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How to create a new TAL statement?
by Garito 29 Oct '06

29 Oct '06

Hi all! As Aj and Chris advise my to forget the __getattr__ bussiness I try to solve the same question by other ways Now I have a new question: Can you point me to some help about how to create a new TAL statement? I would like to create a tal:yanged (for example) statement to control how zope give to use some properties Thanks! -- Mis Cosas http://blogs.sistes.net/Garito

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module UserFolder problem
by Benjamin Menking 26 Oct '06

26 Oct '06

I am adding users to an acl_users using userFolderAddUser. What I can't figure out is that after I add a new user, I cannot log in using the username and password used when calling userFolderAddUser. If I manually set the password in acl_users.properties for that user, everything works great. Oh, I am using CookieCrumbler. Has anyone run across this? I'm not sure if this is a CookieCrumbler problem... or what? Thank you! -- Ben Menking IT Security Consulting IT Business Solutions

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UTF-8 conversion
by Pascal Peregrina 26 Oct '06

26 Oct '06

Hi, We are running zope with ISO-8859-1 as the encoding for HTTP responses. In term of Zope objects, all the properties are lines, string, etc (not ulines, ustring, etc). Now, we have been asked to support Japanese (with UTF-8). So my question is: what should I need to change (in configuration) and do I need to migrate any ZODB data? Thanks. Pascal

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Re: [Zope] storing persisten object in python dictionaries
by Jürgen Herrmann 26 Oct '06

26 Oct '06

On Thu, October 26, 2006 15:25, Jürgen Herrmann wrote: > > On Thu, October 26, 2006 15:00, Marco Bizzarri wrote: >> On 10/26/06, Jürgen Herrmann <Juergen.Herrmann(a)xlhost.de> wrote: >>> >>> On Thu, October 26, 2006 14:53, Marco Bizzarri wrote: >>> > Storing persistent object in object outside of ZODB can incur in the problem of passing object(s) between threads, and, therefore, passing one object which is related to a connection on the ZODB to another context with a different connection. >> >>> ok, this is probably the problem here, so would haveing a cache dict for each thread help? there are only about 50-100 containers so the memory overhead would be neglible compared to the performance gained. >> >> Yes, this should probably resolve your issue. >> > ok, just reimplemented my _classContainer(className) method as follows: > > def _classContainer(self, className): > """ return the instances folder for className """ > thread = currentThread() > containerDict = getattr(thread, '_relClsContainerDict', None) if containerDict is None: > containerDict = {} > thread._relClsContainerDict = containerDict > container = containerDict.get(className, None) > if container is None: > container = self.unrestrictedTraverse(self._classContainerPath(className)) containerDict[className] = container > return container > > it seems to work fine, all tests pass, though i have a somewhat bad feeliong of setting an attribute on the thread object directly. > comments? > uhm, ran some more tests, seems this works fine for the first thread but not for the others, i get an error when loading a framed page for example (obviously the browser sends two concurrent requests). the error is as follows: ... * Module Products.Relateable.Relateable, line 96, in relatedObjectIDs * Module ZODB.Connection, line 729, in setstate ConnectionStateError: Shouldn't load state for 0x010f98 when the connection is closed the above code can obvioulsy only work if there is exactly one single connection tied to one thread and it's not closed while the thread is alive. anybody have suggestions on how to tackle this? best regards, jürgen herrmann _______________________________________________________________________ >> XLhost.de - eXperts in Linux hosting << Jürgen Herrmann Konrad Adenauer Allee 43, DE-93051 Regensburg Fon: +49 (0)700 XLHOSTDE [0700 95467833] Fax: +49 (0)721 151 463027 WEB: http://www.XLhost.de _______________________________________________________________________ >> XLhost.de - eXperts in Linux hosting << Jürgen Herrmann Konrad Adenauer Allee 43, DE-93051 Regensburg Fon: +49 (0)700 XLHOSTDE [0700 95467833] Fax: +49 (0)721 151 463027 WEB: http://www.XLhost.de

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Re: [Zope] storing persisten object in python dictionaries
by Marco Bizzarri 26 Oct '06

26 Oct '06

On 10/26/06, Jürgen Herrmann <Juergen.Herrmann(a)xlhost.de> wrote: > > On Thu, October 26, 2006 14:53, Marco Bizzarri wrote: > > Storing persistent object in object outside of ZODB can incur in the > > problem of passing object(s) between threads, and, therefore, passing > > one object which is related to a connection on the ZODB to another > > context with a different connection. > ok, this is probably the problem here, so would haveing a cache dict > for each thread help? there are only about 50-100 containers so the > memory overhead would be neglible compared to the performance gained. Yes, this should probably resolve your issue. > > > > Also, AFAIK, keep in mind _v_ attributes are not involved in > > transaction machinery of Zope. This means that if you have an error > > inside you transaction after you modified the _v_ cache, you will have > > the cache modified even tough the transaction has been aborted. > not a real problem as class instance containers are very static. I understand, we hit this problem while caching object obtained from database rows... and in case of failure cache became unreliable. I'm keeping the answer on the ML, if you don't mid. -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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storing persisten object in python dictionaries
by Jürgen Herrmann 26 Oct '06

