January 2005 - Zope - Zope lists

adding dtml/zpt methods to product classes
by Keith Alperin 28 Jan '05

28 Jan '05

Greetings Zopistas! I have been a Zope tinkerer for a few years and have never been able to adequately solve this problem: When I create a Product class with DTML/ZPT methods, how can I make those methods members of the class rather than simply instance methods? These examples should illustrate what I mean. My first try was like this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def __init__(self,resourcePath, imageFolder): self.my_method = Globals.HTMLFile("dtml/my_method",globals()) That works fine until you want to add a new method to your class like so: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def __init__(self,resourcePath, imageFolder): self.my_method = Globals.HTMLFile("dtml/my_method",globals()) self.my_new_method = Globals.HTMLFile("dtml/my_new_method",globals()) new instances of your product will get the my_new_method, but instances that have already been created will not. My second try was like this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def my_method(self, REQUEST): """ template """ if (not hasattr(self,"my_method_member")): self.my_method_member = Globals.DTMLFile("dtml/my_method",globals()) return self.my_method_member(self,REQUEST) This allows me to add methods to the class at any time and all instances will get the method. However, for some reason, when I use this pattern, i get strange acquisition results (for example, some of my objects children's dtml methods will use the parent's namespace for lookups). Currently, I'm doing this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def my_method(self, REQUEST): """ template """ self.my_method_member = Globals.DTMLFile("dtml/my_method",globals()) return self.my_method_member(self,REQUEST) which seems ugly, and like it might have performance problems, but i haven't had any acquisition problems yet. My real question here is: What is the standard way to handle this problem of being able to add dtml/zpt methods to classes such that all instances of those classes get the new methods? Thanks in advance for any insight. Sincerely, Keith Alperin

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Is Zope in Use in the law firm sector?
by Maik Ihde 28 Jan '05

28 Jan '05

Hi there does anyone know of a succesful Zope-Project (especially together with CMF/Plone or similar CMS) in a major law firm ? Background: We use a Zope-based CMS for our Website and are also using a small Plone based Intranet App for our IT Department. At the moment there is a strong interest in implementing a solution which shall cover Intranet, collaborative Document Management, eLearning and various "Connectors" to other Systems like SAP R3 and Lotus Notes. Of course there are some hi-class ECMS Systems like Hyperwave which go into that direction. But these are expensive pieces of software, and I personally would rather like to see a Zope based solution here. I know of a few major Zope Projects in Germany, like the ones at Ver.di (largest trade union in Germany) and TU München (Technical University of Munich) which address really large Scale Installations. But are there any references about Intranet Solutions for larger law firms with like 500-1500 Users? Kind Regards Maik

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Investigating a reference leak...
by Ben Last (Zope) 28 Jan '05

28 Jan '05

Dear Zopistas I've been trying to track down what's either a memory or a reference leak in a Zope 2.7.3 (Python 2.3.4) system. The symptoms are that after several days of normal running on the agressively proxy-cached production site or a few hours on the development site under simulated load, the number of OFS.Image.Image references reaches very high levels, such as 17761. In the cache at that time are just 4345 images. There are only 1332 images on the whole site, so assuming (as I understand it) that each of the 5 Zope thread has its own cache, there should be a maximum of (1332 * threads) = 6660 Images. The site never creates new Images, it just loads existing ones. In a bid to see where these references are being created, I installed LeakFinder, but that doesn't help me because Images are persistent objects, and thus their __init__ methods are not called (LeakFinder appears to patch just the __init__ and __del__ methods for tracking). Thus I've been on a quest to find a place to stick a patch that will show me, for a persistent object, from where a reference to it is being created. I've tried __setstate__, and overridden it for OFS.Image.Image to print a traceback to stdout. Then I run the development Zope site with bin/runzope and watch. This shows me Images being created in the expected places, but not in quantities that would explain those huge refcounts. So; to questions: 1) Is there a better place than __setcache__ to identify where references to Images are being created? I don't fully understand the way in which persistent objects are actually created and populated. 2) Our site is very dependent on ExternalMethods (Zope provides the visual layout, business logic is in ExternalMethods, all from one module). In some of those methods, the code loads Images in order to look up information about them - this is because we have some particular standards for things like Image tags which the built-in tag() method can't support, so we have to build our own. Thus there's code like: img = getattr(self.Images,'image.gif') #all images live in /Images, got by acquisition from self buildTag(img.title,img.width,img.height) #use image attributes to build fuller tag del img #avoid leaving references around (this is paranoid!) Is there any reason that this is bad practise? I see __setstate__ for images being called from this code and then again shortly afterwards when the Image is served up to the browser. I'd be very grateful for any help on this! Regards to all Ben Ben Last Technical Director SleepyDog

