3:53 p.m.
If I use the KnowledgeAgent with the 'drools.agent.newInstance' property set to
'false' to automatically reload my KnowledgeBase when resources in the changeset
are updated, what happens to any existing sessions when the agent detects changes and
reloads the KnowledgeBase? Do they continue to use the old rules or are they somehow
reloaded in midstream? What adverse effects might I see?
I ask because I'm trying to rework some existing classes that were written to
facilitate the loading and caching of KnowledgeBases created in different ways - e.g.
loading decision tables, loading .drl and .rf files in the traditional manner, loading
.drl and .rf files using an agent. I'd like to be able to grab a KnowledgeBase from
the cache regardless of how it was created, create a session from it, and fire all of the
rules, but I'm concerned about cached KnowledgeBases created by KnowledgeAgents. If I
set the newInstance property to 'true', my cached KnowledgeBase will never see the
updates. If I set it to 'false', my cached KnowledgeBase should see the changes,
but I'm concerned about the behavior in any currently running sessions.
FYI - the classes were originally written using the Drools 4.07 RulesAgent for caching
RuleBases that needed to be automatically reloaded. It seems to be working as expected.
I'm trying to update those classes to use Drools 5.1 classes instead.
Thanks,
Jamie
10:29 a.m.
hi,
Your current session shouldn't be affected. Only newly created sessions
will see the changes
On 16/05/2011 14:53, Jamie Shaw wrote:
raditional manner, loading .drl and .rf files using an agent.
I'd like to be able
--
Greg Stasica
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2:59 p.m.
Thanks Greg - that's what I was hoping.
Just to confirm - I should be able to cache a KnowledgeBase created by a
KnowledgeAgent with the 'drools.agent.newInstance' property set to
'false'
without seeing any unexpected results if the KnowledgeBase gets refreshed by
the agent.
Given that, why would I ever set the 'drools.agent.newInstance' property to
'true'? It doesn't seem like it would buy me anything except extra object
creation...
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3:26 p.m.
A recent thread explained that a running stateful session would indeed "see"
the KnowledgeBase update done by the KnowledgeAgent provided
newInstance is set to "false".
-W
On 17 May 2011 14:59, Jamie <jshaw(a)llbean.com> wrote:
Thanks Greg - that's what I was hoping.
Just to confirm - I should be able to cache a KnowledgeBase created by a
KnowledgeAgent with the 'drools.agent.newInstance' property set to
'false'
without seeing any unexpected results if the KnowledgeBase gets refreshed
by
the agent.
Given that, why would I ever set the 'drools.agent.newInstance' property to
'true'? It doesn't seem like it would buy me anything except extra object
creation...
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3:52 p.m.
Thanks for pointing me to that thread, Wolfgang - very interesting
discussion. It confirms my fear, at least for stateful sessions. Do you
know if it's true for stateless sessions as well?
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5:39 p.m.
IIRC, for stateless sessions only the next session you create from
the updated RuleBase is affected.
-W
On 17 May 2011 15:52, Jamie <jshaw(a)llbean.com> wrote:
Thanks for pointing me to that thread, Wolfgang - very interesting
discussion. It confirms my fear, at least for stateful sessions. Do you
know if it's true for stateless sessions as well?
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5:58 p.m.
That's good news - thanks again!
-- Jamie
________________________________
From: Wolfgang Laun-2 [via Drools]
[mailto:ml-node+2952942-1245008499-397044@n3.nabble.com]
Sent: Tuesday, May 17, 2011 11:41 AM
To: Jamie Shaw
Subject: Re: [rules-users] Effect of KnowledgeAgent reload on currently running rules
IIRC, for stateless sessions only the next session you create from
the updated RuleBase is affected.
-W
On 17 May 2011 15:52, Jamie <[hidden
email]</user/SendEmail.jtp?type=node&node=2952942&i=0>> wrote:
Thanks for pointing me to that thread, Wolfgang - very interesting
discussion. It confirms my fear, at least for stateful sessions. Do you
know if it's true for stateless sessions as well?
--
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3:39 p.m.
I'm not sure how the rete is modified and if the modifications are
synchronized with any ongoing operation.
If you want to make sure that the rete is modified when your application is
in a "safe-point", then you will need to turn off ResourceChangeMonitor
service and call its scan() method manually.
We are already doing that in some of Kagent's tests. You can take a look to
these 2 classes:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
<https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
<https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com
2011/5/17 Jamie <jshaw(a)llbean.com>
That’s good news – thanks again!
-- Jamie
------------------------------
*From:* Wolfgang Laun-2 [via Drools] [mailto:ml-node+[hidden
email]<http://user/SendEmail.jtp?type=node&node=2953003&i=0>]
*Sent:* Tuesday, May 17, 2011 11:41 AM
*To:* Jamie Shaw
*Subject:* Re: [rules-users] Effect of KnowledgeAgent reload on currently
running rules
IIRC, for stateless sessions only the next session you create from
the updated RuleBase is affected.
-W
On 17 May 2011 15:52, Jamie <[hidden
email]<http://user/SendEmail.jtp?type=node&node=2952942&i=0>>
wrote:
Thanks for pointing me to that thread, Wolfgang - very interesting
discussion. It confirms my fear, at least for stateful sessions. Do you
know if it's true for stateless sessions as well?
--
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3:44 p.m.
Thanks, Esteban. I'm going to need to do some testing. I'll post back my
findings...
-- Jamie
________________________________
From: Esteban [via Drools] [mailto:ml-node+2961373-771292982-397044@n3.nabble.com]
Sent: Thursday, May 19, 2011 9:41 AM
To: Jamie Shaw
Subject: Re: [rules-users] Effect of KnowledgeAgent reload on currently running rules
I'm not sure how the rete is modified and if the modifications are synchronized with
any ongoing operation.
If you want to make sure that the rete is modified when your application is in a
"safe-point", then you will need to turn off ResourceChangeMonitor service and
call its scan() method manually.
We are already doing that in some of Kagent's tests. You can take a look to these 2
classes:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
<https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
<https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com
2011/5/17 Jamie <[hidden
email]</user/SendEmail.jtp?type=node&node=2961373&i=0>>
That's good news - thanks again!
-- Jamie
________________________________
From: Wolfgang Laun-2 [via Drools] [mailto:[hidden
email]</user/SendEmail.jtp?type=node&node=2961373&i=1>[hidden
email]<http://user/SendEmail.jtp?type=node&node=2953003&i=0>]
Sent: Tuesday, May 17, 2011 11:41 AM
To: Jamie Shaw
Subject: Re: [rules-users] Effect of KnowledgeAgent reload on currently running rules
IIRC, for stateless sessions only the next session you create from
the updated RuleBase is affected.
-W
On 17 May 2011 15:52, Jamie <[hidden
email]<http://user/SendEmail.jtp?type=node&node=2952942&i=0>> wrote:
Thanks for pointing me to that thread, Wolfgang - very interesting
discussion. It confirms my fear, at least for stateful sessions. Do you
know if it's true for stateless sessions as well?
--
View this message in context:
http://drools.46999.n3.nabble.com/rules-users-Effect-of-KnowledgeAgent-re...
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8 comments
5 participants
participants (5)
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Esteban Aliverti -
Greg Stasica -
Jamie -
Jamie Shaw
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Wolfgang Laun