Re: [rules-users] Rules storage without Guvnor?
On 2 Jun 2014, at 08:40, Péter Gergely, Horváth <h.peter(a)mailbox.hu> wrote:
Hello All,
We are evaluating Drools for our use case and would have a question for storing rules
files. We are in a relatively constrained environment, where getting Guvnor up and running
does not seems to be a valid option. Since we would only need the core repository
functionality so that we can separate rule deployment from application deployments (and
none of the advanced features like online editing etc), I think it would make more sense
to have a light-weight alternative for storing the rule files.
In 6.0 our rules are
stored in GIT, it doesn’t get much lighter than that
Our UI is easily customisable if you know how, as it’s all modular, and everything is a
plugin. So you can hide/disable the parts that you do not want available at run time,
although at the moment that requires a rebuild.
Being able to pick up rules from an NFS share of from a database CLOB field would be
perfectly sufficient for us. I have worked with JBPM4 quite a lot, where the core engine
contained support for versioned storage of the process definitions in the database itself
[1].
I don’t see how this would be better than GIT, and certainly a lot more
complicated and heavier.
Is there any similar feature in Drools, where the rules can be deployed to e.g. a
database or any other repository solution, (without using Guvnor)?
No, I don’t see
what value this would have (simply storing a clob). I could potentially see value in an
indexed/exploded rules stored in a DB for refactoring, x-reference, analysis work. But
this would be additional to the GIT storage, and not instead of.
I haven't found too much details on this topic, but for me it
seems that the only approach would be to have some custom logic, which programmatically
checks for rule updates and re-creates the whole knowledgebase on any update.
You
can use our Maven plugin for this with GIT. You can poll or add a GIT hook. You can look
into hudson for automating this. JGIT doesn’t expose hooks right now, so you’d need to
use your own GIT (which wouldn’t work with guvnor, although you can GIT-Mirror the two).
I am wondering whether there is any more sophisticated solution in
Drools where at least update checking/rule reconfiguration could be delegated to the
engine.
The best way would be to extend the maven plugin to provide this
functionality, but make sure it’s independent of maven too. If you do this right, we can
look at integrating it into the main Guvnor codebase.
Mark
Any inputs are appreciated.
Thanks,
Peter
[1] http://docs.jboss.com/jbpm/v4/javadocs/org/jbpm/api/RepositoryService.html
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