming
"constructTContainer" is the right constructor name, I
didn't check).
- C

Jun 20, 2006, at 9:39 AM, Jonathan wrote:

I have an external method that is trying to create a Transient
Container in a 'temp_folder', as follows:

def BuildGarbageCollector(self):
folder = self.restrictedTraverse('Coz/TempImages')
# Coz/TempImages already exists
folder.constructTContainer(self,
id='GarbageCollector', timeout_mins=10, limit=0,
delNotification=BASEFLDER+'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 FS.DTMLMethod, line 144, in __call__
- <DTMLMethod at /Coz/WUI/tst>
- URL:
- 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 , 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: constructTContainer
--
If I change the external method as follows (remove the reference to
'folder'):
constructTContainer(self,
id='GarbageCollector', timeout_mins=10, limit=0,
delNotification=BASEFLDER+'DeleteTempImage')
There is no error, but the TC is created in the wrong folder. I
can manually (thru the ZMI) add a TC to the TempImages folder, but
I can't create one programmatically.

Can anyone point me in the right direction?!

Thanks,

Jonathan

Zope maillist - Zope (AT) zope (DOT) org

** No cross posts or HTML encoding! **
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Zope maillist - Zope (AT) zope (DOT) org

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Message
From: "Chris McDonough" <chrism (AT) plope (DOT) com>
folder.manage_addProducts ['Transience'].constructTContainer
might work (assuming "constructTContainer" 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 constructTContainer does:
(id, ob)

So the final solution was:

folder = self.restrictedTraverse('Coz/TempImages')
constructTContainer(folder, 'GarbageCollector',
timeout_mins=10, limit=0,
delNotification=BASEFLDER+'DeleteTempImage')

Thanks again for the help, it got me thinking in the right direction!

Jonathan

Zope maillist - Zope (AT) zope (DOT) org

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Message
From: "Chris Withers" <chris (AT) simplistix (DOT) co.uk>
To: "Jonathan" <dev101 (AT) magma (DOT) ca>
Cc: "Chris McDonough" <chrism (AT) plope (DOT) com>; <zope (AT) zope (DOT) org>
Sent: Wednesday, June 21, 2006 6:25 AM
Subject: Re: [Zope] Problem with constructTContainer -
Resolved

Jonathan wrote:
>>
>folder = self.restrictedTraverse('Coz/TempImages')
>constructTContainer(folder, 'GarbageCollector',
>timeout_mins=10, limit=0,
>delNotification=BASEFLDER+'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 TC, 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 TC 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
TC. When the TC 'times-out' an entry a script (external method) acquires
the object id from the TC 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

Zope maillist - Zope (AT) zope (DOT) org

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Message
From: "Jean Jordaan" <jean (AT) upfrontsystems (DOT) co.za>
To: <zope (AT) zope (DOT) org>
Sent: Thursday, June 22, 2006 11:32 AM
Subject: Re: [Zope] Problem with constructTContainer -
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 TC 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
TC (can this be done?)

Thanks,

Jonathan

Zope maillist - Zope (AT) zope (DOT) org

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