Re: [Zope] speeding up dtml-tree<00b001c006da$d19c4310$6703a8c0@torch>
Clinton Roy writes: > external method restrictions > I'm losing faith people.. Maybe, you should not. There are more ways to build extensions than external methods in "Extension" directories. Each way has its advantages and drawbacks: TypeWeb Manageable requires restart DTML Methods yesno ZClasses yesno External methodspartly no Productspartly yes Python Modules no yes The restrictions for source files in the Extension directories are documented together with a description what to do to circumvent the restrictions: These source files are not imported as standard Python modules but they are read in and executed. As a consequence, Zope may simply reread and reexecute them when they changed. A restart is not necessary. If they could be used like full Python modules, then it would be very difficult to do this in a safe manner unless the Python import and lookup mechanisms are changed. This might be possible but difficult. On the downside, instances of classes defined in these source files can not be pickled (and therefore stored in the ZODB). The pickle mechanism does not understand Zope's read and execute but requires standard Python module import. The workaround: define the classes (!) you need for ZODB objects in true Python modules. The documentation suggests to define them in a properly named subpackage of "Shared" such that maintenance will not become a nightmare. Yes, changes to true Python modules (and therefore to your classes) require a Zope restart. But, hopefully, you will not change your classes too often. You can instantiate your classes, i.e. build instances from them, in external methods, i.e. in source files located in an Extension folder. There is no need to have the same code at two places! Classes for picklable objects or infrastructure to be used in several source files in true Python modules, everything else (if you want) in external methods. Each tool has its strengthes and weaknesses. Know them and use the right tool for your task. This applies both to (sub-)tools inside Zope (e.g. external method versus product versus Python module) as well as to Zope itself (versus ASP, PHP, JSP, ...). Dieter ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] speeding up dtml-tree
"Andy McKay" <[EMAIL PROTECTED]> writes: > A real crude way to hack the dtml-tree tag is to make it always assume there > are child nodes. This prevents the look up and is a lot faster. Think of > Windows Explorer style tag. Not really something I want to do, and in my case wouldn't really help anyway, as the icon chosen quite often depends on children values. Dieter Maurer <[EMAIL PROTECTED]> writes: > You could implement your own cache in your external methods. All I ended up doing was pickling the data structures that I created and doing some simple caching. It works beautifully. Not that Zope helped me at all. I couldn't import modules from the Extensions directory, so I ended up having to put things in $ZOPE/lib/python. For testing I had to have things in the Extensions directory; two copies of things flying around isn't nice. When unpickling under Zope, python couldn't find the class I was referring to, so I ended up just caching the initargs. While none of the above hoop jumping was hard, it was a pain. I certainly hope extensions are supported better in 2.2, in particular: * being able to import modules from the extensions directory * not having naming problems when using extensions under zope I'm about >< close to ditching a Zope talk I was preparing to give to my local Unix users group, but I'm going to see if 2.2 has improved. I'm losing faith people.. -- Clinton Roy ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] speeding up dtml-tree
Clinton Roy writes: > i'm using the dtml-tree tag and generating it's contents via external > methods. Unfortunately child lookups are quite slow, as well as the > icon choosing machinery; is there any way to cache the tree node > objects that my external method creates? The tree tag itself does not cache. You could implement your own cache in your external methods. We extended the tree tag with a "has_branches" argument. If present, it should be a method that tells for the current object whether it has branches (aka children). This reduced the number of database accesses (where our tree data really lives) by an order of magnitude. In principle, I could give you (or the community) a patch for "has_branches". Unfortunately, we extended the tree tag quite drastically (configurable icons, "has_branches", "input type=image" instead of "a href" tags for tree operations). Thus, the "has_branches" extension comes embedded in a big patch that may not be easy to understand. Dieter ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] speeding up dtml-tree
A real crude way to hack the dtml-tree tag is to make it always assume there are child nodes. This prevents the look up and is a lot faster. Think of Windows Explorer style tag. -- Andy McKay, Developer, ActiveState http://www.ActiveState.com Programming for the People - Original Message - From: "Clinton Roy" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 14, 2000 9:06 PM Subject: [Zope] speeding up dtml-tree > hello folks > > i'm using the dtml-tree tag and generating it's contents via external > methods. Unfortunately child lookups are quite slow, as well as the > icon choosing machinery; is there any way to cache the tree node > objects that my external method creates? > > thanks for any help. > -- > Clinton Roy > > > ___ > Zope maillist - [EMAIL PROTECTED] > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) > ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] speeding up dtml-tree
hello folks i'm using the dtml-tree tag and generating it's contents via external methods. Unfortunately child lookups are quite slow, as well as the icon choosing machinery; is there any way to cache the tree node objects that my external method creates? thanks for any help. -- Clinton Roy ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
