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@lists.jboss.org [mailto:rules-dev-bounces@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@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-----
[mailto:rules-dev-bounces@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
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@lists.jboss.org
> [mailto:rules-dev-bounces@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@camunda.com
<mailto:bernd.ruecker@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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