[rules-users] Dynamic updates of stateful sessions

[Esteban Aliverti]

@Wolfgang, maybe I need to update the documentation to explicitly inform
about this behavior :). The agent doesn't make anything special to sync the
sessions with the kbase. If you add a rule by hand to an existing kbase, all
the session from this kbase will automatically detect the changes.
Now I'm working in a helper class to create and apply change-set in a
programatic way. So if you don't want kbases to be automatically modified
when a resource chages, you can use this helper class.

Best Regards,

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


2011/4/20 Wolfgang Laun <wolfgang.laun at gmail.com>

> 2011/4/20 Esteban Aliverti <esteban.aliverti at gmail.com>
>
>> @Wolfgang: if you are using drools.agent.newInstance=true (the default
>> configuration), then whenever a change-set is applied, either because you
>> explicitly force the agent to  do so, or because a monitored resource
>> changes, the kbase inside the agent is thrown away an a new kbase is
>> created. So you need to get the kbase from the agent and retrieve a fresh
>> session from it.
>> You can confirm this behavior in this set of tests:
>> https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/agent/KnowledgeAgentIncrementalChangeSetTest.java
>>
>> But, if you are using drools.agent.newInstance=false the internal kbase
>> (and each stateful session you got from it) is refreshed when a change-set
>> is applied.
>>
>>
> Would you please point me to the doc where it says "and each stateful
> session ... is refreshed"?
>
> If true, this were an extremely risky operation. Consider a stateful
> session whizzing along and - smack! - rules change right in the middle of a
> sequence of firings. Shudder.
>
> -W
>
>
>
>
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