Oh, you're right. Oh, I remember what I was thinking. :-) I didn't want to ship with a default change set, because hey, I don't know what your changeset is going to be. So I set up a default place that the resource adapter *looks* for a change set .xml file. If you either (a) put such a changeset in that (classpath) location or (b) change the resource adapter configuration to look somewhere else and put a changeset in THAT location, then everything will be fine.<br>
<br>Here's my changeset:<br><br><?xml version="1.0" encoding="UTF-8"?><br><change-set xmlns="<a href="http://drools.org/drools-5.0/change-set" target="_top" rel="nofollow" link="external">http://drools.org/drools-5.0/change-set</a>" xmlns:xs="<a href="http://www.w3.org/2001/XMLSchema-instance" target="_top" rel="nofollow" link="external">http://www.w3.org/2001/XMLSchema-instance</a>" xs:schemaLocation="<a href="http://drools.org/drools-5.0/change-set" target="_top" rel="nofollow" link="external">http://drools.org/drools-5.0/change-set</a> <a href="http://anonsvn.jboss.org/repos/labs/labs/jbossrules/tags/5.0.1.26597.FINAL/drools-api/src/main/resources/change-set.xsd" target="_top" rel="nofollow" link="external">http://anonsvn.jboss.org/repos/labs/labs/jbossrules/tags/5.0.1.26597.FINAL/drools-api/src/main/resources/change-set.xsd</a>"><br>
<add><br> <resource source="classpath:rules/rules.drl" type="DRL"><br> </resource><br> </add><br></change-set><br><br>So, again, following the bouncing ball:<br><ol>
<li>The resource adapter has a config file (META-INF/ra.xml) that tells it where its changeset is.</li><li>The changeset specifies potentially many URLs where .drl resources can be found. This is described in the Drools documentation.</li>
</ol>Supplied with the source code is META-INF/ra.xml and nothing else.<br><br>Best,<br>Laird<br><br><div class="gmail_quote">On Thu, Aug 26, 2010 at 4:30 PM, Andrew Waterman-2 [via Drools - Java Rules Engine] <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=1360589&i=0" target="_top" rel="nofollow">[hidden email]</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Many thanks, Laird. Although, I can't seem to find the "KnowledgeBases.xml" in the repository. Where should it be located? In drools-rar resources?<div><br></div><div>I just need the knowledge agent to check on a set of runtime changesets, and be able to update the embedded knowledgebase on change. Can I script a call into the RAR's configuration through JNDI and get the internal knowledge agent to do an "applyChangeSet"?</div>
<div><br></div><div>The user connection factory concept seems like a good way to go, if a bit of work.</div><div><br></div><div>best,</div><div><br></div><div>A</div><div><div><br><div><div class="im"><div>On Aug 26, 2010, at 3:15 PM, ljnelson wrote:</div>
<br></div><blockquote style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;" type="cite"><div class="im">
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.<br><br>See the <addResource> line in KnowledgeBases.xml.<br>
<br>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.).<br><br>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.<br>
<br>Short answer: no. :-) Longer answer: yeah, there should be a way to do that.<br><br>Best,<br>Laird<br><br></div><div><div></div><div class="h5"><div class="gmail_quote">On Thu, Aug 26, 2010 at 4:10 PM, Andrew Waterman-2 [via Drools - Java Rules Engine] <span dir="ltr"><<a href="#12ab017e7f30316c_" rel="nofollow" link="external" target="_top">[hidden email]</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;">
Just found the configuration in ra.xml:<div><br></div><div><div> <config-property></div><div> <config-property-name>changeSetResourceName</config-property-name></div><div> <config-property-type>java.lang.String</config-property-type></div>
<div> <config-property-value>rules/KnowledgeBases.xml</config-property-value></div><div> </config-property></div></div><div><br></div><div>Can I get it to support more than one changeSet? It would be nice to pass a list to monitor.</div>
<div><br></div><div>best,</div><div><br></div><div>A</div><div><div></div><div><div><br></div><div><div>On Aug 26, 2010, at 3:04 PM, Andrew Waterman wrote:</div><br><blockquote style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;" type="cite">
