1) Yes, you assumptions are correct
imagine this code
Map map = (Map)session.getAttribute("map");
map.put("test","test");
in this scenario, the simple tcp replication manager comes in handy.
2) Session activate/passivate is not invoked. I didn't really think of it as
activation/passivation when it gets replicated. I can for sure add it in, if
there is a need for it. Enabling debug mode using log4j will show you
exactly what sessions get replicated and when,
for more info on how to do that,
http://www.mail-archive.com/[EMAIL PROTECTED]/msg126799.html
-----Original Message-----
From: Weseloh, Nicole [mailto:[EMAIL PROTECTED]
Sent: Friday, June 04, 2004 5:26 AM
To: Tomcat Users List (E-Mail)
Subject: Session Replication with Tomcat 5.0.19
Hello,
I've got two questions concerning in memory session replication:
1.) What exactly is the difference between SimpleTcpReplicationManager and
DeltaManager?
I guess that SimpleTcpReplicationManager replicates the whole session, while
DeltaManager replicates only the attributes which changed. Is that correct?
As far as I see, DeltaManager's performance would be much better, so what
reasons could there be to use a SimpleTcpReplicationManager after all?
2.) I'd like to have a logmessage each time a session gets replicated (just
for "learning" purpose, I like to see what's going on... ;-) ), so one of my
objects I store in each session implements HttpSessionBindingListener and
HttpSessionActivationListener.
The object is definitely stored in the session (valueBound() shows me in the
log..), and the session gets replicated, I guess - at least, I've got the
valueBound() - log on both cluster nodes. However, willPassivate() and
didActivate() are never called. (no log output there. ) Yes, I've set
"useDirtyFlag = false" (otherwise, no special configurations in server.xml -
just the default) and the cluster members "know" each other...
I googled a whole day, read the java doc and everything else I could find..
but still couldn't find out how SessionActivation exactly works... I assume
a session "willPassivate", gets replicated and then "didActivate" - or am I
completely wrong?
Thanks,
Nicole
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