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RE: [Zope] adding dtml/zpt methods to product classes
by Pascal Peregrina 28 Jan '05

28 Jan '05

Why don't you simply define the DTML/ZPT objects attributes outside any class method ? class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): my_method = Globals.HTMLFile("dtml/my_method",globals()) my_new_method = Globals.HTMLFile("dtml/my_new_method",globals()) ... This is what I do, and any new DTML/ZPT object I define that way gets added to any existing instance of this class type when I restart Zope (or when refresh my product). Pascal -----Message d'origine----- De : zope-bounces+pperegrina=lastminute.com(a)zope.org [mailto:zope-bounces+pperegrina=lastminute.com@zope.org]De la part de Keith Alperin Envoyé : vendredi 28 janvier 2005 04:59 À : zope(a)zope.org Objet : [Zope] adding dtml/zpt methods to product classes Greetings Zopistas! I have been a Zope tinkerer for a few years and have never been able to adequately solve this problem: When I create a Product class with DTML/ZPT methods, how can I make those methods members of the class rather than simply instance methods? These examples should illustrate what I mean. My first try was like this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def __init__(self,resourcePath, imageFolder): self.my_method = Globals.HTMLFile("dtml/my_method",globals()) That works fine until you want to add a new method to your class like so: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def __init__(self,resourcePath, imageFolder): self.my_method = Globals.HTMLFile("dtml/my_method",globals()) self.my_new_method = Globals.HTMLFile("dtml/my_new_method",globals()) new instances of your product will get the my_new_method, but instances that have already been created will not. My second try was like this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def my_method(self, REQUEST): """ template """ if (not hasattr(self,"my_method_member")): self.my_method_member = Globals.DTMLFile("dtml/my_method",globals()) return self.my_method_member(self,REQUEST) This allows me to add methods to the class at any time and all instances will get the method. However, for some reason, when I use this pattern, i get strange acquisition results (for example, some of my objects children's dtml methods will use the parent's namespace for lookups). Currently, I'm doing this: class HyperTextArea(Implicit, Globals.Persistent, RoleManager, Item): def my_method(self, REQUEST): """ template """ self.my_method_member = Globals.DTMLFile("dtml/my_method",globals()) return self.my_method_member(self,REQUEST) which seems ugly, and like it might have performance problems, but i haven't had any acquisition problems yet. My real question here is: What is the standard way to handle this problem of being able to add dtml/zpt methods to classes such that all instances of those classes get the new methods? Thanks in advance for any insight. Sincerely, Keith Alperin ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************

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Sorry - Found a forum - ignore last post
by Ian Nunn 28 Jan '05

28 Jan '05

Best Regards Ian Nunn

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Plone Forum
by Ian Nunn 28 Jan '05

28 Jan '05

Does one exist - I haven't found one. Best Regards Ian Nunn

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zopectlsocket dies
by Michael Williams 27 Jan '05

27 Jan '05

My plone site died today and I can't get it running again. I have located the following entries in my logs: In /var/log/messages: zopectl: Unlinking stale socket /var/lob/zope-2.7.2/main/var/zopectlsock; sleep 1 zopectl: . After each restart attempt: zopectl: daemon process started, pid=xxxx "14 seconds later" zopectl: daemon manager not running event.log: I'm getting ZODB conflict errors When the zopectlsock dies it leaves Z2.pid and Z2.lock but no corresponding process is running. I've checked around the web and can't find any solutions. Hopefully someone here can help? Thanks Michael -- Michael Williams Haywood County Schools Technology Director Instructional Technology http://www.haywood.k12.nc.us (828) 627-8314

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Using pychart from a Zope product
by Reuven M. Lerner 27 Jan '05

27 Jan '05

Hi, everyone. I'm developing a Zope application that needs to do simple line-charts, and PyChart looks like a good solution to my problems. I was able to install PyChart without any trouble, and I also ran the command-line tests without any problems. But when I stick an example into a Zope product and invoke it, I get nothing -- not an error message, not an output chart, not a security violation of some sort... nothing at all. I know that PyChart is being invoked, because I can force an error by invoking theme.get_options(), which throws an error due to the lack of command-line options. I see from the various Zope mailing lists that people are using PyChart, and I have a feeling that I'm missing something obvious. But if someone has an idea regarding what I should be doing in order to get PyChart to work, I would greatly appreciate it. Thanks! Reuven

