Re: [rules-users] Drools and Java EE

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]> 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 > > -- > > View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-and-Java-EE-tp... > > > Sent from the Drools - User mailing list archive at Nabble.com. > > _______________________________________________ > > rules-users mailing list > > [hidden email] > > https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > [hidden email] > https://lists.jboss.org/mailman/listinfo/rules-users > > > View message @ http://drools-java-rules-engine.46999.n3.nabble.com/Drools-and-Java-EE-tp... > To unsubscribe from Drools and Java EE, click here. > > > > View this message in context: Re: Drools and Java EE > 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users