[rules-dev] Accessing JCR repository directly

Michael Neale michael.neale at gmail.com
Sat Mar 6 18:47:05 EST 2010 

Right - that is touching on the more generic "service repository"  
which is kind of orthogonal to guvnor (even if they share some common  
parts).

In terms of rules specifics, the right idea is to have a good API  
(possibly remote) for people to build on in any case.

Hving access to the jcr bits may make sense, but the contents of te  
nodes may be opaque unless you use the guvnor API.



Sent from my phone.

On 06/03/2010, at 4:01 AM, Bernd Rücker <bernd.ruecker at camunda.com>  
wrote:

> Okay, and what is the situation now? Waiting for the perfect world ;-)
>
>
>
> Or maybe having something on top to be dependent on the app server?  
> Or move that part to the ESB integration?
>
>
>
> I think especially in the Repository, this is an enterprise feature  
> where all these questions get more interesting (than with the “plain 
> ” rule engine which is more easily embeddable). Actually I cannot ju 
> dge the philosophy of Drools Guvnor and the connection to SOA-P here 
> , but from my personal point of view a good integration in the JBoss 
>  AS and EJB3 world would be really nice. Maybe this could be on top  
> and the Guvnor core could still be deployable on other environments?
>
>
>
> Von: rules-dev-bounces at lists.jboss.org [mailto:rules-dev- 
> bounces at lists.jboss.org] Im Auftrag von Michael Neale
> Gesendet: Donnerstag, 4. März 2010 23:12
> An: Rules Dev List
> Betreff: Re: [rules-dev] Accessing JCR repository directly
>
>
>
> yes that was exactly my point. at that time we weren't prepared or  
> willing to create app specific wars/sars. In a perfect world the war  
> would work in all containers (that isn't really possible it seems)  
> but also be able to work in non EE containers (that may be a JNDI  
> issue? eg with jetty can be a hassle).
>
> On Fri, Mar 5, 2010 at 8:16 AM, Bernd Rücker <bernd.ruecker at camunda.co 
> m> wrote:
>
> I think JNDI Deployment always require an application server (or  
> not?). For JBoss the best way would be to provider a sar… But from a 
>  war you could register it manually as well I think, but this could  
> get app server specific…
>
>
>
> Von: rules-dev-bounces at lists.jboss.org [mailto:rules-dev- 
> bounces at lists.jboss.org] Im Auftrag von Michael Neale
> Gesendet: Donnerstag, 4. März 2010 04:35
>
>
> An: Rules Dev List
> Betreff: Re: [rules-dev] Accessing JCR repository directly
>
>
>
> right yes - the JNDI binding of JCR would make sense - but I wasn't  
> sure how that could be delivered as a self contained war to "drop  
> in" and not require significant container specific integration  
> (correct me if wrong).
>
> On Wed, Mar 3, 2010 at 8:08 PM, Bernd Rücker <bernd.ruecker at camunda.co 
> m> wrote:
>
> Hmm, okay REST is one option. But I still would prefer to bind the JCR
> Repository in the JNDI (which is easily possible). This is an option  
> we
> used already a couple of times for JackRabbit applications. By doing  
> so,
> everybody in the app server can access it via JNDI, like any other
> datasource as well (and basically that's what a JCR Repository is).
>
> The only dependency is to have JCR on the classpath, ok.
>
> I think for the moment I will create a Servlet which reads it from  
> Seam
> and binds the Repository to JNDI. What do you think?
>
> Having a REST or Webdav API INSIDE of the Appserver to talk from  
> Java to
> Java just sounds technically unnecessary complicated to me...
>
> -----Ursprüngliche Nachricht-----
>
> Von: rules-dev-bounces at lists.jboss.org
>
> [mailto:rules-dev-bounces at lists.jboss.org] Im Auftrag von Jervis Liu
> Gesendet: Mittwoch, 3. März 2010 08:55
>
> An: Rules Dev List
> Betreff: Re: [rules-dev] Accessing JCR repository directly
>
> Bernd Rücker wrote:
> >
> > Hi Michael.
> >
> > Thanks for the quick answer!
> >
> > Our use case at the moment is, that we maintain the HEAD version of
> > the rules in an own table locally in the app, where we have a
> > specialized GUI for authoring. As soon as they get released we
> > leveraged the RuleTemplate to generate a DRL file, which we want to
> > check in Guvnor, from where the deployment snapshots are created,
> > versioned and so on. So we have to access Guvnor programmatically
> > (doesn’t have to be JCR).
> >
> > A second nice use case we face is to hang in the Drools Repository
> > into a bigger JCR-Content-Tree (in the area of ModeShape), so there
> > JCR would be nice. Then we could use the JCR Explorer, written from
> > one of my colleagues, to have a look at the repos as well. But okay,
> > this is why we want to use JCR.
> >
> > But the most important issue is to access the Repository
> > programmatically from an EJB3. Maybe we could get around  
> classloading
> > isolation and just access some static stuff for that. Or making the
> > ServiceImplementation really more generic usable, that would be
> > wonderful as well. But as it sounds it will take some time and will
> > not be released pretty soon? Then we have to find another way for  
> now,
> > since if avoidable I don’t want to patch drools. So you mean I sho 
