Rules and process variables...
by bob.breitling
How do you or, even, can you access process variables in rules?
I did this sort of thing in my rules consequences:
ProcessInstance pi = drools.getWorkingMemory().getProcessInstance(1);
((VariableScopeInstance)
pi.getContextInstance("VariableScope")).setVariable("x", x);
In my test, the process id of 1 is a bit of a kludge. Is there a good way
to find that id?
This looks pretty ugly.
Is the right way to do this to create a subprocess and map the variable into
the subprocesses' working memory as facts with <mapping> tags?
Bob
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15 years, 11 months
Drools and Unidata
by Dean Whisnant
Do you know of anyone using Drools with Unidata, Universe, or other Pick style database? I'm interested in sharing experiences.
Thank you!
Dean
15 years, 11 months
University of Texas Austin
by Mark Proctor
I'm looking for locations for the next USA based conference for
febuary (end of febuary).
http://blog.athico.com/2010/09/drools-boot-camps-2011-usa-and-emea.html
I figured most people want somewhere warm and Austin is centrally
located. I don't know about pricing but Austin University seems to have
nice conference facilities:
http://www.meetattexas.com/
If we do this around austin university it would be good if we could
double up organisation with the local logic based programming groups,
maybe a professor at Austin University wants to be actively involved? If
anyone has any ideas, please let me know :)
Mark
15 years, 11 months
WorkingMemoryEntryPoint NullpointerException?
by Aman
memoryEntryPoint is retrieved as null, what could be wrong here or do I need
to do some special configuration in order to use working memory point
streams?
StatefulKnowledgeSession knowledgeSession =
GivemeStatelessOrStateful
.getStatefull("cashflow.drl");
WorkingMemoryEntryPoint memoryEntryPoint = knowledgeSession
.getWorkingMemoryEntryPoint("TransactionStream");
15 years, 11 months
Re: [rules-users] WorkingMemoryEntryPoint NullpointerException?
by Aman
I got it, I have to use Entrypoint in my DRL file otherwise it would give
null pointer exception.
I used like this-
rule "Testing EntryPoint"
when
$cf : CashFlow() from entry-point "TransactionStream"
then
System.out.println($cf);
System.out.println("Testing the transaction stream");
end
From: Aman [mailto:boy18nj@gmail.com]
Sent: Sunday, October 03, 2010 9:42 PM
To: 'Rules Users List'
Subject: WorkingMemoryEntryPoint NullpointerException?
memoryEntryPoint is retrieved as null, what could be wrong here or do I need
to do some special configuration in order to use working memory point
streams?
StatefulKnowledgeSession knowledgeSession =
GivemeStatelessOrStateful
.getStatefull("cashflow.drl");
WorkingMemoryEntryPoint memoryEntryPoint = knowledgeSession
.getWorkingMemoryEntryPoint("TransactionStream");
15 years, 11 months
calling a function from the facts model
by Nadav Hashimshony
Hi.
After importing the fact model to guvnor i open try to create a new rule.
in the left side i see the fact model, i click the "+" and get all the
members of the fact class (all my members are public).
my question is, why cant i see the methods of the facts class?
i want to use a method that receives a parameter and returns an answer, then
check that answer in the rule and do something accordingly.
example:
currently my rule look like
rule "Rule-04"
salience 100
activation-group "mygrp"
no-loop true
when
d : myFacts( isOne == "false", isTwo == "true", hasThree == "true")
then
System.out.println("Rule 04 activated");
d.someMethodDone();
i want it to be something like:
when
d : myFacts( isOne == "false", isTwo == "true", hasNumber("three")
== "true")
then
System.out.println("Rule 04 activated");
d.someMethodDone();
i want hasNumber to be a function i give a parameter too and check it return
how can this be done?
Thanks.
Nadav.
15 years, 11 months
Re: [rules-users] fireUntilHalt and timing of rule activations
by Greg Barton
Nope, you're not missing anything. What you need is a control object of some sort thst's inserted after all of the "real" data is inserted. (See attached project for an example.) Rules will look like this, if the control object is called BatchLatch and data objects A:
rule "CountAs"
dialect "java"
salience -1
when
l : Latch()
a : A( latch == l )
then
retract(a);
l.incACount();
System.out.println("Found an A in " + bl);
end
Note that the A object being processed is tied back to the latch. This is so multiple latches can be processed simultaneously and their processing won't be intermingled. This is necessary because there's no guarantee that two Latch objects aren't in working memory at once. (Though you could create a rule that enforces this.)
GreG
--- On Sat, 10/2/10, Norman C <rent_my_time(a)yahoo.com> wrote:
> From: Norman C <rent_my_time(a)yahoo.com>
> Subject: [rules-users] fireUntilHalt and timing of rule activations
> To: rules-users(a)lists.jboss.org
> Date: Saturday, October 2, 2010, 10:22 AM
> Hi All,
>
> In my app, I have a separate thread calling fireUntilHalt()
> continuously. I
> have quite a few rules, and I am using salience extensively
> to control the order
>
> in which rules are executed. What I have seen (by adding
> an event listener) is
> that as a new fact is inserted, various rules are
> activated. Often, the
> fireUntilHalt will start executing fireNextItem in
> DefaultAgenda before all of
> the activations are complete. So if the rule with the
> highest salience
> value hasn't been activated at this point, then the first
> rule to be fired isn't
>
> the correct one.
>
> This can be worked around by waiting for insert to return
> and then calling
> fireAllRules(). But it seems like the session should
> block fireUntilHalt from
> trying to execute activated rules until all activations are
> complete. Or am I
> missing something here?
>
> thanks,
> Norman
>
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
15 years, 11 months
Download CREDIT DEBIT example-
by Aman
Currently I am reading this drools expert documentation, I came across this
example-
Where can I download this example?
rule "increase balance for credits"
when
ap : AccountPeriod()
acc : Account( $accountNo : accountNo )
CashFlow( type == CREDIT,
accountNo == $accountNo,
date >= ap.start && <= ap.end,
$amount : amount )
then
acc.balance += $amount;
end
rule "decrease balance for debits"
when
ap : AccountPeriod()
acc : Account( $accountNo : accountNo )
CashFlow( type == DEBIT,
accountNo == $accountNo,
date >= ap.start && <= ap.end,
$amount : amount )
then
acc.balance -= $amount;
end
15 years, 11 months
fireUntilHalt and timing of rule activations
by Norman C
Hi All,
In my app, I have a separate thread calling fireUntilHalt() continuously. I
have quite a few rules, and I am using salience extensively to control the order
in which rules are executed. What I have seen (by adding an event listener) is
that as a new fact is inserted, various rules are activated. Often, the
fireUntilHalt will start executing fireNextItem in DefaultAgenda before all of
the activations are complete. So if the rule with the highest salience
value hasn't been activated at this point, then the first rule to be fired isn't
the correct one.
This can be worked around by waiting for insert to return and then calling
fireAllRules(). But it seems like the session should block fireUntilHalt from
trying to execute activated rules until all activations are complete. Or am I
missing something here?
thanks,
Norman
15 years, 11 months
