Funny you should mention this method of using lockfile objects, that is
exactly the model we are going to use here to solve the problem. I'll let
you know if it works for us
Jose
-------- Original Message --------
Subject: RE: [Webware-discuss] At a loss please help with Sessions and
Tasks
From: Roger Haase <[EMAIL PROTECTED]>
Date: Thu, May 29, 2003 7:42 am
To: jose <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
--- jose <[EMAIL PROTECTED]> wrote:
> Exclent point, Here is what I need to do, I have a web application
> which
> allows users to interact with a flash object on a web page. Now for
> the
> problem the flash object writes an XML file to the server (I didn't
> make
> the flash object so I don't have control of this object), so I need
> to
> make sure that only one person has access to the object at any given
> moment.
I had a roughly similar problem, wanting to control one-at-a-time
access to a logical chunk of several MySQL tables. Along the way, I
also implemented a mechanism to limit the number of simultaneous
users. I did this by adding lock objects and dictionaries at the
module level of my SitePage.
After getting a little help here, I was able to add a feature to
pickle the state of these dictionaries and reload them when my
SitePage was reloaded (very helpful during testing). Your locks will
be different than mine, but here is my SitePage module level code to
pickle and unpickle my the dictionaries I use to control access
(spActiveUsers,spActiveFolders,spActiveUerTimeout dictionaries and
associated locks are defined elsewhere and not shown):
# variables used to preserve state across restarts
spSaveState = 1
spPickleFileName = 'PickledState.dra'
file = spConfigs['baseDirectory'] + spPickleFileName
# get previous state if there is one
try:
pFile = open(file,'r')
spActiveUsers,spActiveFolders,spActiveUserTimeout =
cPickle.load(pFile)
pFile.close()
except:
pass
# special function to save module state in case of a restart
def saveState():
'''Pickle key fields and write to disk.'''
file = spConfigs['baseDirectory'] + spPickleFileName
pFile = open(file,'w')
cPickle.dump((spActiveUsers,spActiveFolders,spActiveUserTimeout),pFile)
pFile.close()
Then within my logon process, I have a small bit of code that gets
executed the first time someone logs on. "saveState" will get called
when the AppServer is restarted.
#one time only, set means of saving global variables
global spSaveState
if spSaveState:
spSaveState = 0
self.application().addShutDownHandler(saveState)
HTH,
Roger Haase
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