- Zope - Zope lists

Question about Zope dev methods vs Tomcat dev methods
by azbok＠yahoo.com 31 Oct '01

31 Oct '01

I've been experimenting with different web dev methods for about a year now. I started with plain old perl/cgi. I got annoyed (rather quickly) and went to a perl module templating system, then apache mod_perl, then perl HTML::Mason for mod_perl and now Zope/ZPT. So far I haven't seen anything as decoupled between HTML presentation and logic as Zope/ZPT. I'm debating if I should try to install Tomcat and experiment with it myself (I dunno java well which is a problem) My question is if anyone out there has used Tomcat and switched Zope (or vice versa), I would like to know why you switched? Thanks for any info

1 0

where is 'png4' which is required for installation?
by Craig Burgess 31 Oct '01

31 Oct '01

OR is this a problem with FreeBSD? I've tried about everything I can think of to get this installed on FreeBSD/i386 (although it seems to be properly installed in FreeBSD/Alpha,I gave up trying to get it to actually **work** on the Alpha after I got no reply to questions about it) thanks, craig craig(a)cheetahusa.net

1 0

Bug creating a Product ???
by Julián Muñoz Domínguez 31 Oct '01

31 Oct '01

This is very strange, like if something had corrupted my zope (linux Zope 2.4.2 binary) When I "Add Product" in /Control_Panel/Products , enters a name and push the submit button, I get this message: Zope Error Zope has encountered an error while publishing this resource. Error Type: UnpickleableError Error Value: Cannot pickle objects Troubleshooting Suggestions The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Traceback (innermost last): File /home/julian/Zope/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /home/julian/Zope/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/julian/Zope/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook (Object: LockableItem) File /home/julian/Zope/lib/python/ZPublisher/Publish.py, line 175, in publish File /home/julian/Zope/lib/python/Zope/__init__.py, line 240, in commit File /home/julian/Zope/lib/python/ZODB/Transaction.py, line 302, in commit File /home/julian/Zope/lib/python/ZODB/Connection.py, line 418, in commit (Info: (('Products.PluginIndexes.TextIndex.GlobbingLexicon', 'GlobbingLexicon'), '\x00\x00\x00\x00\x00\x00E\x13', '')) UnpickleableError: (see above) -- __o _ \<_ (_)/(_) Saludos de Julián EA4ACL -.-

2 1

Re: [Zope] NEWBIE: manage_delObject, manage_delProperties?
by Julián Muñoz Domínguez 31 Oct '01

31 Oct '01

I am using manage_delObjects method directly over the object. This is not very well documented, It's the only way I found to do it. >>>>>>>>>>>>>>>>>> Mensaje original <<<<<<<<<<<<<<<<<< El 29/10/01, 20:11:13, michael(a)exasource.com (Michael) escribió sobre el tema [Zope] NEWBIE: manage_delObject, manage_delProperties?: > I'm trying to figure out how to delete an object from Zope. I use > manage_editProperties to add and index, and manage_changeProperties > to edit and reindex, that all works fine, but I'm not sure how to delete. > I am using : > <dtml-call "propertysheets.entry_info.manage_delProperties(REQUEST)"> and > this just gives me an error message and I also tried: > <dtml-call "propertysheets.entry_info.manage_delObject(REQUEST)"> but that > errors out too. > I am using this on a database object that contains the fields: > id (this is set by ZopeTime) > first_name > last_name > email_address > mail_request > interest_area > Can anybody point out what I am doing wrong? > Michael > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev )

4 5

Fwd: Re: [Zope] zope operations atomic?
by kapil thangavelu 31 Oct '01

31 Oct '01

---------- Forwarded Message ---------- Subject: Re: [Zope] zope operations atomic? Date: Wed, 31 Oct 2001 08:35:16 -0800 From: kapil thangavelu <kthangavelu(a)earthlink.net> To: Clark OBrien <COBrien(a)isis-server.vuse.vanderbilt.edu> On Wednesday 31 October 2001 11:25 am, you wrote: > I don't want to be dense but it sounds like for each thread a deep > copy of the items it accesses- Folder for example- is made. When session > ends or something triggers a commit a check is made for conflicts. each thread maintains its own connection to the zodb, and each connection mantains its own cache. when you load up on object you are not deep loading, your loading up all of that object's data minus any persistent attributes it might have. so in a given folder stuffed with standard zope objects you only load up that folders attributes unless you explicitly access the other peristent objects. objects get stuffed into cache after access, for faster lookups. as chris mentioned zope treats every web request as a transaction. when a thread tries to commit an object it, the db checks to see if it has been updated since the transaction began, in which case you get a conflict. so what does atomic mean, that a given set of operations either succeeds as a whole or fails. the zodb passes this standard. the issue you seem to layout below is that your more comfortable with explicit locking... > This sounds a bit scarry because if you have a script changing resources > like a Folders > it is almost certain then that there will be a conflict. At this point a > retry still > find conflicts. I would rather have heard the Folder was a critical > section or methods > like manage_changeProperties were atomic. IMHOP it should be so. your joking, right... besides the fact that excessive locking kills performance and scalability, i *know* i don't want to have to litter my code with locks and thinking about concurrency. the zodb greatly mitigates concurrency issues, making them almost non-existent for most code. moving from this paradigm to some application level locking paradigm greatly complicates code and would make it damm near impossible to be productive with zope, IMO. IMO, the fact the platform itself takes care of this, and the thread local storage programming model is strength of zope. in the case above if a retry still generates an error, than it will eventually abort the entire transaction (preserving integrity). if you need high concurrency write oriented semantics i'd highly suggest you use an rdbms. and of course nothing prevents you from creating locks around your objects if you feel its nesc via a module stored lock and/or creating your own conflict resolution policy as described in the zope developer's guide. kapil > -----Original Message----- > From: kapil thangavelu [mailto:kthangavelu@earthlink.net] > Sent: Wednesday, October 31, 2001 3:03 AM > To: Clark OBrien; 'zope(a)zope.org' > Subject: Re: [Zope] zope operations atomic? > > On Wednesday 31 October 2001 07:11 am, Clark OBrien wrote: > > Hi: > > I cannot find documentation that would tell me how zope manages thread > > synchronization > > nutshell version. > > zope uses optimistic conflict resolution, no application level locking > takes > place, because all threads have their own object spaces. only on > commits, is > there some synchronization (deep within the zodb) to insure that there > weren't conflicts, if so a conflict error is raised, and the request > gets > retried. applications can define their own conflict resolution, see the > zodb > wikis and zope developer's guide for more details. > > kapil > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) -------------------------------------------------------

