To access at the fact object
by Mister Nono
Hi,
I have the drools rule (made in guvnor server) :
1. | rule "driverRule"
2. | salience 10
3. | dialect "mvel"
4. | when
5. | Driver( driverAge : age > 18 && < 65 )
6. | then
7. | Driver fact0 = new Driver();
8. | fact0.setName( "TOTO" );
9. | insert( fact0 );
10. | end
... and the java code source :
KnowledgeAgent agent =
KnowledgeAgentFactory.newKnowledgeAgent("/Guvnor.properties");
KnowledgeBase ruleBase = agent.getKnowledgeBase();
StatefulKnowledgeSession workingMemory =
ruleBase.newStatefulKnowledgeSession();
Driver d = new Driver("Jack", 28, null);
workingMemory.insert(d);
workingMemory.fireAllRules();
for(Iterator i = workingMemory.getObjects().iterator(); i.hasNext();)
{
Object obj = i.next();
System.out.println(obj.getClass().getCanonicalName());
if (obj instanceof Driver)
{
System.out.println("Driver name => " + ((Driver)obj).getName());
System.out.println("Driver age => " + ((Driver)obj).getAge());
}
}
But the drools rule changes the driver name "Jack" by "TOTO", but in the
console the initial name "Jack" is always displayed.
How to access at the objet who is in knowledge base (the modified objet) ?
Thank. ;)
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11 years, 4 months
Different results with same fact base
by raffi
Hi,
I have a strange behavior with the Drools Expert 5.5.0. After running the
main class few times in a row, the results suddenly differ from the ones
before it. That means there are somtimes 3, 4 or 5 results shown in console.
I am using a statefulknowledgesession. Inserting of all facts is done with
normal java lists. For my last type of facts I insert one, call
fireAllRules(), and retract it again. Showing in console is solved with
queries. At the end I'm calling the dispose()-method. I added it to see if
there is a change in behavior. But with or without it there is the same
problem with different results after few directly runnings.
Rules and queries are defined in a drl-file and loaded via
knowledgebuilder's add()-method. I am working with eclipse and of course the
plugin for it.
Could it be a problem with something memory like (in a way like a cache or
similar to the garbage collection)?
I hope with this short explanation you can give me a feedback. If not its
not problem to describe in a more detailed way.
Thank you.
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11 years, 4 months
Drools Courses
by Matteo Cusmai
Hi all,
i and my company are interested on some Drools+JBPM courses?
Are there any courses from Red Hat or other companies?
Best Regards,
Mattteo.
11 years, 4 months
drools grid or other high availability solution?
by Justin Case
Hello all,
I noticed there's not much fuss about drools-grid (anymore?). Is there something still going on there? Is it recommendable for something reliable?
Or if not, do you have any hints/links/experience on how to achieve a certain high availability level with DRools servers?
Many thanks,
JC
11 years, 4 months
DROOLs 'Guarded entry/block' tactics for Rules synchronization and ordinality?
by Cotton, Ben
Hi,
I have finally gained a tiny bit of control (and maybe even some competency) in using the DROOLs language operators 'no-loop' and 'lock-on-active' as a basis for controlling rule set firing behavior in response to Fact mutation events (during consequence processing).
I now want to (competently!) use DROOLs language tactics that give me ever finer grained control over managing rule set firing behavior on Fact mutation events. Specifically, I want to be able to implement some form of 'Guarded entry/block' controls.
E.g. let's say I have a Fact (InsertedFactPOJO) that I insert into the KS and want to have its 'fireAllRules()' AgendaSet(s) renedered in exact incremental ordinal stages and in perfect isolation. To do this, I am testing the inclusion of a 'countdownLatch' Semaphore reference as a Fact member (initialized to N=`total rule count` value). I then use this to 'Guard' individual rule entry, by generating an explicit predicate participant
(InsertedFactPOJO(countdownLatch == i) )
@ each ith Rule producedby my template.
Is this approach a valid/sound/complete way to implement 'Guarded entry/block' controls in DROOLs? Is there a better way?
As always, my sincerest gratitude to this community for its generosity (and its genius).
