7:17 p.m.
hi ,
I am able to fire the rules in drools...But i want to fire the rules
after modification of same data
ie.., i want to fire the rules twice in the same session
for example: i have some stock of different items, if the particular stock
item quantity is less than minimum quantity i want fire a rule that order
that quantity
after that the stock is added to that previous count(stock), i want to
recheck the stock positions and again need to fire rules
is it possible to fire the rules twice or more in Drools
if, please provide me some sample code....
I want to know that Drools can fire a rule multiple times in one session or
not????
please let me know if possible and guide me in this scenario
thanks in advance
8:28 p.m.
hi sai,
AFAIK whenever you change/modify anything inside a FACT, the rule using the
FACT will get refired again.
Regards,
Abhinay
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8:34 p.m.
thank for your response sir
i have tried so many times but it is not firing more than one time
could you please help me with some sample code
so that i can modify my requirement
On Thu, Oct 11, 2012 at 4:58 PM, abhinay_agarwal <
abhinay_agarwal(a)infosys.com> wrote:
hi sai,
AFAIK whenever you change/modify anything inside a FACT, the rule using the
FACT will get refired again.
Regards,
Abhinay
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9 p.m.
If you want the same rule to fire again and again then just modify the fact
such that the WHEN condition is satisfied.
For example in the HELLO WORLD sample Code :
rule "Hello World"
no-loop
when
m : Message( status == Message.HELLO, myMessage : message )
then
System.out.println( myMessage );
m.setMessage( "Goodbye cruel world" );
m.setStatus( Message.GOODBYE );
update( m );
end
You can alter and change the m.setStatus( Message.HELLO) and you can see the
rule gets refired again.
But this will make the rule to refire itself again and again, making it fall
inside an infinite loop, which is logically not acceptable(For this reason
"no-loop" exists).
So my opinion would be modify your rule set to make few rules, such that
each of them satisfies under some condition and gets fired !!
Regards,
Abhinay
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4:18 p.m.
good morning sir,
first of all
i am very thankful to your support,
but it is not working properly, first of all i want to explain my
requirements
please pay little time for me
I have 1000 records of some data like sales amount
I have two rules like below
rule "Mr First Rule"
salience 100
when
#conditions
sales : Sales (salesAmount >=200)
then
#actions
sales.set SalesMessage("goodsales");
end
rule "My second Rule"
salience 80
when
#conditions
sales : Sales (salesAmount<200)
then
#actions
sales.set SalesMessage("badsales");
end
Here i want to insert facts from the list
if the salesAmount list is modified in the same session( fact object is
modified)
how can i fire the rules again in the same session
please help me in this scenario and if possible please provide some docs
also
regards
sai
On Thu, Oct 11, 2012 at 5:30 PM, abhinay_agarwal <
abhinay_agarwal(a)infosys.com> wrote:
If you want the same rule to fire again and again then just modify
the fact
such that the WHEN condition is satisfied.
For example in the HELLO WORLD sample Code :
rule "Hello World"
no-loop
when
m : Message( status == Message.HELLO, myMessage : message )
then
System.out.println( myMessage );
m.setMessage( "Goodbye cruel world" );
m.setStatus( Message.GOODBYE );
update( m );
end
You can alter and change the m.setStatus( Message.HELLO) and you can see
the
rule gets refired again.
But this will make the rule to refire itself again and again, making it
fall
inside an infinite loop, which is logically not acceptable(For this reason
"no-loop" exists).
So my opinion would be modify your rule set to make few rules, such that
each of them satisfies under some condition and gets fired !!
Regards,
Abhinay
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5:35 p.m.
Hey sai,
First of all make sure whether you will be having a list of "objects"
containing "salesAmount" or list of "salesAmount".
If you are having a list, then your list should also be present in the WHEN
condition, such that when the state of your list changes then the rule gets
fired !!
Regards,
Abhinay
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5:57 p.m.
let me clear this by following code
public static void main(String[] args){
KnowledgeBase knowledgeBase = createKnowledgeBase();
ArrayList<SalesAmount> testSalesAmounts= getSalesAmount();
StatefulKnowledgeSession session =
knowledgeBase.newStatefulKnowledgeSession();
for(SalesAmount eachSalesAmount: testSalesAmounts){
session.insert(eachSalesAmount);
session.fireAllRules();
}
}
public static ArrayList<SalesAmount> getTestSalesAmounts(){
ArrayList<SalesAmount> testSalesAmount = new ArrayList<SalesAmount>();
for(int i =0; i<15;i++){
Random random = new Random();
SalesAmount.testSalesAmount= new SalesAmount();
testSalesAmount.setId(i);
testSalesAmount.setSalesAmount(random.nextInt(500));
testSalesAmounts.add(testSalesAmount);
}
return testSalesAmounts;
}
SalesAmounts is assigned randomly using util class
and each fact is inserted at a time in the loop control
if after the loop , the data changes how can i fire the rules
please modify my code if any mistakes you find........
regards
sai
On Fri, Oct 12, 2012 at 2:05 PM, abhinay_agarwal <
abhinay_agarwal(a)infosys.com> wrote:
Hey sai,
First of all make sure whether you will be having a list of "objects"
containing "salesAmount" or list of "salesAmount".
If you are having a list, then your list should also be present in the WHEN
condition, such that when the state of your list changes then the rule gets
fired !!
Regards,
Abhinay
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12:20 a.m.
A rule like
when
sales : Sales (salesAmount >=200)
then
sales.setSalesMessage("goodsales");
end
will not trigger any new evaluation because the engine can't detect the
change. You'll need to make the engine aware of the change :
when
sales : Sales (salesAmount >=200)
then
modify (sales) { setSalesMessage("goodsales"); }
end
Notice that "modify" does NOT simply cause rules to re-fire. It causes a
reevaluation of the object which has been modified. Any rule with a pattern
that matches the new version of the object will become active gain. In your
case, since you do not have any constraints on the salesMessage, any
precondition that was holding before the set will be still holding and your
rule will LOOP. You will have to add a "salesMessage == null" condition in
the LHS, or mark the Sales class as @propertyReactive.
I would also like to understand your requirement of "firing rules TWICE"..
do you need to evaluate your fact both before and after setting the message?
(the salesamount would be unchanged)
Davide
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3 p.m.
Good morning sir,
thanks to your earlier suggestions
i want to know that, can we retrieve the facts from database(or) URL
source??
if so, can we pass that facts to DRL source (which is also a url source)
and make them fire...
please help me , how to get the facts from database and remote url
for ex: as my earlier example, SalesAmount and sales data(facts) are at
some remote url site...
if i want to get those facts to my java application to be fired through drl
file , what should i do?
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*SAI BABA NADH*
+91 7411680125
* *
9:45 p.m.
I think what you need is the modify() statement as defined here:
http://docs.jboss.org/drools/release/5.5.0.Beta1/drools-expert-docs/html/...
When changing a fact within a modify() you trigger a reevaluation of the
fact ,which can lead to rules firing again if they fit the modified object.
Be sure to have a fitting abort condition or you may enter an endless loop.
kind regards
Lukas
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participants (4)
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LStampf -
Sai Nadh