[rules-users] Dynamic updates of stateful sessions

[Esteban Aliverti]

By default, the Knowledge Agent creates a new kbase when changes in the
monitored resources are detected. So the stateful sessions you had are not
going to "see" the changes because they belong to a different kbase.
If you want the agent to apply the changes to the current kbase, you need to
set drools.agent.newInstance property to "false" in knowledge agent
configuration.
You can read about this here:
http://ilesteban.wordpress.com/2010/03/25/knowledge-agent-incremental-change-set-processing-and-binary-diff/

If you are defining the kagent using spring, you can use the "newInstence"
attribute of <kagent> bean.

Best Regards,

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Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


On Mon, Apr 18, 2011 at 11:41 AM, Mattias Avelin <mattias.avelin at netlight.se
> wrote:

> We have a application in which we have both stateless & stateful sessions
> running. We're using the KnowledgeAgent and ChangeSets to automatically
> update our knowledge bases when the rules are changed.
> This works fine for our stateless sessions for which we are creating a new
> session for each request and if the rules have been updated this is
> reflected in next session we create.
>
> But for stateful sessions I'm not quite as sure on how to get it working. I
> can see in the logs that the KnowledgeBase is re-built when the
> KnowledgeAgent detects the updated rule files. But my "long running"
> session
> is does not reflect these changes (which it shouldn't right?). But how do
> we
> apply these changes to the stateful session without loosing all the facts I
> accumulated?
>
> The way I've solved it now is to keep a "last updated" timestamp for the
> knowledgeBase and a "created" timestamp for the session and then compare
> these before using the session. If the knowledgeBase's "update timestamp"
> is
> later that the sessions "creation timestamp" I create a new Session and
> then
> "manually" copy all facts from the former to the latter.
>
> Is this the way you would do this or is there a better way?
>
> Best Regards
>
> Mattias Avelin
>
>
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