JBPM processes in Guvnor
by DonC
Hi,
I'm pretty new to guvnor and jbpm. I have guvnor 5.2.0 final running, I'm
trying to extract the processes attached to a package using the
KnowledgeAgent api. I've successfully managed to create a process under the
mortgages package, however when I build a snapshot of the package the
processes do not show.
When I use eclipse to view the repository I can see my process in the
snapshot. When I'm in java using the knowledgeAgent, I can not get the
process out. How am I able to extract the process and execute it?
String url =
"http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/mort...";
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newUrlResource( url ), ResourceType.PKG );
assert(kbuilder.hasErrors());
Collection<KnowledgePackage> packageList = kbuilder.getKnowledgePackages();
for (KnowledgePackage kp : packageList) {
System.out.println("package name = " + kp.getName());
Collection<Process> processList = kp.getProcesses();
for (Process p : processList) {
System.out.println(p.getName());
}
}
the size of processList is always 0?
Any help will be appreciated.
Thanks
Don
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14 years, 8 months
Fusion confusion
by Chris Richmond
I have attached my program project with my main FusionMain.java and two
small classes and my rule file Sample.drl.
It's a zip file i have modified to be .piz for mail server reasons.
In the Main I set up and run as STREAM mode session and execute on a
background thread .fireUntilHalt().
Then I inject two objects(DataReading and ConfigEvent)
The Sample.drl rule has the rules:
declare DataReading
@role( event )
end
declare ConfigEvent
@role( event )
end
rule "Detect high data reading"
when
$dr: DataReading(reading > 10.0) from entry-point "My Stream"
then
System.err.println("Data reading > 10");
end
rule "Wait for follup config"
lock-on-active
when
$dr: DataReading(reading > 10.0) from entry-point "My Stream"
not($de: ConfigEvent(this after[0s,10s] $dr))
then
System.err.println("Action");
end
rule "Detect config event"
when
$ce: ConfigEvent() from entry-point "My Stream"
then
System.err.println("Config Event");
end
What I expect is that I would see the DataReading rule fire right
away(it does)
then 5 seconds later when I insert the ConfigEvent I would see it's rule
fire(it does)
But the "Wait for follup config" rule fires no matter what.
To me, that rule should wait and make sure no ConfigEvent object was
inserted within 10 seconds after the DataReading object, but no matter
what that rule fires after 10 seconds. How can I make my inserted
ConfigEvent(inserted within the 10 seconds) satisfy that condition so it
cancels that rule from firing? I am using the latest download from the
site (5.2.0 final) binaries.
Does Fusion in fact work or am I doing something wrong? The zip file
has the entire runnable program and project(have to modify lib
references to point to correct Drools 5.2 binaries).
If the zip file does not come through I will attach the files
individually next.
Thanks,
Chris
14 years, 8 months
Re: [rules-users] How to reuse a result of a rule in an other rule
by mjohansen
Basically, you can either update an object with the results of the first
rule, or create a new object.
Like:
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$person.setHungry(true);
update($person);
end
rule "Food"
when
$person : Person(hungry==true)
then
$person.lookForFood()
end
or
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$hungry=new Hungry();
$hungry.setPerson($person);
insert($hungry);
end
rule "Food"
when
$person : Person()
$hungry : Hungry(person==$person)
then
$person.lookForFood()
end
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14 years, 8 months
temporal operator "includes" not working
by Neelesh Deo Dani
Hi,
I've following event declarations and rule:
declare Event
@role(event)
@timestamp(datetime)
datetime : Date
name : String
end
declare Contest
@role(event)
@timestamp (startTimestamp)
startTimestamp : Date
endTimestamp : Date
end
rule "Contest"
no-loop
when
$e : Event(name == "event1")
$contest : Contest(this includes $e)
then
System.out.println("rule Contest fired");
end
The timestamps with Event and Contest objects are set as follows (before insert in state-full session):
// for Contest object
Calendar c = Calendar.getInstance();
c.set(2011, 7, 1);
contestType.set(contest, "startTimestamp", new Date(c.getTimeInMillis()));
c.set(2011, 7, 31);
contestType.set(contest, "endTimestamp", new Date(c.getTimeInMillis()));
// for Event object
c.set(2011, 7, 3);
eventType.set(event, "datetime", new Date(c.getTimeInMillis()));
The condition "this includes $e" in LHS doesn't get evaluated to true and RHS doesn't get executed.
If I change it to "$contest.startTimestamp before $e,
$contest.endTimestamp after $e" which has the same meaning then it
works fine.
Please help in resolving the issue.
Thanks & Regards,
Neelesh
14 years, 8 months
accumlator and BigDecimal
by mjohansen
I'm trying to create an accumulator to sum a BigDecimal. Here's what I wrote:
$upcharge : BigDecimal( )
from accumulate( GroupUpcharges( row>$gb.row && row<=$gu.row, $value :
upcharge),
init( BigDecimal total = BigDecimal.ZERO; ),
action( total=total.add($value); ),
reverse( total=total.subtract($value); ),
result( total ) )
$gb and $gu are set earlier in the WHEN clause.
