July 2004 - Zope-Dev

How to add sections to zope.conf?
by Chris Withers 16 Jul '04

16 Jul '04

Hi all, Say I have a process which needs some configuration but which is based on zope. How do I add arbitary sections into zope.conf at the top level and then how do I get hold of the configuration? What I'd like to do (and tried!) is to write a component.xml, put it in my package and then add a section to the top-level of my zope.conf something like: %import mypackage <mypackage_config> somekey somevalue </mypackage_config> ...and then get hold of it with: from App.config import getConfiguration config = getConfiguration().mypackage_config ...but this doesn't seem to work. Am I doing something wrong or do their need to be changes to zopeschema.xml to allow this? cheers, Chris -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk

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zope 2.7.1 on xp profesional
by Chris Johnson 16 Jul '04

16 Jul '04

I get this error on running runzope installed on xp profesional ibm thinkpad. Any idea what is happening ? cj C:\Zope-Instance\bin>runzope.bat>c:\zopeError.txt C:\Program Files\Zope-2.7.1\bin\lib\fcntl.py:7: DeprecationWarning: the FCNTL mo dule is deprecated; please use fcntl DeprecationWarning) ------ 2004-07-16T21:50:47 INFO(0) ZServer HTTP server started at Fri Jul 16 21:50:47 2 004 Hostname: IBM-CD24ABFA02F Port: 8080 ------ 2004-07-16T21:50:47 INFO(0) ZServer FTP server started at Fri Jul 16 21:50:47 20 04 Hostname: IBM-CD24ABFA02F Port: 8021 Traceback (most recent call last): File "C:\Program Files\Zope-2.7.1\lib\python\Zope\Startup\run.py", line 50, in ? run() File "C:\Program Files\Zope-2.7.1\lib\python\Zope\Startup\run.py", line 19, in run start_zope(opts.configroot) File "C:\Program Files\Zope-2.7.1\lib\python\Zope\Startup\__init__.py", line 4 9, in start_zope starter.makeLockFile() File "C:\Program Files\Zope-2.7.1\lib\python\Zope\Startup\__init__.py", line 2 51, in makeLockFile lock_file(self.lockfile) File "C:\Program Files\Zope-2.7.1\lib\python\Zope\Startup\misc\lock_file.py", line 40, in lock_file fcntl.flock(file, fcntl.LOCK_EX | fcntl.LOCK_NB) AttributeError: 'module' object has no attribute 'flock' C:\Zope-Instance\bin>

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zope 2.7.1 on xp profesional
by Chris Johnson 16 Jul '04

16 Jul '04

<<zopeError.txt>> I get this error on running runzope installed on xp profesional ibm thinkpad. Any idea what is happening ? cj

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Granularity of Persistent Objects
by Ian Beatty 16 Jul '04

16 Jul '04

Greetings. I'm developing a Zope (2.7) product, and I've got a particular persistent object that's going to be a real bottleneck, in that there will be many threads trying to change the state of the object more or less simultaneously. I'd like to "spread out" the problem by taking member fields of the object (lists, dictionaries, etc.) and making them persistent sub-objects in their own right. That way, changes made to one of them can be saved to the ZODB without causing thread conflicts with changes being made to others, removing at least some of the thred conflicts. However, I don't know how to do this. Is it as simple as using a PersistentMapping where I'd normally use a standard Python dictionary? Or shall I wrap each one in a custom class that subclasses Persistent? Does my parent object have to handle these in any special way so that the ZODB knows to give them their own DB records? I've tried looking at how ObjectManager does things, and found it less than enlightening. Thanks, ..Ian Beatty University of Massachusetts Amherst

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mount a plonesite with zeo storage
by Martino Salvato 16 Jul '04

16 Jul '04

hi, I'm just try to use Zope 2.7 and Plone with zeo storage support. and I would like to put a CMFPlone site into a zeo client storage to mount in a zope instance. I have added in my zeo.conf <filestorage plonesite> path $INSTANCE/var/plonesite.fs </filestorage> and in zope.conf <zodb_db plonesite> mount-point /plonesite container-class Products.CMFPlone.Portal.PlonSite <zeoclient> server localhost:9999 storage plonesite name plonesite cache-size 200000000 client cache var $INSTANCE/var </zeoclient> </zodb_db> I start the zeo with runzeo and the zeo client storage plonesite.fs is created... I start zope, but when i try to add a ZODB Mount Point, I get a Zope Folder instead of a Plone Site, why the container-class rule doesn't work? Or there is another way to add a new plonesite as zeo client storage? Thanks, in advance... Martino

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Re: [ZODB-Dev] Getting rid of ZODB versions (was Re: [ZWeb] Are Versions evil?)
by Christian Robottom Reis 15 Jul '04

