April 2001 - Zope-Dev

RE: [Zope-dev] ZCatalog features
by Adrian Hungate 30 Apr '01

30 Apr '01

Sorry... a user came into the office as I was writing that email and completely broke my train of though :( grrrr... What I meant to say was, I think that access to the Union and Intersection operators would be a very useful feature as long as it would not involve a change to any other documented APIs etc... By user visible, I meant the AND/OR keyword processing in catalog queries on textindex fields. Would it be possible/easy to add this to other field types? Adrian... -----Original Message----- From: Chris McDonough [mailto:chrism@digicool.com] Sent: Monday, 30 April 2001 17:17 To: Adrian Hungate Cc: zope-dev(a)zope.org Subject: Re: [Zope-dev] ZCatalog features RE: [Zope-dev] ZCatalog features> I think that the idea of exposing these _in addition_ to (as opposed to instead > of) the current way it works is a good idea. What does "these" refer to here? if you mean intersection and union operations, this is the plan. > How hard would it be to add the current 'user visible' boolean logic to field > types other than text? I'm not sure what you mean... what feature are you referring to? Thanks! - C -----Original Message----- From: Chris McDonough [mailto:chrism@digicool.com] Sent: Saturday, 28 April 2001 17:10 To: Morten W. Petersen Cc: zope-dev(a)zope.org Subject: Re: [Zope-dev] ZCatalog features "Morten W. Petersen" wrote: > > Hia guys, > > A couple of comments and questions about the ZCatalog: > > Is it possible to pass an argument to the catalog so that returned brains > would instead be actual objects? Not currentl, although the new brain objects have a method 'getObject' that makes getting the object straightforward while you're iterating over a bunch of them. > Given that we have to manually join search results, because ZCatalog > doesn't support ORs etc (for FieldIndexes), wouldn't it be useful to have > some sort of tool that could take a set of results, and return a result > with only unique values? Yes. There's a propsal on dev.zope.org to expose union and intersection operations to users of the catalog. http://dev.zope.org/Wikis/DevSite/Proposals/UnionAndIntersectionOperations . Comments are appreciated. _______________________________________________ Zope-Dev maillist - Zope-Dev(a)zope.org http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )

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Re: [Zope-dev] ZCatalog features
by Chris McDonough 30 Apr '01

30 Apr '01

RE: [Zope-dev] ZCatalog features> I think that the idea of exposing these _in addition_ to (as opposed to instead > of) the current way it works is a good idea. What does "these" refer to here? if you mean intersection and union operations, this is the plan. > How hard would it be to add the current 'user visible' boolean logic to field > types other than text? I'm not sure what you mean... what feature are you referring to? Thanks! - C -----Original Message----- From: Chris McDonough [mailto:chrism@digicool.com] Sent: Saturday, 28 April 2001 17:10 To: Morten W. Petersen Cc: zope-dev(a)zope.org Subject: Re: [Zope-dev] ZCatalog features "Morten W. Petersen" wrote: > > Hia guys, > > A couple of comments and questions about the ZCatalog: > > Is it possible to pass an argument to the catalog so that returned brains > would instead be actual objects? Not currentl, although the new brain objects have a method 'getObject' that makes getting the object straightforward while you're iterating over a bunch of them. > Given that we have to manually join search results, because ZCatalog > doesn't support ORs etc (for FieldIndexes), wouldn't it be useful to have > some sort of tool that could take a set of results, and return a result > with only unique values? Yes. There's a propsal on dev.zope.org to expose union and intersection operations to users of the catalog. http://dev.zope.org/Wikis/DevSite/Proposals/UnionAndIntersectionOperations . Comments are appreciated. _______________________________________________ Zope-Dev maillist - Zope-Dev(a)zope.org http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )

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ZPT 1.2, TAL 1.2, ZTUtils 1.0 Released
by Evan Simpson 29 Apr '01

29 Apr '01

Actually, I uploaded these at 5pm today, then I had to run and catch a plane. I still haven't updated the Project wiki, but if you visit: http://www.zope.org/Members/4am/ZPT ...you can pick up the latest. You need to download all three; PageTemplates goes in a Products directory, TAL and ZTUtils go in 'lib/python'. There's a trio of example Page Templates (with support data) that you can try out by copying PageTemplates/examples/zpt_examples.zexp into your import directory and importing it somewhere. One of them shows off batching, another shows how to make a tree widget, and the third calls DTML from ZPT. Cheers, Evan @ digicool

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Re: [Zope-dev] CST 0.8 Updater Fixed...
by Dieter Maurer 29 Apr '01

29 Apr '01

Chris Withers writes: > Chris McDonough wrote: > > > > This is due to the relationship between ZServer and the publisher. > > Sometimes it can be a bad thing... especially when there's an expensive > > method that folks fire off that takes a long time.. nothing comes back to > > their browser, so they press stop and hit the page again... etc. etc. So > > you have a number of threads hung. > What would it take to fix it? It would be quite difficult, as Python "threads cannot be destroyed, stopped, suspended, resumed, or interrupted." (Quote from Python's 2.1 "threading" module documentation) Thus, you would need to implement an abortion protocol, e.g. via common storage. The worker thread would need to check periodically whether it should abort. As often external C code is responsible for hanging threads (e.g. expensive database queries), we could at least do not make it safe. Dieter

