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Reasons for the current API reference docs implementation?
by Paul Winkler 05 Apr '04

05 Apr '04

Howdy, I was thinking of writing a proposal for killing the current API reference (in lib/python/Products/OFSP/help) and replacing it with the actual docstrings of the actual classes. But before I write the proposal ... can somebody tell me what was the rationale for the way it is? -- Paul Winkler http://www.slinkp.com Look! Up in the sky! It's RASTA BAT KAZUE! (random hero from isometric.spaceninja.com)

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ZODB with twisted web.
by Syver Enstad 05 Apr '04

05 Apr '04

I am checking out how to use ZODB with twisted web. I thought that I would have the DB instance globally accesible and call the open method to get a connection on each request. I thought that if I use connection.getTransaction().commit() before sending the response I will commit on the connection for that request. Is this necesarily true when using twisted web because it is single threaded and it seems that ZODB finds the correct transaction by checking the thread. I am a bit confused here and would rather like to avoid having one request commit changes for another request.

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ZPT for CSS, anyone?
by Dylan Jay 05 Apr '04

05 Apr '04

Has anyone had a go at building a new templating language for CSS files? I can really see the need as the current prefered way of using DTML has the disadvantage that the css is no longer valid once templated. ZPT of course would be the solution if CSS was XML, but alas :( I was thinking that there must be some way of reusing TAL and/or metal to put expressions in CSS comments. My current need for this is being able to put set correct absolute urls for background images in a css file such that I can still use dreamweaver to do visual editing. Speaking of which, absolute urls are a real pain. There must be a better way of being able to edit files on a file system and have the server use absolute urls without having to write expressions for every single reference? Isn't there some equivilent to the html base tag to specify what "/" means? Dylan Jay --- http://www.meetmemap.com - makes giving directions easy http://www.pretaweb.com - Update-it-yourself, low cost websites http://www.eatmanifesto.com - against all dumbing down of food http://www.idartatravelimages.com/mySearchResults.aspx?query=Virginia%20Cho…

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Re: [Archetypes-devel] Re: Site Error
by Dieter Maurer 04 Apr '04

04 Apr '04

Dorneles Treméa wrote at 2004-4-2 14:12 -0300: > ... >Dieter fixed first part of that errors, but currently >I still have to restart Zope after change a single >comma on any product file... :-( > >Time for a second round? :-) I will be on holiday for about 2 1/2 weeks. When I come back, you can provide an example product that is not refreshable and I will try to find out why. -- Dieter

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Site Error
by AP Meyer 02 Apr '04

02 Apr '04

Hi Zopers The last few days I was fiddling around with Archetypes again and tried the multiValued slot in order to add multiple entries of a field to an instance. This does not seem to work as expected, though. Do I need a newer version of Archetypes or am I doing things wrong? Even more disturbing, however, I frequently get the following error message and am not sure what it means and whether it is related to Plone 2.0/Archetypes 1.2.5-rc2 or just Zope 2.7. Site error This site encountered an error trying to fulfill your request. The errors were: Error Type ValueError Error Value Cache values may only be in one cache. Request made at 2004/04/02 11:02:01.270 GMT+2 thanks for any hints Andre -- Dr. André P. Meyer http://home.hccnet.nl/a.meyer/ TNO FEL Command & Control and Simulation, http://www.fel.tno.nl/div2/ Delft Cooperation on Intelligent Systems, http://www.decis.nl/ -- ------------------------------------------------------------------------------ The disclaimer that applies to e-mail from TNO Physics and Electronics Laboratory can be found on: http://www.tno.nl/disclaimer/email.html ------------------------------------------------------------------------------

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Unexpected result
by Garito 01 Apr '04

01 Apr '04

Hi I try to validate a formulator object with a python script If an error was submitted the python script would acquire again the zope page template that render the formulator with the error messages My problem is than when I try to return the ZPT render Zope process the return and convert <, > and & to the < > and & I try to conver these codes, change the content-type and so on but the problem persists How can I solve these question? TIA

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Re: [ZODB-Dev] Schema migration, rename class
by Syver Enstad 01 Apr '04

01 Apr '04

Jeremy Hylton <jeremy(a)zope.com> writes: > On Wed, 2004-03-31 at 09:19, Syver Enstad wrote: > > I am looking for good resources on schema migration with ZODB. > > > > http://www-106.ibm.com/developerworks/linux/library/l-pypers.html > > > > Shows some of the techniques (the article is about Pickling) The > > article describes how to rename a class by changing the self.__class__ > > to the renamed class in __setstate__ but this doesn't seem to work. > > (I haven't followed the link yet, but ...) You can't change the class > of a persistent object, although it may seem like you can because you > can assign to __class__. I am not really interested in changing the class. I am interested in renaming it. Are there any resources on schema evolution/migration with ZODB, I have googled quite a bit but so far haven't come up with anything other than the link above which only seems to work with pickles. > The problem is that persistent references > contain the class and oid of the object. So you can change __class__, > but the next time the object is loaded it will get whatever class its > referrer thinks it has.

