I never had to solve the problem but I believe that maintaining a session across machines can be problematic , at least with tomcat 3.*... Sorry i can be much help in a detailed way becuase I've never tested this.. It could be nonesense, i'm not sure.. I'm sure they'll be some package to deal with this, but again i don't have details.
cheers mark
Mercoledì, 8 gen 2003, alle 12:15 Europe/Rome, [EMAIL PROTECTED] ha scritto:
I'm aware that the developers USING struts have to be careful about how
much they put into session. We can control this. What I'm concerned about
is how much struts might be doing on its own, such as storing the locale.
A few things stored in session is ok, especially if they don't change with
every request, etc.. However, large amounts (size and/or numbers of
objects) of data will significantly reduce scalability in a failover system
due to the fact that the session (or rather any 'new' data in the session)
must be serialized with every request.
Primitives such as Strings are good too since they're immutable. If the
struts framework is storing things such as a hashmap, this too may cause a
problem since the container will not know when to serialize the hashmap
unless the map is handled in an 'immutable' fashion.
Annnnd, since you brought it up.. we will be using a server farm.. what's
the issue you mentioned? Is it particular to tomcat?
Thanks Mark,
George
----- Message from Mark Lowe <[EMAIL PROTECTED]> on Wed, 8 Jan 2003
10:49:44 +0100 -----
How many "things" you put in the session is up to you.. You basically
make strutures (arrays, maps and such forth) available to your
presentation layer by putting into the session, request or application
scope depending on what your "things" have to do..
Issues relating to session will have more to do with the servlet
container than struts itself,
The only issue i'm aware of with sessions in tomcat for example is that
there can be issues if you've a server farm..
The decision of what to put in the session or in the request is down to
whoever designs the system.
Hope this helps
mark
p.s . If anyone knows about the issue of sessions and farms i'd be glad
to hear from anyone who's solved this.
Mercoledì, 8 gen 2003, alle 10:32 Europe/Rome,
[EMAIL PROTECTED] ha scritto:
--I'm a newb to struts, investigating it as a replacement to our home-grown framework. The big issues we're dealing with are scalability and fail-over support. The combination of the two issues require that the session size and number of objects remain small (and generally immutable) for serialization performance issues.My question is 'How much is the struts framework using the session'? I've done a little investigation with some sample example applications and found it's storing only the locale. I know it could also be storing Tokens, but only on demand eh? Do heavier apps or certain functions of struts use the session heavily? Thanks! -George
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