- Zope-Dev - Zope lists

Using ZODB standalone
by A.M. Kuchling 11 Sep '99

11 Sep '99

I'm experimenting with using ZODB3 to store a tree of objects, but don't understand what I'm doing. My expectation is that the amount of memory used should be bounded, because objects should be flushed from the cache when they haven't been accessed in a while. Instead, the Python process grows continually. Here's the simple test code I'm playing with: # Open a ZODB; this all seems fine. from ZODB import FileStorage, DB fs = FileStorage.FileStorage('/scratch/mydata.fs') db = DB( fs ) conn = db.open() # Here's my test class -- do I need to do more? import Persistence class myClass(Persistence.Persistent): pass # Create a single root object c = myClass() root = conn.root() root['c'] = c # Loop for a long time, creating new myClass instances and adding them # as an attribute to the last instance. (Perhaps ZODB needs to keep # the whole path from the root object in memory, and this test should # be building a bushy tree instead of a constantly deepening chain?) for i in xrange(100000): c.num = i c.subobject = myClass() c = c.subobject # Do commits every few objects. if (i % 100) == 0: print 'Committing' get_transaction().commit() Do I need to call some method to force a GC of the cache? What am I missing? Incidentally, are Jim's slides from the DCPIGgies meeting available online? I suspect their discussion of ZODB3 (and the slides showing the steps in using it) would be helpful. -- A.M. Kuchling http://starship.python.net/crew/amk/ prompt. n. (Unix) A symbol on the screen indicating which shell is attacking you. -- Stan Kelly-Bootle, _The Computer Contradictionary_

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unpiclkleable errors
by Robin Becker 11 Sep '99

11 Sep '99

After doing a large number of rather weird hacks to my setup to try and get some java going I now find that I'm getting the following error message every time I load the main manage 1999-09-11T16:30:29 ERROR(200) ZODB Couldn't unnpickle '\000\000\000\000\000\000\004z' I have no idea what I could have done to bring this upon myself. -- Robin Becker

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Zope hacking help
by Lalo Martins 11 Sep '99

11 Sep '99

One day of hacking Zope made my head dizzy :-( pdb was no help, neither grepping for everything I could think of. And so many components to check... ZServer, medusa, ZPublisher, aaagh! Can someone help me to the point where Zope decides what object to serve, based on the URL, and the point where this object is processed (eg, if it's DTML)? []s, |alo +---- -- I am Lalo of deB-org. You will be freed. Resistance is futile. http://www.webcom.com/lalo mailto:lalo@webcom.com pgp key in the web page Debian GNU/Linux -- http://www.debian.org

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Bug with External Methods/Pluggable Brains and Products
by David White 10 Sep '99

10 Sep '99

Hi, I've been playing around a bit lately with using pluggable brains for SQL methods from within a Python Product I'm working on. In the Content Managers Guide there's a section which discusses the use of External Methods and Pluggable Brains with Products and gives the following (shortened) descriptions: >For example, suppose an external method or brain is defined using the file name >foobar.util, then Zope will attempt to load the method or class files from the following >files, in this order: > 1.lib/python/Products/foobar/Extensions/util.py > 2.Extensions/foobar.util.py > 3.Extensions/util.py I tried this out within a SQL method that I created by enteing in a module name like this: 'myProduct.myModule'. I also entered the right mix-in class name which was in the module 'myModule. I already had created a Python Zope Product which resided in INSTANCE_HOME/lib/python/Products/myProduct and I also created an 'Extensions' sub-directory in this Product directory. So based on what the documentation said I thought I had set this up properly, but when I tried to edit the 'Advanced' tab of the SQL method it kept telling me that it couldn't find the module 'myProduct.myModule'. I looked in the App.Extensions.py source and (I think) tracked it down to the following bit of code (line 152): sw=path_split(path_split(SOFTWARE_HOME)[0])[0] for home in (INSTANCE_HOME, sw): #rest of loop... On my machine INSTANCE_HOME=/local/app/Zope and SOFTWARE_HOME=/local/app/Zope/lib/python So why does that first line effectively truncate the last two directories off of SOFTWARE_HOME, effectively making it equivalent to INSTANCE_HOME??? When I comment out that first line and change the second to: for home in (SOFTWARE_HOME, INSTANCE_HOME): #rest of loop things work as stated in the documentation. In any event I think I've found a bug here, either in the code above or in the documentation in the Content Managers Guide. Also I did try to see if this was in the Collector, and I did see an entry which may have been related to this, but it was still 'under review' so I could not view it to make sure. So if someone could shed some light on this bug(?) that would be great. Dave -- ---------------------------------------------------- David R. White Raytheon Electronic Systems Process Support (508) 440-2087 528 Boston Post Rd. Sudbury, MA 01776 davew(a)ed.ray.com ----------------------------------------------------

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Re: [Zope-dev] Multiple inheritance woes
by Rik Hoekstra 10 Sep '99

