Hi,
Yes the patch detects which version and upgrades on the fly (Abrakadabra
magic ;-)).
There is a system parameter (“drools.ruleflow.port”). The
code checks for version only when the system parameter is set to true. This was
added so that there is no overhead (CPU time) for users who are using rule
flows in 5.0 only. Users using the old rule flows in 5.0 and want upgrade must set
this parameter to “true”.
Main file to be checked for changes is src/main/java/org/drools/compiler/ProcessBuilder.java.
The other files are related to cleanup (format as well as code) or test cases.
Modifying ProcessBuilder was easier / cleaner to control the upgrade
of rule flows instead of ProcessReader. If you feel otherwise then let me know and
I will modify it.
If you feel more test cases should be added to make this more
sturdy then let me know which ones and I can submit the same too.
Thanks.
Regards,
- Nimesh
From: rules-dev-bounces@lists.jboss.org
[mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mark Proctor
Sent: Thursday, October 30, 2008 7:47 PM
To: Rules Dev List
Subject: Re: [rules-dev] RE: [rules-users] Compatibility of Rule Flows
from 4.0.7 to 5.0.0
Nimesh Muley wrote:
Oh ok. I developed it because you mentioned whether it would be
possible to plug it in package reader.
I think we can close this JIRA as invalid.
The
code handles the migration right, does it already hook into the package reader?
I wasn't sure, as i haven't read the code yet. Are you saying the patch will
detect which version of the XML it is, and upgrade on the fly?
My assumption was that it was just some code to migrate from 4 to 5, but
someone still needs to execute that, so it seemed the easiest route was to do
this via an eclipse option for now - as hooking into packagebuilder with auto
detection was more work and needed more testing, but if you have done this
already....
In case there is a change of mind later on we already have a patch
for it ;-).
see
above.
Thanks.
Regards,
- Nimesh
From: rules-dev-bounces@lists.jboss.org
[mailto:rules-dev-bounces@lists.jboss.org]
On Behalf Of Mark Proctor
Sent: Thursday, October 30, 2008 5:10 PM
To: Rules Dev List
Subject: Re: [rules-dev] RE: [rules-users] Compatibility of Rule Flows
from 4.0.7 to 5.0.0
Nimesh Muley wrote:
Hi,
I have raised a feature request for this https://jira.jboss.org/jira/browse/JBRULES-1797
and also submitted a patch (JBRULES-1797.patch.zip) for the same. If there are
any changes in the patch kindly let me know.
I
believe kris is going to add a feature to eclipse where you can select a
ruleflow for it to convert, don't think we are going to go for auto-detection
and conversion on the fly with the packagebuilder.
Mark
Thanks.
Regards,
- Nimesh
From: rules-dev-bounces@lists.jboss.org
[mailto:rules-dev-bounces@lists.jboss.org]
On Behalf Of Nimesh Muley
Sent: Monday, October 06, 2008 10:08 AM
To: 'rules-dev@lists.jboss.org'
Subject: [rules-dev] RE: [rules-users] Compatibility of Rule Flows from
4.0.7 to 5.0.0
Hi,
By going through the code it seems possible to achieve this by
modifying ProcessBuilder.addProcessFromFile. Easiest check would be to see
whether the XML contains element called as “process”. Since XML
Parsing is internal to the individual releases (4.0 uses XStream and 5.0 uses
XMLReader), I am not sure whether we should form a XML document from the reader
to check if the process belongs to version 4.0 or compliant.
Brute force check would be indexOf (“<process”)
>= 0 then it is 5.0 else 4.0 ;-). I am sure there would be better ways than
this kind of check.
I do not mind taking this further. Due to lack of in depth
knowledge about drools, I am not able to decide what the approach should be for
checking the version.
This would be a really good feature as it would mean that drools
5.0 is backward compliant for rule flows J. And this adds lot of
confidence to enterprises.
p.s. Since this was now moving towards dev, I have moved the thread
to the dev mailing list.
Thanks.
Regards,
- Nimesh
From: rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org]
On Behalf Of Mark Proctor
Sent: Saturday, October 04, 2008 9:37 PM
To: Rules Users List
Subject: Re: [rules-users] Compatibility of Rule Flows from 4.0.7 to
5.0.0
You are a star, that saves us a lot of work :) I'm wondering
if we can work this into the package reader and some how have it detect whether
something is version 4 or 5 and convert first if it's 4, fancy having a look
and seeing if that's possible?
Mark
Nimesh Muley wrote:
Hi,
I have attached a file for translating rule flows from 4.0 to 5.0.
I have tested my flows with the XSL and it works fine. However, the XSLT may
not be quite slick or compact as I have touched upon XSLT after a long time. I
have covered all the nodes available (ruleSet, start, end, join, split,
milestone, action and subProcess).
There is one issue in the XSLT. I have not added the xmlns
attribute to the process element. Reason is that this attribute appears in
child nodes too with empty string, even though it is not mentioned for the
child nodes. This attribute is needed in the ‘process’ node because
the Eclipse editor for 5.0 ignores the process node if there are more than 2
sub processes in that ruleflow. Am not sure why this is happening but that has
been my observation.
In case XSLT is not present as an attachment then let me know the
location where it can be uploaded.
Thanks.
Regards,
- Nimesh
From: rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org]
On Behalf Of Mark Proctor
Sent: Tuesday, September 30, 2008 7:26 PM
To: Rules Users List
Subject: Re: [rules-users] Compatibility of Rule Flows from 4.0.7 to
5.0.0
No they are not compatible, 5.0 has a new ePDL XML language
that is human writable. I suggest that somone in the community starts looking
into an XSLT to translate them.
Mark
Vikrant Yagnick wrote:
Hi All,
I wanted to know if RuleFlows made using the Eclipse 4.0.7
RuleFlow Builder will work with 5.0.0. When, I try to upload a 4.0.7 ruleflow
into Guvnor, I get a NullPointerException and before that the following:
Cannot find the declaration of element
'org.drools.ruleflow.core.impl.RuleFlowProcessImpl'.
I checked the 5.0.0M1 jars for drools-core, and this class
seems to have been removed from there. Also, after installing the 5.0.0 plug-in
into Eclipse, my rule-flow nodes have all gone.
Also, this may be a minor bug but it says(both in the docs
and the BRMS Guvnor M1 Release):
“Ruleflows
allow flow control between rules. The eclipse plugin provides a graphical
editor. Upload ruleflow .rf files for
inclusion in this package.”:
Should the .rf say .rfm ?
Cheers,
Vikrant
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