[rules-dev] Accessing JCR repository directly

Fri Mar 5 12:01:18 EST 2010

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 judge 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.com>
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.com>
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 should
> 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
<http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-guvnor/s
r%0d%0ac/main/java/org/drools/guvnor/server/files/>
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 something
> 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
>
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> --
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