15 Jul '04

On Thu, Jul 15, 2004 at 05:18:37PM -0400, Jim Fulton wrote: > I don't think anyone find versions useful in cases where > locks matter. With versions, if you get resource contention, > someone loses. > > Long-running subtransactions as I'm proposing would rely on mult-version > concurrency control, rather than locks. In either case, if you have > resource contention, you are probably out of luck. Locks are important, however, in cases such as generating unique IDs based on integer attribtues in a database. This is something we never managed to sort out in IndexedCatalog, and I wonder if anyone else ever has. Take care, -- Christian Robottom Reis | http://async.com.br/~kiko/ | [+55 16] 3361 2331

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Re: [ZODB-Dev] Getting rid of ZODB versions (was Re: [ZWeb] Are Versions evil?)
by Dieter Maurer 15 Jul '04

15 Jul '04

Jim Fulton wrote at 2004-7-15 10:00 -0400: > ... >Given this, I'd like to formally announce the intention to deprecate >versions in both Zope and ZODB. We will formally deprecate versions when >we have a way to maintain long-running transactions in Zope. I have a good >idea how they would work and I'd be happy to advise volunteers on how to >proceed. Any volunteers? Any objections? Versions are nothing else than long running transactions (which the additional but not essential feature to be able to join such a transaction). Locking might be necessary for long running transactions as the longer the transaction the higher becomes the risk of conflicts and the more costly a redo of the transaction. When we get long running transactions I will be happy to let Versions alone. -- Dieter

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TAL Hotfix 2004-07-14 for Zope 2.7.0, 2.7.1
by Fred Drake 14 Jul '04

14 Jul '04

This hotfix product fixes a security bug in Page Templates. This fix ensures that values substituted in named slots in translated elements are properly encoded. If encoding is not desired and the source of the replacement text is trusted, the "structure" modifier can be used with the tal:content or tal:replace attribute to explicitly disable encoding. Affected Versions This fix applies to Zope 2.7.0 and 2.7.1. Zope versions 2.7.2 and newer already contain this fix, and do not require this hotfix. This fix also obsoletes 'Hotfix_20040713', so that should be uninstalled when this hotfix is installed. See the README.txt file provided with 'Hotfix_20040713' for instructions on removing that hotfix. Getting the Hotfix You can download the hotfix at: http://zope.org/Products/Zope/Hotfix_2004-07-14/Zope%202.7.0%20-%202.7.1/ The product contains a README.txt file with installation instructions. -Fred -- Fred L. Drake, Jr. <fred at zope.com> Zope Corporation

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Re: [Zope-dev] any limits on object number?
by Nagarjuna G. 14 Jul '04

14 Jul '04

On Wed, 2004-07-14 at 14:20, Andreas Jung wrote: > --On Mittwoch, 14. Juli 2004 13:46 Uhr +0530 "Nagarjuna G." > <nagarjun(a)gnowledge.org> wrote: > > > We are builiding a large portal using Zope. We need to create a large > > number of objects. > > How large? in one case, we want the metadata of all the wikipedia contents, that will be around 300,000 objects. > The data component of the objects is small, but each > > object carries lots of metadata. My question is: Is there any limit on > > the number of objects in a given folder? > > No, but you should use BTreeFolder2 in any case and don't use the standard > Zope folder! thanks, this is certainly going to help, I will try inheriting this class. > > > I am not planning to use any > > external RDBMS. Are there any known performace isssues when the numbeer > > of objects increase, particularly when we store them in the same folder? > > > > > > Maybe tell us some details..... The project is GNOWSYS, an application that builds semantic web portals on top of Zope. When we tried to upload objects from wikipedia's sqldump of after about 40,000 objects in a folder the script went for a toss. roughly each time we ran the script the same problem. even to visit the folder of even 1000 objects through ZMI is a pain. I think that is where BTreeFolder2 will be very useful. I am also thinking to use a squid cache style of storing objects in zodb, where the objects go into many subfolders (i dont know what is this method called technically) with several sub folders with names alphabetized/numbered. this way i can store large number within zodb though not in the same folder/BTreefolder2. Should I use both methods? Not related to Zope, but what about filesystems? there must be a limit on the number of files within one folder depending on which filesystem one uses. Thanks Nagarjuna

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StringIO and Zope
by Tor Oskar Wilhelmsen 13 Jul '04

13 Jul '04

Hi I have a problem with python 2.3.3 and Zope 2.7.0. When I Execute the code below, Python just get som unhandled exceptions, and crash? Why? Does anyone know??? from cStringIO import StringIO #pic[3] is a blob in a database data = pic[3] fil = StringIO(str(data)) #this line makes Zope and Python crash!!!! -Tor Oskar Wilhelmsen

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