March 1999 - Zope - Zope lists

RE: [Zope] Zope not multi-threaded - is this a problem?
by Michel Pelletier 08 Mar '99

08 Mar '99

> -----Original Message----- > From: Tony McDonald [mailto:tony.mcdonald@ncl.ac.uk] > Sent: Sunday, March 07, 1999 3:25 PM > To: zope(a)zope.org > Subject: [Zope] Zope not multi-threaded - is this a problem? > > > Hi, > I've read on the zope-dev list that Zope is not multi-threaded. > > Does this have any ominous implications for server > performance? I believe it > means problems for people writing products, but does it give > problems for > folk using Zope in an 'install products and use them' scenario? > We can discuss this now, but in a short while it won't really matter. Zope as we know it now is not 'multi-threaded'. The real issue concerning Zope is one of concurrency, since the 'threading' of requests is ussualy created by the web server (Apache using multi-processes or Medusa (ZServer's) use of select(), neither of which use actual 'threads'). There are two areas that we are working on to make zope concurrent. The Database: There is a new version of BoboPOS, called BoboPOS3. It is currently alpha. BoboPOS3 supports concurrent processes opening, reading and writing the Object Database. 'Concurrifying' Zope: Concurrent programs have to be careful about some issues. In particular, the use of global data. These can sneak in on you in wierd ways. For example, in the regex python module (yes, regex has been depreciated for re, but for now regex is faster) certain uses of compiled reg expressions don't work when two 'threads' enter the same expression. Also, there is an issue about passing mutable objects as default arguments to methods. To be truely thread safe, default arguements need to be immutable, or mutable arguments can only be used in immutable ways. These are, as you said, developer issues. Product developers have to be careful not to block Zope for long periods of time. People in the 'install and use them' scenario should not use these types of Products unless they are sure the block times are low, and product developers should be very, very careful about moving their software out into the world if the product blocks. It should be made clear to the user that this software could stop up the whole works. Why is won't matter soon is because we are working on making Zope fully concurrent. -Michel > many thanks for any thoughts, > tone. > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev ) >

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Why doesn't this loop over files?
by Tony McDonald 08 Mar '99

08 Mar '99

Hi, I've d/led the ZopeDemos folder, installed it and started learning more about Zope, but there's something happening that I'm not sure about. The 'looping' example doesn't seem to iterate correctly over new additions to the folder. The DTML is here:   <H3>Objects of type </H3> <TABLE BORDER=1> <TH>Id</TH><TH>Title</TH>   <TR><TD></TD> <TD></TD></TR>   </TABLE>   If I create a new DTML method or document in the folder 'subFolder', it isn't recognised. I've even copy/pasted the documents that do work into the subFolder with no joy. Curiously, new folders *are* recognised. My Question is: What's preventing Zope from reading *all* the Documents in the subFolder? This would be the core of my first real application in Zope (a resource upload/download facility for staff here) so any advice would be appreciated. thanks tone. ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2

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top level acl_users Folder
by Service Informatique CHSR 08 Mar '99

08 Mar '99

Hello, Is it possible to change (I mean: to delete) the top level UserFolder and use something else, say, a UserDb folder? Also, I made a french version of Confera. If someone is insterested, drop me a note. Regards, Jephte CLAIN

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Q for the group
by Dave G 08 Mar '99

08 Mar '99

Advice needed, opinions wanted. I have a situation where there is a group of users with both a private space and a public space. The users homepage is considered private with the public space where all anonymous viewable docs are held. I have two thoughts on how to do this, Zope is capable of either method, I'm curious which method everyone else thinks best, and why. First method; community folder (contents public viewable by permission) user_folder (contents not public viewable by permission) users manage page (not public viewable by aquisition) users public folder (public viewable by permission) public_html (public viewable by aquisition) public2_html (public viewable by aquisition) users private folder (not public viewable by aquisition) Second method; community folder (contents public viewable by permission) user_folder (contents public viewable by aquisition) users manage page (not public viewable by permission) users public folder (public viewable by aquisition) public_html (public viewable by aquisition) public2_html (public viewable by aquisition) users private folder (not public viewable by permission) Both have advantages and disadvantages, either way I end up with on - off, off - on, in the permissions hirearchy. Anyone have a good argument for either method? DAve. "On the Plains of Hesitation bleach the bones of countless millions who, at the Dawn of Victory, sat down to wait, and waiting -- died"

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Zope not multi-threaded - is this a problem?
by Tony McDonald 07 Mar '99

07 Mar '99

Hi, I've read on the zope-dev list that Zope is not multi-threaded. Does this have any ominous implications for server performance? I believe it means problems for people writing products, but does it give problems for folk using Zope in an 'install products and use them' scenario? many thanks for any thoughts, tone.

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RE: [Zope] Creating Zope a zope application
by Paul Everitt 07 Mar '99

07 Mar '99

Sture wrote: > The doc says 'Creating a Zope application is simply a matter > of creating a > regular Python module containing the objects to be published, > and placing > this module along with some Zope-provided support files in > the appropriate > place on a web server' > > The doc continues to say that the zope documentation covers > this prosess, > but I'm not able to find it. So my question is - what are those > zope-provided support files, and where am I supposed to place > those file > along with the python module that I've created? Docs are still pretty light, but take a look at the Product Tutorial at: http://www.zope.org/Documentation/Reference/API --Paul

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RE: [Zope] Washington, DC area Zope users?
by Michel Pelletier 07 Mar '99

07 Mar '99

> -----Original Message----- > From: Edward C. Jones [mailto:edcjones@erols.com] > Sent: Saturday, March 06, 1999 6:05 AM > To: zope(a)zope.org > Subject: [Zope] Washington, DC area Zope users? > > > Are there any Zope users in the Washington, DC area? > > Digital Creations (the mecca of Zope users) is in Fredricksburg, VA. About 50 miles south of DC. -Michel > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope >

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RE: [Zope] [DTML] creating variables
by Paul Everitt 07 Mar '99

07 Mar '99

Tres wrote: > I too miss Python when working in DTML. But in this case, I I also wish Python could get into DTML. I look at some of the DTML that gets written and think "Ugh, that's pretty awful." Still, I don't yet see an alternative. --Paul

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Creating Zope a zope application
by raver＠box.dust.za.net 07 Mar '99

07 Mar '99

Hi! I'm reading 'A technical introduction to object publishing with Zope'. The doc says 'Creating a Zope application is simply a matter of creating a regular Python module containing the objects to be published, and placing this module along with some Zope-provided support files in the appropriate place on a web server' The doc continues to say that the zope documentation covers this prosess, but I'm not able to find it. So my question is - what are those zope-provided support files, and where am I supposed to place those file along with the python module that I've created? Sture Lygren

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Subfolder Access?
by Jay Ashton 06 Mar '99

06 Mar '99

I think there must be an easy way around a little trouble I'm having, but it's had me stumped for a few days and I can't find any mention in the list/docs. >From a dhtml method I want to access a subfolder's sql methods, which is easy enough using  . The problem is, because of the amount of methods involved and in order to keep things flexible I want to add the  to a standard_header, and the  to a standard_footer. Of course, Zope nixes this. So I was hoping there was an end-run around this dilemna - some other way to give access to subfolders. I've tried including the opening and closing WITH's in the same document surrounded by IF's with no luck, and have been wondering if there's a way to set a folder property to accomplish this... - Jay

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