Drools rule engine pool
by Donald Winston
Is it beneficial/necessary to pool rule engine sessions?
If not then all I have to do is cache the KnowledgeBase and get a rule engine session whenever I need it?
13 years, 8 months
Re: [rules-users] Database problem
by nch
Are you using drools-server through REST? Isn't it hard when you have to define a new OO-XML mapping each time you have to invoke drools with a different model?
Regarding the "from" conditional element, I'm looking for a bidirectional synchronization (DB <-> WM). I'm not sure it can be achieved using "from". Has anyone an example?
Many thanks!
--- El vie, 27/8/10, paulB <paul.borlin(a)sironahealth.com> escribió:
> De: paulB <paul.borlin(a)sironahealth.com>
> Asunto: Re: [rules-users] Database problem
> Para: rules-users(a)lists.jboss.org
> Fecha: viernes, 27 de agosto, 2010 14:26
>
> We were faced with the same issue. Eventually, I
> realized that we did not
> need to have all the data in working memory at once.
> I was able to break
> down the use of the rules engine into smaller logical
> chunks. I now have a
> stateless session that the facts at hand "fly through" the
> engine on demand.
> Other code does the fetching the next step. I've even
> used Drools Flow to
> break down these chunks.
>
> Another thought, have you looked at the from conditional
> element? That may
> be the intermediary you're looking for.
>
> http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/ht...
> 4.8.3.8. Conditional Element from
>
>
> Lastly, there is a case where we would need quite a bit of
> data in working
> memory for things to work correctly. We are now
> looking at Drools Solver to
> narrow a subset of data that would be inserted into working
> memory.
>
>
> This link may be helpful in your research as well:
> http://blogs.illation.com.au/2009/07/drools-performance-comparison/
> --
> View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Database-problem-tp13...
> Sent from the Drools - User mailing list archive at
> Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
13 years, 8 months
Contributer Agreement
by Mark Proctor
To anyone who has signed the previous contributor agreement, it has
just been updated so you will receive an email requesting you re-sign
it. Don't panic, just re-sign it and carry on as normal :)
Thanks
Mark
13 years, 8 months
Template bug on "package" keyword
by drdaveg
I am trying to incorporate several templates in a single output drl file.
According to the 5.0.1 docs "package" is optional:
Example 5.3. Rule template file: templates
template header
parameter-name-1
...
parameter-name-n
package ... # optional
However, it seems that the drools parser uses "package" as a keyword to
identify when it has passed header information. Not having a "package"
specifier in either 5.0.1 or 5.1.1 yields:
java.lang.IllegalArgumentException: value rule "rules for reject non-header
@{id}" is not a valid column definition
at
org.drools.template.parser.ColumnFactory.getColumn(ColumnFactory.java:34)
which cannot be overcome by tricks like
// package a.b.c
or
# package a.b.c
Are other people experiencing this? Is there a fix planned for the parser?
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13 years, 8 months
OptionalDataException on reading packages..
by mechlife
I have the application setup where the drl is generated from the database and
then written to the file system. So far i have been working with the drl's
without any problems but have run into issues while working with packages.
Any help is much appreciated. Thanks.
Here is what i am doing while serializing the package.
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl(new StringReader(drl));
Package pkg = builder.getPackage();
DroolsStreamUtils.streamOut(new ObjectOutputStream(new FileOutputStream(new
File(fileName+".pkg"))), pkg);
i also tried the writeExternal on package, this genereate the file but got a
class cast exception while trying to load it.
The pkg file is generated and i dont think it has a problem unless i am
missing something in the above code.
Now, on the other side i am using drools-spring which sets up the agent on
startup. I was doing some trial and error and found two configurations that
worked but needed
ResourceFactory.getResourceChangeScannerService().start();
ResourceFactory.getResourceChangeNotifierService().start();
to be in code, just the spring configuration didnt work (again if i am
missing something please let me know).
here are the spring configuration
First
<drools:kagent id="agent" kbase="base" new-instance="true"/>
<drools:kbase id="base">
<drools:resources>
<!--drools:resource type="DRL" source="file:C:\file.drl"/--> //this works
<drools:resource type="PKG" source="file:C:\file.pkg"/>
</drools:resources>
</drools:kbase-->
Second
<drools:kagent id="agent" kbase="base" new-instance="true">
<drools:resources>
<drools:resource type="CHANGE_SET" source="file:C:\change-set.xml"/>
</drools:resources>
</drools:kagent>
<drools:kbase id="base"></drools:kbase>
and the changeset
<change-set...>
<add>
<resource source='file:/C:/file.pkg' type='PKG'/>
</add>
</change-set>
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13 years, 8 months
Hibernate + Bitronix + Tomcat working configuration
by Gustavo Tenrreiro
Hi,
Does anyone have a working Hibernate + Bitronix + Tomcat configuration
which works with Drools process persistence ?
If so can you share it?
In my case Hibernate just does not find the Datasource, no matter what I do.
Thanks
13 years, 8 months
Rewind Drools Flow
by jawa
Hi,
Is there anyway we can rewind the drools flow? I mean I save my flow in db
and at a later stage I want to rewind it and start it from some other node
instead of the one it was paused at. Has anyone tried this kind of thing
before?
I've got Human Tasks in my flow and my flow stops at one of the Human Task
and then resumes from it fine. But for a specific scenario I want my flow to
start from some other Node instead of the one it was paused at.
Thanks
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13 years, 8 months
