Hi folks!
I’m having some trouble to understand activations.
My system receives transactions and I want to detect periods of
time without transactions. If I don’t have transactions for an hour, I
want to sound an alarm.
I’ve
wrote the following rules just to see how Drools works (I’ve tried
sliding windows also but without success):
declare
NoTransactions
@role(
event )
timestamp:
long
end
declare
EngineStart
@role(
event )
timestamp:
long
end
declare Transaction
@role(
event )
@expires(
1h )
end
rule "***start***"
when
not(
EngineStart() )
then
insert( new
EngineStart() );
System.out.println(“engine
started”);
end
rule "***notrx_after_start***"
when
$engineStart
: EngineStart()
not(
NoTransactions() )
not(Transaction(
this after [0s, 1h] $engineStart ) )
then
insert ( new
NoTransactions() );
System.out.println(“no
transactions for an hour since engine started”);
end
rule "***notrx_after_trx***"
when
EngineStart()
not(
NoTransactions() )
$transaction
: Transaction()
not( Transaction(
this != $transaction, this after [0s,
1h] $transaction ) )
then
insert( new
NoTransactions() );
System.out.println("no
transactions for an hour since last transaction ");
End
·
First rule inserts an Event
when rule engine starts
·
Second rule detects absence
of transactions since engine started
·
Third rule detects absence of
transactions since last transaction
The testcase is simple (using pseudoclock):
·
00h00m: rule engine start
·
00h30m: insert a transaction
·
01h01m: notification of
absence of transactions since engine started (not the desired behavior)
I’ve attached the logs and I can’t understand how an
Activation is cancelled and executed afterwards (without any creation).
Thanks for the time spent to read this email! J
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Vítor Mendonça Moreira |
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