26 Oct '06

hi! i have a writeen am framework where objects have unique ids and instances are stored in btreefolders, one per class. if i want to retrieve an instance based on id, i lookup it's class name and the get the class' container path from my metadata manager (f.ex. "/app/data/Appointments/instances"). now i traverse to this container and get the object with given id from there. the process of traversing to the class' container folder is done on each object get. a cool optimization for me would be to cache class container folders in a python dictionary (much faster than traversal), but this doesn't work. the main problem is that objects retrieved from these cached folders have broken acquisition. actually i asked a similar question some time ago and was told: "don't store persistent objects in python dicts." i changed my code back to traversal and everything works, but now i finally reached the optimization stage and profiling indeed shows a huge improvement in object lookup with class container caching enabled. so can anybody tell me why this doesn't work, or what to respect to make it working? btw. the cache dict is implemented as a volatile attribute (_v_classContainerDict) of a singleton object in the db. best regards, jürgen herrmann _______________________________________________________________________ >> XLhost.de - eXperts in Linux hosting << Jürgen Herrmann Konrad Adenauer Allee 43, DE-93051 Regensburg Fon: +49 (0)700 XLHOSTDE [0700 95467833] Fax: +49 (0)721 151 463027 WEB: http://www.XLhost.de

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Scalability
by kevin7kal 26 Oct '06

26 Oct '06

This is probably falls under the catagory of FAQ but I couldn't find a good answer through searching, so I'll ask. Are there any size limitations on file system storages? At what point can things become very slow? I'm wondering as much about the number of objects stored as well as file size for a Data.fs. And what about zeo storages. Is there on the number of zeo storages that can be connected to zope clients? As far as number of objects, I'm thinking in terms of 10,000,000 or more folderish and content objects. While I'm talking about it, are there any performance limitations on the zcatalog? Will it perform well even with this many objects? Thank you in advance, Kevin

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Running scripts after zope startup
by Josef Meile 25 Oct '06

25 Oct '06

Hi, I'm working in a configuration module for other products I'm developing. The idea is that the user first has to make an instance from this product, then define there where the other products instances will be created, what header, footer, and style sheets they will use, etc.. The configuration product has to detect which of my products are installed, then load some xml Formulator forms. I just created a registry class that to do the detection process: import Products JM_PRODUCTS = ['JMConfigurator','JMPlace','JMPerson'] class JMRegistry: def __init__(self): availableJMProducts = {} for productName in JM_PRODUCTS: productModule = getattr(Products,productName,None) if productModule is not None: availableJMProducts[productName] = productModule self._AvailableJMProducts = availableJMProducts """More methods come here ... """ JM_Registry = JMRegistry() The problem here is that if I import this in the initialize method of my configuration product, the _AvailableJMProducts dictionary is empty because at this point the other products hasn't been jet registered by zope. I just thaught about something like the StartupScripts products does: running this after zope starts. This is achieved as follows: __init__.py from my product: from Products.JMUtils import JMRegistry def initialize(context): #Some registration code comes here #... import ThreadedAsync.LoopCallback ThreadedAsync.LoopCallback.register_loop_callback( JMRegistry.createRegistry) JMRegistry.py: JM_PRODUCTS = ['JMConfigurator','JMPlace','JMPerson'] class JMRegistry: #Class definition is the same as above #... JM_Registry = None def createRegistry(args *): JM_Registry = JMRegistry() Unfortunatelly, after seeing the zope source code, I saw that the ThreadedAsync is only used by ZEO, which I'm not using. My workaround was to call this in the __setstate__ method of my configuration product as follows: from Products.JMUtils import JMRegistry class JMConfigurator(ZCatalog): #__init__ and other methods come here #... def __setstate__(self, state): ZCatalog.__setstate__(self,state) if JMRegistry.JM_REGISTRY is None: JMRegistry.JM_REGISTRY = JMRegistry.JMRegistry() #After having initialized the registry, I can call the methods to #load the Formulator forms self.LoadFormulatorForms() This works well, but I think it is not the better place to define this kind of things. Is there any better way of achieving the task? Regards Josef

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DTML Call Fails
by hpinson＠indepthl.com 24 Oct '06

24 Oct '06

A little bit of legacy DTML fun here... Zope 2.9.3 On save of a DTML Method, why would this dtml-call fail: <dtml-let standards="REQUEST.SESSION"> <dtml-call "standards.set('AR-DA-08', AR-DA-08)"> </dtml-let> With the error: "Expression (Python) Syntax error: invalid token" Whereas this works fine: <dtml-let standards="REQUEST.SESSION"> <dtml-call "standards.set('AR-DA-07', AR-DA-07)"> </dtml-let> Any insight is appreciated. -- Harlow Pinson Indepth Learning Email: hpinson(a)indepthl.com Phone: 505 994-2135 Fax: 505 994-3603

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Accessing ZPT properties from another page
by Dyyryath 24 Oct '06

24 Oct '06

I've got a page template that I'd like to display some information contained in the properties of another page. Can I do this? I'd like to do something like: <div tal:content="context/otherpage/template/propertyname"></div> Though that obviously doesn't work. :) Does anyone know if something along these lines is possible?

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