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FYI: Slightly updated version of the Z ODB tech docs
by Paul Everitt 24 Mar '99

24 Mar '99

I've gotten a lot of reports about a broken link to the ephemeral, much-referenced "BoboPOS3a1" technical docs. I promised myself I wouldn't update the link unless I updated Jim's doc to Zope-ify it. Thus: 1) The official name of the database is "ZODB", the Z Object Database. 2) The News on the site has a link to the ZODB3 Technical Documentation. This is a very well written, circa October document from Jim Fulton that describes the architecture of the next version of the database (i.e. Zope2). It's quite nice -- contains UML diagrams, API discussions, etc. 3) The broken links have been updated. --Paul Paul Everitt Digital Creations paul(a)digicool.com 540.371.6909

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is win3.1 ok?
by Tim Fraser 24 Mar '99

24 Mar '99

Would Zope run on a win3.1 laptop the same as Win95? Anyone doing this? I'm currently running Zope on Win95 desktop without problems.

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The best way to pack and close PickleDictionary?
by Kevin Ehmka 24 Mar '99

24 Mar '99

Previously, using Bobo, I created several PickleDictionaries for use on my website. Regularly, I would pack these databases before ending the CGI call since they were altered very frequently. Now, using Zope, I find that I cannot pack them without receiving error messages telling me I'm attempting to write while the database is in read-only mode (it appears the Zope threads out the packing). I also found that Zope caches these databases and issues an error when I attempt to open them again. What is the best way to pack and close these databases? How can I query which db's have been opened? Even if I do keep a mapping of previously opened db's, how can I find out if Zope is closing them. Any help is appreciated. Thanks, Kevin _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com

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RE: [Zope] Counters
by Paul Everitt 24 Mar '99

24 Mar '99

Howard wrote: > I remember noticing various comments on the list bemoaning the lack of > some sort of counter. I also remember noticing the objections > which were > raised, and why counters weren't feasible. I don't remember reading > these objections, which may be why when I found a need for a > counter, I > sat down and wrote one. I now have a working Counter product which > provides a  tag . I'll indicate my appreciation of your contribution by, well, asking for more! :^) One of the big objections of the counter kind of object is that the object database gets bigger on every request. A good workaround for this would be to cache writes to the database. Thus, imagine a counter that: 1) Only wrote to the database after a threshold had passed. For instance, only every tenth state change or not until ten minutes had elapsed since the last write. 2) If the process was nicely shut down, the object would save itself. 3) Had knobs in the management screen that allowed adjusting the "buffered write" policy. The benefits: 1) The database wouldn't keep versioning into oblivion. 2) The application wouldn't be slowed by writes on every request. The drawbacks: 1) If the process exited not nicely, some state changes would be lost. --Paul

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Counter Product
by Shaw, Howard 24 Mar '99

24 Mar '99

The counter ought to place the properties in the Document if it is a Document and not a Method. If anyone can contribute code which will take 'md' and return x, where x is either the Document or the Folder containing a Method, I would appreciate it. Howard C. Shaw III Programmer/SysAdmin St. Thomas High School

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Counter
by Shaw, Howard 24 Mar '99

24 Mar '99

With regard to the IP checking mechanism. Realize that this reduces the count for machines behind a masquerading firewall and increases the count for machines on dynamic IP dialup accounts. If anyone is interested in using this counter but wants to prevent a given IP from incrementing the counter a second time under any circumstances, it should not be too hard to modify the code to store the IPs in an SQL table as (I think) Slashdot does. I have no need for this, and don't intend to code it, but the code, being Python, is, I think, clear enough to modify. Howard C. Shaw III Programmer/SysAdmin St. Thomas High School

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Counter
by Shaw, Howard 24 Mar '99

24 Mar '99

Well, I think I figured out how CalendarTag was packaged, so I packaged CounterTag the same way (I think). Its only 2.24Kb, so I am going to attach it... I hope I won't get shot. <grin>. <<CounterTag_tar>> Howard C. Shaw III Programmer/SysAdmin St. Thomas High School

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Re: [Zope] Re: fsimport and permissions - CORXN
by pj＠sam.engr.sgi.com 24 Mar '99

24 Mar '99

|> I should have said that fred must be world-executable That's just Unix-style permissions, no? Can't expect to access "/fred/barney" if you don't have execute perms on "/fred". ======================================================================= I won't rest till it's the best ... Software Production Engineer Paul Jackson (pj(a)sgi.com; pj(a)usa.net) 3x1373 http://sam.engr.sgi.com/pj

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Counters
by Shaw, Howard 24 Mar '99

24 Mar '99

I remember noticing various comments on the list bemoaning the lack of some sort of counter. I also remember noticing the objections which were raised, and why counters weren't feasible. I don't remember reading these objections, which may be why when I found a need for a counter, I sat down and wrote one. I now have a working Counter product which provides a  tag . It includes the ability to have multiple non-incrementing displays of a counter, and the optional ability to render the individual digits using a supplied template, thus allowing graphical counters of whatever sort you feel like using. The counter uses a long property in the containing folder, so you can manually set the counter to whatever you want. It also provides the optional capacity to have a short 'memory' of recent IP's, preventing the 'running up' of the counter by scripts or massive reloading (well, makes it more difficult anyhow). The template is supplied with variables which indicate the position of a given digit in the list (it is wierd, it works from back to front, since it uses modulus) including whether the particular digit is the first, etc. If someone will supply me with instructions on how to package the product, and how to upload it, I will be happy to make it available. Thanks are due to tsarna(a)endicor.com, on whose product this was based, and to Jim Fulton and Philip Aylesworth for answering my questions. Howard C. Shaw III Programmer/SysAdmin St. Thomas High School

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authentication problem
by Fredy Villa 24 Mar '99

24 Mar '99

Zopists, I have a secure site and trying to secure a part of the site so that only those with the role of system admin coulds access. One special page has the following code the uses a 'with' tag to include a parent environment:  <H2></H2> <P> <b>Available Documents:</b><p> <table border=1>   <tr> <td><a href=":///"></a></td> </tr>  </P> </table>  The parent object has the following permission settings: Roles Acquire permission settings? Anonymous Manager Sysadmin User no View yes yes no Access Cont. info yes yes no Open close DB conn yes yes no use SQL methods the rest are set to acquire .... the role sysadmin is declared in the gestalt object.. Do you what am I doing wrong? Fredy Villa FVilla(a)GestaltTechnology.com

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