February 2000 - Zope-Dev

RE: [Zope-dev] tracking user usage
by Martijn Pieters 13 Feb '00

13 Feb '00

From: ethan mindlace fremen [mailto:mindlace@imeme.net] > > A long time ago in a galaxy far, far, away, a Zopista said > that I could > easily track user's space utilization. Could someone point me to the > hooks or wherever else I need to go to implement something like this? > > Specifically, I just need to track how big the stuff in a SiteAccess > folder gets. > > (of course, i have to cross-reference that with disk quotas, > but that's > another kettle of fish) > I think this is the email you are referring to: http://lists.zope.org/pipermail/zope-dev/1999-December/002537.html It contains just about all _I_ know about the accounting hooks. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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RE: [Zope-dev] Database connections
by Martijn Pieters 13 Feb '00

13 Feb '00

From: Stephan Richter [mailto:srichter@cbu.edu] > My client went live with a site today and we are having huge problems > with the DB connections. Every one out of five times the request will > time out. We are heavily using DB tables for our data storage. (We are > using PostGres.) > > My client has read that other people experienced the same issue, since > only 7 DB connections are allowed at a given time. She read > that you can > hack the python code somewhere. I am sure you guys know how > to do this. > If you could send me a set of instructions of how to fix it, > that would > be great. As the ZPostgreSQLDA is not thread safe, it uses only one DB connection for all threads. It is a so-called level 2 DA. For an explanation, see: http://www.zope.org/Members/petrilli/DARoadmap I thus doubt that your problem is related to the 7 ZODB connection limit. I you don't specify how many threads Zope should use (with z2.py), you will never run into this limit. I suggest you first try and pinpoint the problem. The following HowTos might help: http://www.zope.org/Members/mcdonc/HowTos/DEBUG-LOG http://www.zope.org/Members/klm/debuggingzope http://www.zope.org/Documentation/Misc/DEBUGGING.txt Also, have a look at /Control_Panel/manage_debug. I have a feeling it might be related to the ZPostgreSQLDA, but that is only a hunch, nothing concrete. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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tree tag interfer with other
by Sin Hang Kin 13 Feb '00

13 Feb '00

I just found out that if you grow more than one tree, if you click on one, all will expand or collesp. HA!

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RE: [Zope-dev] Expressions like <dtml-var this url> bail out cont rary to intuition -- proposed fix enclosed
by Martijn Pieters 13 Feb '00

13 Feb '00

From: Jarkko Kniivilä [mailto:jarkko.kniivila@ambientfactor.fi] > > While upgrading a Zope 2.1.0 beta installation recently to 2.1.3, I > discovered that a recent change made to 'DT_Var.py' rendered DTML > expressions like <dtml-var this url> and &dtml.url-this; > inoperative. I had > been relying on them for a default action url on my forms (in > DTML methods). > Especially the entity reference syntax is quite a nice > abbreviation for the > more explicit <dtml-var "this().absolute_url()"> which still > continues to > work. > > The enclosed fix simply acknowledges that 'this' isn't a ZODB > namespace > object but a method encapsulating python 'self' and thus > always needs to be > invoked. I'm not quite on the top of things why the previous > behavior was > changed in the first place (Jim? Anyone?). > > I'll file this to the Collector if there's no objection by > you. Copyright to > the patch is hereby transfered to Digital Creations to be used freely. Breaking access to this().abosulte_url() in the above way was probably not intentional. Yes, please put it in the Collector, as it may get lost otherwise. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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RE: [Zope-dev] Scheduler product, anyone?
by Martijn Pieters 13 Feb '00