<div style="word-wrap: break-word;">Hey Laird,<div><br></div><div>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. :)</div>
<div><br></div><div>best wishes,</div><div><br></div><div>Andrew</div><div><br><div><div>On Aug 25, 2010, at 4:24 PM, Andrew Waterman wrote:</div><br><blockquote style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;" type="cite">
<div style="word-wrap: break-word;">Huge thanks!<div><br></div><div>best,</div><div><br></div><div>A</div><div><br><div><div>On Aug 25, 2010, at 12:55 PM, ljnelson wrote:</div><br><blockquote style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;" type="cite">
Have a look at <a href="http://code.google.com/p/drools-jca/" rel="nofollow" link="external" target="_blank">http://code.google.com/p/drools-jca/</a>.<br><br>This is not (clearly) released yet; have a look at the source and see what you think.<br>
<br>To build it: check it out, then, with Maven 2.2.1, run mvn clean install from the root.<br>
<br>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.<br>
<br>Best,<br>Laird<br><br><div class="gmail_quote">On Wed, Aug 25, 2010 at 1:39 PM, Andrew Waterman-2 [via Drools - Java Rules Engine] <span dir="ltr"><<a href="#12ab017e7f30316c_" rel="nofollow" link="external" target="_top">[hidden email]</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;">
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. :)
<br><br>best wishes,
<br><br>Andrew
<br><div><div></div><div><br><br>On Aug 24, 2010, at 9:50 PM, ljnelson wrote:
<br></div></div><div><div><div></div><div><div><div><div><div><div class='shrinkable-quote'><br>>
<br>> Hello; I've made a JCA resource adapter for Drools.
<br>>
<br>> I've had to hack quite a bit to get it so that the KnowledgeAgent- and
<br>> resource-scanning-related parts don't use Threads, but, instead, use the
<br>> JCA-supplied WorkManager and BootstrapContext#createTimer() for asynchronous
<br>> operations (like resource scanning and notifying).
<br>>
<br>> Here are some changes it would sure be nice to see, that I needed to hack
<br>> around in order to make it so that a KnowledgeAgent-produced KnowledgeBase
<br>> could be shared by Java EE components in a specification compliant manner:
<br>>
<br>> 1. ResourceChangeNotifierImpl#ProcessChangetSet is an inner class that is
<br>> marked as public static, but which has a package-protected constructor. I
<br>> have to create a new instance of this in order to create a
<br>> ResourceChangeNotifierImpl subclass that doesn't use threads. I hope this
<br>> constructor could be made public instead. Right now I'm calling
<br>> setAccessible(true). Yecch.
<br>>
<br>> 2. ResourceFactory#setFactoryService(): sure do wish this were public, or
<br>> that there were another way to install a ResourceFactoryService. I need to
<br>> do this so that the scanner and notifier are under my control (and don't use
<br>> Threads, but instead use Timers as provided by the JCA BootstrapContext
<br>> class). It appears that I do have some control here in Drools 5.1 with the
<br>> (undocumented) ServiceRegistry interface (how do I get an instance of it?
<br>> what does it do? is it used pervasively?), but I don't know, since it's
<br>> undocumented, whether it's the preferred way to do this sort of thing or
<br>> not.
<br>>
<br>> 3. All this indirection is really quite clunky, especially given the
<br>> META-INF/services facility. Was there a good reason this was not used? I'm
<br>> sure there was something, because having to consult a factory for a service
<br>> to get a provider to produce an instance of something is a bit much.
<br>>
<br>> Hacking around those limitations, I was able to produce a Drools resource
<br>> adapter that vends KnowledgeBase instances as its user connection factories.
<br>> This means to use it in a spec-compliant manner, you do this in your
<br>> stateless (or stateful) session bean:
<br>>
<br>> @Resource
<br>> private KnowledgeBase kb;
<br>>
<br>> ...and you get injected a wrapper KnowledgeBase that uses the Java EE
<br>> container's JCA machinery to invoke operations on the shared KnowledgeBase.
<br>>
<br>> Is this something that would be interesting to other people? If so I am
<br>> happy to open source it.
<br>>
<br>> Thanks for a great toolkit.
<br>>
<br>> Best,
</div></div></div>> Laird
<br>> --
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