Rule "rule_suspiciousTransactionInDifferentsPOSOfSameCustomer" in
combination with many POS and many Customer facts is an anti-pattern. The
rule starts looking for POS facts: you insert plenty. Then, it looks for
Customers: you insert a bundle. And so it combines the first POS with all
Customers, the second POS with all Customers,... and so on, and on and on.
Start with an Event, match another Event close to the first one, and *then
pull in the suspects. *(The other way round isn't popular in real life
either ;-) )
Cheers
-W
2012/3/29 Luciano Molinari <lucmolinari(a)gmail.com>
Hi guys,
I'm trying drools-fusion's cep capabilities but I'm having some troubles
on loading the data to the Working Memory. I have three types defined in
the DRL File: Customer, POS (Point of sale) and Transaction (event). I have
a rule to discover suspicious transactions (customers that have made two
transactions in ten seconds and from diferents POS).
Besides, I have other 3 helper rules that receive the fact (Customer or
POS) or the event (Transaction) in JSON format, convert it and store it in
the session (Customer or POS) or forward the event to another entry-point.
My drools file:
global org.codehaus.jackson.map.ObjectMapper jsonConverter;
declare Event
@role(event)
id : String
logicNumber : String
customer : String
end
declare POS
logicNumber : String
end
declare Customer
id : String
end
rule "rule_convertAndInsertPOS"
when
$json : String() from entry-point convertAndInsertPOS
then
POS pos = jsonConverter.readValue($json, POS.class);
retract($json);
insert(pos);
end
rule "rule_convertAndInsertCustomer"
when
$json : String() from entry-point convertAndInsertCustomer
then
Customer customer = jsonConverter.readValue($json, Customer.class);
retract($json);
insert(customer);
end
rule "rule_convertAndSendEvent"
when
$json : String() from entry-point convertAndSendTransaction
then
Event evt = jsonConverter.readValue($json, Event.class);
System.out.println("Repassando evento " + evt);
entryPoints["StreamTransactions"].insert(evt);
retract($json);
end
rule "rule_suspiciousTransactionInDifferentsPOSOfSameCustomer"
dialect "mvel"
when
$pos : POS($posNumber : logicNumber)
$customer : Customer($idCustomer : id)
$trans1 : Event(logicNumber == $posNumber, customer ==
$idCustomer) from entry-point StreamTransactions
$trans2 : Event(logicNumber != $posNumber, customer ==
$idCustomer, this after[0, 10s] $trans1) from entry-point StreamTransactions
then
System.out.println("Suspect fraud between the transactions " + $
trans1.id + " and " + $trans2.id);
end
In my test case, before starting sending events to the entry-point
"convertAndSendTransaction", I try to load some POS and Customers.
private void loadPOS() {
WorkingMemoryEntryPoint entryPointConvertAndInsertPOS = kSession
.getWorkingMemoryEntryPoint("convertAndInsertPOS");
log("Loading POS");
for (int i = 1; i <= 20000; i++) {
if ((i % 1000) == 0) {
log("Inserting POST " + i);
kSession.fireAllRules();
}
entryPointConvertAndInsertPOS.insert(getPOSInJson("POS" + i));
}
kSession.fireAllRules();
log("POS loaded");
}
private void loadCustomer() {
WorkingMemoryEntryPoint entryPointConvertAndInsertCustomer =
kSession
.getWorkingMemoryEntryPoint("convertAndInsertCustomer");
for (int i = 1; i <= 10000; i++) {
if ((i % 1000) == 0) {
log("Inserting customer " + i);
kSession.fireAllRules();
}
entryPointConvertAndInsertCustomer.insert(getCustomerInJson(String.valueOf(i)));
}
kSession.fireAllRules();
log("Customers loadaed");
}
No matter if I call loadPOS() or loadCustomer() first, the first one I
call is executed correctly, but when I call the second one it stops on
fireAllRules() and the memory increases untill OME.If I remove the rule
"rule_suspiciousTransactionInDifferentsPOSOfSameCustomer" from the DRL
file, both the loading executes correctly. It seems that the when the data
is inserted into the session, the begin of this rule is being executed or
something like that.
How can I solve this issue?Is there any way of just executing the rules of
loading data at this moment?Is there a better way to achieve what I'm
trying?
The full project (maven) is attached to this email.
Thanks and sorry for the English.
--
Luciano Davoglio Molinari
http://lucianomolinari.wordpress.com/
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