> uld
> > use the internal Remote Interface the GWT GUI is using? Where can I
> > find that and how can I create a correct reference?
> >
> > Or I have to use Webdav, but this looks pretty cumberstone to use it
> > internally in one JBoss server instead of pure Java mechanisms?
> >
> > Thanks and cheers
> >
> > Bernd
> >
>
> Hi Bernd, this might be related:
> *http://lists.jboss.org/pipermail/rules-users/2009-December/ 
> 011618.html
>
> *Basically the idea is that you expose ServiceImplementation as a  
> remote
> service. As far as how the remote service is implemented, one way to  
> go
> is to expose ServiceImplementation as RESTful service. Guvnor already
> has some Atom/Pub capabilities.It may not match your request yet,  
> but if
> you have a concrete requirement on what methods in  
> ServiceImplementation
> you want to expose remotely, we can look into it and get it addressed
> either by extending Atom/Pub capabilities that Guvnor already has (for
> this, take a look at
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-guvnor/sr
> c/main/java/org/drools/guvnor/server/files/)
> or by providing a truly RESTful service layer on top of Guvnor server.
>
> Cheers,
> Jervis
> >
> > *Von:* rules-dev-bounces at lists.jboss.org
> > [mailto:rules-dev-bounces at lists.jboss.org] *Im Auftrag von *Michael
> Neale
> > *Gesendet:* Montag, 1. März 2010 00:27
> > *An:* Rules Dev List
> > *Betreff:* Re: [rules-dev] Accessing JCR repository directly
> >
> > Hi Bernd. yes you have it correctly - seam starts things up.
> >
> > IN terms of accessing JCR directly, this came up before and one idea
> > was to use the "remote" JCR interface - that means some  
> refactoring I
> > guess.
> >
> > So the basic design is that there is a JCR server that starts up,  
> and
> > the "clients" connect remotely (a client in this case is also the
> > Guvnor server side).
> >
> > That way you can access it from multiple places. However, it may  
> be a
> > bit too low level for this - the question is what do you want to
> > access JCR for from your external app?
> >
> > A better approach, is to make the ServiceImplementation a true  
> remote
> > interface (at the moment it is, but for GWT clients only) - so ANY
> > sort of client can connect and access the guvnor services, without
> > messing with low level data structures - I am thinking the latter is
> > the superior approach (and someone else was looking at it).
> >
> > Michael.
> >
> > On Sun, Feb 28, 2010 at 4:53 AM, Bernd Rücker
> > <bernd.ruecker at camunda.com <mailto:bernd.ruecker at camunda.com>>  
> wrote:
> >
> > Hey guys.
> >
> > I thought I better ask that question on the dev list, correct me if
> > that was a bad choice ;-)
> >
> > I want to programmatically access the JCR repository from another
> > application (basically to author rules). I understood the
> > RulesRepository (which is a nice interface by the way). I tried to
> > understand how the JCR Session is created and can be accessed. As  
> far
> > as I found it, it seems that a Seam Bean just starts everything
> > (RulesRepositoryManager). Now the question is: How can I access this
> > from another application? Because the workspace is locked, I cannot
> > create another Session from there.
> >
> > Wouldn’t it be nice to bind the stuff in JNDI correctly or somethi 
> ng
> > like that? Or if I do that, can I inject it into the Seam  
> application?
> > Or maybe I can access the seam bean somehow from external?
> >
> > I think it would be the easiest and best to access the JCR repos
> > instead of using WebDav or whatever if I am in another EJB3  
> application…
> >
> > Thanks a lot for any hint
> >
> > Cheers
> >
> > Bernd
> >
> > --
> >
> > Blog: _www.bpm-guide.de <http://www.bpm-guide.de>_
> >
> > ---------------------------------------------
> >
> > camunda services GmbH - The Business Process Company
> >
> > Zossener Straße 55-58 - 10961 Berlin
> >
> > www.camunda.com <http://www.camunda.com> - info at camunda.com
> > <mailto:info at camunda.com>
> >
> > ---------------------------------------------
> >
> > Bernd Rücker
> >
> > Geschäftsführer
> >
> > Telefon +49 30 664040 901
> >
> > Mobil +49 171 1473461
> >
> > bernd.ruecker at camunda.com <mailto:bernd.ruecker at camunda.com>
> >
> > ---------------------------------------------
> >
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> >
> > ---------------------------------------------
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> >
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> >
> >
> > _______________________________________________
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> > https://lists.jboss.org/mailman/listinfo/rules-dev
> >
> >
> >
> >
> > --
> > Michael D Neale
> > home: www.michaelneale.net <http://www.michaelneale.net>
> > blog: michaelneale.blogspot.com <http://michaelneale.blogspot.com>
> >
> >  
> --- 
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> -- 
> Michael D Neale
> home: www.michaelneale.net
> blog: michaelneale.blogspot.com
>
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> blog: michaelneale.blogspot.com
>
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