10 Sep '99

> Hmm.. I know this is a python question, but DejaNews nor the Python website > give me the answers I am looking for: > > I define a baseclass derived from CatalogAware and DTMLMethod: > > class Base(CatalogAware, DTMLMethod): > def index_object(self): > # check a few things I want to know about > # before indexing, maybe even not allowing > # the indexing > CatalogAware.index_object(self) > > A shot in the dark: Shouldn't this be CatalogAware().index_object(self)? At least this explicitly instanciates CatalogAware and stops raising TypeErrors. But I'm not sure this completely solves your problem Rik > Then I define a bunch of classes based on this base class: > > class A(Base): > pass > > class B(Base): > pass > > etc. > > Now, if I do the following: > > a=A() > a.index_object() > > I get a TypeError: > unbound method must be called with class instance 1st argument > > Now, I have seen all sorts of messages relating this error, but none of > them seem to relate to my problem... > > self in Vase.index_object _is_ a class instance, a step-by-step debug > proves this. The python interpreter just won't accept it =(. > > -- > Martijn Pieters, Web Developer > | Antraciet http://www.antraciet.nl > | Tel: +31-35-7502100 Fax: +31-35-7502111 > | mailto:mj@antraciet.nl http://www.antraciet.nl/~mj > | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 > ------------------------------------------ > > _______________________________________________ > Zope-Dev maillist - Zope-Dev(a)zope.org > http://www.zope.org/mailman/listinfo/zope-dev > > (To receive general Zope announcements, see: > http://www.zope.org/mailman/listinfo/zope-announce > > For non-developer, user-level issues, > zope(a)zope.org, http://www.zope.org/mailman/listinfo/zope )

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Zope 2 import
by Anderson Ami 10 Sep '99

10 Sep '99

dear friends I have a problem and I need your help. I installed the Zope 2 and I have an aplication in my old Zope (1.10.3) with the ZODBC 3. I try import the folder that I exported of old Zope, but I can't, why ? thanks anderson ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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DTML Document ZClass storing id as <string>
by Jason Spisak 09 Sep '99

09 Sep '99

This is a second post on this one. I have a ZClass based on DTML Document that is doing something weird. After I create an instance, I can see it in the management interface and it has the 'id' that I gave it. However, I can't bring it's id up using , or the tree tag, or . I get back <string>. I can create these objects from python just fine. Here is the DTML used to create them:          The id 'html_resume' comes up in the management interface, but I can't get a link to it otherwise, or it's id back. Any ideas? -- Jason Spisak webmaster(a)mtear.com

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Intersection (set) in Zope
by Jason Spisak 09 Sep '99

09 Sep '99

Does anyone know if Zope already has (I'll bet it does, it's just a matter of finding it, which I haven't yet) an object or method for intersection or set of two lists. I want items common to both lists. It's a simple python external method, but why write code t hat's already written. I combed the dtml guide and the source in places and can't see what it would be called. Any ideas? Jason Spisak webmaster(a)mtear.com

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ZClass based on DTML Document not getting 'id'
by Jason Spisak 09 Sep '99

09 Sep '99

Gang, I have a ZClass based on DTMLMethod and when I instanciate it, the id shows up in the management interface, but if I do  inside it, I get <string>. Help? Jason Spisak webmaster(a)mtear.com

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RE: [Zope] Re: [Zope-dev] Re: [Zope] Import from Zope-1 to Zope-2
by Michel Pelletier 09 Sep '99

09 Sep '99

> -----Original Message----- > From: Michael Bernstein [mailto:mbernstein@profitscape.net] > Sent: Thursday, September 09, 1999 12:42 PM > To: Michel Pelletier > Cc: zope-dev(a)zope.org; zope(a)zope.org > Subject: [Zope] Re: [Zope-dev] Re: [Zope] Import from Zope-1 to Zope-2 > > > Michel Pelletier wrote: > > > <dtml-with "_.Client.Object('http://A/YourDocument')"> > > <dtml-var id> > > </dtml-with> > > > > and print 'YourDocument'. You can pass autentication > information in to > > all of the calls to access restricted object. > > Excelent! Content and sevice syndication among Zope sites > without going through > RSS or XML-RPC! This will start a snowballing of Zopes > 'network effect' and > increase the value of belonging to the Zope 'network'. Woah! Further experimentation shows that it is not this simple, but close. There would have to be some pretty nifty abstraction code above Client to do what you want, Client isn't much more powerful than XML-RPC, if at all, it's just more Zopeish. > In fact, unless I misunderstand, this will allow Zope > applications to not only > expose services to other servers, but will allow truly > distributed applications... Yep. Note that the performance won't be all that (because it's HTTP). This also doesn't really solve the problem of transparent database replication. > Will there be a separate set of permissions to allow/deny > objects to be called > like this? No. 'Client' waddles, swims, and quacks just like a 'web browser' to Zope. If a method or object is protected by a certain permission, then the 'Client' call must supply a username and password that matches a user with a valid Role that can satisfy that permission. Just like a browser. If the server supplies a cookie, 'Client' will return it with the rest of the HTTP headers and you can store it seperatly (since 'Client' calls are stateless). > > Another no-no would be for an object to call Client on itself. I > > suspect this would cause some sort of StackOverflow > exception. I'm not > > sure how well Zope would take that kind of behavior. > > Hmm, what if you have Zope behind Apache running two or more > virtual domain names? > can they call each other using this method? As long as there is a 'stop' you can do this like any other recursive operation. By no-no I didn't mean you shouldn't do it, I meant you should be aware that it is recursive. -Michel

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