[jboss-user] [Clustering/JBoss] - Re: ConcurrentModificationException during session serializa

[smarlow@redhat.com]

anonymous wrote : FYI, before this thread got going I'd been thinking (vaguely) in terms of using read/write locks in AS 6 to better handle coordination. E.g., in ClusteredSessionValve acquire a RL before passing the request down the pipeline, release when it returns, acquire a WL before handling replication. Basically, allow concurrent access to a session but lock out requests while a thread is replicating.
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In the current case,  the application code is synchronizing on the session facade object, so they would be left out if we synchronize on an internal r/w lock.

I wonder if we could somehow expose our (HTTP session level) r/w lock object to the application (in a reasonably portable way), so that they could also get a RL when getting the attribute values.  Applications will also want to get a WL when setting attribute values.



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