Ben
package com.ms.fast.triclear.eligibility.rules.drools_community.questions.posted;
import com.ms.fast.triclear.eligibility.InsertedFactPOJO;
//fact:(backed by Class 'InsertedFactPOJO' has
//- 'countdownLatch' (Semaphore) member
//- 'aList' (List)member
rule "RULE_ALL_RULES_HAVE_FIRED_ONCE_ORDINALLY"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 0)
then
System.out.format("\tALL RULES have fired *EXACTLY* once, *EXACTLY* ordinally. "+
" fact.countdownLatch=%d \n\t fact.aList=%s\n\n",
fact.countdownLatch,
fact.aList.toString());
end
rule "RULE_3"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 3)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value predicate match @RULE="+
"3"+" -- fact.countDownLatch=%d)\n", "Rule 3",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 3 pattern-match event added to POJO 'aList' field");
}
end
rule "RULE_2"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 2)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value predicate match @RULE="+
"2"+" -- fact.countDownLatch=%d)\n", "Rule 2",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 2 pattern-match event added to POJO 'aList' field");
}
end
rule "RULE_1"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 1)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value predicate match @RULE="+
"1"+" -- fact.countDownLatch=%d)\n", "Rule 1",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 1 pattern-match event added to POJO 'aList' field");
}
end
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton(a)ms.com<mailto:ben.cotton@ms.com>
________________________________
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11 years, 4 months
Drools Planner: Planning variable gets assigned value out of valueRange
by mr_moe
Hey,
I have a planning entity, which has one planning variable called startDate.
This variable has a defined discrete value range which is a list of numbers
of the type long. Every number represents a timestamp, which is in between
the number firstPossibleStartDate and lastPossibleStartDate.
During the planning process, the number 0 is sometimes assigned to the
planning variable which is definitely not part of the valueRange. I’ve
printed the list to the console, but all values in the list are fine.
Because every planning entity has its own valueRange, the range is defined
in the entity itself.
At the moment I’ve implemented my own mover, but the problem occurs also
with pre-configured mover.
During my research I’ve stumbled upon the following note in the Planner
Documentation:
ValueRange from planning entity is currently not yet supported by the new
MoveSelectors.
Does this has something to do with my problem?
Enclosed you will find the code of the planning entity.
@PlanningEntity
public class DroolTask {
private List<Long> startDateList;
private int id;
private String name;
private long duration;
private long firstPossibleStartDate;
private long lastPossibleStartDate;
private String nextTask = "";
private String previousTask = "";
// Planning variables: changes during planning, between score calculations.
private long startDate;
@PlanningVariable
@ValueRange(type = ValueRangeType.FROM_PLANNING_ENTITY_PROPERTY,
planningEntityProperty = "startDateList")
public long getStartDate(){
return startDate;
}
public void setStartDate(long startDate){
this.startDate = startDate;
}
public List<Long> getStartDateList(){
return this.startDateList;
}
public void setStartDateList(){
startDateList = getPossibleStartDate();
}
public List<Long> getPossibleStartDate(){
startDateList = new ArrayList<Long>();
for(long i = firstPossibleStartDate; i<=lastPossibleStartDate; i = i +
60){
startDateList.add(i);
}
return startDateList;
}
public Long getFirstPossibleStartDate(){
return firstPossibleStartDate;
}
public void setFirstPossibleStartDate(long firstPossibleStartDate){
this.firstPossibleStartDate = firstPossibleStartDate;
}
public Long getLastPossibleStartDate(){
return lastPossibleStartDate;
}
public void setLastPossibleStartDate(long lastPossibleEndDate){
this.lastPossibleStartDate = lastPossibleEndDate;
}
[...]
public DroolTask clone(){
DroolTask clone = new DroolTask();
clone.name = name;
clone.duration = duration;
clone.firstPossibleStartDate = firstPossibleStartDate;
clone.lastPossibleStartDate = lastPossibleStartDate;
clone.startDate = startDate;
clone.nextTask = nextTask;
clone.previousTask = previousTask;
clone.startDateList = startDateList;
return clone;
}
[...]
}
It would be great, if someone could give me a hint.
Many thanks,
Moe
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11 years, 4 months
