Re: [Webware-discuss] WebKit + Cheetah multithreading problem

[Tracy S. R. <tr...@re...>]

I'm not sure exactly why, but to fix it, you should cache the Template  
*classes* instead of the instances, and then instantiate the template  
with the appropriate search list in your 'renderView' method.  You  
probably don't even need the cache if you switch to instantiating it  
within the renderView method.

It could be something like this:

	def renderView(self, viewName=None, viewData=None):
		if not viewName:
			viewName = self.getDefaultViewName()
		# --//  <templates> would be the folder/package where your templates  
are stored
		viewKlassName = 'templates.%s' % viewName
		import templates
		klassModule = __import__(viewKlassName, globals(), locals(),  
viewKlassName)
		klass = getattr(klassModule, viewKlassName)
		searchList = self.constructTemplateNamespaces(viewName, viewData)
		t = klass(searchList=searchList)
		self.write(str(t))

--T

On Tuesday, August 5, 2003, at 11:24 AM, Max Ischenko wrote:

> Hello.
>
> I'm using WebKit along with Cheetah template engine and got very
> annoying problem which I failed to solve. It seems to be related to
> the multithreading issues though.
>
> When two different clients access the same page one sometimes get data
> for the other client. Each client's data is stored in self.session()
> variable so I can't understand how this could be. Page is dynamically
> generated with the help of Cheetah API.
> The problem may be caused by page generated with wrong data but I guard
> the generation routine with threading.Lock.
>
>
> Here is relevant code excerpt:
>
>   def renderView(self, viewName=None, viewData=None):
>     "called by Page.writeHTML"
>     if not viewName:
>       viewName = self.getDefaultViewName()
>     filename = self.getViewFileName(viewName)
>     try:
>       self.lock.acquire()
>       try:
>         searchList = self.constructTemplateNamespaces(viewName,  
> viewData)
>         t = templatesCache.get(filename)
>         self.augmentSearchList(t, searchList)
>         response = str(t)
>         self.write(response)
>       finally:
>         self.lock.release()
>
> templates are cached in the global templatesCache var.:
> class CheetahTemplateFileCache:
>   """
>   Caches Cheetah's template files.
>   """
>   def __init__(self):
>     self.cache = {}
>   def get(self, fileName):
>     "Returns a Cheetah's Template for given file name."
>     t = None
>     if not self.cache.has_key(fileName):
>       mtime = time.time()
>       t = Template(file=fileName)
>       self.cache[fileName] = (t, mtime)
>     else:
>       t, mtime = self.cache[fileName]
>       if os.path.getmtime(fileName) > mtime:
>         mtime = time.time()
>         t = Template(file=fileName)
>         self.cache[fileName] = (t, mtime)
>     return t
>
> templatesCache = CheetahTemplateFileCache()
>
>
> Any ideas?
> More information could be supplied if needed.
>
> --  
> Regards, max.
>
>
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-	-	-	-	-	-	-	-
	Tracy S. Ruggles
Chief Technology Officer, Axiomfire
tr...@ax...  ::  512/461.6199
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