On Apr 17, 2009, at 7:38 AM, Jarosław Barcewicz wrote:
Hi,
I have application that allows user to make searches over database
that can last for few minutes. Using WOLongResponsePage user can see
some time counting :D when his query is executed. Query is custom
created and fired by EOUtilities.rawRowsForSQL. Problem is, that new
user (new session just created) cannot log in even see start page.
If you are dispatching requests concurrently, they should at least be
able to get to the start page. But that won't be of any benefit.
I've tried some solutions passed here. One that works is to create
ERXObjectStoreCoordinator per session. This works, but when I was
testing it simulating many users (about 100) database connection
pool ends and application still wanted to create new ones. In
session constructor I use:
ERXObjectStoreCoordinator objectStoreCoordinator = new
ERXObjectStoreCoordinator();
EOEditingContext editingContext = ERXEC.newEditingContext();
setDefaultEditingContext(editingContext)
Yes, that can have bad results with memory usage and database
connection usage.
If I don't create ERXObjectStoreCoordinator, new user with new
session cannot use db during database channel is occupied by
searching thread and new db channel is not created. I thought that
database connections are created when all from pool are busy, when
some are free - session uses them. How to manage such situation,
maybe I misunderstand something?
The above code automatically creates new ones. You will probably be
better off creating a pool for the long running searches and leave the
normal session processing untouched.
I tried to follow the instruction of Miguel Arroz from http://terminalapp.net/dr-optimistic-locking/
but setting
er.extensions.ERXObjectStoreCoordinatorPool.maxCoordinators to some
value changes nothing.
Does you Application extend ERXApplication and Session extend
ERXSession?
Could you explain me how to use, in simplest case,
ERXObjectStoreCoordinatorPool, ERXObjectStoreCoordinator and
ERXObjectStoreCoordinatorSynchronizer? I can't figure out how to use
them together.
I don't use those, but managing a simple pool yourself for the long
running searches might be easier. Even if you use
ERXObjectStoreCoordinatorPool, you are still going to want a new EOF
stack for the long searches. You should probably concentrate on that
problem first.
Chuck
Thanks in advance, :D
Jarek
--
Jaroslaw Barcewicz
Software Developer
Power Media S.A.
http://www.power.com.pl
District Court for Wroclaw-Fabryczna
KRS: 0000281947
NIP: PL-898-16-47-572
Capital stock: 640 000 PLN
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
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