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How-to Database Adapter
by Marco Catunda 05 Jul '02

05 Jul '02

Hello, Is there any documentation learning how to write an database adapter for Zope? I found the http://www.zope.org/Members/petrilli/WritingADA but I think it is too old. Is there any other more recently? -- Marco Catunda

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How should my ISP set up Zope?
by Felix Ulrich-Oltean 05 Jul '02

05 Jul '02

Hi I'm looking to "help" my ISP (aletia.com) to add Zope to its list of services. I'm not very clued up on Zope at all, so I'd apreciate some advice on how best to do it. On each server (RH 7.2) they host several dozen users - generally all www stuff happens through Apache VirtualHost entries - i.e. I have a ~/public_html directory and I can put .htaccess files in there to specify how I want my pages to work. What is the best way to install Zope? I can think of 2 possibilities: 1. Each user can have their own Zope installation (it's not that big and they can do what they like with it). Then I guess as long as they install mod_fastcgi on apache, and make Zope run FastCGI-aware, you've got a decent system. The issues I have with this are: - how would you get the Zope server started when they reboot the machines (which does happen now and again) - can Zope and Apache get along if the users don't have access to httpd.conf, but only to .htaccess files under their ~/public_html? 2. There's one big Zope installation, and the ISP sets up an account for each user who's interested, with a virtual domain and gives them the Manager role for everything under that domain. I would appreciate advice/ideas. Some issues could include: - best way of providing backups - logging issues - installing Zope products Thanks in advance, Felix.

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How do zope objects cached?
by alwyn＠smart.com.ph 05 Jul '02

05 Jul '02

Hi, Do zope load and interpret methods every time a hit occurs or does it cache the code/object somewhere? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com) Version: 6.0.371 / Virus Database: 206 - Release Date: 6/13/2002 ______________________________________ The information transmitted through this mail is intended solely for the addressee and may be legally privileged. Any disclosure, copying, dissemination or any action taken or omitted, to be taken in reliance on it, by persons or entities other than the intended recipient is prohibited. Smart Communications, Inc. http://www.smart.com.ph

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Calling ZSQL from DTML
by Joe Block 05 Jul '02

05 Jul '02

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm finally getting back to a project that got sidetracked, and I'm running into a problem. I'm working with several tables in PostgreSQL, and need to generate a unique ID so I can insert some data into several tables and connect them by keyids. Thanks to advice I got here several months back, I'm using a sequence in PostgreSQL and retrieving the value of the sequence with a ZSQL method. Here's the source of the uniqueid method: SELECT nextval('uniqid_seq') My problem is, I want to take the results of the uniqueid ZSQL method and use it to fill in a hidden value in the newjob_form dtml method, so when it calls the spawnjob ZSQL method, it can fill in the jobid correctly in the inserts. spawnjob works just fine when I test it (inserts successfully to both tables) but I can't figure out how to get at the results of uniqueid. I'm sure I'm missing something obvious, but I'm not making any progress. Thanks, jpb - -- Joe Block <jpb(a)ApesSeekingKnowledge.net> think about it. would you work for a company that couldn't tell the difference in quality of its employees' normal work product and the work product of someone on drugs without performing a test? -socks (agent01413(a)my-deja.com) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (Darwin) iD8DBQE9I4qryEXo8W2M9hsRAoixAKCZn829H2pz2we22l4vNnCWjTwxZQCdEAQz zn35gbOw6JnY+Hp2sKEDGkY= =75A7 -----END PGP SIGNATURE-----

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Maintaining Zope/ preventing Data.fs corruption
by Scott Syms 05 Jul '02

05 Jul '02

Hi, folks- I've recently lost a wiki site because of what looked like corruption in the data.fs file. So I'm wondering if there are any "grooming" tools out there that can report on the integrity of the Zope db and/or fix problems in the file before it bites the dust. How stable are the alternative storage engines for Zope, ie/ storing data in Oracle, etc? And is there an upper limit on how much data I can store in the Data.fs safely? much appreciated tks Scott Syms GTIS Atlantic PWGSC

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Re: [Zope] Rendering files with exception
by Jaroslav Lukesh 05 Jul '02

05 Jul '02

| Odesílatel: Dieter Maurer <dieter(a)handshake.de> | It seems that you would like to render "index.htm" if it exists | in the current folder and do something else, otherwise. Yes, but it is in my initial question. I am sorry, but I need to learn english more (I know low word count). | The following code is not completely safe but may be sufficient | for your purposes: | | <dtml-if "_.hasattr(aq_explicit,'index.htm')"> | <dtml-var index.htm> | <dtml-else>.... | </dtml-if> Absolutelly sufficient and works :) Why it is not completely safe? Many thanks, Jaroslav Lukesh

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photo folder question
by Lars Johannesson 05 Jul '02

05 Jul '02

Hi All, I'm a real zope newbie. Searched all over for this information, but no luck, so maybe the list can help. I'm using the photo and photo folder product. I've got it working using ImageMagick, and have verified that it will resize as requested. However, I'm not finding any documentation on how to really use it. What I need is a little sample dtml that shows the contents of the photo folder, like the method that lists all the objects in a regular folder. Thanks for any help. --Lars Johannesson