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Re: [Zope-dev] Opening the Zope repository...
by Dieter Maurer 29 Apr '01

29 Apr '01

Brian Lloyd writes: > http://dev.zope.org/Wikis/DevSite/Proposals/OpenTheZopeRepository Nice that the open repository should come! Apart from that the document does not yet say very much. I have no strong preferences for the specific hosting (SourceForge versus bayMountain) other than that SourceForge seems to run quite well with lots of projects and lots of people. I am a bit concerned about the legal implications for contributors. Of course, DC wants to fight malicous activities and carelessness affecting the quality of Zope code. On the other hand, everybody makes errors despite care and best intentions. Some may later prove fatal. I think, it would not be adequate to legally threaten contriuters more than DC itself is threatened by her Zope customers. Risks in this area should instead be minimized through an appropriate process that spreads responsibility to more people, by e.g. peer review, test and documentation obligations for changes, extensive testing before modified code enters a core Zope distribution. Dieter

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Zope Server hanging :-(
by Tim McLaughlin 29 Apr '01

29 Apr '01

Chris (and all), We seem to be having similar crashing issues. And interestingly enough, they don't seem to show up on any of our servers except the 2.3.0 upgraded to 2.3.1. 1. Hangs on anything from Pythonscript or dtml 2. top shows no significant mem or cpu usage 3. threads are all unresponsive 4. restart usually yields a .trX file (an aborted transaction I suppose) Any ideas? Maybe it was something "fixed" in 2.3.1? The causes seem to be somewhat different except that they all modify the ZODB.... Tim

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Zope Server hanging :-(
by Chris Withers 29 Apr '01

29 Apr '01

Hi, Well, I thought the upgrade to 2.3.2b2 would solve the problem but it hasn't :-( I have a (very important :-S) Zope instance which hangs at what seems like the slightest touch. The symptoms are as follows: 1. Go to a given URL, which doesn't respond (browser sits and spins) 2. Doing a 'top' on the server shows python nowhere to be seen (so it's not infinite-loop-processor-hogging) 3. ps shows the python threads are all still there, but none of them will respond. 3. doing a ./stop sucessfully stops Zope (the broswer returns a 'reset by peer') 4. doing a ./start yields the following the the stupid log file: 2001-04-27T15:05:38 PANIC(300) z2 Startup exception Traceback (innermost last): File /usr/local/zope/Zope-2.3.2b2-src/z2.py, line 566, in ? File <string>, line 1, in ? File /usr/local/zope/Zope-2.3.2b2-src/lib/python/Zope/__init__.py, line 110, in ? File /usr/local/zope/Zope-2.3.2b2-src/lib/python/ZODB/FileStorage.py, line 264, in __init__ File /usr/local/zope/Zope-2.3.2b2-src/lib/python/ZODB/lock_file.py, line 101, in lock_file StorageSystemError: Could not lock the database file. There must be another process that has opened the file. <p> 5. The only way I can get Zope to start again is do do a: killall -9 python ...now start behaves normally and the cycle begins again (averaging around once every 10 minutes now :-( ) Can anyone suggest how I might go about tracking this down? It's really beginning to piss me off. That said, I've seen quite a few posts now complaining about Zope hanging and crashing, so I'm actually beginning to worry about using Zope from a stability point of view. Help! Chris

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BTreeFolder
by Chris Withers 29 Apr '01

29 Apr '01

Hi Shane, will you be releasing a new version of BTreeFolder that makes use of the new funky BTrees at any stage? cheers, Chris

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ZPatterns Rack question..
by cs＠comlounge.net 28 Apr '01

28 Apr '01

Hi! First of all one note to the sql attribute provider: My problem seems to be solved now. Actually it was quite easy.. dunno why it took the long way.. thanks anyway to Phillip and Steve! But I have another problem now: I have some rack with persistent objects in it. Now I want to migrate my site to production. Problem: If I do this more often and the objects are within some Rack, then also these get copied to the production site and the old objects will get deleted there. Is there any way to first backup the contents of some rack? Or do I need to construct it all as external storage? (basically most things are in an sql db already, I just put image data etc. into the rack directly as I don't need relational access to it..) Actually I know how to read the objects from the BTree but I dunno how to store them again into another rack (which has the same storage attribs of course). Can I simply use _setRack()? I guess not, eh? :) Thanks for any hints in advance! regards, Christian -- COM.lounge http://comlounge.net/ communication & design info(a)comlounge.net

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ZCatalog features
by Morten W. Petersen 28 Apr '01

28 Apr '01

Hia guys, A couple of comments and questions about the ZCatalog: Is it possible to pass an argument to the catalog so that returned brains would instead be actual objects? Given that we have to manually join search results, because ZCatalog doesn't support ORs etc (for FieldIndexes), wouldn't it be useful to have some sort of tool that could take a set of results, and return a result with only unique values? Cheers, Morten

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