[rules-dev] Accessing JCR repository directly

Wed Mar 3 04:11:40 EST 2010

Hi Michael.

Drools could provide an EJB3 Interface for Remoting for the
ServiceImplementation. Then you only need some client jar in the other
app. That would be really easy to use :-)

Okay, I will just wait what will happen in that area, so for our current
project we need another (read: hacky) solution. But for the long run I see
a big value in having a good Interface there, to integrate it in other
environments and apps

Cheers

Bernd

Von: rules-dev-bounces at lists.jboss.org
[mailto:rules-dev-bounces at lists.jboss.org] Im Auftrag von Michael Neale
Gesendet: Mittwoch, 3. März 2010 04:22
An: Rules Dev List
Betreff: Re: [rules-dev] Accessing JCR repository directly

well no matter what the solution, it will always be "remoting" - the only
way to not have this would be to unpack the guvnor war, and add in your
app mixed in with all the classes etc (messy) - then it would be in the
same app/process as Guvnor and you could access it in memory.

Other than that, it will be remove (even if on the same machine - unless
we have some kind of JCR/JNDI thing which I don't know would do it).

As for what there is now: yes webdav would be it. Making
ServiceImplementation remotable would take a bit of work, yes.

On Mon, Mar 1, 2010 at 10:04 PM, Bernd Rücker <bernd.ruecker at camunda.com>
wrote:

By the way: ServiceImplementation doesn’t have to be remote in the first
step. If I can access is (without having a Seam application) locally via
Java that would be already a good start and makes it easy to create en EJB
out of it

Von: rules-dev-bounces at lists.jboss.org
[mailto:rules-dev-bounces at lists.jboss.org] Im Auftrag von Bernd Rücker
Gesendet: Montag, 1. März 2010 09:29

An: 'Rules Dev List'
Betreff: Re: [rules-dev] Accessing JCR repository directly

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

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>
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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