13 Feb '00

From: Loren Stafford [mailto:lstafford@icompression.com] > 1. Starting the Dispatcher on Zope start-up. > The only place I can think to put this kind of initialization > logic is in > __init__.py of the product. > That code would have to look for any already-created instance > and (if found) > run it's Dispatcher method in a separate thread. Is there any > way to do > this? I have a feeling I'm confused on this point. I seems odd for > __init__.py to look for instances. > > 2. Does it make sense to provide for more than one instance of the > scheduler? I can't think of a reason. But then you couldn't > prevent someone > from creating as many as they want, could you? > > 3. Managing separate threads. > Will Zope's persistence and transaction mechanism provide all > the mutual > exclusion I need on the schedule queue? ...or do I need some > kind of lock? As a little follow-up: It was I who had already started a ZScheduler project, and worked out how to do the architecture, and wrote some initial code. Due to a new job here at DC, I ran out of time for the project completely. I have now however, transferred my ideas to Loren in a private email conversation, including all code I had on the subject. Code included a ZCatalog based scheduler object automatically being created in the root, and 'write-protecting' it (like the standard_html_header, _footer, and _error objects). Also, registering of Event objects was in place. I hereby have handed over my project to Loren to do with it as he sees fit. =) -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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RE: [Zope-dev] HTTP HEADER
by Martijn Pieters 13 Feb '00

13 Feb '00

From: Sin Hang Kin [mailto:iekentsin@infoez.com.mo] > > I am trying to make the following with XMLDocument: > > Extract a branch of the xml-tree and adding a xml header with > apropriate xsl > which the browser which can recogniz xml can use the xsl to render the > branch of the tree. > > I have made a method which have : > > <?xml version="1.0"?> > <dtml-var "toXML()"> > > however, Zope send > > <html><head> > <base href="http://..... > > before the method's output. > > Can I ask Zope not to send this? Yes, by setting the content-type to text/xml, or anything that is not text/html. Add the following line to your code somewhere: <dtml-call "RESPONSE.setHeader('content-type', 'text/xml')"> -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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HTTP HEADER
by Sin Hang Kin 13 Feb '00

13 Feb '00

I am trying to make the following with XMLDocument: Extract a branch of the xml-tree and adding a xml header with apropriate xsl which the browser which can recogniz xml can use the xsl to render the branch of the tree. I have made a method which have : <?xml version="1.0"?> <dtml-var "toXML()"> however, Zope send <html><head> <base href="http://..... before the method's output. Can I ask Zope not to send this? Rgs, Kent Sin

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RE: [Zope-dev] Accessing root object
by Martijn Pieters 13 Feb '00

13 Feb '00

From: Robert Sander [mailto:gurubert@gurubert.de] > > On Thu, Feb 10, 2000 at 05:57:37PM -0600, Tres Seaver wrote: > > > You should be able to do the same:: > > > > OFS.Application.Application.theORB = CORBA.orb_init( > sys.argv ) # or whatever > > Hm, that does not work. I fI do this in the __init__.py of my > product, my > entire ZOPE system is not working any more. Should the object > be pickable? > Or should that only be done when instantiating an object from > my product? The ZopeStudio method is not applied in __init__.py, but in the module itself. I import the Application module, and modify the class. Not recommended for objects, only for new class methods. See my other reply for a better method. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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Performance
by Chad Dyer 12 Feb '00

12 Feb '00

We are considering using ZOPE to manage our consumer web sites. In aggregate they currently do 500,000 page views a day. We need them to scale to 2 million page views. Their not Yahoo! but it is enough of a load that I am concerned about the performance ZOPE can provide. The feature set of ZOPE looks great and but I need to work through the performance issues. I've spent quite a bit of time looking at example ZOPE sites and none appear to be huge trafficed sites. They seem to be more vertical developer sites or business-business sites that have lots of features but not necessarily tons of users banging on them at once. Does anyone have benchmarks or performance information from either a software or hardware standpoint they can send me? Chad Dyer

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Servlets - Zope
by Dave 12 Feb '00

12 Feb '00

I'm a Zope newbie. For the past 2 years I've been writing web apps using Java Servlets that use databases heavily. With Servlets I've used Connection pools to speed up access. Could someone give me a rough idea of how Zope (say using MySql) handles heavy database integration (i.e. Does Zope create a connection pool, Is there a limit on the number of connection within Zope, etc...) ? Could you (would you need to) create a pool to cache Db connections? Also, on a side note. Has anyone looked at the need or possiblity of hooking Zope to Apache JServ to run Servlets from Zope? Thanks, Dave Bryson

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