Matching against regex failing?
by qwertyqwerty
Hi
in my decision table in the action column i want to validate a value against
a regex, and return the boolean back as a response. The condition i have
is:
eval($t.getTestVal() matches("[A-Z"))
The DRL that gets generated is:
eval($t.getTestVal() matches(\"[A-Z\")));
It seems to be adding the escape characters in which i don't want, and i
suspect is causing me my issue. The error coming out is:
Errors when compiling rules [19,0]: [ERR 102] Line 19:0 mismatched input ''
[19,0]: [ERR 102] Line 19:0 mismatched input '<eof>' in rule
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13 years, 8 months
BPMN 2.0 versioning
by Alberto R. Galdo
Hi,
As you may know, previous releases of JBPM had support for jPDL
processes versioning.
As per the deployment process, the process was serialized as Java
objects into the database as blobs once it was converted as such at
deployment time.
From that time on, every process in execution was linked to it's process
serialization ( the version that was active at that moment ) and subsequent
serializations of newer versions of the same process where versioned and
the new process instances keep track of what version of the process
definition they were linked to. That made very easy the task of updating
process definitions in an application just keeping in mind that previous
process instances will execute by the previous process definition and newer
process instances will follow the latest process definition version.
Now, in JBPM 5.x things don't seem to work that way anymore. Processes
are defined using BPMN 2.0, live in a Drools KnowledgeSession, and seems
there's no support for process definition versioning.
So, how would you solve the problem of having in the same
KnowledgeSession different versions of the same process ( each having it's
bag of process instances attached ) in JBPM 5.x ? Is it that even
possible?. We have a long time running application that has up to 7
different versions of a process and this really is a feature we need.
Seems that one solution would be to have different versions of the
process definition live in the knowledge session bound to different process
names and make your application aware of that when launching new instances
... but that seems more of a workaround ... Is this really the unique
solution for this?
Greets,
Alberto R. Galdo
argaldo(a)gmail.com
13 years, 8 months
regarding drools guvnor and eclipse IDE
by Sai Nadh
How can i access the rules (which i have created in Drools Guvnor) to my
java application?
plz give me some example....
i have tried with below code, is there any mistakes?? if yes pls mention....
private static KnowledgeBase createKnowledgeBase() {
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent"
);
KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
kaconf.setProperty( "drools.agent.scanDirectories", "false" );
kagent.applyChangeSet( ResourceFactory.newUrlResource("
http://localhost:8080/guvnor/rest/packages/ProductPositionAlert/assets/ch...")
);
return kbase;
}
my guvnor package sanpshot details are
[image: Inline image 2]
thanks in advance
--
*Regards*
* sainadh*
* *
13 years, 8 months
Task Handler blocking
by Alberto R. Galdo
Hi All,
We have an application where we are using JBPM for our processes. In our
application there's a strong requirement to maintain the same
KnowledgeSession between restarts even though that we are not using rules
at all, just BPMN 2.0 processes ( we are aware that JBPM needs it to
maintain process state, workitem state and so on ... but don't need
neither rules nor ReteOO loops in our app ).
Now we got to the tricky task handling part, were we have several
handlers that depend on I/O which blocks the entire execution of the
processes. And just because all our application depends on the *same*
shared stored knowledge session, all our other parallel processes that need
to execute processes are waiting ( like in a queue ) for the I/O to finish
and execute themselves whenever the execution of JBPM gets blocked by I/O.
We've tried to execute our handlers in different threads, but as we are
running inside a persisted environment JBPM looses the JTA transaction as
it is not bound to the current thread. Seems not a solution. We tried then
to implement thread communication mechanisms, yield() and notify() and just
made the problem worse.
Any insights on the subject? How can we execute parallel non-blocking
processes inside a shared and persisted KnowlegdeSession with JBPM?
Greets,
Alberto R. Galdo
argaldo(a)gmail.com
13 years, 8 months
Rete Tree node colors
by raffi
Hello,
after reading the documantation of the RETE algorithm here I have an
understanding problem.
I think the first step (after ReteNode) are the ObjectTypeNodes, colored in
blue in documentation. The view in eclipse shows me the red colored
AlphaNodes as first childs after the ReteNode. Afterwards there are the blue
colored ObjectTypeNodes. The number of these blue colored nodes corresponds
to the number of conditions for one type. That is why I ask about a possible
color changing.
Or do I have a generel misunderstanding there?
Greetings...
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13 years, 8 months
Rule not working with Change_set.xml
by anniejoseph
Hi,
I'm trying to use change-set.xml, which pionts to a drl file.My code is
try {
url =new URL("file:config/change-set.xml");
} catch (MalformedURLException e) {
e.printStackTrace();
}
kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent" );
kagent.applyChangeSet( ResourceFactory.newUrlResource( url ) );
kbase = kagent.getKnowledgeBase();
ksession= kbase.newStatefulKnowledgeSession();
sconf
=ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
sconf.setProperty( "drools.resource.scanner.interval", "10" );
ResourceFactory.getResourceChangeScannerService().configure( sconf );
ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();
ksession.insert(object);
ksession.fireAllRules();
and my change-set.xml is:-
<?xml version="1.0" encoding="UTF-8"?>
<change-set xmlns='http://drools.org/drools-5.0/change-set'
xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/...'
>
<add>
<resource source ='file:config/Rule.drl' type='DRL'
basicAuthentication='enabled' username='admin' password='admin'></resource>
</add>
</change-set>
This code worked without any exception, but the rule is not executing. I
tried without changeset.xml and rule worked properly.
What is wrong?
Thanks
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13 years, 8 months
Listening to changes on facts
by jspartan0901
Hello,
I am currently evaluating fusion for our project. We are planning to deploy
it on an application server.
When a rule is successfully executed. I need to generate an action such as
sending a message to a queue.
As per my understanding so far, when a rule matches conditions, we need to
insert a fact in the working memory and listen for changes in the java code.
Can anyone please share a piece of code on how to listen on changes to
facts?
Thanks!
Sam
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13 years, 8 months