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Re: [Zope] Rendering files with exception
by Dieter Maurer 05 Jul '02

05 Jul '02

Marius Gedminas writes: > On Wed, Jul 03, 2002 at 08:05:40PM +0200, Dieter Maurer wrote: > > If you want to learn more about "aq_explicit", read > > > > <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html> > > I couldn't find any mention of aq_explicit there. A google search on > aq_explicit site:www.dieter.handshake.de found no matches either. > Grepping around the CVS version of the Zope Book also did not find any > results. > > What am I missing? Nothing. Look at section "3.2 Acquisition". You learn their about "implicit" and "explicit" acquisition wrappers. "aq_explicit" takes an implicit acquisition wrapper and returns the corresponding explicit acquisition wrapper, i.e. the one with the same "aq_self" and "aq_parent". As the result is an explicit wrapper, attribute lookups are only performed (automatically) in "aq_self" and no longer in "aq_parent". This gives you the expected result as long as "aq_self" is not itself a wrapped object. In simple case, "aq_self" is not a wrapper, in more complex cases, it can be, however. Dieter

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pbind - maximising performance on a multiprocessor Solaris box (Was: ZMySQLDA Help )
by Paul Browning 05 Jul '02

05 Jul '02

Sorry. Only just caught up with this: > Tony McDonald wrote: > (replies to list as some of this might be interesting to them) Agreed. I imagine quite alot of people missed this next bit because of the subject line. > > Loads of Zope work, upgrading servers to 2.5.1/python 2.1.3, and therein > lies a tale. You might have seen the interchanges on the list between > fearless Paul Browning, magic Matt Hamilton Overdoing the Newcastle Brown again? > and I about threading on > Solaris > > http://www.zope.org/Members/glpb/news2 > > Upshot there is that Python is not very happy on multiprocessors For those of you that didn't catch it: -------------------- On Tue, 28 May 2002, Matthew T. Kromer wrote: I do *not* recommend running Zope on multiprocessor machines without an ability to restrict Zope to execution on a single CPU. The reason for this is that the Python Global Interpreter Lock is shared inside a Zope process. However, threads in Python are backed by underlying OS threads. Thus, Zope will create multiple threads, and each thread is likely to be assigned to a different CPU by the OS scheduler. However, all CPUs but one which are dispatching any given Zope process will have to then wait and attempt to acquire the GIL; this process introduces significant latency into Python and thus into Zope. Linux has no native mechanism for processor binding. In fact, there is a CPU dispatch mask for processes, but there is no facility to set the mask that I know of. Solaris can use a system command like 'pbind' to bind a process to a particular CPU. Full post at <http://zope.nipltd.com/public/lists/zope-archive.nsf/ByKey/381AE53C5F57B42 6> -------------------- > hence > I'm using the 'pbind' (solaris) command to allocate a processor to a > particular Zope process. This has seriously made me look at Apple Xserve > boxes (you know I have a penchant for the kind of stuff they make :) and > the anguish from Bristol (PB's lair - a big solaris shop) has been heard > all the way to the northeast! > > Positive aspect of 2.5.1/2.1.3 is that our systems are much more stable, > but I have a weird problem re:sessions that even has ChrisMcD baffled! > (puffs out chest). Tone: So how do you use pbind? Can you share a script or two? Thanks, Paul -- The Library, Tyndall Avenue, Univ. of Bristol, Bristol, BS8 1TJ, UK E-mail: paul.browning(a)bristol.ac.uk URL: http://www.bris.ac.uk/

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popen2 in External method causes Aiieee!
by Milos Prudek 05 Jul '02

05 Jul '02

The following simple external method works fine in Python 2.1.3/Zope 2.5.1 locally, but does not work for files larger than 4000 bytes in the exactly same software configuration on a remote server. The remote server has a lot of free memory and disk space. def filetype(File=''): import os cmd='file -b -' w,r=os.popen2(cmd) w.write(File) w.close() return r.read().strip() This External method is called as follows from a Python Script: Ft = context.filetype(text[:20000]) The Aiieee! error message is: 2002-07-05T17:26:27 ERROR(200) zdaemon zdaemon: Fri Jul 5 10:26:27 2002: Aiieee! 24523 exited with error code: 13 ------ 2002-07-05T17:26:27 INFO(0) zdaemon zdaemon: Fri Jul 5 10:26:27 2002: Houston, we have forked ------ 2002-07-05T17:26:27 INFO(0) zdaemon zdaemon: Fri Jul 5 10:26:27 2002: Houston, we have forked ------ 2002-07-05T17:26:27 INFO(0) zdaemon zdaemon: Fri Jul 5 10:26:27 2002: Hi, I just forked off a kid: 24638 I am perfectly sure that it is the extrernal method that is causing it. When I removed the source code and put a simple "return 'GIF'" in the External method, problem disappeared. Why would it work on a local machine and not work on a remote hosting server? -- Milos Prudek

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