When I run this, it compiles successfully, but then flows up at run time
with a null pointer exception. What am I doing wrong?
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14 years, 8 months
match longest matching Long in WM
by esstrata
Hi,
I hope you can help me out here with a way to implement this rule:
1) I have String WM
2) I have beans in WM with a property called 'code'
public class MyBean {
private String code;
...
3) I want a rule of the type "Process MyBean with the longest-matching,
not-null code"
Let explain myself a little further with an example.
I have the following MyBean objects in WM with the given code properties:
MyBean [code = 44]
MyBean [code = 443]
MyBean [code = 4432]
MyBean [code = 36]
MyBean [code = 7]
What I want to get is a rule where the following samples would assign to a
variable the given results shown:
4411111 gives MyBean [code = 44]
4433333 gives MyBean [code = 443]
22222 gives null
I think the rule could start like:
rule "Process MyBean with the longest-matching, not-null code"
dialect "mvel"
when
$s : String()
$m : MyBean($s matches /the longest not-null possible MyBean.code/)
then
......
Thank you
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14 years, 8 months
Using functions to derive values in "accumulate" (LHS)
by Christian Heupel
Hello,
I am trying to write a rule for my drools engine. It is (as far as i get it
right), almost a total standard rule, however I'm having troubles with it
and was hoping you could point me into the right direction (as i was
surprised to see no similar question, I hope it is not too basic).
To give you an understanding of what i want to do: I want to calculate a
number of costs a person had on a series of trips. For each trip, a function
getCost() calculates the total amount of money spent (such as hotel, bar,
...). If the total amount of money spent is higher then the person's maximum
money, we take action. I am trying to use the accumulate function, but it
seems as if I'm not able to call the getCost() function there. The rule
looks like this:
-----------------
rule "Total Costs"
when
$person : Person( eval ($person.maxMoney != null ) )
$totalCost : Number()
from accumulate( $trip : Trip( $cost : $trip.getCost() )
from $person.getTrips(),
sum( $cost )
)
then
// take action
end
-------------------
I have tried it with and without the $trip-variable (since I thought I might
have to use it to call its function).
The error I get looks like this:
Error INTERNAL_ERROR: Error: unknown:70:54 Unexpected token ')'
java.lang.Exception: Error: unknown:70:54 Unexpected token ')'
at
com.fluidops.coremgmt.ruleengine.PolicyTask.readRule(PolicyTask.java:489)
at
com.fluidops.coremgmt.ruleengine.PolicyTask.readRule(PolicyTask.java:419)
I would be very thankful if one of you could help me out here :)
Best regards,
Christian
PS: I already had this question in the drools forum, it was, however not
forwarded to this mailing list, so please forgive me if it is a double post.
14 years, 8 months
Problem with running examples from drools-distribution-5.2.0
by Scholz. Ulrich
Dear all,
I try to run the examples given in http://download.jboss.org/drools/release/5.2.0.Final/drools-distribution-... (Drools 5.2.0 final downloads)
I've installed the plugin and the example as given in ReadMeDrools.txt
Nevertheless, I get many Eclipse errors (1913) and cannot run the example. For example, the first error is
Description Resource Path Location Type
[ERR 102] Line 56:49 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample" PetStore.drl /drools-examples/src/main/resources/org/drools/examples/petstore line 56 Drools Error
If I run the example despite the errors, I get the message "Could not find the main class: org.drools.examples.DroosExamplesApp. Program will exit."
What could I do?
Thanks, Ulrich
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Eclipse Java EE IDE for Web Developers.
Version: Indigo Release
Build id: 20110615-0604
(c) Copyright Eclipse contributors and others 2005, 2011. All rights reserved.
Visit http://www.eclipse.org/webtools
--
Graphical Editing Framework GEF 3.7.0.v20110425-2050-777D-81B2Bz0685C3A6E34272 org.eclipse.gef.feature.group Eclipse Modeling Project
Graphical Editing Framework Draw2d 3.7.0.v20110425-2050-46-7w3122153603161 org.eclipse.draw2d.feature.group Eclipse Modeling Project
JBoss Drools Core 5.2.0.v20110116-0638-H14 org.drools.eclipse.feature.feature.group JBoss by Red Hat
JBoss Drools Guvnor 5.2.0.v20110116-0638-H14 org.guvnor.tools.feature.feature.group JBoss by Red Hat
JBoss Drools Task 5.2.0.v20110116-0638-H14 org.drools.eclipse.task.feature.feature.group JBoss by Red Hat
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14 years, 8 months
Globals from functions...
by bob.breitling
I have a global defined and I am trying to use it from a function. When my
rule gets loaded into my knowledge base, I always get an error complaining
about the global not being resolved.
---- simplified snippet ----
global int x;
function void foo(int n) {
x = n;
}
------------------------------
I get this kind of error "Function Compilation error: foo (line:20) x can
not resolved".
Should this work?
TIA,
Bob
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14 years, 8 months