1 0

The Cookie Crumbler product
by Jeffrey Robinson 31 Oct '01

31 Oct '01

Hello, folks; In our recent migration of our Zope-based Intranet from a stand-alone Zope install to one use Zope+PCGI+IIS, we seem to have everything set up and working fine except for one oddity. Previously, I had used the CookieCrumbler product to authenticate users of the Intranet, which worked very nicely. Now that we've moved behind IIS, it seems that the CookieCrumbler can't give cookies to the users anymore. At first I was going to blame the new setup for "stripping off" cookies, but then realized that I can still successfully receive cookies from both the tree-navigation <dtml-tree> menu we have as well as the management interface. I then tried to follow the tact that perhaps something had happened to my CookieCrumbler during the migration, so went directly to zope via port 8080. Here, authentication worked perfectly. I'm going to assume that the CookieCrumbler delivers cookies in a different fashion than items built directly into Zope... and so, is it possible to change this behavior? Thanks; Jeff Robinson Graphic Designer Motor Coach Industries

1 0

Passing parameters from python to dtml objects..
by Shane O'Sullivan 31 Oct '01

31 Oct '01

hi all, I am currently working on a python script that is called from a dtml method. It performs some logic and then calls another dtml method. I am passing 2 parameters into the python script, "hidden_photo" and "photo_name"..my python script looks like this... if photo_name == ' ': if hidden_photo == ' ': return context.scReport(context) elif hidden_photo == 'None': return context.scReport(context) else: return context.Thumbnails.deletePhoto(context) return context.scReport(context) elif photo_name =='None': return context.scReport(context) else: return context.Thumbnails.photoAction(context) return context.scReport(context) The methods photoAction and deletePhoto need to be passed the parameters "hidden_photo" and "photo_name" - however it dosn't seem to be getting them properly- this is the error message Error Type: NameError Error Value: global name 'photo_name' is not defined Can anyone tell me how properly to pass parameters from python to dtml objects? Thanks in advance, Shane

4 4

ExtFile and fsimport?
by Jonathan 31 Oct '01

31 Oct '01

Hi all, Anybody who succeeded in adapting ExtFile and fsimport.py (or another batch import script) for importing files as new ExtFile instances? Spent a few hours trying to get it to work, but my Python knowledge apparently ain't that deep yet. Pointers? Thnx, Jonathan

1 0

Keeping a Variable's Value: This SHOULD Be Easy
by Ben Ocean 31 Oct '01

31 Oct '01

OOPS! Correction... ...but apparently it's not. If I were writing this in PHP: <html><body> Okay, boys and girls! Let's open the magic box and generate a random number! (applause)<br and drum roll> <? x = int mt_rand(0,9); echo x ?><br, strike up the band> Wow! Wasn't that exciting? Oh no! I forgot the magic number<br, shrieks of horror> <? echo x ?><br, strike up the band again> Oh, of course! How could I forget!<br, fade to black> </body></html> ...but apparently DTML *does* forget. Call that daggone variable more than once and you have to run the formula that generates a random digit! Bam! Variable's gone. Is there no way around this? Please help... BenO

6 7

ZSQL methods / input quote filtering
by Chris Beaumont 31 Oct '01

31 Oct '01

Hello! I've been working on a web form that has several large textarea fields for text input, which is working well, but once in a while people will enter single or double quotes around a word in that field. example, outer quotes are mine: "I come from a small eastern village named "New York" and while I was growing up there I learned how to play a game called 'stickball'." Sometimes that causes an error on the SQL insert or update. The text is also sometimes truncated at the quote. I thought ZSQL methods were supposed to safely escape all input content. Why is this happening? Is there a simple, accepted manner to have this behavior safely quashed besides setting up individual Python substitutions for every possible character that needs filtering? That seems as if it should be an unnecessary hack.. Thank you Chris cbeaumon(a)msri.org

1 0