[rules-users] Drools and Java EE

Thu Aug 26 16:15:54 EDT 2010

The changeset itself dictates what resources to monitor, if I understand it
properly, so if you're just looking for new packages just add them to the
changeset.  You probably know that already.

See the <addResource> line in KnowledgeBases.xml.

But yes, that's all within one KnowledgeBase (I should rename the default
name of that changeset file to KnowledgeBase.xml or something like that.).

Anyhow, I suspect that it would be useful to allow the resource adapter to
create more than one KnowledgeBase.  I'm not entirely sure, frankly, how to
set that up.  I think that since a KnowledgeBase maps to the overly latinate
and annoying JCA concept of a (deep breath) user connection factory {eyes
glaze over}, that there's probably a way to move the KnowledgeAgent creation
code out of the resource adapter bootstrap area and into...into...a better
area {handwave, handwave} where several KnowledgeAgents might be able to be
built.

Short answer: no.  :-)  Longer answer: yeah, there should be a way to do
that.

Best,
Laird

On Thu, Aug 26, 2010 at 4:10 PM, Andrew Waterman-2 [via Drools - Java Rules
Engine] <ml-node+1360000-469092184-10124 at n3.nabble.com<ml-node%2B1360000-469092184-10124 at n3.nabble.com>
> wrote:

> Just found the configuration in ra.xml:
>
>     <config-property>
>       <config-property-name>changeSetResourceName</config-property-name>
>       <config-property-type>java.lang.String</config-property-type>
>
>  <config-property-value>rules/KnowledgeBases.xml</config-property-value>
>     </config-property>
>
> Can I get it to support more than one changeSet?  It would be nice to pass
> a list to monitor.
>
> best,
>
> A
>
> On Aug 26, 2010, at 3:04 PM, Andrew Waterman wrote:
>
> Hey Laird,
>
> How do I configure the resource adaptor to load a specific resource?   I
> have two changesets I would like it to monitor.  Is this handled in the
> ra.xml?  I couldn't seem to find what it was monitoring. :)
>
> best wishes,
>
> Andrew
>
> On Aug 25, 2010, at 4:24 PM, Andrew Waterman wrote:
>
> Huge thanks!
>
> best,
>
> A
>
> On Aug 25, 2010, at 12:55 PM, ljnelson wrote:
>
> Have a look at http://code.google.com/p/drools-jca/.
>
> This is not (clearly) released yet; have a look at the source and see what
> you think.
>
> To build it: check it out, then, with Maven 2.2.1, run mvn clean install
> from the root.
>
> If you have all the right repositories set up in your settings.xml,
> everything should complete normally.  If you don't, Maven will tell you what
> artifacts are missing, and a quick Google search will unveil the
> repositories they're hosted in.
>
> Best,
> Laird
>
> On Wed, Aug 25, 2010 at 1:39 PM, Andrew Waterman-2 [via Drools - Java Rules
> Engine] <[hidden email] <#12ab0057a653eef3_>> wrote:
>
>> Very useful to the JEE community Laird.  I just recently started working
>> with the KnowledgeAgent and Drools Guvnor; so I really feel the need.
>>  Please do let us all know when your implementation is available in the
>> trunk and/or a standalone version. :)
>>
>> best wishes,
>>
>> Andrew
>>
>>
>> On Aug 24, 2010, at 9:50 PM, ljnelson wrote:
>>
>> >
>> > Hello; I've made a JCA resource adapter for Drools.
>> >
>> > I've had to hack quite a bit to get it so that the KnowledgeAgent- and
>> > resource-scanning-related parts don't use Threads, but, instead, use the
>>
>> > JCA-supplied WorkManager and BootstrapContext#createTimer() for
>> asynchronous
>> > operations (like resource scanning and notifying).
>> >
>> > Here are some changes it would sure be nice to see, that I needed to
>> hack
>> > around in order to make it so that a KnowledgeAgent-produced
>> KnowledgeBase
>> > could be shared by Java EE components in a specification compliant
>> manner:
>> >
>> > 1. ResourceChangeNotifierImpl#ProcessChangetSet is an inner class that
>> is
>> > marked as public static, but which has a package-protected constructor.
>>  I
>> > have to create a new instance of this in order to create a
>> > ResourceChangeNotifierImpl subclass that doesn't use threads.  I hope
>> this
>> > constructor could be made public instead.  Right now I'm calling
>> > setAccessible(true).  Yecch.
>> >
>> > 2. ResourceFactory#setFactoryService(): sure do wish this were public,
>> or
>> > that there were another way to install a ResourceFactoryService.  I need
>> to
>> > do this so that the scanner and notifier are under my control (and don't
>> use
>> > Threads, but instead use Timers as provided by the JCA BootstrapContext
>> > class).  It appears that I do have some control here in Drools 5.1 with
>> the
>> > (undocumented) ServiceRegistry interface (how do I get an instance of
>> it?
>> > what does it do? is it used pervasively?), but I don't know, since it's
>> > undocumented, whether it's the preferred way to do this sort of thing or
>>
>> > not.
>> >
>> > 3. All this indirection is really quite clunky, especially given the
>> > META-INF/services facility.  Was there a good reason this was not used?
>>  I'm
>> > sure there was something, because having to consult a factory for a
>> service
>> > to get a provider to produce an instance of something is a bit much.
>> >
>> > Hacking around those limitations, I was able to produce a Drools
>> resource
>> > adapter that vends KnowledgeBase instances as its user connection
>> factories.
>> > This means to use it in a spec-compliant manner, you do this in your
>> > stateless (or stateful) session bean:
>> >
>> > @Resource
>> > private KnowledgeBase kb;
>> >
>> > ...and you get injected a wrapper KnowledgeBase that uses the Java EE
>> > container's JCA machinery to invoke operations on the shared
>> KnowledgeBase.
>> >
>> > Is this something that would be interesting to other people?  If so I am
>>
>> > happy to open source it.
>> >
>> > Thanks for a great toolkit.
>> >
>> > Best,
>> > Laird
>> > --
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