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Calling a Z SQL Method
by Asad Habib 27 Jan '05

27 Jan '05

I have a Z SQL method that contains a simple SELECT statement and takes no arguments. When I call this Z SQL method from a DTML document/method I use the following: <dtml-in retrieve_names_sql></dtml-in> This works just fine. However, when I place the Z SQL method inside a Folder called selects and then use the following, I get an error: <dtml-in "selects.retrieve_names_sql"></dtml-in> The error I get is the following: KeyError: 0 On the other hand, when I use the following I do not get an error: <dtml-in "selects.retrieve_names_sql()"></dtml-in> I understand the difference between the 2 <dtml-in> statements but why isit that I have to explicitly show that retrieve_names_sql does not take any arguments in the latter case and not the former. The id of this Z SQL method/Zope object is retrieve_names_sql and it seems to me that this should be recognized within the object hierarchy. Any help/input would be greatly appreciated. Thank you. - Asad

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Is there a bug in x86_64 platform related with zope 2.7.4.
by chouchen 27 Jan '05

27 Jan '05

Hi, all, I managed to install zope2.7.4 in AMD system, but it doesn't work: config: fedora 3 python 2.3.4 zope 2.7.4 gcc gcc-3.4.2-6.fc3 for x86_64 the error message was when I do make as below: AccessControl/cAccessControl.c:2272: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2272: error: syntax error before "if" AccessControl/cAccessControl.c:2272: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2272: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2272: error: conflicting types for 'AcquisitionCAPI' /home/zhouzhen/software/cms/zope/zope27/lib/Components/ExtensionClass/src/Acquisition.h:44: error: previous definition of 'AcquisitionCAPI' was here AccessControl/cAccessControl.c:2272: error: initializer element is not constant AccessControl/cAccessControl.c:2272: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2272: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2272: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2272: error: syntax error before '}' token AccessControl/cAccessControl.c:2275: error: initializer element is not constant AccessControl/cAccessControl.c:2275: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2277: error: syntax error before string constant AccessControl/cAccessControl.c:2278: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2295: error: conflicting types for 'imPermissionRoleObj' AccessControl/cAccessControl.c:659: error: previous definition of 'imPermissionRoleObj' was here AccessControl/cAccessControl.c:2296: error: initializer element is not constant AccessControl/cAccessControl.c:2296: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2298: error: conflicting types for 'aq_validate' AccessControl/cAccessControl.c:674: error: previous definition of 'aq_validate' was here AccessControl/cAccessControl.c:2298: error: initializer element is not constant AccessControl/cAccessControl.c:2298: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2303: error: syntax error before "if" AccessControl/cAccessControl.c:2306: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2306: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2307: error: redefinition of 'module' AccessControl/cAccessControl.c:2268: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2307: warning: initialization makes integer from pointer without a cast AccessControl/cAccessControl.c:2307: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2312: error: syntax error before "if" AccessControl/cAccessControl.c:2314: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2314: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2315: error: redefinition of 'module' AccessControl/cAccessControl.c:2307: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2315: error: redefinition of 'module' AccessControl/cAccessControl.c:2307: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2315: warning: initialization makes integer from pointer without a cast AccessControl/cAccessControl.c:2315: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2320: error: syntax error before "if" AccessControl/cAccessControl.c:2322: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2322: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2323: error: redefinition of 'module' AccessControl/cAccessControl.c:2315: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2323: error: redefinition of 'module' AccessControl/cAccessControl.c:2307: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2323: warning: initialization makes integer from pointer without a cast AccessControl/cAccessControl.c:2323: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2328: error: syntax error before "if" AccessControl/cAccessControl.c:2331: warning: parameter names (without types) in function declaration AccessControl/cAccessControl.c:2331: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2332: error: redefinition of 'module' AccessControl/cAccessControl.c:2323: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2332: error: redefinition of 'module' AccessControl/cAccessControl.c:2307: error: previous definition of 'module' was here AccessControl/cAccessControl.c:2332: warning: initialization makes integer from pointer without a cast AccessControl/cAccessControl.c:2332: warning: data definition has no type or storage class AccessControl/cAccessControl.c:2333: error: syntax error before '}' token error: command 'gcc' failed with exit status 1 make: *** [build] Error 1 TIA Zhou Zhen

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