Bip Thelin typed the following on 05:07 PM 3/27/2001 -0800
>Kief Morris wrote:
>>
>> Excellent! Let us know if you need any help.
>
>I will, BTW how is the work on distributed sessions coming along?
>Is it possible to distribute sessions over x number of machines and
>that if one goes down you could go to the other and happily continue
>your session?
No, we're much earlier in the development cycle than that - we haven't
implemented any distributed session support at all. The work we're doing
on PersistentManager is groundwork for distributed sessions. This work
is 90% finished, so after restructuring the relevant class hierarchy a bit
and finishing PersistentManager, we'll be ready to tackle DistributedManager.
The session management system consists of implementations of the Manager,
Session, and Store interfaces found in the root org.apache.catalina package.
When we finish with it, we should have three implementations of Manager:
StandardManager, PersistentManager, and DistributedManager. Any Store
implementations should, in theory, be usable by either of the second two.
So your JDBCStore class, if it works with PersistentManager, should also
work with DistributedManager. The only difference is how the Store is used
by the Manager: PersistentManager only stores the sessions of one JVM,
while DistributedManager will store them for multiple JVMs.
In reality, I suspect that DistributedManager will require changes to the
current Store interface, so if you implement JDBCManager now and get
it working with PersistentManager, it may have to be updated as we
work on DistributedManager. If you want to help with DistributedManager,
doing JDBCStore might be a good first step for you to get your head
into the code. One issue I haven't figured out yet is how to configure
Catalina to use different Store implementations - PersistentManager
currently has FileStore hard-coded. If you want to dig into that it would
be a bonus. Catalina's configuration system is really slick.
There should be some messages of mine from a few months ago in
the archive for this list where I puzzled over some of the particular
issues of implementing DistributedManager which may or may not
be worth looking over.
Kief