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Threads, Locks, Volatility, and Angst
by Ian Beatty 01 Apr '04

01 Apr '04

Greetings. I'm looking for a little wisdom -- specifically, about thread locks and Zope. I'm developing a Python-based product. One of the classes needs to hand out unique IDs to clients as they connect for the first time. I generate these by keeping an index integer in the instance that starts at zero, incrementing it by one for every new client, and using the new value for the unique ID. In order to prevent race conditions when two clients connect almost simultaneously, I have another instance variable in my class that holds a threading.lock(). I call acquire() on that lock just before the increment-and-report code, and release() just after. So far so good. That seemed to work just fine yesterday when I coded it. Then I shut down Zope overnight and started it up again today. Now, I cannot create a new instance of the class without getting the Zope error "UnpickleableError: Cannot pickle <type 'thread.lock'> objects". (I'd swear it was working yesterday, though.) I thought "Okay, no problem. I'll just make the lock variable volatile, since I don't really care whether it persists when Zope shuts down." So I renamed the lock to begin with '_v_'. That solves my "UnpickleableError" problem nicely. Unfortunately, it introduces a different problem: the code that calls acquire() on the lock now throws "AttributeError: 'NoneType' object has no attribute 'acquire'". I'm sure I initialize that variable to a threading.Lock() in the object's __init__ method. So now I'm worried that Zope is doing all kinds of pickling-unpickling activity behind the scenes, and anything I have that's volatile can disappear without warning. Are there any thread-wise Zopistas out there who can steer me right? Thanks, ..Ian -- --- -- --- -- --- -- --- -- --- -- --- -- --- -- --- -- --- -- Dr. Ian Beatty beatty(a)physics.umass.edu Physics Education Research Group voice: 413.545.9483 Department of Physics fax: 413.545.4884 Univ. of Massachusetts AIM: (available upon request) Amherst, MA 01003-4525 USA http://umperg.physics.umass.edu/ -- --- -- --- -- --- -- --- -- --- -- --- -- --- -- --- -- --- --

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RE: Zopeservice and sitecutomize
by Sakesun Roykiattisak 01 Apr '04

01 Apr '04

Glad it work for you. Recently I've found another issue with zopeservice.py. The zopeservice.InstanceService class use win32process.TerminateProcess() to terminate Zope process, which leave no room for Zope to perform normal exit process (I've found in the source-code that Zope have to do many things before exit). I'm worried if this could put ZODB at risk. I also wonder why they choose to spawn another pythonw.exe process to start Zope rather than run Zope in the zopeservice's python interpreter. By the way, my 5 Zope instances is still working perfectly so far. And so do my Subversion services, which also terminate svn.exe process with TerminateProcess() ( I'm too lazy to do anything fancier :) ) Sake. >At the beginning of the Month there was a 4 post discussion about this >topic. I recently had the same problem as Sake. > > >> os.environ['PYTHONPATH'] = SOFTWARE_HOME <---------------- inserted line > >This line was questioned to be added to zopeservice.py. > >I tried it and it made my pain go away. I'm using Windows 2003 server >for this. > >Cheers, >Christian

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ZScheduler
by Alan Milligan 01 Apr '04

01 Apr '04

Hi, Following on from work started at the Zope3 Sprint in Melbourne, I've got a release candidate for a Zope scheduler. This is available from http://www.last-bastion.net/ZScheduler, where although the documentation is a little light, I've taken efforts to write online helps, although it's all reasonably intuitive. This is an attempt at delivering a definitive solution to this issue, and I'm keen to get community feedback as to what additionally is required. Since I personally am much more familiar with Z2 than Z3, there's only a Z2 release candidate at this stage - once the prescribed functionality is agreed I will produce a Z3 port (well - if I can't find any volunteer(s) ;) ...). If anybody associated with the recently released ZopeScheduler product (or any other competing product) is listening to this list, could they please make an effort to coordinate with me about the longer-term incantation of both as it's a little pointless not having a single answer to this utility. Cheers, Alan

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