-Original Message-
From: Clark OBrien
Sent: Monday, November 05, 2001 7:14 AM
To: '[EMAIL PROTECTED]'; '[EMAIL PROTECTED]'
Cc: '[EMAIL PROTECTED]'
Subject: Zope optimistic transactions.
Chris,
I set up a test harness to exercise zopes optimistic transaction
management.
My test immediatly caused a ZODB exception.
I am running zope 2.42. on win 2k, the scripts are attached.
Results below:
As you recall I posed the following question:
What if you had a directory structure like:
Folder1
Folder-2
Folder-3
...
..
Folder-n
Each folder had an attribute foo and there were two scripts, script1 and
script2.
script1 modified foo on one Folder only while script2 traversed all the
folders modifying the attribute foo on each one of them.
Would the script2 ever commit while the fist while script1 was
continuously called. This is interesting because a call to script2 would
never finish before several calls to script1 finished.
I set up a simple test with only 10 folders. I then wrote the script below
changeLevel2 that is my scri1 above and changeFolders that is my script2
above.
I ran changeLevel2 in a loop using the following code:
script
---
import urllib
params = urllib.urlencode({'theText': 'Vitamin D'})
while 1:
f = urllib.urlopen(http://localhost:8080/Test/changeLevel2?%s; % params)
print f.read()
-script---
-
I then ran the script changeFolders from my browsers.
The result was the following error message:
ZODB.POSException.ConflictError
Sorry, a site error occurred.
Traceback (innermost last):
File C:\zope\lib\python\ZPublisher\Publish.py, line 223, in
publish_module
File C:\zope\lib\python\ZPublisher\Publish.py, line 200, in publish
File C:\zope\lib\python\ZPublisher\Publish.py, line 200, in publish
File C:\zope\lib\python\ZPublisher\Publish.py, line 200, in publish
File C:\zope\lib\python\ZPublisher\Publish.py, line 195, in publish
--
scripts.txt
-changeFolder
--
#changeFolder
#params list: theFolder,theText
theFolder.manage_changeProperties({'foo':theText})
--end
changeFolder---
---changeFolders--
#changeFolders
#Paramater list: myString
# this method changes the attribute foo on several folders.
newFolder = context.getChild(TestFolder )
newFolder.manage_changeProperties({'foo':myString})
import string
for i in range(1,10):
newFolder = newFolder.getChild(TestFolder )
for i in range(1,10):
# lets do something expansive
#for j in range(1,100):
#string.find(its a great day to code python,day)
newFolder.manage_changeProperties({'foo':myString})
return all properties changed
--end
changeFolders
-changeLevel2
#changeLevel2
#paramater list: theText
theFolder = context.getChild(TestFolder )
context.changeFolder(theFolder,theText)
return 'ok'
-end
changeLevel2
-createFolders---
temp = context.manage_addFolder('TestFolder','TestFolder')
newFolder = context.getChild(TestFolder )
newFolder.manage_addProperty(foo,this is a test string, string)
for i in range(1,10):
newFolder.manage_addFolder(TestFolder,TestFolder)
newFolder = newFolder.getChild(TestFolder )
newFolder.manage_addProperty(foo,this is a test string, string)
end createFolders
---
-getChild---
#getChild
#param list: child
getChild: Utility function
Returns ObjectManagerItem whose ID matches child parameter.
Context must be ObjectManager.
for (oid, obj) in context.objectItems():
if oid == child:
return obj
else:
return None
end getChild
-
makeNewFolder-
#makeNewFolder
#param list: root
root.manage_addFolder('TestFolder','TestFolder')
root.manage_addProperty('foo','The world is round only to those who know
